Compare AI tools

	Lex A	Replicate S	GitHub Copilot B	Devin A
Tagline	Google Docs with an AI collaborator baked in.	Run any open-source AI model with an API call.	Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.	Cognition Labs' autonomous coding engineer.
Category	writing	dev platform	coding	agents
Pricing	Free + $12/mo	Pay per second of compute	Free (limited) + $10/mo Pro + $19/mo Business	$500/mo
Best for	Essays, long-form drafts, thinking on the page.	Developers using open-source models (Flux, SDXL, Whisper, etc).	Teams with GitHub already. Devs who don't want to change IDEs.	Engineering teams offloading tickets. Ops/platform work.
Strengths	Clean writing UX — distraction-free +++ prompt triggers AI help Collaboration + AI feedback together	Tens of thousands of models (image, video, audio, LLMs) One-line API for any model Cog framework for custom model deploy	Great enterprise story Works in your existing IDE Chat + autocomplete	Works like an engineer — takes Slack tasks, opens PRs Handles multi-hour engineering work Reports back with what it did
Weaknesses	Less feature-rich than Google Docs AI ceiling below dedicated tools	Cold starts on less-popular models Pricing gets real at scale	Less agentic than Cursor/Claude Code Model quality varies	Expensive Best for well-scoped tasks Not for solo hobbyists
Kai's verdict	A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.	S-tier for open-source model APIs. The default in this space.	B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.	A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
Link	Open →	Open →	Open →	Open →