Best Email Sequence Tools for SaaS Welcome Sequences

For a SaaS with one to five people and an engineer who can spare a day, the best tool for welcome sequences is Loops. Its own guide tells you to send the welcome as a workflow triggered when a contact is added and to keep verification and password resets on a separate transactional route, which is the split most small teams get wrong. The free plan allows 4,000 sends in any rolling 30 days to the 1,000 newest contacts, its paid plan reads $48 a month at 4,788 subscribers, and there are no seat fees. This page covers the first three to five emails after signup or trial start, who sends each one, and the ways a welcome gets sent twice or not at all. Each price is taken from the vendor page linked with it, dated 7 October 2026.

The audience is a product with 50 to 2,000 signups a month, login handled by an auth provider or your own code, and nobody whose job title is "lifecycle marketer". If your product already has a deliberate activation path, read the customer onboarding page next, because the welcome here is only the opening of it. The general writing advice sits in welcome sequence best practices; this page is about tools and wiring.

Which tool for which small-team situation

Sort every signup email into transactional or marketing first

The decision that prevents most double sends is made before you open any tool. Loops' guide on transactional versus marketing email defines a transactional message as one triggered by a specific user action, expected by that user, and containing only content relevant to that action. Workflows and campaigns are marketing. The guide's table lists what changes: marketing sends carry an unsubscribe link and track opens and clicks, honour a contact marked unsubscribed, and can start a "contact added" workflow; transactional sends carry no unsubscribe link, are not tracked, still send to someone marked unsubscribed, and never start a "contact added" workflow.

The Stripe line is a documented source of duplicates. Stripe's customer emails page describes a trial-ending reminder under "Send a reminder email 7 days before a free trial ends", and a separate subscription event, customer.subscription.trial_will_end, that its webhook documentation says is sent three days before the trial ends. The email and the event are different things on different days. Decide which one your product uses before a trial email appears twice.

Four ways a welcome goes out twice, or not at all

1. The app and the tool both say welcome. The app sends "Welcome to the product!" from its own code when the account is created, and the marketing workflow also fires. Delete one. The marketing workflow wins, because it respects unsubscribes and can be edited without a deploy.
2. The signup never becomes a contact. Loops' guide says a transactional send to a new address does not add the address to your audience unless addToAudience is set, and does not trigger the "contact added" workflow. If the verification mail is the only call your signup makes, nobody gets a welcome. Create the contact explicitly, through a form, the API or an integration, as the workflows page requires; contacts added by hand in the audience table do not trigger it.
3. An import wakes the workflow. The workflows page says imported contacts start workflows only if the "trigger workflows" toggle is selected during upload. Leave it off when you import your existing users, or every one of them gets "welcome" on the same morning.
4. A free plan quietly stops. MailerLite's pricing FAQ says that when a free account passes its 250-subscriber limit, sending is locked for campaigns and automations, and the account is prompted to upgrade or remove subscribers. The 251st signup does not get a welcome and nothing visibly fails.

The seven tools, ranked for a small-team welcome sequence

1. Loops: the only tool here whose docs tell you how to split welcome from transactional

Loops' workflow documentation lists four triggers (contact added, contact updated, contact added to a list, event received) and describes a workflow as "an email sequence that can be triggered by different events". The six node types are trigger, email, timer, audience filter, branch and experiment, with unlimited emails per workflow. The onboarding guide recommends starting with a welcome workflow and the transactional emails that account confirmation, login verification and password resets need, restricting the workflow with a filter on a tag or property, and clicking Start to activate it. It suggests waiting two or three days before the first campaign, which also warms a new sending domain.

Loops' pricing page shows the free Early Stage plan with all features, a small "Powered by Loops" footer and up to 4,000 sends in any rolling 30 days to the 1,000 newest contacts. The Growing Audience plan reads $48 a month at 4,788 subscribers, $99 at 9,998, $198 at 24,339 and $249 at 49,989, with transactional sends included on paid plans and no seat charges. For tests, the events page says that addresses at example.com and test.com fire events normally but receive no email.

Choose it if you want the documented pattern and a free start. Skip it if you need a goal or exit node: the node list has none, so stopping the sequence for someone who finished the first task means a property update and an audience filter.

2. MailerLite: easiest editor when signup is a form

MailerLite's pricing page lists the free plan at up to 250 subscribers, two user seats and 2,500 emails a month, with three active automations and five automation steps. Comfort has 50 automations and 100 steps, and Power has unlimited automations; the FAQ puts multiple automation triggers in Power. If every email and every delay counts as one step, which the page does not state, the free plan's five steps hold three emails and two delays, short of a five-email welcome. Comfort starts at $12 a month for 500 subscribers ($10.80 billed yearly), with $19 at 1,000, $49 at 5,000 and $89 at 10,000; Power starts at $25 ($22.50 yearly), with $39, $69 and $129 at the same sizes. Comfort gives ten times the subscriber tier's ceiling in monthly emails. The page says its data storage centre is in the European Union with an ISO 27001 certificate, and for transactional email it points to MailerSend rather than offering it in the same plan.

