AP4 Digital
HU/EN
B2B mobile apps · Budapest · Since 2013 · AI-native

B2B mobile app development in 6–14 weeks, at a fixed price, live in the App Store.

AI-native mobile app development for iOS and Android: business-grade mobile applications from MVP to production systems, with secure AI support and scalable architecture.

  • 50+ delivered mobile apps · 13+ industries · senior-only team (8+ yrs each)
  • iOS + Android — native (Swift, Kotlin) or cross-platform (React Native, Flutter)
  • Private RAG — your data never enters public models, NDA on request
Booking.tsx
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AURORA RESORTS
Booking
♥
Santorini, Greece · 0.2 km to beach
Superior
★ 4.9
€140
/ night
Superior Room
★★★★★
(320)
Sea view · 28 m² · King bed
Wifi
Spa
Breakfast
Check-in
Jun 24
Check-out
Jun 26
2 nights · 2 guests
€140 × 2 nights
€280
Taxes & fees
€40
Total
€420
Confirm booking
BKK logoSimplePay by OTP logoÁrukereső.hu logoFashion Street logoEurop Assistance logoPraktiker logoSwiss Clinic logoMagyar Posta logoImperatore Travel World logoRekortan logoZalakaros logoMÉH Zrt. logoArtisjus logoFerro-Sped 2000 logoCool4U Solar logoanet360 logo
C
Independent reviews
Clutch
View profile →
What does it mean?
Q.

What is mobile app development for businesses?

Mobile app development for businesses (also known as enterprise mobile application development, B2B mobile app development or enterprise mobile development) is a service in which an expert team designs, builds and operates business-grade iOS and Android applications in an enterprise environment. A mobile app can be native (Swift / Kotlin) or cross-platform (React Native / Flutter), and typically breaks down into 3 phases: MVP (6–12 weeks), production release (12–26 weeks), and continuous iteration (in monthly to quarterly cycles). Unlike classic software development, mobile app development requires specific platform compatibility, App Store / Google Play compliance and performance optimization.

Service:B2B mobile app developmentPlatform:iOS · AndroidStack:Swift · Kotlin · RN · FlutterRegion:HU · EU
Free PDF · 12 pages

B2B mobile app development guide — 12 pages, free

Downloadable PDF: the key decisions of enterprise mobile app development — native vs cross-platform, MVP scope, tech stack selection, budgeting, App Store / Google Play submission, ASO basics, AI integration in B2B environments.

  • Native vs cross-platform decision matrix
  • MVP feature scope — what to leave out
  • Realistic budget ranges for 6 mobile app tiers
  • AI integration within enterprise security perimeters

Privacy: we only send this PDF. Unsubscribe anytime.

AP4 Digital2026 / Q2
Guide · 12 pages

B2B mobile app development in 2026

Native vs cross-platform · MVP scope · Tech stack · Budget · App Store · AI integration

ap4digital.com/en/mobile-app-developmentPDF · 2.4 MB
Specifically for whom

A mobile app is not for everyone.

A well-designed mobile app pays off when it strengthens the customer relationship or speeds up daily work. With bookings, orders, payments, status tracking, field data capture or push notifications, it is no longer just a digital surface — it becomes a tool that delivers business advantage.

Returning customers

When customers come back regularly

Bookings, loyalty programs, push, quick reordering — here an app drives retention and revenue.

  • Fitness · sports · padel
  • Restaurant · café · delivery
  • Hotel · tourism
  • Private clinic · education · e-commerce
Internal processes

Field work, warehouse, service

Work orders, photo upload, GPS, inventory, issue reporting, signatures — often pays back faster than a customer app.

  • Logistics · warehouse · freight
  • Construction · manufacturing · maintenance
  • Agriculture · field sales
  • Scheduling · customer relations
Marketplace / platform

Multiple actors, separate interfaces

Driver–passenger, coach–client, restaurant–courier–customer. When the model is multi-sided, a mobile app is often the only viable UX.

  • Professional–client marketplace
  • Landlord–tenant · sharing economy
  • Coach–client · education platform
  • Provider–customer portal
Push-native business

When you communicate regularly

Booking reminders, order status, promotions, expiry alerts. Here push is the only channel that reliably gets through.

