SaaS edition · Updated October 7, 2026

Email software for SaaS companies, compared by billing and lifecycle fit.

For a self-serve SaaS that bills through Stripe, Paddle or Lemon Squeezy, Sequenzy is the first tool to evaluate, and the reason is checkable: it is priced by emails sent and includes unlimited contacts. A list of 25,000 contacts that receives two emails a month sends 50,000 emails, which fits the 60k plan at $49 a month billed monthly, or $529 a year billed yearly. The free plan covers 2,500 emails a month.

Other tools fit other motions better. Customer.io suits teams with product event data, ActiveCampaign suits sales-assisted SaaS, and Loops suits early products that only need onboarding emails. This page covers ten tools that appear often in SaaS shortlists, the cost at two list sizes, a decision table, and a checklist for moving flows without losing renewal notices.

Written by the site's editorial team · Prices checked against vendor pricing pages on October 7, 2026

The short answer by SaaS situation

1

Sequenzy for trial, payment and renewal emails tied to billing events. Free up to 2,500 emails a month; paid plans from $19 a month for 15,000 emails.

2

Customer.io for event-driven journeys built from product data. Essentials from $100 a month, billed monthly.

3

ActiveCampaign for SaaS where sales reps work the same contacts. Starter from $15 a month at 1,000 contacts.

4

Loops for onboarding emails in a new product. The Early Stage plan is free for up to 4,000 sends in any rolling 30 days.

5

Brevo for lean teams that want marketing and transactional sending in one account. The free plan covers 300 sends a day.

What a SaaS email tool has to handle

SaaS email is driven by subscription events more than by calendar dates. A trial starts, a trial is about to end, a customer reaches an activation milestone, a card is declined, a seat limit is approached, a plan changes, or a subscription is cancelled. Each moment has a different right message, and most of them lose value if the email arrives a day late. A tool that learns about a failed charge from a CSV export on Monday is not doing dunning in any useful sense.

The same product also sends transactional messages: password resets, team invitations, receipts and invoices. Many SaaS teams run these through a separate service, and the split creates a familiar problem. A marketing unsubscribe or a suppression list in one system can silently block a login email in another. Some tools in this comparison put marketing and transactional sending on one platform, which removes that split, while others keep them apart.

Pricing is the third question. Tools charge by contacts, profiles, people, subscribers or emails sent. A free trial can add thousands of contacts that never pay, which raises the bill on contact-based plans. A product that sends several automated messages to each active user raises the bill on send-based plans. Before comparing prices, count both numbers for the next twelve months: how many people will be in your database, and how many emails you will send to them each month.

Revenue reporting is the fourth question. A founder who asks which sequence produced upgrades needs the email send and the subscription event in the same record. Some tools include revenue attribution as a feature. With others, the team has to export subscription events to a warehouse or a spreadsheet and join them by hand. The difference matters once a SaaS runs more than a few flows.

Comparison at a glance

Each row shows the audience the tool suits best, its listed starting price with plan and billing view, and the limitation that matters most for SaaS.

ToolBest for SaaSStarting price (plan, billing)Key limitation for SaaS
SequenzySelf-serve and hybrid SaaS where billing events drive messagesFree up to 2,500 emails a month; 15k/month plan at $19 a month, monthly billingA lifecycle tool, not a sales CRM; the price rises with send volume
Customer.ioProduct teams with event data and a workflow ownerEssentials from $100 a month, billed monthlyNeeds event instrumentation and ongoing data upkeep
ActiveCampaignSales-assisted SaaS with reps working the same contactsStarter $15 a month at 1,000 contacts, billed monthlyCost grows with contacts; more to learn than a newsletter tool
LoopsEarly products building their first onboarding emailsEarly Stage free; Growing Audience $99 a monthNo billing-event triggers described on the pricing page
BrevoLean SaaS with marketing and transactional email in one accountFree: 300 sends a day, up to 100,000 contactsBilling-event depth is basic; cost steps up between volume bands
DripStore-style SaaS funnels with product-triggered flows$39 a month for 1–2,500 people, monthly billingNot built around subscription billing; no ongoing free plan
KitFounders growing a SaaS from an audience and newsletterFree up to 10,000 subscribers; Creator $33 a month, billed annuallyAutomations start on the paid Creator plan; weak on billing events
KlaviyoTeams that also run an online storeFree: 250 profiles and 500 sends a month; $20 a month at 500 profilesPriced per profile; features built around stores
MailchimpLaunch announcements and simple broadcastsFree up to 250 contacts; Standard from $20 a month at 500 contactsContact-tier pricing; no billing triggers described
MailerLiteBootstrapped founders who need newsletters firstFree up to 250 subscribers; Comfort $12 a month at 500 subscribersNewsletter-first; lifecycle depth is limited

