10 App Ideas, Counted from 2 Million App Store Complaints (2026)
Why most app-idea lists are invented
Search “app ideas” and the first page is Reddit threads and listicles with titles like “50 best app ideas” and “130+ creative app ideas.” Read a few and you notice something. None of the numbers in those titles refer to anything. Nobody counted 50 of something. The number is decoration.
The ideas themselves are usually plausible-sounding inventions, a fitness app for dog owners or an AI journal, with no evidence that anyone is dissatisfied with what already exists. That is a fine way to generate a list and a bad way to pick what to build.
How these were counted
The corpus is 2,029,091 US App Store reviews across 13,766 apps. For each category below, a panel of the 11 to 15 apps Apple surfaces for that market, and every review in it classified. One review, one complaint theme, at a time.
Then ordinary arithmetic over the labels:
- How many reviews carry each theme. How many people said it.
- How many apps carry it. Not how loud one app’s users are, but how many separate competitors have the same problem. This is the number that matters.
- How unusual it is. The same theme’s rate here, against its rate across the other 11,434 apps. Showing up seven times more often than usual means the problem belongs to this market. Showing up about as often as everywhere else means it is just what apps are like.
No model is ever asked “what are the top complaints.” That question produces confident narrative with arithmetic you cannot check. Every figure below is a COUNT, which is why the underlying reviews can be shown.
The ten ideas
Ordered by how unusual the complaint is for its market, with breadth across competitors as the tiebreak.
1. A note app that cannot lose your notes
11 apps · 2,788 reviews · Notability, Goodnotes, Notes, Noteful, CollaNote, SuperNotes and 5 more
Sync and data loss appears in all 11 apps, about seven times more often than the same complaint shows up in a typical category, and it is 15% of everything said here. The biggest single sub-pattern is “notes permanently lost or deleted”: 86 reviews across 10 of the 11 apps.
“All the notes that I had since 2024 randomly disappeared one day and I can't get them back on the app, I don't even want to or feel the need to use the note app anymore as I'm worried when I make new notes they'll just disappear again.”
Build
Local-first, plain files you own, sync as a convenience rather than the storage layer, and an always-visible saved state instead of a spinner. Not prettier, not more AI. The one thing all eleven incumbents fail at. See the full count.
2. A colour grading app that doesn't crash mid-edit
14 apps · 1,864 reviews · Lightroom, Prequel, VSCO and 11 more
Content and feature complaints appear in 10 of the 14 apps, roughly six times more often than usual, and make up 18% of everything said. Underneath that, crashes and freezes recur across 8 apps.
“Lovely filters, but the app is so buggy to use. The app freezes and closes every time I open it.”
Build
Reliability as the pitch, not features. A grading tool that opens instantly, never loses an edit, and keeps the free tier stable. The incumbents are shipping filters while users cannot get the app to launch. See the full count.
3. A shared budget where the bank sync actually holds
13 apps · 3,277 reviews · Monarch, EveryDollar, YNAB and 10 more
Sync and data problems hit 9 of the 13 apps, close to five times the usual rate. “Bank sync breaks repeatedly” alone accounts for 35 reviews across 7 apps.
“I really want to give five stars but can't because they cannot keep accounts synced. When you contact help they ask you to resign in which works 1/4 of the time.”
Build
Make broken connections visible and self-healing rather than silent. Show which accounts last synced and when, retry without asking the user to re-authenticate, and never blame the bank in a support reply. Three of these apps do exactly that. See the full count.
4. A screen-time blocker that doesn't paywall what already worked
13 apps · 2,762 reviews · Opal, AppBlock, Freedom and 10 more
Content and feature complaints hit 11 of the 13 apps, more than three times the usual rate. The recurring version is features moving behind a paywall after an update: 23 reviews across 6 apps.
“Used to be able to unblock app for limited period of time once you reach the limit….now all I can do is reset the limit.”
Build
A blocker with a stable feature set and a promise not to move existing functionality behind a tier. The complaint is not the price. It is paying for something and watching it get taken back. See the full count.
5. Invoicing without a cap you discover after paying
14 apps · 1,568 reviews · Invoice2go, Invoice Fly, Zoho and 11 more
Plan limits appear in 9 of the 14 apps, about three and a half times the usual rate. The sharpest version is a cap on invoices per plan: 43 reviews across 7 apps. Support complaints are wider still, in 11 of the 14.
“The price in the website its a lie. They sell the $98.99 unlimited invoices when in reality its just a hook. After you purchase the Pro Plan they tell you its only 10 invoices.”
Build
State the limits before payment, in the App Store description. A tradesperson sending 30 invoices a month is a good customer, and the incumbents are optimising for the upgrade prompt instead. See the full count.
6. A flashlight that turns on
15 apps · 2,225 reviews · the top flashlight utilities
Ads appear in 14 of the 15 apps, roughly two and a half times the usual rate, and account for 26% of all complaints. Those reviews average 1.98 stars. The specific pattern is ads standing between the user and an emergency light: 37 reviews across 10 apps.
“Sketchy light. Sometimes works, sometimes it doesn't. Seems when I need it the most I get bombarded with ads.”
Build
One tap, no ad before the light. Charge a one-off dollar if you must. Fourteen of fifteen competitors have decided an interstitial is worth more than a working flashlight at the moment someone needs one. See the full count.
