What you're actually building when you create a mobile app for your website
A mobile app for your website is not a copy of your website squeezed onto a phone screen. It's a separate piece of software that lives on someone's phone and talks to your website's servers in the background. When someone opens the app, they see a custom-built interface designed for touch and small screens — not a shrunken web page. The app can work offline, send notifications, and access phone features like the camera or location that a website cannot.
The core decision you face is whether to build one app that works on both iPhone and Android, or build separate apps for each. A cross-platform app uses one codebase (usually written in React Native, Flutter, or similar tools) and runs on both systems with minimal changes. A native app is written separately for iOS or Android and tends to perform faster and feel more natural on each phone, but costs roughly twice as much because you're paying two development teams.
Most small businesses and startups choose cross-platform first because the cost is lower and the app reaches both phone types when ready. Larger companies or apps that need maximum performance often go native, or start with cross-platform and rebuild in native code later if the app becomes popular.
Key Takeaways
- A mobile app is separate software that connects to your website's servers, not a mobile version of your website itself.
- Cross-platform apps (React Native, Flutter) cost less and work on iPhone and Android from one codebase, but native apps perform faster and feel more natural on each phone type.
- You need a developer or development team with experience in your chosen platform, and the project typically takes three to six months for a basic app.
- Your website's backend (the servers and databases) must be set up to send data to the app through an API, which is a technical bridge between the app and your data.
- App stores (Apple App Store and Google Play) review and approve apps before they go live, a process that takes one to two weeks and has specific rules you must follow.
Choosing between cross-platform and native development
Cross-platform frameworks like React Native and Flutter let you write the app once and deploy it to both iPhone and Android. React Native uses JavaScript, a language many web developers already know. Flutter uses Dart and is newer but has been gaining popularity because apps built with it tend to run faster than React Native apps. Both frameworks share roughly 70 to 80 percent of code between platforms, meaning you're not duplicating work.
The trade-off is that cross-platform apps sometimes feel slightly less smooth than native apps, especially during complex animations or when the app needs to access unusual phone features. For most business apps — ordering systems, customer portals, booking tools — users won't notice the difference. For games, photo editors, or apps that rely heavily on phone hardware, native development usually produces a better experience.
Native development means hiring separate iOS developers (who write in Swift) and Android developers (who write in Kotlin or Java). You're essentially building two apps. This costs more upfront but gives you maximum control and the best possible performance on each platform. Some companies build a cross-platform MVP (minimum viable product) first to test the idea, then rebuild in native code once they know the app will be used.
Setting up your website's backend to feed data to the app
Your app needs a way to get information from your website's servers and send information back. This connection happens through an API — an process Programming Interface. Think of an API as a waiter: the app (customer) asks the API (waiter) for data, and the API retrieves it from your website's database (kitchen) and brings it back.
If your website already has a backend — a server that stores customer accounts, product listings, or transaction history — you may already have the pieces in place. A developer will need to build or expand the API so the app can request specific data in a format it understands (usually JSON, a straightforward text format). This is not the same as making your website mobile-friendly; it's creating a data pipeline specifically for the app.
If your website is built on a platform like Shopify, WordPress, or Squarespace, those platforms often have built-in APIs or plugins that let apps connect without major rebuilding. If your website is custom-built, your original developer may need to add API endpoints — specific URLs the app can call to get or send data. This work typically takes two to four weeks depending on how complex your data structure is.
Finding and hiring a developer or development team
You have three main routes: hire a freelancer, hire a small agency, or hire an in-house developer. Freelancers on platforms like Upwork or Toptal are cheapest but require you to manage the project closely and may disappear if problems arise. Small agencies (three to ten people) cost more but handle the full project, manage timelines, and stay around to fix bugs. In-house developers are most expensive but give you someone who understands your business long-term.
When you interview a developer, ask specifically about their experience with your chosen platform (React Native, Flutter, native iOS, or native Android). Ask to see previous apps they've built and request references from past clients. A good developer will ask you detailed questions about your users, what the app needs to do, and what your website's current setup looks like. If they quote a price when ready without asking questions, that's a warning sign.
Expect to pay anywhere from $15,000 to $50,000 for a basic app with core features (user login, viewing content, basic transactions). More complex apps with custom features, offline functionality, or heavy use of phone hardware cost $50,000 to $150,000 or more. Timeline is usually three to six months for a first version, depending on complexity.