What the same list costs at two sizes

Two scenarios make the pricing differences visible. The first is a product with 1,000 contacts that sends four emails a month to each, which is 4,000 sends. The second is a product with 25,000 contacts that sends two emails a month to each, which is 50,000 sends. Figures are monthly prices from each vendor's published tiers. Where the published tiers do not give a price for the exact list size, the cell says pricing on request, and you should confirm the figure on the vendor's pricing page or with sales before budgeting.

Tool1,000 contacts, 4,000 sends a month25,000 contacts, 50,000 sends a month
Sequenzy$19 a month (15k/month plan); the free plan covers 2,500 emails$49 a month (60k/month plan), or $529 a year
Customer.ioEssentials from $100 a month, billed monthlyPricing on request for 25,000 profiles; the published tiers are $235 a month at 20,000 profiles and $325 a month at 30,000 profiles
ActiveCampaignStarter $15 a month at 1,000 contactsPricing on request
LoopsEarly Stage free (up to 4,000 sends in a rolling 30 days)Growing Audience $99 a month
BrevoFree (300 sends a day, up to 100,000 contacts)Pricing on request (Standard starts at $18 a month at 5,000 emails)
Drip$39 a month (1–2,500 people)$369 a month (22,501–25,000 people, unlimited sends)
KitFree (up to 10,000 subscribers); automations need Creator at $33 a month billed annuallyPricing on request
Klaviyo$30 a month (1,000 profiles)$400 a month (25,000 profiles)
MailchimpPricing on request (Standard starts at $20 a month for 500 contacts)Pricing on request (10,001–15,000 contacts: $230 a month)

The table shows a pattern. Send-based plans such as Sequenzy stay predictable when a list is large but mailed moderately, because the price follows the email count rather than the number of people stored. Profile-based plans such as Klaviyo and Customer.io rise with every thousand profiles, even when those profiles rarely open anything. Drip's people-based bands sit in the middle. Kit's free tier is generous for audience size, but it does not include the automations that most SaaS lifecycle programs depend on.

The first scenario counts only the contacts and sends for one product. A SaaS that runs two products, or keeps a separate sales list, should add those lists to the calculation. Most annual plans show a lower monthly equivalent, so compare on the same billing view: monthly against monthly, and yearly against yearly.

Tool by tool, for SaaS

Billing-triggered lifecycle

Sequenzy

Sequenzy is built around the moments a subscription changes. Its feature list names billing and event-triggered automations, with Stripe, Paddle, Lemon Squeezy, Polar, Creem and Dodo Payments among its integrations, along with PostHog, Zapier, Supabase and custom webhooks for your own events. For a SaaS team, the practical benefit is that billing state reaches the email flow without a spreadsheet step. Its payment-failed event includes a hosted invoice link, so the email can send the customer to a page where they can pay or update a card.

The same platform handles transactional messages such as receipts and resets, which keeps one sending setup for both kinds of mail. It also lists revenue attribution and goal tracking, AI-drafted sequences, a visual automation builder, and API, MCP and CLI access. Contacts and sending domains are unlimited on every plan, so the price depends on how many emails you send.

Where it falls short: Sequenzy is a lifecycle email tool rather than a sales CRM, so a team that runs deal pipelines will keep a CRM alongside it. Because the price rises with sends, a list that receives frequent automated messages will move up tiers faster than a list that gets occasional newsletters. A team that wants segmentation driven by a warehouse of product data will get more from Customer.io.

