Hidden Costs of Building an App: A Startup Founder's Budget Guide

Most app budgets don't fail because development costs too much. They fail because the founder spends the whole budget on code and has nothing left for launch, users and upkeep. If you have $100K, plan to spend about half of it on development, and the rest on everything this article lists.

Ever since the garage and basement success stories became famous — Google, Facebook, Uber, WhatsApp, Airbnb and many others — everyone aspires to build the next app that becomes the next Uber. If you are reading this, you probably have an idea for one. If the idea is pursued and executed well, it has a good chance of success.

We often get calls from aspiring tech entrepreneurs about building new apps or new products. As a software development firm, we see the same assumptions again and again in how founders think about app development. Here are the hidden costs people are often unaware of, and how to plan for them. If some of the terms below are new to you, start with our terminology guide for founders.

5 assumptions that derail startup budgets

• "The app can be built in 6 months." This is the most common assumption: that anything can be built in 6 months. To a founder, 6 months sounds like enough time to build another Google or Facebook. Instead: cut the first version down to the one problem it solves. A focused MVP often can be built in that time; a full product with everything on your wish list can't.
• "The app can be built on a $10-20K budget." You'll find estimates online that say apps like Tinder can be built for $40K, WhatsApp for $60-70K and Uber for less than $100K. Ask yourself whether the flagship product of a company aiming for a billion-dollar valuation can be built for less than $100K. Instead: budget from a real estimate for a defined scope. For reference, the custom MVPs we build start at around $30,000 with our US team, and go up with scope.
• "A mobile app is like a website." What a website was in 2000-2010 is what a mobile app is today, and from the end user's point of view that's fair. Technically, though, building and maintaining a mobile app costs more than a website. Instead: choose the cheapest platform that tests your idea. One cross-platform codebase, built with .NET MAUI or React Native, can serve both iOS and Android, and for many first versions a web app or progressive web app (PWA) is cheaper than a store app and good enough.
• "A single developer can build the app." This is like assuming a handyman can build your house. He can, but would you want to live in it? And if you were building a hotel, would you hire the handyman? A single freelancer can build an app, but a product people pay for needs design, development, testing, cloud and product skills, and one person rarely has all of them. Instead: check who covers each of those roles, whether you hire freelancers or a mobile app development company.
• Updated 2026 "AI coding tools mean I barely need developers." AI assistants do make developers faster, and a founder can build a clickable demo with them. But a product that real users trust with their data still needs someone who designs the architecture, reviews the code, secures it, tests it and keeps it running. Instead: use AI tools to test your idea cheaply, and budget for a team to build the product.

Start with an MVP

The best way to control all the costs below is to build less first. A minimum viable product (MVP) is the smallest version of your app that covers one core workflow for one group of users, so you learn whether they'll use it, and pay for it, before you spend the rest of your budget.

• Validate before you build. Talk to potential users, and if you can, show them a clickable prototype before you write production code.
• Pay for discovery first. Before you get an estimate you can trust, a development partner should give you wireframes, a requirements document or a clear in-scope/out-of-scope list, an estimate and a high-level project plan.
• Pick one platform, or a web app, for version one, unless your users really are split between iOS and Android.
• Write down what you're leaving out. Every feature you move to version two is money kept for marketing and for fixes after launch.

Our MVP development page explains how we work with founders on a first version. The Hygieia case study follows a healthcare startup's product, a diabetic patient management system, from idea to launch; in its founder's words:

"SharpQuest's development expertise is so extensive that they can deliver exactly what I want." — Founder · Hygieia

Not sure what your MVP should include? Tell us about your idea and book a call with us to scope it.

Costs you expect

These are the costs most founders already know about, or know to research:

• Development — the designers, developers and testers who build the product.
• Publishing — Apple and Google fees to publish the mobile app. The Apple Developer Program is $99 a year and a Google Play developer account is a one-time $25. If you sell subscriptions or digital goods inside the app, the stores also keep a commission (15-30%; see Apple's Small Business Program and Google Play's service fees), which belongs in your pricing model, not just your budget. If you take payments outside the app stores, the payment processor also charges a fee on every transaction.
• UI/UX design — a professional designer needs to design the app or product interface.
• Hosting — the product needs a back-end database and API. It needs to be hosted somewhere, and today that's the cloud (Azure or AWS, for example).
• Maintenance — ongoing bug fixing and keeping the product up and running needs a technical team. Apple and Google release new versions of iOS and Android every year, and the stores require apps to keep up, so even an app with no new features needs some development every year. Plan for about 15-20% of your budget for maintenance in the first year after launch.

Costs founders often miss

Here is a list of the other items you need to take care of before, and after, your product launches.