7. A scheduler that stays connected to the accounts
14 apps · 2,788 reviews · Planoly, Later, Buffer, Hootsuite and 10 more
Login and account-connection failures appear in all 14 apps, more than twice the usual rate, and make up 30% of all complaints. Those reviews average 1.81 stars.
“I download planoly every year and i run into the same issue every time: it will not connect to my facebook account. It just keeps saying 'error try again later'. Its basically unusable for me.”
Build
Treat the platform connection as the product, not plumbing. Proactive re-auth before tokens expire, a clear per-network status page, and a queue that survives a disconnection instead of silently dropping posts. See the full count.
8. A budgeting app you can log back into
14 apps · 4,584 reviews · the largest panel here
Login and account access is a problem in 13 of the 14 apps, more than twice the usual rate, and 30% of every complaint in the category. Not billing, not features. People locked out of their own budget.
“I have been unable to get into my account and nothing is working to resolve and there's no real support.”
Build
Boring, reliable auth with a real recovery path and a human at the end of it. This is the least glamorous item on the list and the one with the most reviews behind it. See the full count.
9. A habit tracker that doesn't charge after you cancel
14 apps · 4,346 reviews · Fabulous, Streaks, Habitica and 11 more
Billing complaints are 62% of everything said in this category, across 11 of the 14 apps and about twice the usual rate. The specific pattern is charges during or right after a free trial: 44 reviews across 8 apps.
“You all have a lot of audacity. I purposely cancelled my free trial way before it ended, yet you have the nerve to still try and charge me $39.99 2 weeks later. IT WAS CANCELLED.”
Build
An honest trial: a reminder before it converts, one-tap cancellation, and a refund policy you state up front. In a market where 62% of complaints are about money, trust is the differentiator nobody is competing on. See the full count.
10. A focus timer that doesn't interrupt the focus
14 apps · 3,652 reviews · Forest, Focus Keeper, Study Bunny and 11 more
Ads show up in 11 of the 14 apps, around two-thirds more often than usual. The largest sub-pattern is ads interrupting an active study session: 47 reviews across 7 apps. A further 30 reviews across 7 apps report ads shown to people who had already paid.
“I miss when apps just did what they advertise. I remember using this app back in the day as a useful simple timer app to track study sessions.”
Build
A timer that is a timer. No interstitial during a session, and if someone pays, no ads at all. The second one sounds obvious and seven of these apps get it wrong. See the full count.
When a complaint becomes an idea
The rule that separates the ten above from the thousands of complaints that did not make it: breadth beats volume.
One app with 300 reviews about crashes is that company’s engineering backlog. Six apps with 40 reviews each about the same crash is a category that has not solved a hard problem. The first is somebody’s bug. The second is a market position.
What this can’t tell you
Reviewers are a biased sample. People who bother to write are disproportionately annoyed. That is why the figures here are comparisons rather than rates. “Seven times more often” does not mean 7% of users hit the problem. It means the complaint shows up seven times more often here than the same theme shows up everywhere else, with the same bias on both sides of the comparison.
Three things these counts genuinely cannot answer:
- Prevalence. What share of all users experience the problem is unknowable from reviews.
- Whether you can reach those users. A counted gap is not a go-to-market plan, and acquisition is usually the harder half.
- Whether the incumbent is about to fix it. These are snapshots. A gap can close with one release.
What they do establish is that the problem is real, recurring, and unsolved across most of a market, which is more than any list of invented ideas can offer.
Check your own category
Ten is what fits in an article. There are 126 counted categories, and the same arithmetic runs on any of them.
The ranked ideas board ranks markets by counted gaps. The category index has the free complaint rankings for each. Both are free to read with no signup, and every number on them links back to the reviews it came from.
Frequently asked
Where do these app ideas come from?
From counted App Store reviews. Every review in a category is classified into a complaint theme, then the themes are counted: how many reviews carry one, how many distinct apps carry it, and how often that theme shows up here compared with 11,434 other apps. An idea qualifies when a complaint recurs across most apps in a market rather than one.
Are these app ideas actually validated?
They are validated as problems, not as businesses. The counts prove that a specific complaint recurs across most competing apps and that nobody has fixed it. They say nothing about whether the affected users can be acquired profitably, which is a separate question the reviews cannot answer.
What makes a complaint worth building on?
Breadth. One app with a sync bug is that company's engineering backlog. Eleven of eleven apps with a sync problem is a category that has not solved a hard thing. How unusual the complaint is matters too: one that shows up seven times more often here than in a typical category is specific to that market rather than normal for apps.
How many reviews were analysed?
2,029,091 US App Store reviews across 13,766 apps as of August 2026. Each of the ten categories below is a panel of 11 to 15 competing apps and between 1,500 and 4,600 reviews.
Can I see the reviews behind each number?
Yes. Every figure links to a full report listing the complaint themes, the app-by-app spread, the sub-patterns inside each theme and the verbatim reviews. All of it is free to read with no signup.
Are these ideas already taken?
The categories all have incumbents, and that is the point. An empty market is usually empty for a reason. These are markets with paying users whose top complaint has gone unfixed across most or all of the competing apps.
Keep reading
What is this?
The short version, for anyone who landed here from a link.