Compare AI tools

	OpenRouter S	GitHub Copilot B	Writesonic B	Fathom S
Tagline	One API, every model. Pay-as-you-go, no subscriptions.	Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.	SEO-first AI writer. Optimized for ranking content.	Meeting notes, free forever for individuals.
Category	dev platform	coding	marketing	meeting
Pricing	Pay per token — model-dependent	Free (limited) + $10/mo Pro + $19/mo Business	Free + $15-$99/mo	Free for individuals + $15-$29/user/mo teams
Best for	Developers experimenting across models. Apps that want fallback logic.	Teams with GitHub already. Devs who don't want to change IDEs.	Content marketers churning out SEO articles.	Solo operators, freelancers, small teams on a budget.
Strengths	300+ models from one endpoint Automatic fallbacks between providers No subscription — just pay what you use	Great enterprise story Works in your existing IDE Chat + autocomplete	SEO built-in (Surfer integration) Article generator for long-form Chatsonic for research	Unlimited free tier for solo use Strong summaries + action items Works in Zoom, Meet, Teams
Weaknesses	Slight markup over direct API Some provider features not exposed	Less agentic than Cursor/Claude Code Model quality varies	Output quality behind Claude for polish SEO automation can produce generic content	Bot-joining model Team features gated
Kai's verdict	S-tier for model-shopping. I use this for every prototype before committing.	B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.	B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.	S-tier for solo + free. The best free option, hands down.
Link	Open →	Open →	Open →	Open →