TypeBoost is a personal AI writing toolkit for macOS and iOS built around one idea: the assistant should live where you write, not in a separate tab. Select text in any app, press a space-based shortcut, choose a prompt, and the improved text is inserted back exactly where you were working. It handles grammar and spelling, smarter email phrasing, translation and rewriting, and it can also take voice input and turn it into clear text.
What sets TypeBoost apart is its unopinionated approach. Instead of locking you into one house writing style, it lets you bring your own prompts and choose your preferred models, so you build repeatable workflows that match your voice. On Pro you can draw on OpenAI, Anthropic and Google models. A granular diff view shows every change the AI made, and you can revert individual edits while keeping the rest — so you never lose a sentence you liked.
It runs across Apple devices: the macOS app and the iOS keyboard share your prompts and history, so the same workflow follows you from Mac to iPhone. The Free plan provides 50,000 credits to try it, and TypeBoost Pro is $5/month with 1,000,000 monthly credits, premium models and 60-day history. It is a fit for anyone who writes constantly and wants AI assistance without leaving their flow.