ForthWrite

Input—per 1M tokens

Output—per 1M tokens

Context—tokens

WeightsClosed

About

ForthWrite is ranked #1 of 28 in AI email writing tools on Inferse. It runs on API, Browser extension, macOS, Web, Windows. There is a free plan. A free trial is offered. Paid plans start at $24/mo.

Compared on AI email writing tools

Free plan: Yesforthwrite.ai
Tone controls: Yesforthwrite.ai
Custom instructions: Yesforthwrite.ai
Email context input: threadforthwrite.ai
Browser extension: Yesforthwrite.ai
Mail client support: bothforthwrite.ai

Facts

Purpose: ForthWrite drafts replies using a writing profile learned from a user's sent email.forthwrite.ai · 30 Sept 2026
Email clients: The free plan works in Gmail and Outlook on the web, and the Outlook add-in is available for Outlook desktop on Windows or Mac.forthwrite.ai · 30 Sept 2026
Slack: Slack drafting uses message and compose shortcuts or the /forthwrite command, and requires Standard or Pro.forthwrite.ai · 30 Sept 2026
Claude connector: The Claude connector can generate a draft or return a contact summary; it does not send mail or open a mailbox.forthwrite.ai · 30 Sept 2026
AI providers: The Outlook page lists BYOK support for OpenAI, Anthropic, Google, xAI, DeepSeek, Mistral, Perplexity, Cohere, and Groq.forthwrite.ai · 30 Sept 2026
Security assessment: ForthWrite says it passed Google's CASA Tier 2 assessment for its restricted Gmail read-only scope.forthwrite.ai · 30 Sept 2026
Data handling: The privacy policy says routine thread content is not retained after a draft is returned, while sent-email snippets are stored to learn the user's voice.forthwrite.ai · 30 Sept 2026
Team review: Teams owners and admins can view and export review records containing drafted messages, revisions, sent text, model, and timestamps.forthwrite.ai · 30 Sept 2026
Notable limitation: ForthWrite says it does not currently read or analyze email attachments.forthwrite.ai · 30 Sept 2026
Who it serves: The maker describes the product as software for professional services firms and individuals who write client email.forthwrite.ai · 30 Sept 2026
Support: The About page says the founder invites users to email feedback and bug reports directly at [email protected].forthwrite.ai · 30 Sept 2026
Company: ForthWrite is operated by Aesir Labs, LLC; its founder is Curtis Boortz, listed in San Diego, California.forthwrite.ai · 30 Sept 2026