Most app ideas that make money are dull ideas sold to people who already pay.

Three numbers set the ceiling, and one is not yours

Write these down before you get attached to anything. What one customer pays you each month. How many of those customers you can reach in a year without buying ads. And how much of the money survives the trip from a phone to your account. Multiply the first two, take off the third, and you have the honest ceiling on the idea. The rest is decoration.

The number people get wrong is the second one. Eight dollars a month sounds modest and fifty customers sounds easy, until you write down where the fifty come from. If the answer is App Store search, the plan has a hole in it, because nobody searches for a category that does not exist yet. If the answer is a trade group you have posted in for two years, the plan is sound and the app is almost an afterthought.

The third number is set by someone else, and it is smaller than most people assume. Apple's own page for the App Store Small Business Program describes a reduced commission rate of 15 percent on paid apps and Apple in-app purchases, for developers whose proceeds were up to 1 million US dollars in the prior calendar year, and for developers new to the App Store. You have to enrol and accept the current paid apps agreement, so it is not automatic. Pass a million dollars in proceeds and Apple says the standard commission rate applies to future sales. For a first app, price as though you keep 85 cents on the dollar.

Apple, App Store Small Business Program

There are five shapes, and picking one rules out the rest

Money reaches you from an app in a small number of ways. A subscription to a tool for one specific job. A one-time purchase for a utility that does one thing well. A slice of a transaction that was going to happen anyway, like a booking or an order. Advertising. Or a business paying you directly because the app saves its staff an hour a day. Nearly every entry on a list of money making app concepts is one of those five in a costume.

Ads are the shape beginners pick and the one that punishes them hardest. Ad income scales with how many people open the app and how often, so apps that earn revenue from advertising need a crowd before the money covers the work. We have not printed a revenue per thousand impressions figure here, because we could not verify one today for any specific app category, and the ranges in circulation are guesses dressed as data. Treat ads as a volume business you are not in yet.

The underrated shape is the slice of a transaction that already happens. A booking tool for a gym that takes bookings by text is not creating demand. The money is already moving and you are making the movement cheaper, which is a much easier sale than a new habit. That is why the strongest app ideas for a side hustle look like plumbing for a business with customers rather than a consumer product.

The shortest path to revenue is usually the least glamorous one: one business, one invoice, one job it currently pays a person to do by hand. One customer at a few hundred dollars a month beats a hundred consumer subscriptions won one at a time, and it tells you within a fortnight whether the idea is real.

What the stores keep, and the rules that end two plans

Google Play publishes its service fees, and they changed during 2026. For transactions with users in Australia, the European Economic Area, Japan, the United Kingdom and the United States, the first 1 million US dollars of a developer's annual earnings carries a 10 percent service fee plus a 5 percent billing fee when the purchase goes through Play's billing. Above that, the standard rate is 10 percent plus the billing fee on auto renewing subscriptions, 20 percent plus the billing fee on other transactions from installs made after the regional rollout date, and 25 percent plus the billing fee on other transactions from installs made before it. Those rollout dates were 30 June 2026 for the EEA, UK and US, and 30 September 2026 for Australia and Japan. In the remaining markets the older structure still applies: 15 percent on the first million each year, 30 percent above it, and 15 percent on auto renewing subscriptions whatever you earn.

So a small developer gives up roughly 15 percent on both stores, not 30. That changes the arithmetic on cheap subscriptions. A 5 dollar subscription leaves about 4.25 before tax, so the gap between charging 5 and charging 8 is not 3 dollars, it is 2.55 per customer per month, forever. It also means a booking for a real world service is the cheapest shape of all, because Apple's guidelines require purchases of physical goods and services consumed outside the app to use something other than in-app purchase, which puts that money outside the commission.

Two App Review rules end popular money making plans before they start. Rule 4.2.6 says an app "created from a commercialized template or app generation service" is rejected unless it is submitted directly by the provider of the app's content. So the plan where you build apps for local businesses and publish them all from your own account does not work: the client publishes under their own account, and you get paid for the build. The rule is about who submits and whose content it is. It says nothing about how the code was written. Rule 4.2.2 is the other one, and it says apps, catalogs aside, should not be primarily "marketing materials, advertisements, web clippings, content aggregators" or a collection of links, which describes most of what the phrase turn my website into an app means in practice.

Google Play Console Help, service fees

The honest answer splits by what you already have

Two readers ask this question and they need opposite advice. The first has no audience and no particular access: no trade, no group, no client list. For that reader the first job is not an idea at all, it is access. Pick a group you can be useful to, spend a month inside it, and the paying problem gets named for you by the third conversation. A page of profitable app ideas in your notes is worth less than one group of people who take your calls.

The second reader already has something: a newsletter, a shop, a client list, or a job in an industry with a well known irritation. For that reader the paying idea is nearly always an extension of what exists, and the app is a feature of the business rather than a business of its own. The question stops being which idea and becomes whether an app is the right shape at all, which is the argument in is an app a good side hustle.

Then the uncomfortable half. For most people asking which app ideas make money, the answer about the specific idea in their head is usually no, at least not on its own and not from store browsing. Consumer apps without an audience mostly earn nothing, not because they are bad but because nobody arrives. Keep the idea anyway if you like it, and be honest that the money question is really a question about reaching the people who would pay, which is a separate discipline with its own page.