No. 86of 189 ·Email Marketing Software

Letter

Web · API

Freedom report

One barScore 6.2

Free tierA free tier is on its own pricing page
Runs widely1 of 6 device platforms
DocumentedThinly documented

Letter is ranked #86 of 189 in email marketing software on Freedom251. It runs on API, Web. There is a free plan. A free trial is offered.

Letter plans and pricing

All plans

Free Free Free forever · no card required Up to 1,000 contacts · up to 5,000 emails sent/month · all features included · unlimited events tracked · includes a small “Powered by Letter” badge letter.app · 12 Oct 2026

Compared on email marketing software

Free plan: Yes
Email automation: Yes
Audience segmentation: Yes
Native integrations: 6 integrations

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The record

Purpose: Letter describes itself as an email marketing automation platform for SaaS, covering lead capture, event-driven sequences, broadcasts, and transactional email.
Forms: Embeddable forms support double opt-in and spam protection, and add contacts directly to Letter.
Sequences: Its visual sequence editor supports event, form-submission, and list-entry triggers, branching, waits, and test sends.
Broadcasts: Broadcasts can target segments built from contact traits, events, and lists, with a live audience preview.
Transactional email: Transactional email can be sent with a POST /v1/send API call using existing HTML and the same verified domain and delivery infrastructure as marketing email.
Integrations: The integrations page lists Zapier, Facebook Lead Ads, Segment, PostHog, Make, and Tally.
Developer access: Letter provides a REST API, CLI, typed SDKs, webhooks, and SDK examples for Node.js, Python, and Ruby.
AI assistants: Letter offers a remote MCP server for Claude, ChatGPT, and GitHub Copilot with OAuth and read-only or read-and-write access modes.
Data and billing limits: Pricing is based on the number of contacts stored, with unlimited events; the free plan is limited to 5,000 emails per month.
Paid trial: Every paid plan starts with a 14-day free trial with no card up front; afterward, the account drops back to the free plan if the user does not continue.
Paid billing: Paid plans are billed monthly with no contract, and users can cancel anytime.
Custom plans: Letter invites users with more than 500,000 contacts or needs for custom routing, dedicated IPs, or SLAs to request custom pricing.
Company location: The site footer identifies the company as Bromance Studio SRL and lists Brussels, Belgium.
Price from: Free

Where it ranks on Freedom251

Best Email Marketing Software in 2026#86 of 189

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Sources

letter.app· checked 12 Oct 2026
letter.app/features/transactional/· checked 12 Oct 2026
letter.app/integrations/· checked 12 Oct 2026
letter.app/pricing/· checked 12 Oct 2026