iOS and Android apps, from idea to the App Store.
Have an app idea, an existing platform that needs a mobile experience, or a business process that would work better on a phone? We design, develop, and launch custom iOS and Android applications for businesses, startups, and technology companies, the app, the backend, the APIs, and the integrations behind it, and we help prepare and submit it to the Apple App Store and Google Play. From the first working version to ongoing updates, we help bring your application into real-world use.
Apps for customers, employees, and new businesses.
From customer experiences to internal operations, we develop mobile applications designed around the people who will use them.
Consumer & customer apps
Booking, payments, loyalty programs, customer accounts, notifications, and self-service features.
Business & employee apps
Work assignments, approvals, internal communications, reporting, and access to company systems.
Field & operations apps
Offline-friendly job records, inspections, photos, equipment info, GPS-supported workflows, and sync.
Marketplace & booking apps
Multi-sided platforms with listings, profiles, scheduling, messaging, payments, and reviews.
AI-powered mobile apps
Assistants, document processing, intelligent search, recommendations, and features connected to your data.
Hardware-connected apps
Applications that communicate with supported devices, sensors, equipment, and connected products.
Connecting an app to your existing web platform and business systems applies to almost every one of these, it's a foundation, not a separate category. See Systems integration.
We design the app, not just the code behind it.
A quick example of a customer booking flow, the kind of clean, simple experience we build. Easy to extend with payments, accounts, notifications, history, and a business dashboard behind it.
Illustrative mobile app concept, nothing here is saved or transmitted. This shows the user experience we can create, not only the technology behind it.
More than an app. We build everything that makes it work.
A mobile application is often one part of a larger software platform. Behind the screens are accounts, data, APIs, business rules, notifications, payments, and admin tools, and we build and connect those so your app works reliably with the rest of your business.
A concrete example: a customer books a service in the app, the backend creates the booking, the business sees it in a web dashboard, the customer gets a notification, and payment runs through the appropriate integration, one connected system, several interfaces.
Native, cross-platform, or web app?
We recommend the approach that fits your users, features, budget, and long-term plans. Not every app needs separate iOS and Android codebases, and not every mobile experience needs an app-store download.
| Approach | Best suited for | Considerations |
|---|---|---|
| Native iOS & Android | Platform-specific experiences, demanding device integrations | Separate builds can raise cost and maintenance |
| Cross-platform | Many business, marketplace, and consumer apps | Shared code cuts duplication, with native work where needed |
| Responsive web app | Portals, forms, dashboards, simpler mobile workflows | Easy browser access, but different device capabilities |
We have experience building cross-platform applications with Flutter, alongside the backend services, APIs, databases, and cloud infrastructure that support them. Where native or a web-based approach fits better, we evaluate that before recommending an architecture.
A clear process, with something to see at each stage.
You'll have opportunities to review working versions of your app throughout development, test real workflows, and give feedback before launch.
| Stage | What we do | What you see |
|---|---|---|
| Plan | Define users, requirements, platforms, first-release priorities | Product scope and development plan |
| Design | Map navigation, screens, and interactions | Wireframes and interface designs |
| Build | Develop the app, backend, and integrations | Working features and test builds |
| Test | Check real devices, workflows, security, edge cases | Tested release candidates and fixes |
| Launch | Prepare store listings and submit the app | Store submission and release prep |
| Improve | Review feedback, performance, new requirements | Updates, fixes, and planned enhancements |
You can try builds before public release, Android test builds and Apple's TestFlight let authorized testers use the app early, so nothing is a surprise at launch.
We help get your app ready for real users.
Building an app is only part of it. Releasing it takes developer accounts, signing and release configuration, store listings, privacy information, testing, and compliance with platform requirements.
Apple App Store
App configuration, screenshots, listing information, test distribution via TestFlight, submission, and review support.
Google Play
Android release preparation, testing, store listing, required declarations, submission, and review support.