Choose it if signups come from a form or landing page and the welcome is plain email. Skip it if the verification mail and the welcome need to come from one account, because that means a second product.

3. Brevo: transactional and marketing in one free account

Brevo's pricing-plans help page lists the Free plan with 300 email sends a day, storage for up to 100,000 contacts, one user seat, transactional email and SMS, multi-channel marketing automation for up to 2,000 contacts, and outbound webhooks. Starter begins at $9 a month with no daily sending limit, at 5,000 sends and up to 500 contacts; Standard begins at $18 and lists marketing automation for unlimited contacts, A/B testing and one landing page. The page does not say whether transactional sends count toward the free plan's 300 a day, so ask support or test it before you send verification and welcome mail from the same account. Removing the Brevo logo is an add-on, listed at $9 a month on the help page and $10.80 on the pricing page.

Choose it if you want both kinds of email in one free account and expect fewer than 300 sends a day. Skip it if a launch could send hundreds of first emails in one day.

4. Resend: for teams whose engineers already own the app's email

Resend's automations documentation lists "welcome emails" among typical uses and describes steps that send an email, delay, wait for an event or branch on a condition. The pricing page shows the transactional Free plan at 3,000 emails a month with a 100 a day limit, and Pro at $20 for 50,000. On the Marketing tab it lists a free tier at 1,000 contacts and Pro from $40 at 5,000 contacts, and says marketing plans are limited by contacts and not by emails sent. It also says broadcasts do not count against transactional limits. Paid and free plans include 10,000 automation runs a month, at $0.0015 a run beyond that, and I count one run per signup, since the docs say each trigger creates a run; confirm that against your first invoice.

Choose it if an engineer maintains the sequences in code. Skip it if the person who writes the welcome emails needs to change timing without help.

5. Customer.io: both kinds of email, at a higher entry price

Customer.io's pricing page lists Essentials at $100 a month for 5,000 profiles, with 1 million emails a month and transactional email included in every plan. That makes it the one paid option here where the verification mail and the welcome can share an account, vendor and domain. Its feature-adoption recipe shows that an email must be switched from Queue Draft to Send automatically before it goes out. Choose it if you are confident you will want event-driven sequences soon. Skip it if you are under a few thousand signups and want to spend under $50.

6. Encharge: Stripe-triggered welcomes for trial products

Encharge's pricing page lists Growth at $99 a month for 2,000 subscribers ($79 on yearly billing) and Premium at $159, with transactional email in Premium. Its Stripe triggers page includes "trial started", which makes a welcome that starts when a card-backed trial begins a no-code job. The matching flow template splits new trial users by job role into three buckets with different welcome emails. Choose it if your signup is a Stripe trial. Skip it if signup is free and has no billing event.

7. Userlist: when the welcome differs by account role

Userlist's pricing page lists Basic at $149 a month for up to 10,000 users, including transactional email and in-app messages. Its trigger documentation lists "user is first seen in Userlist" and "user joins a company", which lets the founder of a new workspace and the colleague they invite get different welcomes. Choose it if the invited-teammate case is half your signups. Skip it if you need a free or low-cost start.

Three welcome sequences

What your engineer sends is the same across all three: create the marketing contact with its source and plan as properties, send the verification mail through the transactional route, and send an event when the address is verified and when the first task is done. That is three calls, and it is the whole integration for the first month.

Sequence A: self-serve signup, free tier or trial without a card

What to build: a trigger on contact added (or on a verified event), three timers, and a check on the first-task property before emails 2 and 3. Email 3 is deliberately the reverse of email 2, so one person receives either, not both. In Loops that is a branch on a property, with the Contact added trigger available on the free plan, whose pricing page says all features are included. In MailerLite a four-email welcome with three delays is seven steps if each counts as one, which is more than the free plan's five. In Brevo the free plan lists marketing automation for up to 2,000 contacts. Skip email 2 for people who finished the task in their first session.

Sequence B: the invited teammate

1. On acceptance of the invitation: a marketing welcome naming the workspace and the person who invited them, with the one thing members do most. The invitation itself is a transactional email from your app.
2. Day 2, only if they have not signed in again: a short note on where the team's work lives and how to ask the inviter for access.
3. End. A third email is rarely welcome from a product the person did not choose. Do not enrol them in Sequence A.

