Letter

Spec sheet

Purpose

Letter describes itself as an email marketing automation platform for SaaS, covering lead capture, event-driven sequences, broadcasts, and transactional email.Read 12 Oct 2026 · letter.app

Free plan

YesRead 20 Sep 2026 · letter.app

Integrations

The integrations page lists Zapier, Facebook Lead Ads, Segment, PostHog, Make, and Tally.Read 12 Oct 2026 · letter.app

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.Read 12 Oct 2026 · letter.app

Audience segmentation

YesRead 20 Sep 2026 · letter.app

Broadcasts

Broadcasts can target segments built from contact traits, events, and lists, with a live audience preview.Read 12 Oct 2026 · letter.app

Company location

The site footer identifies the company as Bromance Studio SRL and lists Brussels, Belgium.Read 12 Oct 2026 · letter.app

Custom plans

Letter invites users with more than 500,000 contacts or needs for custom routing, dedicated IPs, or SLAs to request custom pricing.Read 12 Oct 2026 · letter.app

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.Read 12 Oct 2026 · letter.app

Developer access

Letter provides a REST API, CLI, typed SDKs, webhooks, and SDK examples for Node.js, Python, and Ruby.Read 12 Oct 2026 · letter.app

Email automation

YesRead 20 Sep 2026 · letter.app

Forms

Embeddable forms support double opt-in and spam protection, and add contacts directly to Letter.Read 12 Oct 2026 · letter.app

Native integrations

6Read 20 Sep 2026 · letter.app

Paid billing

Paid plans are billed monthly with no contract, and users can cancel anytime.Read 12 Oct 2026 · letter.app

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.Read 12 Oct 2026 · letter.app

Sequences

Its visual sequence editor supports event, form-submission, and list-entry triggers, branching, waits, and test sends.Read 12 Oct 2026 · letter.app

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.Read 12 Oct 2026 · letter.app

Plans and prices

Every Letter plan and price →

Where Specifiction places it

• Email Marketing Software#108 of 1877.9
• Email marketing tools#139 of 1877.5