Mobile apps engineered for how people actually use their phones, not how they look in a mockup.
Native iOS and Android and cross-platform mobile apps, built by the same team that handles your design, backend, and API integrations. One roof, zero hand-offs, one accountable build.
A mobile app is only as good as the systems behind it. Most app projects stall in the seams between a design firm, a dev shop, and whoever owns your backend. Rule27 removes those seams. Four studios sit under one roof, so the people designing your screens, wiring your API integrations, and shipping your builds are the same team, accountable to one timeline. Where creative audacity meets technical precision, you get an app that performs, not just one that demos well.
We start with how your users actually behave, then choose the stack that fits them. Native Swift and Kotlin when performance and platform depth are critical. Cross-platform React Native or Flutter when speed to market and budget lead. We do not pick a technology and then justify it. We test the interface with real users before production code is written, engineer for fast load times and smooth interaction across the device range your audience actually carries, and run automated and manual QA on real hardware and OS versions before every release. Because our Development Lab and growth teams share the same building, an app can launch with the API hooks, analytics, and search-visible surfaces already accounted for rather than bolted on later.
This service fits founders shipping a first product, operators replacing a fragile legacy app, and teams that need mobile connected to an existing CRM, payment stack, or backend without a vendor coordination tax. You own 100% of the source code at completion. No licensing, no lock-in. Results sourced from Google Search Console and Google Analytics client deployments. Past performance does not guarantee future results.
Built to deliver.
Native and cross-platform builds, chosen by fit
iOS development in Swift and Android in Kotlin for performance-critical apps
React Native and Flutter for speed-to-market and budget-led projects
UX research and prototyping tested with real users before production code
API integration to your existing backend, CRM, payment processors, and third-party services
Performance engineering for fast load, smooth animation, and reliable operation across the device range
Automated and manual QA on real devices and OS versions before every release
App Store and Google Play submission, plus post-launch support and OS-update maintenance
See how Mobile App Development would work for your business.
Book a consultationThe engagement.
Discovery
We map your users, requirements, and integrations, then recommend native or cross-platform based on how your audience uses their phones and what the roadmap demands. You leave with a scoped plan, not a guess.
Design
UX research and interactive prototypes, tested with real users before a line of production code is written. Design and engineering sit in the same room, so what gets approved is what gets built.
Development
We build the app and wire the API integrations to your backend, CRM, and payment systems in parallel, with automated and manual QA running on real devices throughout, not saved for the end.
Launch
We handle the full App Store and Google Play submission, including compliance, screenshots, and metadata. Final payment is tied to a successful, live listing, then post-launch support begins.
Priced like a product.
Not sure which tier fits? We will scope it with you.
Start with Mobile App DevelopmentWe don't collect final payment until your app passes App Store / Play Store review and is live for download. If Apple or Google rejects the submission for any reason related to our development, we fix it at no charge.
Asked often.
Do you build for iOS, Android, or both?
Both. We build native, Swift for iOS and Kotlin for Android, when performance and platform depth are critical, and cross-platform, React Native or Flutter, when speed to market and budget lead. We recommend the right approach in discovery based on your users and roadmap, not on what we prefer to build.
Do I own the code?
Yes, 100%. All source code is yours at project completion. No licensing, no lock-in. You are never dependent on us to keep your own product running.
How long does it take to build a mobile app?
A well-scoped MVP typically takes 12 to 16 weeks. Full-featured apps run 16 to 24 weeks. Timeline depends on complexity, the number of integrations, and how clearly requirements are defined up front, which is exactly what discovery is for.
What does a mobile app cost?
MVP builds start at $25,000, standard apps run around $50,000, and enterprise projects are $100,000 and up. The range reflects scope: number of screens, integrations, native versus cross-platform, and backend complexity. We scope a fixed number in discovery so there are no moving targets.
Can you integrate with our existing systems?
Yes. API integrations to your existing backend, CRM, payment processors, and third-party services are handled as part of development. Because design, engineering, and integration are the same team here, those connections are planned from the start rather than negotiated between separate vendors after the fact.
What happens after launch, and who handles App Store submission?
We manage the full submission process for both the App Store and Google Play, including compliance, screenshots, and metadata, and we do not collect final payment until your app passes review and is live. Post-launch support is included for the agreed period, typically 3 to 12 months by tier, after which ongoing maintenance retainers cover bug fixes, OS updates, and new features.