An operating system
for access terminals.

DejaOS is our Linux-based embedded operating system built for smart access terminals, HMI and edge devices. It is designed for developers to build customized access, intercom and IoT applications directly on the hardware.

The primary supported language is JavaScript. We also provide a native C/C++ SDK for low-level driver and performance-critical development.

Not necessarily. The JavaScript runtime abstracts most hardware complexity. Web and application developers can build functions without touching kernel drivers. Low-level work still requires embedded experience.

Yes. DejaOS is open for containerized or native Linux applications, subject to hardware resource and permission policies.

Face camera, NFC / RFID reader, relay, Wiegand, RS485, GPIO, screen, audio, speaker, microphone, ethernet, Wi-Fi and BLE are all exposed via APIs.

Yes. You can lock the device to launch only your custom app and disable our default access UI.

Not every Feocey device runs DejaOS. DejaOS is pre-installed on selected Feocey access-control and video intercom models, so confirm the model with Feocey. Android models such as FCV4906 and FCV5006 are outside DejaOS. We provide a porting service for qualified hardware partners.

A chip vendor SDK focuses on chip bring-up. DejaOS is a finished application platform with pre-built access, biometric, video, networking and security stacks, ready for business developers.

Yes. We integrate LVGL as the native GUI framework, so you can build lightweight, low-power HMI interfaces directly.

Yes, on DejaOS developer devices. These are embedded devices you buy and develop on yourself, and branding customization includes boot screen, home UI, logo, color theme and menu structure for OEM and ODM partners. For Feocey standard (off-the-shelf) products, branding or boot-image customization may need separate firmware preparation and a different delivery process, so discuss it with Feocey first.

Secure boot, firmware signature verification, local encrypted storage for biometric templates, permission sandbox, application isolation and remote secure OTA updates.

Yes. The platform supports OTA for both system firmware and individual third-party applications, with version rollback support.

We provide a PC simulator for early application logic development. Hardware-related functions need real devices for testing.

We provide API reference, sample code, demo projects, a developer guide, technical tickets and scheduled online developer workshops for qualified partners. The public documentation and the DejaOS GitHub organization cover the developer SDK and examples.

We do not offer free hardware, but we have discounted developer units for partners who intend to build commercial solutions based on DejaOS.

Core OS source is not open. We can sign an NDA and provide extended technical interfaces, porting packages and deeper technical support for strategic partners. For Feocey standard products, the integration interfaces are open, but their core source code and the source code of Feocey’s attendance and office platform are not open.

Yes. It can run fully offline or connect to your own private cloud or server, without mandatory dependency on our cloud service.

For a DejaOS development project, a simple custom UI and workflow may take 2–4 weeks. Complex projects with custom peripherals, new biometric algorithms or full system integration usually take 2–4 months. Customization of standard products and OEM / ODM hardware is confirmed per project.

Yes. Once your application is ready, you can distribute it to end users, system integrators and other partners running DejaOS terminals.

The application sandbox isolates third-party apps. If one custom app crashes, the underlying access and biometric service will keep running normally.

Yes. You can package language resources and switch UI languages dynamically, including English, Spanish, French, Portuguese and more.