Compare AI tools

	Lex A	Sudowrite S	Claude S	Aider A
Tagline	Google Docs with an AI collaborator baked in.	AI writing tool built specifically for fiction writers.	Anthropic's flagship — best reasoning + longest useful context.	Terminal-based AI pair programmer. Git-aware, model-flexible.
Category	writing	writing	chat	coding
Pricing	Free + $12/mo	$19-$59/mo	Free + $20/mo Pro + team/enterprise	Free (open source) + whatever API you use
Best for	Essays, long-form drafts, thinking on the page.	Novelists, screenwriters, fiction short-form writers.	Long writing, code, careful thinking, documents over 50 pages.	Developers who want open-source tooling with full control.
Strengths	Clean writing UX — distraction-free +++ prompt triggers AI help Collaboration + AI feedback together	Brainstorm, expand, rewrite modes designed for fiction Story Bible for character + plot tracking Understands voice + tone better than generic chatbots	Best-in-class writing + nuanced reasoning 1M context on Opus Artifacts for code/docs Lowest hallucination rate in my testing	Works in any terminal Auto-commits changes with meaningful messages Works with any model (Claude, GPT, local) Minimal learning curve
Weaknesses	Less feature-rich than Google Docs AI ceiling below dedicated tools	Pricey for casual use Fiction-only focus — not for business writing	Image generation is weak No native web search on all tiers	Terminal-only Less agentic than Claude Code Setup on Windows is fiddly
Kai's verdict	A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.	S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.	S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.	A-tier. The right answer if you want open-source + terminal-native + model-agnostic.
Link	Open →	Open →	Open →	Open →