About Controlled Systems Group
Controlled Systems Group is an independent studio designing and operating mobile applications that make everyday phones quieter, safer and more predictable to use.
What we do
We focus on small, well‑defined tools that run quietly in the background and give users clear control over how and when they can be reached. Our work covers concept design, product management, development oversight and long‑term maintenance for our own applications.
We collaborate with a small network of experienced developers and designers, while keeping overall product direction, data handling and support under our direct supervision.
Current applications
QuietGuard is a safety‑focused call screening app. Users define a trusted circle of contacts; only trusted calls ring, while all other calls are quietly silenced and kept in the call history for review.
How we work
- Simple, clearly explained features with a narrow, practical purpose.
- Respectful handling of data and permissions, with minimal collection by design.
- Regular updates to keep pace with platform changes and device compatibility.
Company details
An independent company based in the United Kingdom, currently focused on Google Play distribution, with selected projects planned for additional platforms in the future.