Best email marketing tools with Stripe integration: Subscription events and automation compared

The best email marketing tool with a Stripe integration is Brew if you want Stripe's own events, billing fields on the contact and on-brand emails from one agent, followed by Sequenzy for ready-made SaaS lifecycle events, Loops for a simple SaaS email platform and Customer.io if you want to build the data model yourself.

Ranked November 2026. We re-checked each vendor's pricing page and documentation on November 1, 2026. Brew publishes this comparison, and it is a documentation comparison, not a claim of hands-on testing of every platform. Work at Sequenzy, Loops or Customer.io? If anything here is wrong or out of date, email support@brew.new and we will correct it.

A customer's card fails at renewal, and Stripe sends invoice.payment_failed (the invoice stays open). Your email tool starts its payment reminder flow. The customer updates the card the next morning, and the second reminder still goes out that afternoon.

Many email platforms list a "Stripe integration." The integrations behind that label work in different ways. One tool listens to raw Stripe webhooks and syncs a customer's plan and subscription status. Another turns billing activity into its own event names. A third gives you a guide for wiring webhooks yourself.

These differences decide whether a trial reminder can check the trial status, and whether a failed-payment follow-up stops once the card works. This guide compares four platforms on those points.

Key takeaways

• Look at three things: how the tool connects, which events it receives, and which billing fields it keeps on the contact.
• Brew and Loops receive Stripe's own event names. Sequenzy converts them into SaaS events such as saas.purchase and saas.payment_failed.
• The hard part is stopping a sequence after payment. Sequenzy has a built-in stop condition. In Brew, check the live invoice in your application before firing a later reminder event.
• Stripe can send its own failed-payment and trial emails. Decide which system owns each message before you build.

What we compared

We checked each vendor's Stripe documentation on November 1, 2026 and compared:

1. Connection method: OAuth app, or webhooks you configure.
2. The Stripe events a flow can start from.
3. Billing data stored on the contact for segments and conditions.
4. How a flow stops or branches once billing state changes.

At a glance

Tool	Connection	Events	Billing data on the contact	Stopping a flow
Brew	OAuth; Brew registers the webhook for you	22 Stripe events across checkout, customer, subscription, invoice, quote and payment	stripe_subscription_status, stripe_subscription_plan, stripe_plan_amount_cents, stripe_trial_end, stripe_renews_at, stripe_delinquent	Explicit conditions on synced contact fields; application checks for a particular unpaid invoice
Sequenzy	OAuth	SaaS lifecycle events derived from Stripe	MRR, LTV, and tags such as trial, past-due, churned	One stop condition per sequence, for example on saas.purchase
Loops	Connect to Stripe in settings	19 Stripe events, including disputes	Email, first and last name	Workflow branches
Customer.io	A guide to webhook-triggered campaigns	The events you send it	Whatever you map	Campaign conditions

Brew

Brew connects through a Stripe Apps OAuth flow, so it never sees your API keys. It then registers the webhook itself and subscribes to 22 event types:

• Checkout: checkout.session.completed, plus the async payment succeeded and failed events.
• Customer: created, updated, deleted.
• Subscription: created, updated, paused, resumed, trial_will_end, deleted.
• Invoice: created, paid, payment_failed, upcoming.
• Quote: finalized, accepted, canceled.
• Payment: charge.refunded, refund.created, payment_intent.payment_failed.

Each verified event starts any Live automation that uses it. Customer and subscription events also upsert the Stripe customer into your audience with stripe_* fields you can filter on. A "Sync customers from Stripe" button backfills existing Stripe customers in the background and can resume if it is interrupted.

In the email itself you can use merge tags such as amount, currency, invoiceNumber, previousPlan and newPlan, failureMessage and declineCode. Payloads leave out Stripe object IDs on purpose, so you cannot use them as merge tags or filters.

Brew receives events; it cannot retry a charge, issue a refund, or change a subscription. After a Wait, a condition on contact.stripe_subscription_status reads the current Brew contact field, while event fields retain the original payload. The contact read does not query Stripe or prove that a particular invoice was paid. Check that invoice in your application before firing a later payment-reminder event. Contact updates and new events do not automatically cancel existing runs. See the automation guide.

