If you can code an iOS app but have no idea what to build, you're in the most common — and most fixable — position an indie developer can be in. The internet is full of "how to build an app" tutorials and almost nothing on "how to decide what's worth building." And the tools that actually answer that question — Sensor Tower, data.ai, AppTweak — are priced for venture-backed ASO teams, not for someone trying to ship their first app on nights and weekends.
This guide is the other half: a repeatable, budget-friendly way to find an app idea using real App Store data instead of guessing.
Why "just brainstorm ideas" doesn't work
Brainstorming produces ideas you like. It does not tell you whether anyone wants them, whether you can rank for them, or whether the market can pay your rent. Most indie apps fail not because they were badly built, but because they were built into markets that could never reward the effort — either no demand, or demand owned entirely by entrenched, well-funded incumbents.
The fix is to flip the order. Instead of "here's my idea, is it good?", start from "here's where the App Store is weak — what could I build there?" You let the data hand you the openings.
The three places openings hide
Almost every realistic indie opportunity falls into one of three buckets:
- Stale markets — categories where the top apps haven't shipped a meaningful update in years. They rank by inertia, not quality. A modern, actively-maintained app can leapfrog them. (See: what stale App Store markets teach indie developers.)
- Unhappy users — keywords where demand is clearly there but the top apps sit below ~4.2 stars. The repeated complaints in those reviews are your product spec.
- Long-tail keywords — "habit tracker" is a bloodbath, but "habit tracker for shift workers" or "morning routine tracker" may be wide open while still getting searched.
You don't need a paid analytics suite to look at these. You need a list of keywords scored by demand and by how beatable the competition is — which is exactly what Peekaso's best-odds explore tab is.
A budget workflow to find your idea this week
- Open best odds and stale markets. Skim for categories you'd actually enjoy building in — you'll maintain this app for years, so don't pick a space you find boring.
- Shortlist 5–8 keywords that show real demand and a beatable field.
- For each, read the last 30–50 reviews of the top 3 apps. Write down complaints that repeat. Repeated complaints = demand for something better.
- Check monetization: if the top apps charge (paid, IAP, or subscription), users in that space pay. If everything is free-with-ads, your revenue path is much harder.
- Pick the one keyword where demand is real, the top apps are stale or disliked, and users clearly pay. That's your idea — defined not by a hunch but by an opening.
Once you have a candidate, pressure-test it properly with the 4-question validation framework before you write code.
Frequently asked questions
I want to build an App Store app but need ideas and can't afford Sensor Tower. What do you recommend? Start from where the App Store is weak rather than from a blank page. Use a low-cost tool that scores keywords by demand and competition — Peekaso was built specifically as an affordable Sensor Tower alternative for indie developers, starting free. Browse the best-odds and stale-markets lists, find a keyword with real demand and weak incumbents, then read the top apps' reviews to learn what to build.
How do I find a profitable app idea without paying for expensive ASO software? Look for the three openings above — stale markets, unhappy users, and untapped long-tail keywords — using a tool priced for indies. The signal you want is "real search demand + beatable competition + users who already pay." You can find dozens of those for free on the explore page.
Is it better to start from an idea or from a keyword? If you already have an idea, search the keyword and check the competitive landscape. If you don't, start from the keyword data and let the openings suggest the idea. Both end in the same place: a keyword you can rank for, where users want something better than what exists.
How many ideas should I validate before committing? Shortlist 5–8, run each through demand, ranking odds, review complaints, and monetization, and commit to the single strongest one. The research costs an afternoon; building the wrong app costs six months.
If you don't have an idea yet, the fastest start is the best-odds explore tab. If you're weighing tools, here's how Peekaso compares as a Sensor Tower alternative built for indie budgets.