Sinth
Query 5 AI models simultaneously, get one unified synthesis
I've been building Sinth as a side project — an Android app that sends your question to Claude, ChatGPT, Gemini, DeepSeek, and Grok simultaneously, then generates a unified FUSION synthesis combining the best of all responses.
Why I built it: Each AI has blind spots. Claude reasons well, GPT is broad, Gemini is fast, DeepSeek is precise, Grok is blunt. Instead of choosing one, Sinth uses all five.
How it works:
BYOK (Bring Your Own API Keys) — no subscription, no middleman
All 5 AIs respond in parallel
Synthesis generated progressively as responses arrive
"Make it better" and "Redo with specific AI" buttons
Tech stack: React Native/Expo, Firebase Auth, Firestore, EAS Build
Cost to try: All 5 APIs have free tiers — zero cost to test Sinth.
Download (Android APK):
https://drive.google.com/file/d/1Tq-W2UnmLwoKcJo8UJGxOvwfi0ukXRGL/view?usp=sharing
Would love honest feedback from fellow builders — what works, what doesn't, what's missing.
1 Comment
Querying all 5 at once is interesting but doesn't that get expensive fast once you're past free tiers? Like one question suddenly costs 5x.
How good is the synthesis actually? Is it just mashing answers together or does it know when one model gave garbage and should be ignored?