Case Study: Substack Doubles Mobile Build Speed with Bitrise

Substack doubles mobile build speed with Bitrise

Substack, a subscription-based publishing platform with a central mobile app, faced a fragmented and complex mobile continuous integration (CI) setup. Their workflows were split across multiple tools including Bitrise, Buildkite, and Xcode Cloud, resulting in slow build times, high operational burden, and a lack of confidence in their release process. They needed a single CI provider to reduce complexity and improve performance.

By consolidating entirely onto Bitrise's mobile-focused CI/CD platform, Substack streamlined its development process. The solution resulted in a 40-50% improvement in build speed across both iOS and Android, a 75% reduction in CI tooling complexity, and over a 100% increase in test coverage. Bitrise provided the reliable foundation that empowered Substack's small mobile team to move faster and with greater confidence.

Substack