Next-generation Proton Mail mobile apps: more than meets the eye | Proton

Proton Mail’s next-generation iOS and Android apps have been completely rewritten on a novel technology stack, aiming to improve quality, close the feature gap between platforms, and increase engineering velocity. The new stack, based on Rust, has led to a significant increase in code reuse and stability, with early signs pointing to faster feature updates and fewer crashes. The project, known as Engineering Transformation, is part of a broader initiative to apply this approach across Proton’s mobile ecosystem.