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Compare Stripe email integrations on supported events, synced billing data, setup, and reminder eligibility. Brew, Sequenzy, Loops, and Customer.io.
Brew publishes this comparison. We reviewed the linked product documentation on September 28, 2026; this is a documentation comparison, not a claim of hands-on testing of every platform. Check current plan limits on the vendor's pricing page.
A customer's card fails at renewal, and Stripe marks the invoice as failed. 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.
saas.purchase and saas.payment_failed.We checked each vendor's Stripe documentation on September 28, 2026 and compared:
| 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 | More than 20 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 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.session.completed, plus the async payment succeeded and failed events.trial_will_end, deleted.payment_failed, upcoming.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" 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.
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. Brew vs Sequenzy compares the two platforms beyond Stripe.
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. More than twenty events can start workflows, including customer, subscription, invoice, checkout and quote events, plus charge.dispute.created and charge.dispute.closed. Loops added more subscription events in April 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.
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.
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.
| 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 |
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.
They send the emails. Payment retries and card updates happen in Stripe. Brew's docs say that it cannot create charges or modify subscriptions.
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.
Yes. Brew recommends connecting Stripe test mode first and using Stripe's test webhooks. Loops' docs suggest creating test customers or firing events with the Stripe CLI's trigger command.
For the Brew side in detail, read the Stripe integration page, then build one flow in test mode before you connect live.