Brew also designs and sends the emails. Payment and trial emails use your brand's design system and go out from your verified domain, so you do not need a separate template tool.

Why it ranks first: Brew is fully agentic. It receives Stripe's own events, keeps billing fields on the contact, and its agent designs and sends every payment and trial email on brand, so one product covers the whole flow.

Sequenzy

Sequenzy's Stripe integration connects by OAuth. Before the first sync, you choose which products to include and which metadata to carry over. It then translates billing activity into SaaS lifecycle events, including purchases, trial started and trial ended, cancellation, churn, payment failed, upgrade, downgrade and refund.

Contacts get MRR and LTV as numeric attributes, plus status tags like customer, trial, past-due and churned. Each sequence has one stop condition, checked before every step, so a trial sequence can end on saas.purchase without extra filters.

Sequenzy matches contacts by email only. It leaves guest Checkout Sessions without a customer out of revenue sync.

Sequenzy fits SaaS teams that want subscription lifecycle states ready to use and do not need Stripe's raw event names.

Why it ranks second: its lifecycle events and stop condition save setup, but it replaces Stripe's event names with its own and matches contacts by email only.

Loops

Loops connects from Settings with Connect to Stripe. It syncs email, first name and last name. It creates a contact if the email is new, and it can unsubscribe or delete contacts on customer.deleted. Nineteen events can start workflows, including customer, subscription, invoice, checkout and quote events, plus charge.dispute.created and charge.dispute.closed. Loops added more events, including subscription, quote and async checkout events, in March 2026.

Loops only processes events that contain an email address. Its docs do not list plan or status among the synced properties, so conditions on billing state need data from another source.

Why it ranks third: it receives Stripe's own event names, but it keeps only email and name on the contact, so billing conditions need data from elsewhere.

Customer.io

Customer.io documents Stripe as a pattern you build. You point Stripe's webhooks at a webhook-triggered campaign, find the person by email, and set their ID to the Stripe customer ID. From there you can model any billing data you like, and use it across email, SMS and push. It takes more setup than the other three and gives you more control over the data model.

Why it ranks fourth: nothing comes ready-made. You build the webhook campaign and the billing data model yourself.

Coordinate with Stripe's own emails

Stripe Billing can email customers itself. It can send a notice after each failed card payment, a reminder seven days before a free trial ends, renewal reminders, and a warning a month before a default card expires. These emails link to a page where the customer can update their payment method.

If you turn those on and also build a Brew or Loops flow on invoice.payment_failed, customers get two emails about one failure. Decide which system sends each message. One split is to leave the payment-update link to Stripe and use your email platform for the explanation and follow-up. Check that the link you put in your own emails is still valid.

Which fits

If you want...	Look at
Raw Stripe events, synced billing fields, and emails designed and sent in one product	Brew
SaaS lifecycle events and built-in stop conditions	Sequenzy
A simple SaaS email platform with broad Stripe event coverage	Loops
Full control of the data model across several channels	Customer.io

Frequently asked questions

Which Stripe events matter most for lifecycle email?

For subscriptions: customer.subscription.trial_will_end, invoice.payment_failed, invoice.paid, customer.subscription.updated and customer.subscription.deleted. Stripe sends trial_will_end three days before a trial ends, or immediately if the trial is shortened.

Can these tools recover failed payments?

They send the emails. Payment retries and card updates happen in Stripe. Brew's docs say that it cannot create charges or modify subscriptions.

Do I need consent to email Stripe customers?

For marketing email, yes. Brew's Stripe docs say syncing contact data is not permission to email it. Receipts and payment notices about an existing subscription are a different category. See transactional emails.

Can I test without real customers?

Not in Stripe test mode: Brew connects live Stripe accounts, and test-mode events don't sync contacts or start automations. Keep the automation a draft and test it with controlled recipients. Loops' docs suggest creating test customers or firing events with the Stripe CLI's trigger command.

Next step

For the Brew side in detail, read the Stripe integration page, then build one flow as a draft and test it with controlled recipients before you publish.