The uncomfortable truth about AI estimates

"ChatGPT is free. Why pay for estimates?"

Great question. Here's the uncomfortable answer: free AI estimates are worth exactly what you pay for them. When a client asks "how much?", you need numbers you can defend, not AI hallucinations.

ChatGPT estimate "15k - 150k €" Thanks, very helpful.
VS
StacksFinder estimate 47 200 - 58 400 € Mid-level, 340-420h, France rates
01

The Problem with AI Estimates

LLMs are incredible at many things. Consistent numerical estimates is not one of them. Here's what happens when you ask ChatGPT to estimate a project:

You asked: "Estimate a SaaS MVP"
AI said: "Around 15 000 to 50 000 €"
Range so wide it's useless
You asked: "How long for an e-commerce site?"
AI said: "2-6 months with a team"
Which team? What features?
You asked: Same prompt, 5 minutes later
AI said: "30 000 to 80 000 €"
Completely different answer
The core issue: LLMs don't "know" prices. They predict plausible-sounding text based on training data. A 50k € estimate and a 500k € estimate are equally "correct" to the model. It's just generating words.
02

ChatGPT vs StacksFinder

Aspect ChatGPT / Claude StacksFinder
Pricing accuracyHallucinates numbers based on training dataDeterministic lookup tables, updated quarterly
ConsistencyDifferent answer every time you askSame specs = identical estimate
Transparency"Trust me bro" - black box reasoningFull breakdown: hours, complexity, risks
Professional outputCopy-paste chat into a docExport-ready PDF quotes
Market contextOutdated training data (months old)Live competitor & pricing research
Cost20 €/month for GPT-4Free tier available, Pro from 29 €
03

Our Approach: Best of Both Worlds

We don't throw away AI. We use it where it excels, and use deterministic systems where consistency matters.

AI-Powered

Scope Analysis

Claude analyzes your specs and identifies:

  • Feature breakdown with complexity
  • Technical risks and dependencies
  • Hours estimates per component
  • Project type and industry
AI excels at understanding context and breaking down complexity
Deterministic

Pricing Engine

Versioned lookup tables calculate:

  • Hourly rates by region & seniority
  • Complexity multipliers
  • Risk buffers
  • Final price ranges
Same inputs = same price. Every time. No exceptions.

Full Transparency

Every estimate shows exactly how we calculated it:

Hours breakdown by feature
Complexity factors applied
Risk analysis with mitigations
Regional rate sources
04

Built by Developers, for Developers

2,500+
Estimates generated
89%
Within 15% of final cost
340+
Agencies using Pro

"I used to spend 2 hours on initial estimates. Now I drop the spec into StacksFinder, review the breakdown, and send a professional quote in 10 minutes. The transparency helps me justify rates to clients."

Freelance Developer France, using StacksFinder since 2025

Ready for estimates you can actually trust?

Stop guessing. Stop hallucinating. Get project estimates backed by data, not vibes.

3 free estimates/week No credit card required PDF export (Pro)
05

FAQ

Frequently Asked Questions