Sequence C: a waitlist that opens

1. Launch morning: "You are in" with the access link, from the founder.
2. Day 2: the first task, for people who have not signed in.
3. Day 5: a short message asking whether the timing was wrong, with a way to move to the next batch.

The build risk is the import. Waitlist signups usually arrive as a spreadsheet. In Loops, tick the option that triggers workflows on that upload, and only on that upload, and check which segment the existing customers are in before you do.

What a welcome sequence costs at 500, 2,500 and 10,000 contacts

A welcome sequence uses few sends but fills the contact list quickly, so the costs depend on both numbers. The table sets out the plan each vendor lists at each contact count. Where the page gives no price at a size, the cell says so. All amounts are US dollars a month on monthly billing, excluding tax.

Contacts are not the only limit on a free plan. Assume each signup triggers five emails, the verification mail plus a four-email welcome. Then 100 signups a month means 500 sends, 500 signups mean 2,500, and 2,000 signups mean 10,000. MailerLite would not send the verification mail, so subtract one email per signup there; none of the verdicts below change. The vendors' pages also do not all say whether transactional sends share the marketing allowance, so every column counts them, which is the cautious reading.

The spike case is the one that surprises launches. If 400 people sign up in a day after a post goes live, that is 400 verification emails and 400 first welcomes, 800 sends. Brevo Free caps at 300 a day and Resend Free at 100, so some of the welcomes would arrive the next day or fail. Loops' pricing page lists no daily limit, only the 4,000 per 30 days and a ceiling of 10 emails per second. If you run the welcome as a Resend automation, only the verification mail counts against its transactional cap, because the pricing page says broadcasts do not; it does not say how automation emails count, so check before relying on that.

Where small-team welcome sequences break

Sending the welcome before the address works. Start the workflow from a verified event, not from the form. Resend's testing page warns that continued mailing of addresses that hard bounce or flag spam hurts your domain. Its test addresses, delivered@resend.dev and bounced@resend.dev, let you test without sending to fake recipients, though those test messages still count toward your quota.

A no-reply sender on the first email. The welcome is the only message in the series where a reply is truly useful. Use a real mailbox, and route replies to an inbox that someone reads. Authenticate the domain first; the email deliverability guide has the checks.

Copying a big company's sequence. A welcome series built for a product with a sales team assumes a person follows up. With three people and no sales team, replace "book a demo" with a question you will actually answer.

Admin-approved signups and consumer-scale volumes. If signup requires approval by an administrator, or happens through single sign-on provisioned by an IT team, the person did not choose to join and a marketing welcome may be unwelcome; send the transactional access email and nothing else. If you sell mainly to consumers at a volume of tens of thousands of signups a day, the free-plan arithmetic above is irrelevant and deliverability becomes the main issue.

Where to read next

Transactional versus marketing email goes further on the split in the second table. For a closer look at the two cheapest engines see Loops vs Resend. The next stage after welcome is covered on the SaaS customer onboarding page, and the trial side is in trial conversion sequences. For small teams generally, email tools for small teams compares seat limits.

Frequently asked questions

Should a SaaS welcome email be transactional or marketing?

Treat it as marketing. Loops' guide on the subject says a welcome email is usually promotional or onboarding content and that it should be sent as a workflow triggered when the contact is added, so that it respects unsubscribes. Keep the messages the person cannot proceed without, such as the verification link and the password reset, on the transactional side, and do not put the welcome text inside them.

How many emails should the welcome sequence have?

Three to five is enough for a small product: one that arrives within minutes, one that points to the first task, one that answers the question people ask in week one, and one personal message asking what they are trying to do. Verification is not part of the count, because it comes from your app. Stop the sequence for anyone who completes the first task, since the later emails would be about something they have already done.

Should the welcome be sent before or after the address is verified?

After, if your signup verifies addresses at all. A welcome sent on form submission goes to typos and fake addresses, and Resend's testing guidance warns that continuing to mail addresses that hard bounce harms your domain. The clean version is for your app to send an email_verified event, or to create the marketing contact only after verification, and to start the workflow from that.

Can I run the whole thing on Resend without a marketing tool?

Yes, if an engineer will own it. Resend's documentation describes automations that start from custom events sent by your app, with send-email, delay, wait-for-event and condition steps, and lists welcome emails among typical uses. Its pricing page shows a free marketing tier at 1,000 contacts. The trade is that the person writing the emails needs a developer to change anything about the triggers.

Which address should the welcome come from?

A named person at your own domain, such as maya@yourproduct.com, with replies going to an inbox someone reads. A no-reply address removes the one cheap signal that you are real, and the replies often contain the most useful product feedback you will receive. Authenticate the sending domain in the tool before the first real signup, not after.