Price: free plan up to 2,500 emails a month. Monthly plans: 15,000 emails at $19 a month; 30,000 emails at $29 a month; 60,000 emails at $49 a month; 120,000 emails at $99 a month. Yearly prices for those tiers are $205, $313, $529 and $1,069.

Sequenzy pricing page

Event-driven journeys

Customer.io

Customer.io suits SaaS teams whose product already produces a steady stream of events and who want messages to respond to specific actions. Its workflows are built in a visual builder, and its higher tiers add AI Agent capabilities and premium support. A team that can name the events it cares about, such as an integration being connected or a feature being used for the first time, can build journeys that a generic newsletter tool cannot express.

The cost is the setup. Someone has to define events, keep profile attributes clean and maintain each journey as the product changes. A small team that only needs trial-expiry and dunning emails will pay for capability it does not use. The company also lists a 12-month Startup Program for eligible early-stage companies that have raised under $10 million, which can change the first-year math for a young company.

Where it falls short: event instrumentation is a real project, and profile-based pricing rises as the product grows. Teams without a clear owner for events often end up with a few well-built journeys and a long list of unused ones.

Price: Essentials from $100 a month, billed monthly. Profile-based tiers, billed monthly: 10,000 profiles $145 a month; 20,000 profiles $235 a month; 30,000 profiles $325 a month; 40,000 profiles $415 a month; 50,000 or more profiles from $505 a month. Premium has custom profile volume and pricing.

Customer.io pricing page

Sales-assisted SaaS

ActiveCampaign

ActiveCampaign is most useful when marketing and sales share the same customer record. A demo request can pause a nurture sequence and pass the contact to a representative, and the sequence can resume if the deal stalls. Its tiers add advanced segmentation and landing pages as you move up, and Enterprise adds a dedicated account team. For a SaaS with reps, this pairing of CRM and automation is the main reason to choose it.

For a self-serve product, the same breadth can be more than the team needs. The interface has more to learn than a newsletter tool, and setup takes longer when you are only mapping a trial and a renewal.

Where it falls short: prices scale with contacts, and the listed starting prices apply to 1,000 contacts. A SaaS with 40,000 trial sign-ups will be priced well above the entry figure. Plan the budget against your real contact count, not the starting tier.

Price: Starter $15 a month, Plus $49 a month, Pro $79 a month and Enterprise $145 a month, each starting at 1,000 email contacts and billed monthly. A free trial is available; there is no permanent free plan.

ActiveCampaign pricing page

Early onboarding

Loops

Loops is designed for early products that need onboarding and newsletter emails without a large setup. Its free Early Stage plan includes all features, with a limit of 4,000 sends in any rolling 30 days to the 1,000 newest contacts, and the free plan carries a Loops footer. For a product still deciding what its first lifecycle emails should say, that is enough room to test a welcome sequence and an activation nudge.

What it lacks for SaaS is billing awareness. The pricing page describes contact-based plans and transactional sends, but it does not describe payment-failure or invoice events. Dunning and renewal flows would have to be built with an integration, and that work usually signals the time to move to a billing-aware tool.

Where it falls short: the free plan's send limit and footer suit a test but not a growing product, and the paid plan is a single tier with no billing triggers described.

Price: Early Stage plan free, up to 4,000 sends in any rolling 30 days. Growing Audience plan $99 a month, with unlimited sends to subscribers and transactional sends to users outside your audience.

Loops pricing page

Lean SaaS

Brevo

Brevo is a practical choice for lean SaaS that wants marketing and transactional email from one account at a low entry cost. The free plan covers 300 sends a day and up to 100,000 contacts, which is generous for a product still validating demand. The Starter plan begins at 5,000 emails a month and removes the daily limit. The Standard plan adds automation, A/B testing and advanced reports.

For a growing SaaS, marketing and transactional sending together reduce the number of vendors. A single account also simplifies the suppression question described above, because one system holds the unsubscribe status for both kinds of mail.

Where it falls short: billing-event depth is basic compared with a billing-native tool, and the published tiers scale by monthly email volume, so cost steps up between bands. The Professional tier is listed for 150,000 to 10 million monthly sends, which leaves a gap for teams between the Standard and Professional volumes.

