ForthWrite - 2026 Pricing, Features, Reviews & Alternatives

ForthWrite is an AI-powered email drafting tool delivered as a Chrome browser extension, web application, and native Outlook desktop add-in. It operates inside existing Gmail and Outlook Web interfaces, generating reply drafts that reflect each user's individual tone, sentence rhythm, greetings, and sign-offs rather than a generic AI style. A voice profile is constructed automatically from real sent email history and rebuilds approximately every 50 captured sends. A closed-loop learning system compares each AI-generated draft to what the user actually sent, using heavily-edited pairs as negative training signals and sent-unchanged pairs as positive ones, producing a measurable improvement curve tracked via an improvement dashboard with metrics including acceptance rate, similarity score, edit distance, and time saved.

ForthWrite supports Gmail, Outlook.com, and Microsoft 365 across personal, family, and enterprise tenants. AI requests are routed through a managed proxy on AI Included plans or directly to the user's chosen provider via their own API key on BYOK plans. Nine AI providers are supported via BYOK, including OpenAI, Anthropic, Google, and xAI, allowing different models to be assigned to different email types. The Pro tier adds retrieval-augmented generation (RAG), injecting the most relevant past replies as live examples at draft generation time. Additional capabilities include auto-draft (replies generated in the background as email arrives), batch drafting of multiple threads in parallel, a Prompt Lab with version-controlled prompts and A/B testing against sent mail, and custom persona prompts for specific scenarios.

ForthWrite serves individual professionals across sales, recruiting, customer success, consulting, engineering, marketing, and senior leadership, as well as teams and businesses in SaaS, agencies, ecommerce, real estate, finance, healthcare, and nonprofits. A team plan provides a shared team persona, shared Prompt Lab library, team analytics dashboard, and admin seat management. A free tier offers 10 voice-matched drafts per week with no credit card required, and a BYOK option reduces subscription cost by approximately 17 percent for users who manage their own API keys. A 60-day voice-match guarantee with a refund option is available if drafts do not reflect the user's voice after a tuning call.