Type your idea and your income goal. See what has to be true, which assumption is doing all the work, and the cheapest way to test it this week.
Idea: "$29 template pack for wedding photographers" · Goal: $3,000/mo
The math: $3,000 ÷ $29 ≈ 104 sales/mo. At the median cold conversion for an unknown seller (0.5–2%), that's 5,200–20,800 visits/mo. The assumption doing all the work: conversion. Median first-dollar timeline in this class: 3–4 months (SaaSRanger, n≈1,000).
Cheapest test: a $0 waitlist page + 10 real answers from photographers — 7 days.
Median Gumroad creator earns $72/mo; the median product sells 28 copies lifetime (146K products analyzed, 2026). We build against medians — so your plan survives contact with reality.
Ask ChatGPT and it answers — then forgets. We keep a ledger of your unproven assumptions and come back in 30 days to ask what the test showed.
How we make money
The core mirror is free. Later: optional deep protocol packs (one-time), and when a step needs a tool, we show ranked options — including at least one we earn nothing from. Recommendations never change your math.
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