Mobile-only
Full development of your iOS and Android apps, delivered by our team or embedded into your in-house mobile team. AI features included when you need them.
Diffco Services
Native and cross-platform mobile apps for iOS and Android
High-quality iOS, Android, and cross-platform apps, engineered by senior mobile teams. AI features (agents, copilots, voice, computer vision) baked in when your roadmap calls for them.
Native iOS
Native Android
React Native
AI features
Choose your scope
Mobile + back-end
Mobile apps plus the back-end that powers them: APIs, databases, AI pipelines and agent runtimes when needed, and observability. One team, one stack.
Web companion
A web companion app alongside your mobile experience, built on the same back-end and shipped on the same release cadence.
Admin panel & ops tooling
Internal admin panels, ops dashboards, and content management for the teams behind your mobile product. AI output review tooling available when applicable.
What we bring
Tech stack
Mobile
Swift
Java
React Native
Kotlin
Flutter
Objective C
Backend
Node.js
Nest.js
Express
PHP
Python
ASP.NET
Django
Flask
Ruby on Rails
Sinatra
C#
Symfony
Laravel
Yii
Go
Erlang
C/C++
Scala
Rust
Julia
R
AI models
Anthropic
OpenAI
Gemini
Hugging Face
Mistral
Qwen
Grok
Kimi AI
TypeSafe AI
Open weight models
DevOps
Docker
Kubernetes
AWS
Azure
Google Cloud
ElasticSearch
Apache Kafka
QA
Selenium
TestMu AI
Cypress
JUnit
pytest
RSpec
PHPUnit
Mocha
Jest
JMeter
OWASP ZAP
Diffco AI Methodology
A delivery method built for the AI era, not retrofitted to it.
Code is the cheap part now. Knowing what to build first, which foundation will hold at ten times the users, and what not to build at all is where projects are won.
Senior engineers make those calls. More than 100 AI agents per engineer do the building, around the clock, on our own delivery platform built on Claude Code and OpenAI Codex. A living plan with automatic checks keeps every agent inside the lines.
- You click through your product before we build it
- We bring you the parts of the job you never put into words
- Every architecture decision is written down with the alternatives
- Everything traces back to a goal, which is what makes change fast
- People make the decisions, and AI agents build inside them
- Before release, a person watches it work
- The whole project
is a document you can read
- Read the full methodology
How we build
Seven stages, with a person signing off at every gate.
Every project runs through Production-Ready AI Engineering: seven stages, senior engineers directing 100+ AI agents, a check on every save, and a person signing off at every gate.
- 01
Discover
Human + AIWorkshops and stakeholder interviews with AI in the room. It cross-verifies inputs across calls, docs, and Slack threads, flagging blind spots, edge cases, and contradictions humans miss.
- 02
Plan
AIAI decomposes the work, picks architecture, models, and tools. Surfaces risks, costs, trade-offs, and conflicts between stated requirements, before they become bugs.
- 03
Align
HumanYou review and approve. Every decision is logged: an auditable trail before any code is written. No black box, no scope drift.
- 04
Build
Human + AIAI agents execute the approved plan inside engineered guardrails. Senior engineers steer and unblock. Sprint cadence with working artifacts, not status decks.
- 05
Validate
Human + AIThree independent layers on every release candidate: automated evals, senior code review, and dedicated Human QA, with manual and exploratory testing alongside security, performance, and accessibility checks.
- 06
Release
Human + AIProduction deployment, UAT, knowledge transfer, runbooks. Cutover is documented, reversible, and on a schedule you approve. Your team takes the keys, or we operate it for you.
- 07
Evolve
Human + AILaunch is a milestone, not a finish line. Monitoring, feedback loops, and incremental improvements keep the system compounding, and feed the next discovery cycle.
Every later change re-enters the same loop, and nothing skips a step.
Read the full methodologyEngagement models
Ways to work with us
Dedicated Team
Human-led, AI-assisted · Monthly commitment
A senior squad reserved for you on a monthly basis, using AI to move faster. Best for evolving products and complex domains. You get:
A senior team that’s always yours, never reassigned mid-project- Scope and priorities you can flex sprint by sprint
- Predictable monthly spend with no padding for risks you may never use
- Velocity from a team that already knows your codebase
Agent-Led Delivery
AI-built, senior-directed · Monthly commitment
Most of your monthly budget goes into AI agents, with a lean senior team directing and reviewing their work. You get:
- Maximum of your budget working on the build, not on headcount
- Working software at the end of every short sprint
- A preview of what each change touches before it’s built
- Sign-off on every release against standards agreed before coding starts
Why teams choose Diffco
Senior, dedicated teams
Senior experts on every project: AI/ML and software engineers, product and UX designers, and project and product managers. Assigned to you, never reassigned mid-project.
Streamlined development process
Agile delivery on Production-Ready AI Engineering, from early PoC to production rollout. Clear gates, your sign-off at each one, so you always know what’s happening and why.
Transparent billing
You always know:
- What you’re paying for
- How time is spent
- How costs connect to delivered outcomes
Audit-ready from day one
Every agent action is logged and every decision is traceable. SOC 2-aligned practices, HIPAA- and GDPR-aware delivery, and full IP assignment.
