08 · Build & Deploy

Custom Mobile Apps: 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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Published

System Architecture

How your app gets built and shipped

One Flutter codebase becomes a native iOS and Android app, wired to your backend and tools, then published to both stores — in days, not months.

Stage 1 · Discovery & Scopenowireframes

A direct discovery call defines the core features, users, integrations, and target stores — then we go straight to build, no wireframe overhead, drawing on 15 years of shipping apps.

Discovery callBrand assets

ROI Calculator

Calculate what you save versus an app agency

Agencies quote $20k–$50k and months of work for a comparable app. Estimate the first-year difference when we build it with Flutter and AI-assisted development.

Typical agency quote for this app$35,000

Agency maintenance / month$1,500

First-year cost saving vs an agency$44,600

Build cost saved$29,000

Your build cost$6,000

Agency first-year total$53,000

You pay (first year)$8,400

Based on typical US/UK agency pricing of $20k–$50k for a comparable app. We build with Flutter + AI-assisted development in days, not months.

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 you get

What we build

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

Your 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.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

Apps 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.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

One codebase, two platforms. iOS and Android from a single build, native performance, published to both stores.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

A 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.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

Apps 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

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

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.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

Exactly what we will build, what technology, when it is delivered, and what it costs. No vague estimates.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

Drop your logo, brand colours, content, and any tool access into a shared folder.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

Progress update every 3 days. No silence, no chasing.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

We invite you to TestFlight (iOS) and Google Play Internal Testing (Android) so you use the real app before it goes live.

Custom iOS & Android App Development (Built in Days) | Twenty4Seven.us

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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