Desktop App Development
Build high-performance desktop apps for macOS and Windows

A desktop app that feels native, because it is.
Desktop-ready interface
Keyboard-first workflows, native window behavior, and high-density layouts, optimized for real desktop usage.
Full OS integration
File access, notifications, deep linking, clipboard, menu bars, and other system-level features. It behaves like a true desktop app, because it is one.
One codebase, desktop included
Electron with React for most products, react-native-macos and react-native-windows when you need deeper native integration. Logic, design systems, and workflows stay shared with mobile and web.
Built for AI features
Assistants, on-device models, and agent integrations like MCP. Desktop unlocks local compute, file access, and OS-level hooks that browsers can't match, and we build apps designed to host AI.
Ship at AI speed
Agents scaffold, refactor, and test in parallel under senior review, so work keeps moving between sessions. You get more shipped per sprint without lowering the engineering bar.
Reliable performance at scale
Tuned render paths, startup time, and memory usage. Built to stay smooth with large data sets and complex UIs.
Automated delivery
Installers, auto-updates, crash reporting, and platform-specific packaging, including code signing and notarization. Ready for release on macOS and Windows.
Owned by your team
Built with handoff in mind: clear structure, documentation, and naming conventions so your team can take full ownership.
Scope → Build → Scale
Take one product from scope to scale.
Scope
We map your problem, align on deliverables, and define success metrics. No surprises once work starts.
Build
Engineers ship with AI-native workflows from sprint one. Code, decisions, and ownership, not discovery decks.
Scale
Expand scope, add platforms, or hand off to your team. The stack, tooling, and raised bar stay with you.
Why teams bet on Callstack
From billion-user apps to React Native core, this is why teams choose Callstack when they need to move fast and get it right.

10 years in React Native. Now shaping agentic engineering.
For a decade, we have helped define how teams ship with React Native. Now we are helping shape how they work with agents.
Founded in 2016 ·Backed by Viking Global Investors
React Foundation members. Core Contributors.
We are founding members of React Foundation and Core Contributors to React Native. You get direct access to people close to the decisions shaping the frameworks you use.
Open source since 2016. Our code runs in your app.
We contribute to React Native and maintain libraries across its ecosystem. Our code runs in apps used by millions of people every day.
39M+
Downloads / month67K+
GitHub stars300+
React Native commits100+ Enterprise clients with 7B+ users.
We work with teams shipping at real scale. You get a partner used to high-stakes products, not learning on your roadmap.


































Agent Conf. The conference for the Agentic era.
The conference we built for the shift from writing code to orchestrating agents.


We are Codex Ambassadors.
We run meetups, workshops, and hands-on sessions that help teams learn Codex and apply it in real work.

10 years in React Native. Now shaping agentic engineering.
For a decade, we have helped define how teams ship with React Native. Now we are helping shape how they work with agents.
Founded in 2016 ·Backed by Viking Global Investors
React Foundation members. Core Contributors.
We are founding members of React Foundation and Core Contributors to React Native. You get direct access to people close to the decisions shaping the frameworks you use.
Open source since 2016. Our code runs in your app.
We contribute to React Native and maintain libraries across its ecosystem. Our code runs in apps used by millions of people every day.
39M+
Downloads / month67K+
GitHub stars300+
React Native commits100+ Enterprise clients with 7B+ users.
We work with teams shipping at real scale. You get a partner used to high-stakes products, not learning on your roadmap.


































Agent Conf. The conference for the Agentic era.
The conference we built for the shift from writing code to orchestrating agents.


We are Codex Ambassadors.
We run meetups, workshops, and hands-on sessions that help teams learn Codex and apply it in real work.
Let’s find the right path for your product.
Whether you’re planning new work or unblocking an existing product, we’ll help you choose the right path forward.
Can I build a truly native-feeling desktop app with React Native?
Yes. With full support for Windows and macOS, React Native can deliver desktop apps that feel native, because they are.
Will my desktop app work across both macOS and Windows?
Yes. We use platform-specific extensions where needed, but most of your business logic and UI can be shared across both.
Can I reuse code from my mobile or web app?
Absolutely. We specialize in setting up shared codebases across mobile, web, and desktop, maximizing reuse while respecting platform boundaries.
Do you support integration with existing native code?
Yes. We handle brownfield setups, allowing you to incrementally adopt React Native within an existing desktop codebase.
What about desktop-specific UX like keyboard shortcuts or window behavior?
We handle all the details, from focus management to multi-window handling, so your app behaves exactly like users expect.
Can you help with packaging and store deployment?
Yes. We support building for the Microsoft Store and Mac App Store, including code signing, notarization, and installer setup.
Do you build desktop apps with Electron or React Native?
Electron with React in most cases: it's the fastest path to a production desktop app, with the most mature ecosystem, powering VS Code and Slack. When you need a smaller footprint or deeper native UI, we work with react-native-macos and react-native-windows, the stack behind parts of Office and Windows 11.
Can you build AI features into our desktop app?
Yes. We integrate assistants, on-device models, and agent protocols like MCP directly into desktop apps. Desktop gives AI products local compute, file access, and system-level integration that web apps can't match.
How do you use AI to ship faster without lowering quality?
Agents scaffold, refactor, and test in parallel under senior review, so work keeps moving between sessions. You get more shipped per sprint without lowering the engineering bar.
Build or scale your desktop app
We deliver cross-platform desktop apps without compromising performance or user experience. Let's scope the build.
We had been struggling with React Native application performance until we met Callstack.
Open Source
Want to build it on your own?
We open-source the tools behind our delivery model.
Use them, fork them, or let us run them for you.
Insights
































