The app store review process and what it means for your launch
Before your app reaches users, it must be reviewed and approved by Apple (for the App Store) and Google (for Google Play). This is not optional — you cannot distribute an app any other way on these platforms. Apple's review typically takes three to five business days. Google's review is usually faster, sometimes one to two days, but can take longer if Google flags potential issues.
Both companies have strict rules. Apps cannot crash, cannot collect data without permission, cannot mislead users about what they do, and cannot contain certain types of content. Apple is generally stricter than Google. If your app is rejected, you get a reason and can resubmit after fixing the problem. Rejections are common on the first submission — expect at least one round of fixes.
This means you should plan for your app to be ready two to three weeks before you want to launch publicly. Submit to the app stores, wait for approval, fix any rejections, resubmit, and then announce the launch once both stores have approved. During this waiting period, you can prepare marketing materials, train your team, and set up customer support for app-specific questions.
Connecting the app to your existing website and customer data
Once the app is live, users will have accounts on both your website and your app. You need to decide whether these are the same account or separate. Most businesses use the same account — a customer logs in with their email and password on both the website and the app, and they see the same order history, saved items, and preferences on both.
This requires your backend to recognize whether a login request came from the website or the app and serve the same data either way. A developer handles this by using find tokens — small pieces of encrypted information that prove a user is who they claim to be. The app stores this token locally and sends it with every request to your servers.
You'll also need to decide what features live on the app versus the website. Some companies put everything on both. Others reserve certain features for the app (like push notifications or offline browsing) to encourage people to use it. This is a business decision, not a technical one, but your developer needs to know your plan before they start building.
Maintaining and updating your app after launch
An app is not finished when it launches. Operating systems update (iOS and Android release new versions every year), phones get new hardware, and users find bugs you didn't catch. You'll need to budget for ongoing maintenance — typically five to fifteen hours per month for a basic app, more if you're adding new features regularly.
When Apple or Google releases a new OS version, you must test your app on it and submit an update to the app stores if anything breaks. This usually takes a few weeks and costs money if you're paying a developer. If you don't update, your app may stop working for users with the newest phones, and the app stores may remove it.
You should also plan for feature updates. Users will request new functionality, competitors will add features you want to match, and your business will evolve. A realistic budget is to set aside money for one major update per year and several small bug-fix updates. Without this, your app will feel stale and users will uninstall it.
Frequently Asked Questions
Can I turn my website into an app without rebuilding it?
Not really. You can wrap your website in a thin app shell that loads your website inside it, but that's not a true app — it's just a website in a phone-shaped window. Users will notice it's slow, it won't work offline, and it won't feel like a real app. A proper app requires a separate codebase and a backend API. Some companies do this as a first step to test the idea, then build a real app later.
How much does it cost to maintain an app after launch?
Maintenance typically costs $500 to $2,000 per month depending on how much work is needed. This covers bug fixes, OS updates, security patches, and small feature additions. If you want major new features, that's separate and costs more. Some developers offer maintenance packages; others charge hourly. Budget for at least $6,000 to $24,000 per year.
Do I need both an iOS and Android app, or can I just pick one?
You can pick one, but you'll reach fewer people. About 25 to 30 percent of smartphone users in the US use Android exclusively, and about 65 to 70 percent use iPhone. Globally, Android is more common. If your customers are mostly in the US and tend to be higher income, iPhone-first makes sense. If you want maximum reach, build for both. Cross-platform development makes this affordable.
What happens if my app gets bad reviews in the app store?
Bad reviews hurt visibility — the app stores show average ratings prominently, and apps with low ratings get recommended less often. You can respond to reviews publicly, which shows you care. The best defense is to fix bugs quickly and push updates regularly. If you get a wave of bad reviews about a specific problem, fix it and release an update within a week. Users who had problems often return to update their review if you fix the issue.
Can I build an app without hiring a developer?
No-code app builders like Flutterflow, Bubble, or AppGyver let you build straightforward apps without writing code, but they have significant limits. They work best for very basic apps — a directory, a straightforward booking tool, or a content viewer. They're slower, less flexible, and more expensive at scale than hiring a developer. For anything beyond basic, you need a real developer or development team.