Twenty4Seven
Free AI Audit
08 · Build & Deploy

Your Business Deserves Its Own App. We Build It in Days — Not Months.

We build custom mobile apps for iOS and Android — branded business apps, AI-powered tools, and utility products. Published to the App Store and Google Play. Maintained by us every month. You never touch a line of code.

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Two problems stop most businesses building an app

Time. The traditional way takes 3 to 6 months. By the time it launches, you have lost momentum and the market has shifted.

Cost. A simple branded app from a US or UK agency costs $20,000 to $50,000. Medium complexity, $50,000 to $100,000. For most growing businesses, that is not realistic.

We solve both. We build production-grade mobile apps in days using Flutter and AI-assisted development — faster and for less. Not because we cut corners. Because we build smarter.

What we build

Branded business appsYour business, your logo, on your customers’ phones. Gyms where members book classes, clinics where patients book appointments, restaurants with ordering and loyalty, coaches with client content and bookings.
AI-powered appsApps with AI built into the core — a customer service app where an AI agent answers instantly, a tool that analyses your data, a sales app that qualifies leads. Any AI capability we build can be wrapped inside a mobile app.
Flutter for full nativeOne codebase, two platforms. iOS and Android from a single build, native performance, published to both stores.
PWA for simpler needsA Progressive Web App looks and feels native — installable, offline-capable, push notifications — but built like a website. Faster to build, cheaper to maintain, no App Store submission required.
You own everythingApps publish under our developer accounts by default. Request full source code and ownership transfer to your own accounts at any time — no charge, no questions.

What it costs

Simple PWA$3,000–$5,000$150/mo · ~7 days
  • Installable web app
  • Offline + push notifications
  • No App Store submission needed
  • Faster, cheaper to maintain
Best for: The app experience without full native complexity.
Flutter App$6,000–$10,000$200/mo · ~14 days
  • Full native iOS + Android
  • Single codebase, native performance
  • Published to both stores
  • Custom design
Best for: A credible, full-featured native app.
AI-Powered Add-on+$5,000–$8,000+$150/mo · ~21 days
  • AI built into the core experience
  • Chatbots, data analysis, lead qualification
  • Powered by Google Gemini
  • On top of a base app
Best for: Apps where AI is the differentiator.

Every app is scoped individually after a discovery call. Developer account fees (Apple $99/yr, Google $25 one-time) are covered in the setup fee. 50% before start, 50% before App Store submission.

How it works

1
Discovery call
A 30–90 minute conversation — what the app does, who uses it, what it connects to, and what success looks like. That is all we need to scope accurately.
2
Proposal within 24 hours
Exactly what we will build, what technology, when it is delivered, and what it costs. No vague estimates.
3
You approve and pay 50%
Drop your logo, brand colours, content, and any tool access into a shared folder.
4
We build
Progress update every 3 days. No silence, no chasing.
5
You test it on your phone
We invite you to TestFlight (iOS) and Google Play Internal Testing (Android) so you use the real app before it goes live.
6
You pay the remaining 50% and it goes live
We submit immediately. Apple typically reviews in 1–3 days, Google in hours to a day. You get the live links the moment it is approved.

Frequently asked questions

What is the difference between a PWA and a Flutter app?
A Flutter app is a full native app on the App Store and Google Play with native performance. A PWA is a website that behaves like an app — installable, offline, push notifications — but does not go through the stores. Flutter is more powerful and credible; PWAs are faster and cheaper. We recommend the right one on the call.
Do I need my own Apple and Google developer accounts?
No. We publish under our accounts on your behalf and cover both fees (Apple $99/yr, Google $25 one-time). You can transfer to your own accounts anytime at no charge.
Can you build an app that connects to my CRM or booking system?
Yes — as long as the tool has an API. We integrate with HubSpot, Salesforce, GoHighLevel, Xero, QuickBooks, Calendly, Stripe, and most standard business tools.
Do you build games?
No. We build business apps, utility apps, and AI-powered apps. Game development is a different discipline we do not offer.
How long does it take?
Simple PWA ~7 days, simple Flutter app ~14 days, AI-powered app ~21 days. We give a specific delivery date in the proposal.
What if Apple or Google rejects the app?
We handle it. One round of rejection fixes is included — we read the feedback, make the changes, and resubmit. Significant new development beyond scope is agreed first.
Can I transfer the app to my own developer accounts?
Yes — anytime, at no charge. We transfer everything and hand over full source code and documentation. You own your app completely.
Agent online — 24/7

Ready to see Custom Mobile Apps working on your business?

Ask our agent anything — what it does, what it costs, whether it fits your business. It answers instantly and books your discovery session directly. No form, no waiting.

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