  • Booking · order status
  • Promotions · coupons · loyalty
  • Expiry · service alerts
  • Documents · critical notifications
A simple decision rule

A mobile app is worth it if at least 3 are true of the following:

  • ✓Customers use it several times a month
  • ✓Login / personalization is required
  • ✓Push notifications are needed
  • ✓Booking · ordering · payment · status
  • ✓Camera · GPS · signature · offline
  • ✓Internal field work
  • ✓It directly generates revenue or cuts costs
When you may not need one

If you only need a brochure site, returning customers are rare, there is no booking or login, and the budget is limited — a responsive website or PWA is the better choice.

We'll tell you honestly on the 30-minute call — if the app won't pay off, we won't recommend it.

Services · 4 development paths

Native, cross-platform, web app or AI mobile app: which is the right choice?

One of the most important decisions in mobile app development is not the design — it is the technology. A premium customer app, a quickly validated MVP, an internal enterprise system and a mobile-friendly web app each call for a different solution. We help you pick the one of these four paths that makes sense for your business, your tech requirements and your budget.

01 · Native

Native iOS / Native Android

Separate native codebases in Swift / SwiftUI (iOS) and Kotlin / Jetpack Compose (Android). Maximum performance, every platform API available.

A good fit when: premium UX, offline-first, heavy camera/sensor use, AR, gaming
Not when: you need fast time-to-market on both platforms in parallel
Tech
SwiftSwiftUIKotlinJetpack ComposeStoreKitFCM
02 · Cross-platform
AP4 recommended

Cross-platform (React Native / Flutter)

iOS + Android from a single codebase. 30–50% faster time-to-market, ~60–70% code sharing. Extended with native modules where the UX demands it.

A good fit when: both platforms at once, medium-complexity UI, cost-efficient
Not when: extreme graphics performance, deep platform-specific features
Tech
React NativeFlutterTypeScriptExpoDartFirebase
03 · Web app

Mobile-optimized web app / PWA

Responsive web application, installable as a PWA on the home screen. Push notifications, offline cache. No App Store review, instant deployment.

A good fit when: internal tools, fast iteration, B2B portals, no store requirement
Not when: you need a native feel, deep hardware integration or App Store presence
Tech
ReactNext.jsPWAService WorkerWeb PushIndexedDB
04 · AI mobile app

AI-powered mobile app (private RAG / agents)

An AI assistant embedded in the mobile app, running on your own data and a private model. Voice / text / image input. Can be layered on any of the technologies above.

A good fit when: knowledge-base assistants, customer support automation, voice-first
Not when: you only want a chat feature (02 or 03 covers that)
Tech
Private RAGClaude / GPTWhisperVector DBOn-device MLStreaming
Not sure which one you need?
On a free 30-minute consultation we'll pick the right path for your project together.
Request a consultation
Pricing · 2026
PRICING.
MVP · Full · Enterprise

Three packages, three sizes. One of them will fit you.

We email you an exact proposal within 48 hours of a 30-minute call.

01 · MVP

MVP

€15–38kfrom
6–12 weeks·Fixed fee
10–50-person SaaS / startup, validation phase

You have an idea and want to validate it. You need a working app in the App Store / Play within 12 weeks.

  • 1 platform (iOS or Android)
  • 5–10 core screens
  • Backend basics (auth, REST)
  • App Store / Google Play submission
  • 1 month of support
Request an MVP proposal
★ Most clients start here
02 · Full App

Full App

€50–125kfrom
12–26 weeks·Fixed or T&M
50–500-person company with product-market fit

You have product-market fit and need a production-grade app for both iOS and Android.

  • iOS + Android (or cross-platform)
  • 20–30 screens
  • Push, analytics, in-app purchase
  • App Store Optimization (ASO)
  • 3 months of support
See details
03 · Enterprise

Enterprise

Custompricing
26+ weeks·T&M or fixed with SLA
500+ employee enterprise, regulated industry (fintech, healthtech, gov)

A mobile app integrated into a complex enterprise ecosystem, multi-region, with enterprise security rules.

