Free validation evidence tool · Index v1.0

Product Validation Evidence Strength Calculator

Grade the strongest evidence you actually have. The model is published, equal-weighted, and designed to tell you what to strengthen next—not to predict whether a product will succeed.

Results stay in the browser. Shared links contain only six 0–4 scores, never your product idea or free-text notes.

Buyer proximity

0 = non-buyer/general audience · 4 = qualified buyer who recently experienced the problem

Behavioral commitment

0 = passive opinion · 4 = deposit, purchase, paid pilot, or equivalent economic commitment

Recency

0 = more than 12 months old/unknown · 4 = within seven days or the current buying situation

Repetition

0 = one isolated observation · 4 = 15+ similar qualified observations

Source independence

0 = same person/source repeated · 4 = pattern across multiple independent channels or sources

Economic signal

0 = no visible cost/effort · 4 = money committed to the offer/test or a close substitute

See full rubric

Decision rubric only. Equal weights are a methodological choice in v1.0, not empirically estimated success weights.

Strengthen, don't decorate

Your lowest dimension is the next experiment target.

Instead of collecting more of the same evidence, design a test that improves buyer proximity, commitment, recency, repetition, independence, or economic signal.