Compare AI tools

	Cartesia S	OpenRouter S	GitHub Copilot B	Fathom S
Tagline	Ultra-low-latency voice. Built for realtime agents.	One API, every model. Pay-as-you-go, no subscriptions.	Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.	Meeting notes, free forever for individuals.
Category	Voice	Dev Platform	Coding	Meetings
Pricing	Free tier + usage-based API	Pay per token — model-dependent	Free (limited) + $10/mo Pro + $19/mo Business	Free for individuals + $15-$29/user/mo teams
Best for	Developers building voice agents, phone bots, interactive apps.	Developers experimenting across models. Apps that want fallback logic.	Teams with GitHub already. Devs who don't want to change IDEs.	Solo operators, freelancers, small teams on a budget.
Strengths	< 90ms latency — the fastest in the market Sonic model sounds natural Developer-friendly API	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	Unlimited free tier for solo use Strong summaries + action items Works in Zoom, Meet, Teams
Weaknesses	Fewer voices than ElevenLabs Less consumer-facing brand	Slight markup over direct API Some provider features not exposed	Less agentic than Cursor/Claude Code Model quality varies	Bot-joining model Team features gated
Kai's verdict	S-tier for realtime. If latency matters more than voice catalog, start here.	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.	S-tier for solo + free. The best free option, hands down.
Link	Open →	Open →	Open →	Open →