  • Multi-platform
  • Complex backend / microservices
  • SSO, IAM, audit log
  • 24/7 SLA, multi-region cloud
  • Custom AI integration
  • Dedicated customer success manager
Let's talk
Hungarian Kft. · HUF / EUR / GBP accepted · Intra-EU reverse charge VAT · Updated: April 2026
What you get if you reach out now

30 minutes → 24 hours → 48 hours → your mobile app project kicks off

Within 30 minutes

I review your existing mobile app or your idea and give you immediate tech feedback.

Within 24 hours

I email you a tech stack and architecture recommendation plus an estimated timeline.

Within 48 hours

1-page proposal: feature scope + estimated development cost + delivery date.

In any case

Under NDA if needed. You own the code, and your data stays in your own tenant.

30-minute call

Book a call — a structured conversation about your goals, the risks and the stack choice. Free, no strings attached.

  • What you walk away with: where a B2B mobile app makes sense to start
  • How many weeks, what it costs — a first calibrated estimate
  • What we need from you, what we deliver
  • Under NDA if we discuss sensitive data
calendly.com/istvan-dienes-ap4/30min · 30-min
How to decide

AP4 Digital vs large agencies, freelancers and no-code platforms — which mobile app developer fits you?

Enterprise mobile app development has 4 typical routes: (1) large software agencies (expensive, slow, junior-heavy), (2) a freelance mobile developer (cheap, but bus factor of 1, no backup), (3) no-code platforms (Bubble, Glide — fast, but limited scalability and platform lock-in), (4) a senior-only agency (like AP4 Digital). Each has its place, but they suit different profiles.

AP4 Digital
Recommended
Large agency
Freelancer
No-code platform
Senior experience (average)
8+ yrs per person · 10+ yrs company-level
5–10 yrs, junior-heavy mix
One person, mixed experience
None — you build it yourself
Delivered mobile apps
50+ references · 13+ industries
Varies, often dozens
Rarely >5 solo
Thousands on templates — few prod-ready
Turnaround (B2B mobile app)
6–14 weeks
9–18 months
2–8 weeks (often unfinished)
1–4 weeks for a demo, months to prod
Reliability
Fixed price · fixed deadline · written SLA
Usually slips, breaks down on change requests
Bus factor of 1 — no backup
Platform-dependent — SaaS vendor SLA
Business data handling
Private RAG · zero retention · EU
Varies, often US cloud
Typically public AI APIs
On the vendor's servers — hard to export
Scalability
Unlimited — you own the code
Good, as long as you stay with the agency
Limited — one person of capacity
Limited — platform ceiling (Bubble, Glide)
Premium UI/UX
Yes — in-house designer
Outsourced / project-dependent
Rarely — dev-first work
Templates — limited brand uniqueness
Post-production accountability
SLA · 1–3 day bug fixes
Yes, at higher cost (T&M)
"Disappears from Slack"
Vendor uptime — you can't fix it
Typical B2B mobile app cost
€60–120,000 (fixed)
€150–300,000 (often T&M)
€10–40,000 (unfinished)
€200–1,000 / month + license (lock-in)
Best for
B2B mobile apps with premium UX
Enterprises with long procurement
PoC, very early-stage MVP
Internal admin / form apps, low scale
AP4 Digital's senior mobile development team
The team

The people behind your project.

Senior mobile developers, designers and project managers — the team that will work on your next mobile app project. Not randomly assigned resources, but named people you meet in person at kickoff.

2013
Founded · 10+ years
100+
Mobile app projects
8+ yrs
Senior experience
The combo you won't find elsewhere

"Classic dev shops have seniors but no AI. AI startups have AI but no seniors. We have both — since 2013."

Development process · 12 weeks

Mobile app development in 6 steps.

From discovery to production iteration — one closed loop, six stations. Refined through 50+ delivered B2B mobile apps.

