Listed alphabetically. A tool is ranked by its reviews once it has 3.
Writing tools with a public API Tool Reviews Lowest paid plan Free plan Free trial Public API Runs on Main features Anyword AI content platform for GTM teams that care about performance and brand Reviews None yet Write one for Anyword Lowest paid plan $49 per month Starter, as of October 23, 2026 Free plan Not confirmed Free trial 7 daysPublic API YesRuns on Chrome extension Main features Data-driven editor Blog wizard Content improver Copy.ai GTM AI platform that automates tedious, repetitive tasks for sales and marketing teams Reviews None yet Write one for Copy.ai Lowest paid plan $29 per month Chat, as of October 20, 2026 Free plan Not confirmed Free trial Not confirmed Public API YesRuns on Not confirmed Grammarly Personalized AI writing guidance and text generation on any app or website Reviews None yet Write one for Grammarly Lowest paid plan $12 per member per month, billed annually Pro, as of October 19, 2026 Free plan YesFree trial 7 daysPublic API YesJasper Orchestrate AI agents to run end-to-end marketing workflows Reviews None yet Write one for Jasper Lowest paid plan $69 Pro, as of October 19, 2026 Free plan Not confirmed Free trial 7 daysPublic API YesRuns on LanguageTool AI-based grammar checker for grammar, punctuation, style, and spelling in 30+ languages Reviews None yet Write one for LanguageTool Lowest paid plan Not confirmed Free plan YesFree trial Not confirmed Public API YesRuns on macOS, Windows, iOS, Chrome extension WRITER Enterprise AI agent platform to execute and scale on-brand, compliant work Reviews None yet Write one for WRITER Lowest paid plan See plans Free plan Not confirmed Free trial 14 daysPublic API YesRuns on Not confirmed
From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made A tool is listed here only when we've confirmed on its own website that it has a public API. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed