If your idea uses AI and you can't model the token costs at 1k and 10k users, you're flying blind.

Is my idea any good?

Find out if your idea has a market, a margin, and what it will actually cost to run — before you write a line of code.
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42% of startups fail due to no market need82% fail from poor cash flow90% fail overall
Example·AI Invoice Chaser for Freelancers
Full examples here →
◎Opportunity: AI genuinely improves the emotional labour of chasing invoices — drafting escalating, contextual messages is exactly what language models do well.
◎Risk: FreshBooks, QuickBooks, and HoneyBook already have invoice reminders built in — your buyer may not know they already have a version of this.
◎Reality check: The serviceable market is narrower than the freelance economy headline suggests — you're targeting freelancers who invoice digitally but don't want full accounting software.
3/5

Genuine pain, but you're solving a feature not a product. Your window is the freelancer who doesn't want full accounting software — but that's a narrower market than the headline numbers suggest.

Free snapshot included  ·  Full report $19 one-time

“If you can't tell me your cost per user per month, your input/output token ratio, and your blended model cost, you're flying blind.”
— yellow3.io, 2026

How it works

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Real analysis, not cheerleading

Powered by Claude Sonnet 4.6. Gives you a 3-point snapshot — opportunity, risk, and a reality check — with no encouragement bias.

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AI cost modelling

Toggle AI mode and we calculate real token costs — input/output ratios, cost per query, and monthly burn at 100, 1k, and 10k users. The maths most founders skip.

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Full report for $19

Free snapshot shows 3 key insights. Unlock the full report for verdict, market sizing, tech stack, marketing tactics, red flags, and PDF download.

What we do differently

Most validators tell you what you want to hear. Here's what sets this apart.

Other validators

  • ✕Encouraging score, no real reasoning
  • ✕Inflated TAM with no caveats
  • ✕Generic 'use social media' advice
  • ✕Skip the hard questions
  • ✕Ignore AI running costs
  • ✕Generic startup frameworks

This tool

  • ✓Free snapshot: opportunity, risk, reality check
  • ✓Verdict with score and plain-English reasoning
  • ✓TAM/SAM/SOM with the caveats most skip
  • ✓Marketing tactics specific to your idea
  • ✓Red flags that actually kill this type of business
  • ✓Token cost modelling at 100, 1k, 10k users

Got feedback?

Suggestions, complaints, feature requests — all welcome.