Capyloon mobile Web-based OS works on Pinephone Pro, Librem 5, Pixel 3a

Capyloon is an experimental Web-based OS leveraging b2gOS that served as the base for the now-defunct Firefox OS. The developers’ goal is to provide an open-source OS improving privacy and user control through web technologies.

It’s still early stage, and some of the technologies used include the IPFS protocol, WebAssembly plugins, and the Tor network. Capyloon is more like a new phone shell as it replaces Phosh when installing it in a Linux smartphone.


The first version of Capyloon released last month worked on Pixel 3a, other Android phones through a generic system image, and 64-bit x86 Debian machines. But since then, the developers added support for Apple M1, and yesterday they released Debian packages for PinePhone Pro and Librem 5 Linux smartphones to run Capyloon on top of a Mobian image.

Instructions are as follows:

  1. Download the Debian package for PinePhone Pro or Librem 5
  2. Install the package withsudo dpkg -i <path-to-file>
  3. Stop Phosh with sudo systemctl stop phosh
  4. Start Capyloon with sudo systemctl start b2gos

The original PinePhone might be able to run the Debian package for the PinePhone Pro, but it should really be sluggish. The JavaScript-based front-end in Capyloon is called Nutria. As of March 25, 2022, the following features are not working, or only partially working: Audio channel management, WiFi (partial), telephony (calls, data, SMS, MMS), Bluetooth, GPS, other sensors (orientation, proximity, etc.)…

calyloon web os desktop
Capyloon on desktop

You can also try it on by installing a Debian package 64-bit x86 systems, or on Android phones with a dedicated image for the Pixel 3a or a generic system image on other devices. I was unable to locate the Apple M1 image mentioned in the release notes.

You’ll find the source code for the project on Github. More details and download links can be found on the project’s website, which funnily I had to open in Chrome, as the horizontal sliders for the screenshot would not work in Firefox.

Via Liliputing

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