Clear communication and detailed reporting
From the first workshop to post-launch optimization, you get:
- Direct access to the Diffco team
- Regular progress updates and demo builds
- Clear documentation of decisions, architecture, and metrics
Own it, or let us run it
Knowledge transfer, runbooks, and documented, reversible cutovers if your team takes the keys. Ongoing support, monitoring, and improvements if you’d rather we operate it.
Our clients’ success stories
Success stories of our clients
We’ve developed a platform where players can earn bonuses by playing top mobile games
Full development + AI agentic product discovery
We developed an iOS app for socializing with like-minded people by participating in engaging events
We’ve developed an Android mobile app for a quick groceries delivery service
We’ve developed an audio marketing platform with intelligent advertisements
We were impressed by Diffco’s approach to the development process and how they engineer new solutions.
We built the AI Moderator that runs Maze’s user research interviews
We’ve introduced computer vision technology for easy ID and DL recognition for car rental services
We’ve developed an AI-powered app to create stunning in-home newborn photography
We’ve created AI technology that makes everyone a movie star
We’ve built an AI app that allows anyone to choose a restaurant like a food expert
We’ve implemented an excellent technology of sound transmission over WiFi
We’ve created an app that turns your device into a child monitoring system in your car
We’ve developed a platform where players can earn bonuses by playing top mobile games
Full development + AI agentic product discovery
Explore our
amazing case studies
Let’s build something
great together.
Need other services?
AI Agents DevelopmentCustom agents and multi-agent systems that do real work inside your CRM, EHR, ERP, and internal tools.
AI & ML DevelopmentML, RAG, computer vision, and copilots, engineered to production standards with Production-Ready AI Engineering.
AI-Driven Product DiscoveryTwo weeks to answer “should we build this, and what would it cost to run,” before you spend six months finding out.
Team AugmentationSenior engineers who join your team, fit your workflow and culture, and start shipping from week one.
Web DevelopmentModern websites and web apps engineered by senior teams directing AI agents.
Frequently Asked Questions
Custom mobile app development is building iOS and Android apps tailored to your business, from focused MVPs to large multi-platform products. At Diffco we build for both: classic mobile experiences (e-commerce, marketplace, messaging, productivity) and AI-native apps with agents, copilots, voice, or computer vision baked in.
The costs of any mobile application development project are variable. The exact amount you’ll pay to develop a custom app depends on the features, functionality, and level of support you may need. The more advanced the app, the more you’re likely to pay for custom guidance and expertise. At Diffco, we offer a transparent pricing structure to eliminate the confusion and complexities of planning your budget. Our outsourced custom app development prices are based on the “Time and Materials” approach. This means we charge our clients according to the specific resources they need, and the time it takes to produce, maintain, and manage the app. We believe this is the best way to price custom app development for projects, because the best mobile apps often require flexible thinking, regular tweaks, and shifts in scope. With our quotes, you don’t pay for contingencies and extra features you don’t need either. See why Diffco is a trusted mobile application development company today.
The time scale involved in developing a custom app can also differ based on a range of factors. Once again, the complexity of your application will usually determine how long it takes to create. Simple apps can be built in just 1-2 months, while others take several months to create. No matter how advanced your custom app might be, working with Diffco will ensure you can take a viable product to market asap. At Diffco, we use an agile development process to design your solution as quickly as possible. We apply a nimble and responsive approach to incorporate your feedback during the development process, and adjust priorities as needed. Our agile approach means we can create a minimum viable product (MVP) for your app as quickly as possible before rolling out additional features and capabilities to improve the user experience.
Our custom mobile app development services are suitable for all kinds of mobile applications. Our experienced team can fully develop, manage, and maintain apps for both iOS (Apple), Android, tablets, and various mobile devices. We can also work with your team on a joint development effort for a specific platform. Throughout our development process, we follow best practices and industry guidelines to ensure the architecture of your app remains clean and compliant. Our teams are committed to ensuring good documentation, code readability, and design principles. We also follow principles pre-established by Google (such as style guides for Java, JavaScript, Typescript and Kotlin) and Apple (Swift and Objective-C) guides to ensure your app is more likely to be approved by your chosen app store.
18+ years of mobile engineering. Senior engineers from day one. Direct access, no PM filter. We’re known for AI-native work, but we ship great mobile products of every kind, with or without AI.
Yes. Many of our mobile engagements are classic iOS/Android products, no AI features required. Same senior engineers, same engineering bar.
It depends on your product. Native (Swift / Kotlin) for performance-critical or platform-specific apps. React Native or Flutter for parallel iOS/Android shipping when you want one team. We finalize during a 1–2 week discovery.
Yes. We’ve inherited and shipped from legacy Objective-C/Java codebases as well as React Native and Flutter projects.
Yes. We handle store metadata, screenshots, review process, and post-launch updates as part of every full engagement.
Standard: we ship these on most engagements. We work with Firebase, OneSignal, RevenueCat, AppsFlyer, Branch, and the major platform-native options.