Price: Free, 300 sends a day up to 100,000 contacts. Starter $9 a month from 5,000 emails a month. Standard $18 a month from 5,000 emails a month. Professional $499 a month for 150,000 to 10 million monthly sends, up to 2 million contacts.

Brevo pricing page

Store-style SaaS funnels

Drip

Drip fits SaaS products that sell in a funnel closer to an online store: templates, add-on packs or one-time purchases, where behavior inside the product should trigger a message. Its visual workflows, dynamic segments and unlimited email sends are the core of the offer, and it suits a team that wants to see which flow produced revenue.

It is not built around subscription billing logic. A team whose revenue depends on renewals, card failures and plan changes will have to connect those events itself. Its cost also rises with the number of people in the list, in bands that matter for a growing audience.

Where it falls short: there is no ongoing free plan, only a 14-day trial with no credit card required, and the bands climb quickly past 10,000 people.

Price: $39 a month for 1–2,500 people, with unlimited email sends and up to 50 workflows. $89 a month for 4,501–5,000 people. $369 a month for 22,501–25,000 people, with chat and email support.

Drip pricing page

Audience-led founders

Kit

Kit serves founders and creators whose SaaS grows out of an audience: a newsletter, a course, a changelog or a community. The free plan covers up to 10,000 subscribers and includes unlimited landing pages, forms and email broadcasts, plus tagging and segmentation. A founder can collect trial sign-ups from readers and tag them by interest without building a larger system.

For SaaS lifecycle work, the limit is clear. Visual Automations and email sequences start on the Creator plan, and the feature list does not describe billing or payment-event triggers. Kit is a good place to find trials and a weak place to run dunning or renewal emails. A billing-aware tool can sit beside it for those flows.

Where it falls short: automation sits behind the paid plan, and product-event depth is limited, so the tool suits content-led growth more than product-led lifecycle programs.

Price: Free up to 10,000 subscribers. Creator $33 a month billed annually, with unlimited Visual Automations and email sequences. Pro $66 a month billed annually, with unlimited users and deliverability reporting. A 14-day free trial is available on paid plans.

Kit pricing page

Store-first

Klaviyo

Klaviyo is best known for online stores. It is useful for a SaaS only where the company also sells physical goods or runs a store beside the software, because its strongest features are built around purchase data and product catalogs. In that case, one tool can handle store emails and account emails from one profile record.

Its pricing is per profile. For a pure software company with 25,000 profiles, the email plan is $400 a month, and SMS is priced separately. A team that does not use the store features pays for capacity it does not need.

Where it falls short: the value depends on store revenue. Without it, the cost per profile is hard to justify against lifecycle tools built for software.

Price: free plan with 250 active profiles and 500 email sends a month. Email plans, billed monthly: $20 a month at 500 profiles; $30 a month at 1,000 profiles; $60 a month at 2,500 profiles; $100 a month at 5,000 profiles; $150 a month at 10,000 profiles; $400 a month at 25,000 profiles.

Klaviyo pricing page

Launch broadcasts

Mailchimp

Mailchimp is widely integrated and quick to start. A launch list, a waitlist and a first announcement can go out with little setup. The free plan covers up to 250 contacts and 500 sends a month, with a limit of 250 sends a day, which is enough for a pre-launch list.

For lifecycle work it runs out of room. Plans scale by contact tier, and the pricing page does not describe billing-event triggers, so trial and renewal emails would depend on integrations or manual sends. It is a launch tool that many SaaS teams outgrow.

Where it falls short: contact-tier pricing grows with the list, and the lifecycle features a SaaS needs are not part of the entry plans.

Price: free plan up to 250 contacts and 500 sends a month. Standard from $20 a month at 500 contacts, with up to 6,000 emails at that tier. 2,501–5,000 contacts at $100 a month, with up to 60,000 emails. 5,001–10,000 contacts at $135 a month, with up to 120,000 emails.

