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How Much Does It Cost to Build an App? Agency, Freelancer, No-Code and AI Compared

What drives the cost of building an app, how agencies, freelancers, no-code, AI app builders and DIY coding compare, and the running costs after launch.

Mythex Team · 2026-09-29 · 7 min read

The cost of building an app depends far more on who builds it and how much it has to do than on any fixed price list. A simple web app built with an AI app builder or no-code tool can cost a monthly subscription plus your own time; the same app built by an agency is a project priced in weeks of skilled labour. After launch, every option also has running costs: hosting, a database, a domain, email and payment fees.

This guide explains what drives the cost, compares the five common ways to build, and lists the running costs people forget to budget for.

What actually drives the cost of an app

Whoever builds it, the price comes down to how much work there is. These are the things that add work:

• Number of screens and flows. A form and a list is a day's work for a developer. A product with onboarding, a dashboard, settings, admin tools and reports is many weeks.
• User roles and permissions. One kind of user is simple. Customers, staff, managers and admins, each seeing different data, multiply the logic and the testing.
• Integrations. Every outside service — payments, email, calendars, maps, an accounting tool, an AI model — adds setup, error handling and testing.
• Platforms. A web app runs everywhere with one codebase. Native iOS and Android apps usually mean more code, app store accounts and review cycles. See native vs progressive web apps.
• Design polish. Using a clean, standard look is cheap. Custom illustration, animation and a brand system cost designer time.
• Data and compliance. Health, finance or children's data can bring legal requirements, audits and extra security work.
• Unclear requirements. The most expensive driver of all. Changing your mind halfway through is paid for twice.

The practical lesson: the cheapest app is the one with the smallest first version. Deciding what to leave out saves more money than negotiating a rate. What an MVP is covers how to cut scope.

The five ways to build, compared

Agency

An agency gives you a team: a project manager, designer, developers and often a tester. You pay for all of their time, including meetings, planning and handover. That is why agency work is the most expensive route — and also why it can be the right one when a business needs a polished product, a fixed deadline and someone accountable for delivery.

What changes the price: team location and seniority, the number of platforms, how detailed your specification is, and whether ongoing maintenance is included. Ask for quotes broken down by feature so you can cut features rather than quality.

Freelancer

A freelance developer costs less than an agency because you are paying for one person, not a team and its overheads. The catch is that you take on the project management: writing the spec, answering questions quickly, testing each delivery and deciding what "done" means.

Rates vary enormously by country and experience, so we won't quote a range. For a sense of what full-time developer time is worth, the US Bureau of Labor Statistics reports a median annual wage for software developers of $135,980 as of May 2025 (BLS Occupational Outlook Handbook, checked September 2026). Freelance and agency rates build on top of that kind of salary cost.

No-code builder

Visual no-code tools such as Bubble, Softr or Glide let you assemble an app from building blocks without writing code. You pay a monthly subscription, and plans are often priced by the number of users, records, workflows or app editors, so costs rise as the app grows. The main costs are your time learning the tool, and the risk of being tied to it: many no-code platforms don't let you export working code. No-code vs AI app builders compares the two approaches.

AI app builder

With an AI app builder you describe the app in plain language and the AI writes, runs and publishes the code. The cost is a subscription and usage — typically credits spent as the AI works and, on some platforms, as your app runs. There is no hourly rate, so the cost is closer to a software subscription than a project fee.

What changes the price: how many rounds of changes you ask for (a vague prompt that needs five fixes costs more than a precise one), whether hosting and databases are billed on the same plan, and whether you need paid extras such as a custom domain. The hidden cost is your time: you still decide what to build, test it and check it is secure. How to build an app with AI walks through that process.

DIY coding

Writing the code yourself costs the least in cash — hosting and a domain can be all you pay — and the most in time. If you are already a developer, this may be the right choice. If you are learning, expect a long first project, and budget for the time spent on login, security, deployment and backups, not just features.

How to estimate your own budget

A rough, honest estimate takes an hour:

1. List the screens. Every page a user can see, including login, settings and error states.
2. List the roles. Who uses it and what each can see or change.
3. List the integrations. Payments, email, calendars, AI, anything outside the app.
4. Mark each item "must have now" or "later". Only "now" goes in the first budget.
5. Get two or three quotes, or build a prototype first. A clickable prototype built with an AI builder is also a good brief for a freelancer or agency if you later hire one.

If the idea is still untested, spend on validation before development. How to validate an app idea covers cheap ways to check demand first.

Running costs after launch

Building is a one-off cost. Running the app is monthly, and it is where small budgets get surprised.

Payment fees

Payment processors take a cut of each sale. Stripe's standard rate in the US is 2.9% + 30¢ per successful domestic card charge, with extra fees for international cards and currency conversion (Stripe pricing, as of September 2026; rates differ by country, so check the page for yours). On a $10 subscription that fixed 30¢ matters more than the percentage, which is one reason very cheap plans are hard to run profitably. Our guide to pricing a SaaS product covers this.

Usage-based APIs

If your app calls an AI model, every request costs money, and heavy users cost more than light ones. Put limits in place before launch, and make sure your pricing covers your heaviest realistic user.

Maintenance

Software doesn't stay finished. Libraries get security updates, browsers change, and users ask for fixes. With an agency or freelancer this is often a retainer or hourly work. With an AI builder or DIY, it is your time plus the same subscription.

Ways to keep the cost down

• Build a web app first. One codebase works on desktop and phone. Go native only when you have a reason.
• Cut the first version hard. One core job, done well. Add features when users ask for them.
• Use services instead of building them. Stripe for payments, an email provider for email, an existing login system for accounts.
• Choose hosting that sleeps when idle. A small app that scales down when nobody is using it costs much less than an always-on server.
• Keep the code portable. If you can export the code, you can move to a developer or another host later without starting again.

What building with Mythex costs

Mythex is an AI app builder, and its pricing is public on the pricing page. As of September 2026:

• Free — $0, with 10 credits a day (up to 30 a month). You can build, preview and publish; the code editor is read-only.
• Pro — $25 a month or $250 a year, with 100 credits a month plus 5 a day (up to 50 extra a month). It adds full code editing, export and GitHub sync, custom domains, and extra credits at $15 for 50.

One credit balance pays for both building with the AI and running your published app — hosting, database, bandwidth and file storage — and Pro pays half the Free rate for running costs. Databases sleep after a few idle minutes and are charged for the time they were awake. Domain registration, payment processing (for example Stripe) and email providers are billed separately by those services. The credits page in the docs explains exactly what is charged and when.

If you'd like to see how far a subscription gets you before paying anyone by the hour, start from one of the templates and build the smallest version that someone would use.