Customer mobile apps
Booking, ordering, loyalty, accounts and support in one simple, on-brand mobile experience that keeps customers coming back.
[ MOBILE APPS ]123DIGI · Service
Mobile App Development
123Digi designs and builds modern iOS and Android mobile apps for UK businesses. Customer apps, staff apps and field-ops apps, engineered for real phones, real hands and real work outside the office.
- Studio
- 123DIGI
- Based
- Colchester, UK
- Coverage
- UK-wide
- Engagement
- Sprint or retainer
[ THE PROBLEM ]
What we usually see when clients reach out.
Your customers and staff live on their phones, but your business still runs off a desktop. Paper checklists, shared logins and manual handovers between the office and the field are costing you speed, accuracy and trust every week.
[ HOW WE FIX IT ]
A measured, senior-led approach.
We design and build native-feeling iOS and Android apps tailored to how your people actually use their phones. On a forecourt, in a warehouse, on a delivery round or at a customer site. Secure, fast and wired directly into your existing systems.
Specific, repeatable work, not vague promises.
Staff and field apps
Jobs, routes, checklists, inspections and live updates, designed for a phone in a gloved hand, not an office mouse.
Operational apps
Real-time operations tools connected to your core systems, so decisions happen in minutes instead of at the end of the day.
Cross-platform and native
Cross-platform where it makes sense, fully native where it has to be. We choose based on your users and requirements, never fashion.
[ WHO WE WORK WITH ]
Built around the people who actually buy this work.
- Founders
- Operations leaders
- Heads of digital
- Field service managers
[ INDUSTRIES ]
Where we have the deepest pattern recognition.
- Automotive and fleet
- Logistics and delivery
- Retail and hospitality
- Field service
- Healthcare and clinics
[ PROCESS ]How we work
From idea to live software in five honest steps.
Discover, design, develop, launch and grow. A simple process that takes your idea, turns it into real software your team uses every day, and keeps improving the system after it goes live.
01Act 1
Discover
We sit down with you, map how your business runs today and agree exactly what the software needs to do for your team and your customers.
01 / 05
02Act 2
Design
We plan the user experience, design the screens and agree the system architecture before a single line of production code is written.
02 / 05
03Act 3
Develop
We build the software, web app, mobile app or integration on modern, typed technology, shipping in small releases you can review and test.
03 / 05
04Act 4
Launch
We test, deploy and support the new system so it works the day it goes live and keeps working under real-world use.
04 / 05
05Act 5
Grow
We help you grow the system after launch with SEO, performance improvements, new features and ongoing automation.
05 / 05
The questions buyers ask us most often about mobile apps.
How much does mobile app development cost in the UK?
Most UK mobile app projects with 123Digi sit between £28,000 and £140,000, depending on the number of platforms, the complexity of the features and the integrations required with your existing systems.
iOS, Android, or both?
Usually both. We typically build once and ship to both stores using a modern cross-platform approach, with native modules where performance or hardware features demand it.
Do you handle App Store and Play Store submission?
Yes. We handle full release management, including Apple Developer, Google Play, code signing, review responses and ongoing updates after launch.
Can the app connect to our existing systems?
Yes. We integrate mobile apps with your existing web platforms, CRMs, ERPs, payment providers and back-office tools through secure APIs and authentication.
How long does a mobile app take to build?
Most mobile projects go from discovery to a store-ready release in 10 to 16 weeks, depending on scope and the number of integrations.
Mobile Apps in the wild. Selected case studies.
Brand · Website · Booking · Social · Paid Media · SEOBrand · Website · Booking · Social · TyresWebsite · Booking · UX
Alpha MOT Centre
A full-stack engagement covering brand, website, booking, social, advertising and SEO for one of Colchester's busiest MOT and tyre centres.
Colchester MOT Centre
A booking-first MOT centre with brand, social, tyre commerce and integrated booking, all in one calm system.
Tyres24
A 24/7 mobile tyre fitting website for cars, vans, trucks and heavy vehicles.
Pair this with another service for compounding results.
ServiceServiceService
Web Application Development
123Digi builds secure, scalable web applications for UK businesses. Dashboards, customer portals, booking systems and internal tools, designed around how your team actually works and engineered to run at real production scale.
AI Integration
123Digi is a UK AI integration company. We design practical AI chatbots, smart tools and workflow automations and wire them directly into your websites, apps and business systems, so AI earns its keep instead of sitting on a demo slide.
Business Automation
123Digi automates UK businesses. We map the busywork, connect your tools and build the workflows, so your team stops moving data between systems and starts focusing on customers and growth.
Ready to scope a mobile apps engagement? Send a short brief and we will reply within one business day.
[ NOW BOOKING 2026 · UK-WIDE ]
Readytobuildsmarterdigitalsystemsforyourbusiness?
Whether it is a custom web app, a new mobile app, an AI integration or a full digital overhaul, tell us what you want to build. We reply within one working day with a clear next step and a ballpark timeline.
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Transparent quote & timeline
UK-based senior team