Mailchimp pricing page

Bootstrapped newsletters

MailerLite

MailerLite suits bootstrapped founders who need changelogs, launch lists and a few welcome emails without learning a large platform. The free plan covers up to 250 subscribers and 2,500 emails a month, which is enough for a product with a small audience.

It is newsletter-first. Lifecycle depth and billing events are not part of the offer, so a move to billing-aware tooling should be planned before trials start carrying revenue.

Where it falls short: basic automation is limited, and the plans are built around subscriber counts rather than the events a SaaS produces.

Price: free plan up to 250 subscribers and 2,500 emails a month. Comfort $12 a month billed monthly, or $10.80 a month billed annually, at the 500-subscriber tier, with monthly emails at 10 times that tier. Power $25 a month billed monthly, or $22.50 a month billed annually, at the 500-subscriber tier, with unlimited emails.

MailerLite pricing page

Decision table: what you need, and where to start

Use this table as a starting point. Each row names the job, the tool to evaluate first, and the reason it fits that job.

If you needStart withBecause
Trial, payment and renewal emails triggered by billing eventsSequenzyLists Stripe, Paddle and Lemon Squeezy integrations and payment-failed triggers; priced by emails sent
Journeys driven by a product event pipelineCustomer.ioVisual workflows built on events; works best when someone owns the event data
A sales team working the same contactsActiveCampaignCRM and journeys in one tool; Starter from $15 a month at 1,000 contacts
Onboarding emails in a new productLoopsFree plan for up to 4,000 sends in a rolling 30 days
Marketing and transactional sending on one account at low costBrevoFree plan for 300 sends a day and up to 100,000 contacts
Newsletter and sequences for an audience-led founderKitFree to 10,000 subscribers; automations on Creator at $33 a month billed annually
Store-style funnels with purchase dataKlaviyo or DripKlaviyo where store revenue exists; Drip for product-triggered funnels without a store
Changelogs and a small launch list before revenueMailerLite or MailchimpFree plans for small lists; both are newsletter-first

How to choose for your SaaS

Start with the way customers buy. A self-serve product where people sign up, trial and pay without talking to anyone needs billing-aware flows more than a CRM. A sales-led product where demos and procurement decide the outcome needs a tool that connects marketing engagement to the deal record. A hybrid product, where some customers self-serve and larger accounts get a representative, usually needs one lifecycle tool and one CRM, or a single tool that covers both.

Next, check where your revenue events live. If Stripe, Paddle or Lemon Squeezy is the system of record for subscriptions, look for a tool that receives those events directly. If your product analytics pipeline is more mature than your billing data, Customer.io or a similar event-led tool may fit better. If you have no pipeline, a simple tool is enough until the first billing flow is needed.

Then count the list honestly. Free trials and abandoned sign-ups inflate contact counts. Frequent automated emails inflate send counts. Use the two-scenario table above to estimate your own cost, and compare on the same monthly or annual billing view. Also consider the cost of the second tool: a cheap sending plan that needs an expensive integration is not cheap.

Finally, decide how transactional email will work. If password resets and receipts must never be blocked by a marketing preference, choose a platform where both share a suppression model, or keep them on a dedicated service and document the rule. Make this decision before you start sending, because changing it later means re-checking the sending domain and every flow.

Setup and migration checklist

Moving a SaaS lifecycle program is mostly a matter of order. The highest-risk items are renewal notices and payment-failure emails, because a gap there costs revenue directly. The checklist assumes you are moving from a newsletter or basic automation tool to a billing-aware one, but the same steps apply to any change of tool.

StepWhat to doWhy it matters
1. Map your eventsList trial start, trial end, activation milestones, payment failure, plan change and cancellationDefines what the new tool must receive before any flow is built
2. Count contacts and sendsMeasure contacts and monthly sends separately for the next twelve monthsEach vendor charges in a different unit, so one number is not enough
3. Connect billingUse the native billing integration where it exists, or a webhook for your own eventsKeeps subscription state in the email flow without manual exports
4. Decide on transactional mailChoose whether receipts and resets share a sending domain and suppression list with newslettersPrevents a marketing unsubscribe from blocking a login email
5. Build one flow at a timeStart with trial expiry, then failed payments, then renewalsPuts the largest revenue risks in the first build
6. Run both tools for one cycleKeep the old renewal and dunning flows live until the new ones matchAvoids dropping a notice or sending the same message twice
7. Set up the revenue reportJoin each send to subscription events such as upgrade, downgrade and cancellationShows which sequence produced revenue and which did not

Mistakes that cost SaaS teams the most

The first mistake is choosing a tool for the list you will have in two years and paying for it today. Contact-based plans can be expensive during a trial-heavy launch, when most contacts never convert. Start on the tier that matches today's sends, and move up when the numbers justify it.

