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Early signalⓘEvidence tiers: Early signal = 1 uncorroborated request — treat as radar, not a validated opportunity · Corroborated = 2-3 requests · Validated = 4+ requests from 2+ different people. Every count appears exactly once, in the fact bar below — each traces to a real source post.
Personal book catalog system
Hard requirements
Non-negotiables stated by builders in their own words. Miss one and they will not switch.
connects reading-session log to main book databasetracks various statisticsallows daily page goal setting
Competitor pricing
Named rivals & real prices 🔒
Rivals charge $4.99-$15.99/mo · names — log in ↗
How we checked
Where we searched
2 sources · GitHub (open-source check) · SaaS marketplaces
Verification funnel
42 raw matches scanned, then AI-de-duped · see the breakdown below
Last scan
today · auto-refreshed every 30 days
Sign in to see the full opportunity
Every source post · named rivals with real prices · what builders tried & dropped · quantified pain — all traceable to the original posts
Sign up free →Signal history
2 posts on record since Jul 2026 — not enough to plot a trend. We plot history once a gap has 3+ posts spanning 3+ weeks.
Evidence pool
2 source posts on record — each insight links back to a real one.
2 reddit