Thousands of people are telling you which apps to rebuild.
They leave one-star reviews. We read them, group the complaints that repeat, and score what's left — markets where people already pay for software they openly dislike.
68,505 verbatim complaints · 56 of them say one thing
- Highest scoring opportunities right now:
- Small business users need intuitive accounting software with seamless bank reconnection workflows and clear invoice status tracking (sent/paid confirmation), avoiding complex UI changes that require extensive support calls.
- AI code generation workflows create friction through slow spec-to-code loops, inconsistent output across different agents, hidden logic errors that bypass specifications, and scalability issues in complex projects
- Users need calendar apps with reliable data persistence and backup recovery options to prevent catastrophic loss of event history
- Users need a reliable universal smart home platform that maintains stable device connections over time and doesn't lose third-party integrations with software updates.
- Users need a calorie tracking app that enables fast, reliable data entry without advertisement interruptions and maintains an intuitive, user-friendly interface.
- Users struggle to cancel subscriptions and continue being charged despite attempting cancellation
- App requires frequent re-authentication instead of maintaining persistent login sessions
- Long-term crypto holders need a wallet with reliable withdrawal processing, transparent account restriction policies, and responsive human customer support instead of automated copy-paste responses
- Resellers need an affordable crosslisting tool that accurately automates listing across multiple platforms without creating time-consuming error-correction work.
- Small business owners need highly reliable business VoIP service that does not experience frequent outages preventing customer contact
What this is — and what it isn't
Most of the evidence comes from mobile app reviews, because that is where dissatisfied users repeat themselves at scale. If you want an unbuilt idea nobody has thought of, this is the wrong tool. If you want a market where the incumbent is disliked and the complaints are specific enough to build against, it is the right one.
77% one source
0–100
How scoring works
Each opportunity scores across demand, pain intensity, supply gap and feasibility. Then the total is scaled down when a cluster rests on few mentions. Nothing here is ranked on our opinion.
- Demand
- 30
- Pain intensity
- 25
- Supply gap
- 25
- Feasibility
- 20
One angry review is an anecdote, sixty are a market.
2,303 clusters ranked
3 free
2,300 locked
- 0181Calendar app with reliable data persistence and backups70
- 0280Intuitive small business accounting with seamless bank reconnections42
- 0386Consistent AI code generation without hidden logic errors70
- 0486Locked — subscribe to read this opportunity54
- 0585Locked — subscribe to read this opportunity26
- 0685Locked — subscribe to read this opportunity39
- 0785Locked — subscribe to read this opportunity17
- 0884Locked — subscribe to read this opportunity47
- 0983Locked — subscribe to read this opportunity281
- 1083Locked — subscribe to read this opportunity27
One tier. $29 a month.
The three examples are free in full, permanently — quotes, the apps people are leaving, the score breakdown. Pro is the rest of the list, with search, category filters and a weekly digest.