Your involvement: 1–2 hours a week. We handle the rest.
↻SDLC12 WEEKS · LOOP010203040506
01Week 1
Discovery
  • Business goal, target audience, use cases
  • Competitor analysis
  • Platform choice (iOS / Android / cross)
  • Tech stack decision
Outcome5-page brief + tech stack decision doc
02Weeks 2–3★ Key phase
UX & Architecture
  • User journeys, wireframes
  • High-fidelity Figma prototype
  • Backend (REST/GraphQL), DB, auth
  • Push, analytics, AI integration
OutcomeClickable prototype + API spec
03Weeks 4–9★ Key phase
MVP development
  • 6 weeks of agile sprints
  • Biweekly demos
  • TestFlight / internal testing as early as week 6
OutcomeTestFlight build + 5–10 working screens
04Week 10
QA & Beta
  • Manual + automated tests
  • Crash reporting (Crashlytics)
  • Beta with a 20–50 person external group
OutcomeTest report + bugfix roadmap
05Week 11
App Store & Play release
  • Submission, screenshots
  • App description (HU + EN)
  • In-app purchases setup
  • ASO (App Store Optimization)
OutcomeLive app in the App Store and on Play
06From week 12
Post-launch & iteration
  • Crash fixes, analytics-driven development
  • A/B testing, review monitoring
  • Monthly–quarterly feature releases
OutcomeMonthly analytics report + feature backlog
Case study · 2026React NativeAnonymized
30 mo50 days
Turnaround time · −94%

Rewriting a mobile application. A decision measured in two numbers.

We rewrote an industrial client's native Kotlin Android application onto an agent-based React Native stack in 50 days — the original native codebase shrank by half, and test coverage grew from 12% to 78%.

Old native · turnaround
30 mo
New agent-based · turnaround
50 days
Old · test coverage
12%
New · test coverage
78%

The native Kotlin version was a codebase twice the size, the result of three years of iteration. With the agent-based rewrite, redundant layers fell away, the architecture was cleaned up, and the test pyramid was rebuilt. SonarCloud metrics are A-grade in both versions — but the nature of the issues differs substantially: duplicated business logic and hard-coded configuration were typical in the old code; in the new version these exist as centralized modules.

What does this mean for you?
If you want to modernize a 5+ year old mobile app, or shorten a 30+ month roadmap — this is exactly the kind of engagement we take on.
Let's talk about your project
Source: SonarCloud measurement · March 2026 · Client name under NDA
Why us · 04
04 reasons.

Why choose us for mobile app development? Four points, zero marketing.

An 8–12 person senior-led boutique studio, since 2013 · 50+ delivered mobile apps · 13+ industries.

01 · Featured

AI-native + senior. The only combination of its kind on the market.

Not a classic dev shop where AI is just marketing copy. Not an AI-only startup with no seniors behind the release. We moved to an agent-based stack in 2023 (Claude Code, Cursor, Copilot), but every senior developer of ours has 8+ years of production project experience. Classic shops are slow because they haven't made the switch. AI-only teams are risky because there are no seniors behind them. We combine both.

up to 5×faster delivery
02

Private RAG.

Your corporate data stays in your own tenant. Zero data retention, EU data residency, dedicated key pair. Self-hosted LLM is also an option.

0
bits shared
03

30+ apps delivered.

Across 13+ industries — tourism, healthcare, transit, automotive, hospitality, education. We won't be learning on your project.

13+
industries
04

Weeks, not months.

First working PoC in 2–6 weeks, production app in 12–26 weeks. Seniors + AI agents in parallel — one person ships as much per sprint as a classic 4-person team.

6 wks
first PoC
What does this mean for you?
30-minute call → 1-page proposal within 48 hours with scope, stack and deadline.
Let's talk about your project
Stack 2026

Mobile app technologies we work with.

You don't need to understand the stack — we explain what each development type is for and in which business situation it pays off fastest.

iOS — native
SwiftSwiftUIUIKitCombineCore MLARKitXcodeFastlaneTestFlightiPadOS
Android — native
KotlinJetpack ComposeML KitARCoreAndroid StudioGradleWear OSAndroid TVGitHub ActionsFirebase
Cross-platform
React NativeFlutterTypeScriptExpoKotlin Multiplatform
AI layer (new)
Claude CodeCursorCopilotLangChainpgvectorPineconeWeaviateAnthropicOpenAISelf-hosted LLMWhisperMLflow

When to use which? We decide during the 30-minute call: premium UX → native; fast MVP → React Native; AI features → alongside any stack with a native SDK.
References · 30 projects

Our featured references.

