Find the fatal flaw in your idea before the market does
Most startup ideas die of one specific, knowable problem — no real demand, no moat, a market too small, a wedge that does not work. The trouble is that excitement blinds founders to it, and a single chatbot, prompted by an enthusiastic founder, tends to cheer the idea on rather than interrogate it.
Decidi validates your idea through a deliberately sceptical panel — a critical investor, a target customer, a market analyst and a devil’s advocate — across four frontier models. They probe demand, differentiation, timing and unit economics, then deliver an honest verdict on whether it is worth building and what would have to be true for it to work.
- Honest validation designed to resist founder optimism
- The single most likely reason the idea fails, named
- Demand, differentiation, timing and economics each tested
- The target customer’s real objection, voiced directly
- What would have to be true for the idea to win
- A go, refine or rethink verdict — not empty encouragement
Part of: How Decidi works
A validation verdict: build, refine or rethink — with the fatal flaw, the assumptions to test, and what success requires.
Common questions
Will it just tell me my idea is good?
No. The panel is built to be sceptical — a critical investor, a target customer and a devil’s advocate whose job is to find the flaw. You get an honest verdict, including the most likely reason the idea fails, rather than reassurance.
What does it actually check?
Whether real demand exists, whether you can differentiate and defend it, whether the timing is right, and whether the unit economics work. It also voices the target customer’s real objection so you hear the no before you build.
How is this better than asking ChatGPT to validate my idea?
A single model tends to mirror your enthusiasm. Decidi runs four rival models and a sceptical panel that argue against the idea, so the validation survives real challenge instead of agreeing with the framing you gave it.
Try it on your own decision
Put your question to a council of GPT, Claude, Gemini and Grok — they debate it, a Final QA audit reviews it, and you get one clear verdict. 1,500 free credits to start — no sign-up, no card required.
Start free