Before you build

• Product name — domain reservation and social media registration. This can be as little as $20 a year if your domain is available. Otherwise you may have to spend thousands, or more, at a domain auction. Check that your name is free on the social networks you need before you spend money on marketing.
• Logo design. Do this before you start building the product. You can use Fiverr for cheaper logos or go to professionals and spend hundreds. Don't spend thousands on this unless you have venture backing.
• Website or landing page — design, development, hosting. This is also a must if you are serious about your app. For low costs, use WordPress.com or Wix, and make sure it has a blog. Put a waitlist sign-up on it: the emails you collect are your first pilot users.
• Email hosting. You need email on your product's or company's domain. Microsoft 365 and Google Workspace both offer it. A serious founder shouldn't contact development companies, investors and other vendors from a free email account. It comes across as unprofessional.
• Legal costs. If you are building a product, you want to own the rights to your intellectual property. You also want a mutual non-disclosure agreement (NDA) with your vendors, and a contract that sets out the intellectual property and how you get the source code, agreed before work starts. If you are doing it yourself, look up LegalZoom; otherwise find a lawyer by visiting a few chamber of commerce meetings in your city.
• Privacy and compliance. Both app stores require a privacy policy, ask you to declare what data the app collects (Apple's app privacy details, Google Play's Data safety section), and Apple requires that users can delete their account from inside the app. If your app handles health data, plan for HIPAA from the start. If you sell to insurers, banks or larger companies, expect them to ask how you protect personal data, and some will ask for a security audit report such as SOC 2, which your company would have to obtain and pay for.

While you build

During development, the development company may present some costs you were not aware of before starting.

• Changes during development. Once founders see the app taking shape, they want to change it, and each "small" change adds time. A change made during development costs more than the same change made at planning, and many small ones are how a budget runs out. Agree in writing, before work starts, how changes are estimated and approved, and move anything that isn't essential to version two.
• Cloud hosting costs. Some development companies will ask you to pay for hosting before they start development. Ask for separate environments for development, testing and production.
• Third-party license costs. Your app may need third-party services like Google Maps or the Twilio text messaging service. Some of these cost good money, and most charge more as your user count grows.
• Updated 2026 AI usage costs. If your app uses AI, such as a chat assistant or reading documents, the AI provider charges for every request. It's small while you test and grows with every user, so ask for an estimate per active user before launch.
• QA and real-device testing. Testing is a cost of its own, not something developers fit in at the end. Your app needs to work on older phones, small screens and slow connections, not just the developer's phone.
• Security, analytics and crash reporting. Sign-in, data encryption, backups, and the tools that tell you how people use the app and when it crashes. They're cheap to add at the start and expensive to bolt on later.
• Test devices. Phones and tablets to test on, beyond the ones the team already has.
• Special hardware. If your product needs special hardware, like beacons or medical devices, developers will ask you to buy it for development and testing.
• Your own time. Someone has to own the product: answer the team's questions, decide what goes into each release, and test with users every week. If that's you, it's time you don't spend on sales or fundraising, so plan for it.

Many of these costs don't stop when development does. Also make sure the development company shuts down every service it used during development that you no longer need, otherwise your auto-pay for cloud services will keep paying.

After launch

This is the step when you go live, which means you need people to use the app. Don't distance yourself from the development team. You need them until you know whether the product is succeeding.

• Digital marketing and explainer videos. Your users need to see your product and try it out, and short videos that show how to use it help them get started.
• Finding pilot users. This is the toughest part, and it varies from product to product.
• Fixes and the second release. Your first users will find bugs and ask for changes. Keep budget, and the team, for the first months after launch.
• Support. Someone has to answer users' emails and app store reviews.

As you can see, there are many costs (not just money, but time) to make a product and put it in users' hands. Development is just a part of it. There are many products that were built and are gathering dust somewhere in the cloud, because they never reached the end user.

Keep your accounts in your name

The product is your company's main asset, and investors and buyers will check who controls it. From the first day:

• Register the domain, cloud subscription, app store developer accounts and third-party services in your company's name, and give the development team access, not the other way round.
• Agree in the contract how you get the source code and the designs, and where the code repository lives. At SharpQuest we're open to selling you the source code; the terms are set out in your contract, agreed before work starts.
• Keep a list of every account, who has access, and what it costs each month.

How to budget your MVP

If you have a $100K budget, keep about $50K for development, and don't spend 100% of it on development only. Here's how we'd split it for the first year:

Part of the budget	Share of $100K	What it covers
Discovery and design	~10%	Workshops, wireframes, prototype, requirements, estimate
MVP development and testing	~50%	Design, development, QA and real-device testing
Cloud, services and set-up	~5-10%	Hosting for every environment, third-party services, AI usage, app store accounts, monitoring
Legal, launch and marketing	~15%	Contracts, privacy policy, website, videos, marketing, pilot users
Maintenance in the first 12 months	~15-20%	Fixes, the second release, OS updates, support

Keep part of the launch budget unspent as a contingency: something always takes longer or costs more than planned.