15 featured projects — the full 30-project portfolio is on the References page.

Tourism · Mobile app2025

TMRW Hotels mobile app

A complete smart-hotel system — reception, room key and concierge in a single mobile app, from booking to check-out.

Case study →
Education · Web development2025

Black Cell

Gamified e-learning platform for mandatory cybersecurity training — points, badges and leaderboards keep employees motivated.

Case study →
Logistics · ERP2024

MÉH-SYS ERP

Waste management ERP — inter-site material flow, weighbridge integration and invoicing in a single system.

Case study →
Transport · Municipal2024

BKK Integrated Taxi Registry

Budapest’s taxi licensing system — application, inspection, issuance and revision on a single authority interface.

Case study →
UNIX Auto webshop
Automotive · E-commerce2024

UNIX Auto webshop

A complex parts catalogue with precise vehicle-type identification, B2B and B2C pricing logic and integrated logistics.

Case study →
Transport · Mobile + Web2024

BKK Telebusz

Demand-responsive bus booking platform — passenger mobile app, driver interface and dispatcher console with real-time route optimisation.

Case study →
Szakmavilag.hu
Education · Web portal2023

Szakmavilag.hu

Career orientation portal for young people — interactive career map, profession profiles, training opportunities and an institution finder.

Case study →
Lina by VitaNet
Healthcare · E-commerce2023

Lina by VitaNet

Health webshop built for the US market with multi-currency payments and US-compliant shipping and privacy logic.

Case study →
battanet.hu
Municipal · Web development2023

battanet.hu

The official municipal portal of the city of Százhalombatta — accessible and structured, with a tourism module.

Case study →
Párom.hu mobile app
Mobile app · Dating2023

Párom.hu mobile app

The mobile app of Hungary’s leading dating service — chat, real-time notifications, profile matching and push-based activity logic.

Case study →
Alcoa Wheels Europe
Automotive · B2B Mobile2023

Alcoa Wheels Europe

B2B wheel configurator on mobile — compatibility checking and order history for distributors and resellers.

Case study →
Fashion Street mobile app
Tourism · Retail2022

Fashion Street mobile app

A downtown experience guide — shops, events, coupons, dining offers and map-based navigation on Budapest’s Fashion Street.

Case study →
Corvinus TPM
Education · University system2022

Corvinus TPM

The system managing course programmes and model curricula at Corvinus University — with structured, searchable presentation.

Case study →
Szakmasztar.hu
Education · Web portal2022

Szakmasztar.hu

Vocational education information portal — institution finder, training pathways, event calendar and customisable content modules.

Case study →
SIMPLE.HU
Finance · Web development2022

SIMPLE.HU

A complete redesign of the SIMPLE payment platform’s marketing and product pages — focused on performance, brand and conversion.

Case study →
View all 30 references
8-week delivery500K+ downloads★ 4.6 average

"They delivered the BKK FUTÁR mobile app to the App Store and Play in 8 weeks. After 6 months: 500K+ downloads, 4.6-star average."

KN
Kovács Norbert
Product Manager · BKK · Public Transit
§ 18  ·  2026
FAQ.
* frequently asked questions

Mobile app development — what CTOs always ask.

Still have a question? Email hello@ap4.hu — we reply within 24 hours.

An MVP mobile app typically runs €15–38k, a production-grade app for iOS and Android €50–125k, an enterprise system €125k+. AP4 Digital also offers a fixed-price MVP package, so the cost is predictable up front. The exact price depends on feature scope, platform (native vs cross-platform) and backend complexity.
6–14 wks
Typical delivery · MVP → App Store
up to 5×
Speed · traditional vs. agent-based
78%
Test coverage · new release average
since 2013
50+ delivered mobile apps