You can build a basic app for free using no-code platforms, but the route depends on what your app needs to do
Free app development tools fall into three categories: no-code builders that let you drag and drop features together, open-source frameworks that require coding knowledge but cost nothing, and freemium platforms that offer a free tier with limits. No-code is fastest if you want something working in days. Open-source is cheapest long-term if you know how to code or are willing to learn. Freemium works if your app stays small — most hit a ceiling where you need to pay to add users or features.
The catch: free tools almost always limit what you can build. A no-code platform might not let you create a real-time multiplayer game. An open-source framework gives you total control but requires you to host the app yourself, which eventually costs money. Freemium platforms let you build for free but charge when you want to publish to the app store or add paying users.
Key Takeaways
- No-code platforms like Flutterflow and Adalo let you build working apps without writing code, though they charge money once you want to publish or add users beyond a small free tier.
- Open-source frameworks like React Native and Flutter are free forever but require you to learn coding and handle hosting, which costs money as your app grows.
- Freemium platforms offer free development but charge when you exceed free tier limits — usually around 100 to 1,000 monthly users depending on the platform.
- Publishing to the Apple App Store or Google Play Store costs money (Apple charges $99 per year; Google charges $25 once), even if you built the app for free.
- Most free tools are best for learning, prototypes, or small projects — serious apps eventually need paid hosting, premium features, or a developer's time.
No-code platforms: build without writing code
No-code app builders let you create a working app by clicking and dragging. You choose a template, add screens, connect buttons to actions, and publish. Popular free or freemium options include Flutterflow, Adalo, Bubble, and MIT App Inventor. MIT App Inventor is completely free and open-source. Flutterflow and Adalo offer free tiers that let you build and test on your phone, but charge to publish to the app stores.
The trade-off is flexibility. No-code platforms work well for simple apps: a to-do list, a calculator, a basic social feed, a local business directory. They struggle with complex logic, real-time features, or apps that need to handle thousands of users at once. If your idea is straightforward, no-code is the fastest path from idea to working app.
Most no-code platforms charge money once you want to publish. Flutterflow's free tier lets you build and test, but publishing to iOS or Android costs $15 to $50 per month depending on features. Adalo charges $50 per month to publish. Bubble charges based on how many users visit your app. MIT App Inventor stays free because it's built by MIT and funded by grants, not venture capital.
Open-source frameworks: free but requires coding
Open-source frameworks are free tools that professional developers use. The most popular are React Native (owned by Meta), Flutter (owned by Google), and Kotlin (owned by Google). All three are completely free and let you build apps that work on both iPhone and Android from a single codebase. You write code, not click buttons.
The barrier is learning to code. React Native uses JavaScript, Flutter uses Dart, and Kotlin uses Kotlin — all are programming languages you have to learn. If you already know how to code or are willing to spend weeks learning, open-source frameworks are powerful and cost nothing. If you don't code, you'll need to hire a developer or spend significant time learning.
The hidden cost is hosting. Open-source frameworks are free to use, but your app needs to run somewhere. A simple app might use Firebase (Google's backend service), which offers a free tier for small projects but charges once you exceed it. A more complex app needs a server, which costs $5 to $50 per month depending on traffic. For a serious app, expect to pay for hosting eventually.
Freemium platforms: free to start, paid as you grow
Freemium platforms let you build and publish for free, then charge once you hit limits. Firebase, AWS Amplify, and Heroku all work this way. You can build a working app and publish it to the app stores without spending money, but the free tier has caps: usually 100 to 1,000 monthly active users, limited data storage, or limited server power.
This model works well if you're testing an idea or building something small. You pay nothing until your app actually has users. The problem is the jump from free to paid can be steep. Firebase's free tier covers about 100 concurrent users; beyond that, costs climb quickly. Heroku's free tier disappeared in 2022, so apps that relied on it had to move or start paying.
Freemium is honest about costs: you know upfront what the limits are and what you'll pay to exceed them. It's a good choice if you want to test whether your app idea works before spending money, or if you're building something that will always stay small.
What it costs to publish to app stores
Even if you build your app for free, publishing to the app stores costs money. Apple charges $99 per year for a developer account, which lets you publish to the iPhone App Store. Google charges $25 once for a developer account, which lets you publish to Google Play. You pay these fees whether your app is free to download or charges money.
You also need a computer that meets the platform's requirements. To publish to iPhone, you need a Mac (or a virtual Mac, which costs money). To publish to Android, you can use Windows, Mac, or Linux. If you don't own the right computer, that's an additional cost.
Some developers skip the app stores entirely and build web apps instead. A web app runs in a browser and doesn't require publishing to Apple or Google. You can build a web app for free using open-source frameworks or no-code platforms, and publish it to a free hosting service like GitHub Pages or Netlify. The trade-off is that web apps can't access some phone features (like the camera or contacts) as easily as native apps can.
Learning resources that are free
If you want to learn to code and build with open-source frameworks, several free resources exist. Codecademy, freeCodeCamp, and Khan Academy all teach JavaScript, which is the foundation for React Native. Google's Flutter documentation includes free tutorials. YouTube has thousands of free coding tutorials, though quality varies widely.
The time investment is real. Learning to code well enough to build an app takes weeks to months of consistent practice, not hours. If you're serious about app development, budget time for learning before you expect to build something complex.
Comparing the routes
| Route | Cost to build | Cost to publish | Time to first working app | Best for |
|---|---|---|---|---|
| No-code (MIT App Inventor) | Free | Free (Android only) | Days to weeks | Learning, simple apps, Android only |
| No-code (Flutterflow, Adalo) | Free to build | $15–$50/month | Days to weeks | Prototypes, small projects, both platforms |
| Open-source (React Native, Flutter) | Free | $99 (Apple) + $25 (Google) | Weeks to months | Serious projects, developers who know code |
| Freemium (Firebase, AWS) | Free to start | $99 (Apple) + $25 (Google) | Weeks to months | Testing ideas, apps with small user bases |
| Web app (open-source) | Free | Free (GitHub Pages, Netlify) | Weeks to months | Learning, no app store fees, browser-based |
Frequently Asked Questions
Can I really build an app for completely free?
Yes, but with limits. MIT App Inventor is free forever and lets you build and publish Android apps without paying. Open-source frameworks like Flutter are free, though you'll eventually pay for hosting. Most other free tools charge once you want to publish or add users. A web app can be built and hosted completely free using open-source tools and free hosting services.
Which free tool is easiest to start with?
MIT App Inventor or Flutterflow if you don't know how to code. Both use visual builders where you drag and drop features. MIT App Inventor is completely free but only publishes to Android. Flutterflow is free to build but charges to publish to both iPhone and Android. If you want to learn coding, start with freeCodeCamp's JavaScript course, then move to React Native or Flutter.
Do I need to know how to code to build an app?
No, not with no-code platforms. MIT App Inventor, Flutterflow, and Adalo all let you build without writing code. You will hit limits on what you can build, but for simple apps, no-code is enough. If you want to build complex apps or have total control, learning to code is necessary.
What happens when my free tier runs out of users?
It depends on the platform. Some platforms (like Freemium services) simply stop working until you pay. Others (like Firebase) charge based on what you use. Before you pick a platform, read the pricing page to understand what happens when you exceed the free tier. Some platforms charge per user, others charge per data request, and others charge per server hour.
Can I build an app for free and sell it later?
Yes. You can build using free tools, publish for free, and then charge money for the app or for features inside it. The app store fees (Apple's $99 per year, Google's $25 once) are separate from what you charge users. If you use a freemium backend like Firebase, you'll pay for hosting based on how many users you have, not on how much money the app makes.