Developer accounts are normally established under your business, with access granted to us, so you keep ownership and never feel locked in. Final approval rests with Apple and Google; we design to their guidelines and respond to review issues to avoid avoidable rejections.
We've built apps that people actually use.
Develop & Conquer brings more than 18 years of software engineering experience, including building and launching applications across mobile and web. We understand the full process, designing interfaces, connecting backend services, testing, deployment, app-store submission, and ongoing updates.
That experience extends beyond development. Our founder has built and operated technology products, Agnomy among them, a multi-platform product involving mobile and web applications, user accounts, scheduling, messaging, payments, and backend APIs, with ongoing releases. That's firsthand understanding of what happens after an app reaches real users.
We attribute examples honestly, founder and prior-venture experience is noted as such rather than presented as D&C client work, and we're glad to walk through relevant projects and how we'd approach yours on a call.
Already have an app that needs work?
You don't always need to start from scratch. We extend existing apps, build mobile companions for web platforms, connect new services, and fix what needs attention.
Mobile companion
Build an iOS or Android version of an existing web platform.
Add features
Push notifications, payments, or messaging on top of what you have.
Connect systems
Wire the app into a CRM, ERP, or custom backend.
Stabilize
Investigate crashes, performance, and unreliable synchronization.
Modernize
Update outdated dependencies, architecture, and OS/store requirements.
Add AI features
Bring search, assistants, or document features into an existing app.
Have an existing app? Tell us what needs to change and we'll review it honestly before recommending a path.
Mobile app development in Sacramento and beyond.
Develop & Conquer helps businesses, entrepreneurs, and technology companies build custom iOS and Android applications, customer-facing apps, business apps, marketplaces, field-service tools, and connected mobile platforms.
Our work includes application design, backend engineering, API integrations, testing, app-store submission, and ongoing improvements, and you own the code, the data, and the store listings.
Based in Sacramento, we work with companies throughout Northern California, including Roseville, Folsom, Elk Grove, Rancho Cordova, Davis, and surrounding communities, as well as clients working remotely.
Mobile app development, answered.
How much does it cost to develop an iOS and Android app?
Costs depend on the number of features, user types, backend requirements, integrations, design, and testing. We help define a practical first version and estimate the work before development begins.
Can you build one app for both iOS and Android?
Yes. Cross-platform technologies such as Flutter can support both from a shared codebase. We evaluate whether that fits the app's features, performance needs, and long-term plans.
Can you turn my app idea into a working product?
Yes. We help define requirements, prioritize an MVP, design the experience, develop the app and its backend, and prepare it for launch.
Can you build an app that connects to my existing website?
Yes, where the platform supports the integration. We build mobile apps that communicate with a website, database, or business platform through suitable APIs.
Can you build an app with payments and subscriptions?
Yes. We integrate appropriate payment and subscription systems, with the implementation shaped by the product type and Apple and Google billing policies.
Can you build an app that works offline?
Yes. For field apps, we design local data capture and synchronization when connectivity returns, based on which functions must stay available offline.
Can you help publish my app to the App Store and Google Play?
Yes. We assist with developer account setup, release preparation, listings, testing, submission, and review issues. Apple and Google make the final approval decisions.
Will I own the app and source code?
Ownership and licensing are defined in the agreement. We make agreed deliverables, source code access, and developer-account responsibilities clear from the start.
Can you improve an app another company developed?
Often. We review the existing codebase, dependencies, backend, and technical issues before recommending improvements or additional development.
Do you offer maintenance after the app launches?
Yes. We provide ongoing development and maintenance, or prepare documentation and access for a qualified internal team or another developer.
Do I need a mobile app, or would a web app be better?
It depends on the experience, device features, offline needs, distribution, and budget. We help determine whether a mobile app, a responsive web app, or a combination makes the most sense.
Tell us about the app you want to build.
Have an app idea, an existing product that needs a mobile experience, or an application that needs improvement? Tell us what you're trying to build, who it's for, and what you want it to do. We'll help you understand the options, define a practical starting point, and determine the right approach, including whether a native app is even the right call.