The more of the app you can keep simple, the less it costs to run. When OnTheClock, a time-tracking product used by over 7,000 client companies and 25,000 users, needed its app on more devices, we rebuilt it cross-platform so one codebase served both iOS and Android, which reduced the ongoing maintenance cost.

What investors look for

If you plan to raise money, your app budget is part of your pitch. Investors usually want to see:

• A realistic runway that includes hosting, maintenance and marketing after launch, not just the build.
• An architecture that can grow with users without a rewrite.
• Code they can have reviewed. Technical due diligence is common before an investment or acquisition, so clean, documented code in a repository you control is worth paying for.

What to ask a development partner

The cheapest quote can become the most expensive choice. Clarus came to us after a previous vendor's infrastructure problems caused outages for its users; after our updates, its Android and iOS apps saw 5% and 10% more crash-free sessions, and monthly usage grew 30%.

The right partner keeps your launch on plan. CoreSRM, a startup with a supplier relationship management platform, rated us 5/5 for keeping to schedule and 5/5 for quality, and its CEO turned a three-month engagement into a lasting contract:

"Able to launch to market within planned budget and timing." — CEO · CoreSRM

Before you sign, ask:

• Who will work on my product: designers, developers, testers, and a technical lead I can talk to?
• What do I get from discovery, and what does the estimate include and leave out?
• How do you handle change requests: how are they estimated, and who approves them?
• Do you work fixed-price, by milestone or hourly? (Our How We Work page explains how we use each.)
• How do I get the source code, and whose name are the accounts in?
• What happens after launch: who fixes bugs, how fast, and what does support cost?
• Can I talk to a founder you've built a product for?

A founder's budget checklist

Before you sign with a development company, check you have a line for each of these:

Cost	Stage	One-time or recurring	Who should own it
Name, domain and social handles	Before you build	Recurring (yearly)	You
Logo and landing page with a waitlist	Before you build	One-time, then hosting	You
Business email	Before you build	Recurring	You
NDA, contract, privacy policy, terms	Before you build	Mostly one-time	You and your lawyer
Discovery and prototype	Before you build	One-time	Development partner
Design, development and QA	While you build	One-time per release	Development partner
Cloud hosting (development, test, production)	While you build	Recurring	You (account), partner (set-up)
Third-party services (maps, text messaging, email, payments)	While you build	Recurring, grows with users	You (account), partner (set-up)
AI usage	While you build	Recurring, grows with users	You (account), partner (set-up)
Test devices	While you build	One-time	You
Special hardware	While you build	One-time	You
App store accounts and commission	Launch	Recurring	You
Marketing and explainer videos	Launch	Recurring	You
Pilot users	Launch	One-time effort	You
Fixes, OS updates and support	After launch	Recurring (15-20% of the budget in year one)	Development partner
Your own time as product owner	Throughout	Recurring	You

Frequently asked questions

How much does it cost to build an MVP app?

It depends on what the first version has to do. The custom MVPs we build start at around $30,000 with our US team, and the price goes up with the number of screens, user types and integrations. Plan to spend roughly as much again on everything else: legal, hosting, marketing and the first year after launch.

How long does it take to build an MVP?

A focused MVP usually takes a few months or more (2+ months), after a discovery phase that defines exactly what's in and out. A full product with every feature on your list takes much longer. The surest way to shorten the timeline is to cut scope, not to add people.

Should I build for iOS, Android or the web first?

Build where your first users are. If they're split, a cross-platform app built with .NET MAUI or React Native covers both stores with one codebase. If you mainly need to test the idea, a web app or PWA is often the cheapest first version, with no app store review.

Do I need a technical co-founder?

Not to build the first version, but you do need someone you trust on the technical side: a co-founder, an advisor, or a development partner led by technical people who will tell you what not to build. Someone has to own the technical decisions after launch, too.

Who owns the code if I hire a development company?

That's set out in your contract, agreed before work starts. Make sure it covers the source code, the designs and the accounts (cloud, app store, domain), and sign an NDA before you share the details of your idea. We sign the client's NDA or use our own, and we're open to selling you the source code under the terms of the contract.

How much does it cost to maintain an app after launch?

Plan for about 15-20% of your budget in the first year after launch. That covers fixes, the updates Apple and Google require each year, and support, plus hosting and third-party services that grow with your users. We offer monthly support plans with a set number of hours; our How We Work page explains them.

Can AI tools build my app for less?

They can help you build a clickable demo or prototype cheaply, and they make developers faster. But for a product that real users trust with their data, you still need architecture, code review, security, testing and someone to keep it running.

What costs do founders forget most often?

Legal and privacy work, app store rules and commission, third-party services and AI usage that grow with every user, testing on real devices, the yearly iOS and Android updates, their own time, and the marketing budget to get the first users.

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Want a realistic, all-in budget for your app? Tell us about your idea and book a call with us. We'll help you work out what your MVP needs, what it's likely to cost, and what to keep for launch. We reply within two business days.