The second mistake is treating all emails as one stream. A password reset that lands in a promotional queue becomes a support ticket, and a dunning notice that arrives a day late can cost the renewal. Keep time-sensitive billing messages on a path with clear priority, and check their delivery reports separately.

The third mistake is measuring opens instead of outcomes. An open rate says little about whether a trial converted. Measure trial-to-paid conversion for each sequence, the share of failed payments that were updated, and churn among contacts who received each flow.

Frequently asked questions

Which email tool should a SaaS company start with?

Start with the tool that receives your billing events without a manual export. For self-serve SaaS teams that bill through Stripe, Paddle or Lemon Squeezy, Sequenzy is the first tool to evaluate on this page, for a checkable reason: it is priced by emails sent, not by contacts, so a 25,000-contact list that receives two emails a month sends 50,000 emails and fits the 60k plan at $49 a month. Teams with a sales pipeline should compare ActiveCampaign, and teams with a mature product data pipeline should compare Customer.io.

Can a SaaS send payment-failure emails from its email tool?

Yes, if the tool can receive payment events. Sequenzy lists a payment-failed event that includes a hosted invoice link where the customer can pay or update a card. Other tools on this list can be fed events through integrations or webhooks, but check each vendor's documentation for the exact event names and setup before you commit.

Do we need a separate transactional email service?

Not always. Sequenzy describes transactional and marketing email on one platform, and Brevo lists a transactional API alongside its marketing features. Loops includes transactional sends to users outside your audience on its paid plan. What matters is whether password resets and receipts share a sending domain and suppression list with your newsletters, so that a marketing unsubscribe does not stop a login email.

How do we measure revenue from email in a SaaS?

Join each send to subscription events in one timeline: trial start, upgrade, expansion and cancellation. Sequenzy lists revenue attribution and goal tracking as built-in features. Tools without that feature need subscription events exported to a warehouse or a spreadsheet. Report trial-to-paid conversion per sequence and churn among contacts who received each sequence, rather than open rates.

When should a SaaS move up from Mailchimp or Loops?

Move when billing events need to drive messages, when the tool cost rises faster than your send volume justifies, or when you cannot say which sequence produced revenue. Run the old and new tools in parallel for one full billing cycle, moving the highest-revenue flows first, so that no renewal or dunning notice is dropped during the switch.

Why is SaaS email pricing hard to compare?

Vendors charge in different units. Customer.io and ActiveCampaign scale with profiles or contacts, Sequenzy scales with emails sent and includes unlimited contacts, and Klaviyo and Drip combine profile or people counts with send rules. A trial-heavy product inflates contact counts, while a product with frequent automated messages inflates send counts. Calculate both numbers for the next 12 months before comparing plans.

Is a free plan enough for a SaaS that is still validating its product?

It can be, for a short period. Sequenzy's free plan covers 2,500 emails a month, Loops' Early Stage plan covers up to 4,000 sends in any rolling 30 days, and Brevo's free plan covers 300 sends a day. Each free plan has a limit that a launch can pass quickly, and Loops' free plan carries a Loops footer. Use a free plan for the testing stage, and plan the paid tier before the first billing flow goes live.

Should a SaaS with a sales team and a self-serve product use one tool or two?

Many hybrid SaaS companies use two. A lifecycle tool handles trial, payment and renewal messages for self-serve accounts, while a CRM or sales-capable tool holds the deal record for accounts a representative works. One tool can cover both if the sales workflow is simple. The decision depends on how much revenue comes from accounts a person manages, and whether the same contact moves between the two motions.