Lex

Google Docs-style writing app with an LLM sidekick wired into every sentence.

Freemium· Free tier; Lex Pro paid (price not public); Teams add-onWritingMulti-model (GPT-4.1, Claude)

Best for

Pick Lex if you live in long-form prose and want a Google Docs replacement where an LLM is one keystroke away from every paragraph.

Skip if

Skip it if you need an API, programmatic content pipelines, or a transparent enterprise pricing sheet before you'll evaluate.

Lex is a browser-based document editor that looks and feels like Google Docs but bakes in AI commands for drafting, brainstorming, line-level feedback, and title generation. You write in a clean minimal canvas, and a chat-style assistant can be invoked on a selection or the whole document to rewrite, critique, continue, or fact-check passages without leaving the page.

The pitch is for professional writers, editors, and teams who want AI help without learning a new interface or piping prose between tabs. Pro unlocks access to frontier models (GPT-4.1, Claude, and others) plus early features and priority support; a free tier covers casual use, and a Teams add-on enables shared folders. Lex claims 300,000+ writers and name-checks Google, Microsoft, Harvard, Stanford, the New York Times, and BuzzFeed among its users.

Live collaboration, comments, version history, and read-only publish links round out the document-app fundamentals, and Track Changes is on the roadmap. There's no public API, no self-host option, and pricing detail is mostly hidden behind a signup or email request, which makes procurement a touch awkward for larger teams.

Editor's take

Lex is one of the more tasteful AI writing apps because it respects the document-first workflow instead of forcing you into a chat panel. The multi-model Pro tier is genuinely useful, but the coyness around pricing and the missing API ceiling its appeal for teams that want to standardize on it.

— The AI Tool Bible editorial team