Ready to send better email?
Brew is the AI-native ESP. Define your brand once, ship on-brand email in minutes.
Brew is the AI-native ESP. Define your brand once, ship on-brand email in minutes.
Compare Loops alternatives for SaaS email design and automation. See Brew, Sequenzy, Customer.io, and Resend, with current capabilities and limits.
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.
Your team sends the product newsletter and the receipts from Loops, and both work. Then your designer shares a new brand, and someone has to restyle every template by hand to match it. Another week, a customer who already upgraded gets the trial-ending reminder anyway.
Loops handles marketing and transactional email in one account and includes transactional sending on paid plans. It also has an MCP server and a Stripe integration with over twenty events. If it covers what you need, stay.
This guide is organized by four reasons to look elsewhere: AI that designs the emails, stop rules that follow billing state, channels beyond email, and messaging to accounts instead of individual users.
We checked Loops' pages on September 28, 2026. The free plan covers up to 1,000 newest contacts and 4,000 sends in a rolling 30-day window, marketing and transactional combined. Paid plans are priced by subscribed contacts, with unlimited sends. Transactional recipients do not count as contacts unless you also send them marketing email, according to Loops' billing docs.
For agents, Loops has an MCP server, a CLI and skills. It can also send Supabase Auth email through an auth hook or SMTP. Any alternative should match the parts of this you use.
| Tool | Main reason to pick it over Loops | What you give up | Entry pricing |
|---|---|---|---|
| Brew | AI-generated on-brand emails and flows, Figma import, export to supported email platforms | Mailing-list preferences; Supabase Auth email | Free plan; Growth $99/mo |
| Sequenzy | AI-written sequences, Stripe-derived lifecycle events, one stop condition per sequence | Loops' contact-based pricing model | Free up to 2,500 emails/mo, then priced per email |
| Customer.io | Email, SMS, push and in-app with a flexible data model | Simplicity; more setup | Priced by profiles; startup program for new customers |
| Resend | Templates, visual editing, transactional sending, and Automations | A different brand-design workflow | Marketing free up to 1,000 contacts; Pro Marketing from $40/mo |
| Userlist | Company-level (account) messaging and in-app messages for B2B SaaS | AI design | 14-day trial; priced by users |
Brew builds your brand into a document called email-design.md, then generates emails and whole automations from a prompt. It can also remix a published signup or newsletter sequence from its flows gallery, keeping the pacing and rewriting every email for your brand. Emails open on a canvas where you edit by hand or by prompt. You can import existing designs from HTML, MJML, React Email or a Figma frame.
Like Loops, Brew handles marketing and transactional email in one account. Transactional sends go through a domain with a transactional sending purpose. It connects to Stripe (22 events), Supabase, Clerk, Shopify and others, and exposes an MCP server, CLI and REST API for agents.
For a feature-by-feature view, see Brew vs Loops. Brew's Loops migration guide lists what you give up. Brew has one subscription state per contact, no mailing-list categories and no subscriber preference center. If your readers choose between a product newsletter and a changelog list, you would rebuild those lists as properties and audience filters in Brew. Brew also does not send Supabase Auth email.
Sequenzy generates sequences from your website content and connects to Stripe, Paddle, Supabase, Clerk, PostHog and Shopify. Its Stripe integration converts billing activity into events such as saas.trial_will_end and saas.payment_failed, and adds MRR and LTV to each contact. Each sequence has one stop condition, checked before every step.
Pricing is by emails sent, with unlimited contacts, which suits products with large free-user lists. It fits SaaS teams that want lifecycle logic tied to revenue without wiring it up themselves.
Customer.io covers SMS, push, in-app and other channels alongside email, with objects and a Data Pipelines product. Its MCP server separates read, write and delete tools and starts read-only.
It fits teams that need more than email for lifecycle messages and have someone to own the data. For a small team it is more to set up than Loops. New customers that have raised under $10M can apply to its startup program for up to 12 months free.
Resend started as a transactional API. It added marketing broadcasts and, in April 2026, Automations with delays, wait-for-event steps, branches and an AI builder. Resend supports React Email and editable templates. Pricing is split: transactional has a free tier of 3,000 emails a month, and marketing is free up to 1,000 contacts, then $40 to $650 a month for 5,000 to 150,000 contacts.
It fits teams already using Resend for delivery. Compare its visual editing and agent workflow with your design requirements before adding another tool.
Userlist is built for B2B SaaS where the customer is a company with several users. It supports company-level automation, behavior-based campaigns, transactional email and in-app messages. It has a 14-day trial, and pricing scales with users, for example $10 a month per additional 1,000 users on Basic.
It fits products where "the account activated" matters more than "this user activated."
Whichever platform you choose, move in stages. Brew's migration guide suggests this order:
loops.sendEvent() becomes POST /v1/automations/triggers/{triggerEventId}/fire.Throughout the move, only one platform should send live email to a given contact at a time.
