SkyDroid • Decentralized App Store
SkyDroid is a decentralized domain-based Android App Store which offers easy and fast app distribution, discoverability and security through collections, multi-language support, multiple Themes, Search and Filter options, nice error handling and of course a good user experience.
SkyDroid uses native code from https://github.com/Aefyr/SAI (GPL-3.0).
Install + First Steps
- Visit https://get.skydroid.app on your Android device
- Open the downloaded APK file and install it
- Open SkyDroid and go to "Collections"
- Add some recommended Collections
- Navigate back to "Apps" and enjoy!
How to publish your own app
Here's a little demo of the app and how it works: https://youtu.be/MTSrz3Jb778?t=2461
Why it's important
Fair and secure app distribution is currently more important than ever. (see the current news about the Apple App Store and Google Play)
SkyDroid aims to fix this problem on Android by making direct app distribution decentralized, convenient to use, affordable and secure.
Every app on SkyDroid is offered through a specific domain. Handshake Domains are also fully supported to allow full decentralization.
For example the domain
noteless.redsolver has a
TXT record with the following content:
skydroid-app= part tells SkyDroid, that this Domain/Name contains an App.
1 is the version of this record format.
AADbpx41U1UCRcIhSHvzRAgt8LJYaDlxiLyqHnPj8ckXAA part is a Skylink (explained in a moment) which points to the metadata file of the app.
0a2e07bb2666409ceb6f49072e296d6ca4f2050af098da1cf6d17fd09b49e6cc part is a sha256 hash of the metadata file to ensure the integrity.
Ok, but what is a Skylink?
A Skylink points to a file on the Sia Skynet. The Sia Skynet is a decentralized CDN and file sharing platform for devs.
A file which is uploaded to one portal, can be downloaded from any other portal!
This enables fully decentralized file-sharing, because the uploader can use any portal or even directly upload to Skynet and also the user can choose between any of the portals!
Skylinks must be used for the metadata files and can be used for the app icon, images and the APK files.
Ok, so back to the metadata file!
If you add
noteless.redsolver in SkyDroid, the apps checks the TXT records of the name like explained above and then downloads the metadata file.
You can choose any Skynet portal of your choice in the SkyDroid settings.
The metadata file is checked against the hash and then the app is shown in the UI.
When a SkyDroid user wants to check for updates of all apps, only the
TXT records need to be checked.
Only if a new metadata hash is found, the metadata file is downloaded again and applied.
A collection in SkyDroid has two main goals:
- Offer a way to discover apps
- Offer a decentralized trust-system for apps
A collection metadata file is loaded exactly like an app metadata file from a domain name (for example
but it uses
skydroid-collection= instead in the
A collection can be made by anyone.
It usually contain's multiple curated Domains/Names from SkyDroid apps which the collection author wants to recommend.
For example, a developer could have a collection of his own apps and some other apps he found and finds nice.
When the SkyDroid user adds the collection, every app in it is added as well.
Some collections are "recommended" by me in the app to get the user started fast, but any collection can be added easily by simply pressing the "Add" button and entering the Domain/Name.
Collections can also "verify" apps they list. That basically means putting the hash of the app metadata to the name.
This allows security researchers or companies to check the app and mark it as "secure".
This system can also be used for other "verification" to for example check if an app is good or not.
The user can see how many and which collections verified the app in the current state on the "App Page".
Metadata file examples
redsolver collection metadata file (can be JSON or YAML):
title: red's collection description: This collection contains every app available via SkyDroid that I'm aware of. Some apps are verified. icon: sia://PAGUwiKmHy_83Att8NssAMj79PF1V8g5x_B2lKyThFhKig apps: - name: noteless.redsolver verifiedMetadataHashes: [ f7922a73001a8838db29aa4eea5bc91244c07b65fd9a2f1bad16b6a491308af4, 4bd9b5ad567784b4defa02a892794b28b4acc0b8e32b6c2e996f955280cfed02, f06c6781e7964ab458903594189734216a06f71bc820d2816c3f5347cff72fd5, 0a2e07bb2666409ceb6f49072e296d6ca4f2050af098da1cf6d17fd09b49e6cc, ] - name: skydroid.app verifiedMetadataHashes: [bdcbc30b582a078deaea5c6c12f8d265ca22922e5143bb63974e91871de343fe]
noteless.redsolver app metadata file (can be JSON or YAML):
categories: - Writing license: MIT authorName: redsolver authorEmail: email@example.com sourceCode: https://github.com/redsolver/noteless issueTracker: https://github.com/redsolver/noteless/issues changelog: https://github.com/redsolver/noteless/blob/HEAD/CHANGELOG.md name: Noteless packageName: net.redsolver.noteless icon: https://github.com/redsolver/noteless/raw/master/assets/icon/icon.png localized: en-US: description: |- Features * Markdown-optimized editor with syntax highlighting * Supports Github Flavored Markdown, KaTeX and mermaidjs for diagrams * Tags for organizing your notes * Pin, Star and sort your notes by title or different dates * Very themable - dark/light mode and accent color * Full-text search * File Attachments that can be embedded into a note * Multi-Note Editing * Slide actions for easier editing * Tutorial notes which explain how to use the app summary: A markdown note-taking app for mobile devices. whatsNew: "First release on SkyDroid, yay!" phoneScreenshotsBaseUrl: https://github.com/redsolver/noteless/raw/master/screenshots/ phoneScreenshots: - screen1.png - screen2.png - screen3.png - screen4.png - screen5.png - screen6.png - screen7.png - screen8.png - screen9.png - screen10.png - screen11.png - screen12.png builds: - versionName: 0.3.2 versionCode: 32 sha256: 0a5d15f00554e982e37ed9bdda41d17304e8f056913a8d0921a11d81844578e9 apkLink: sia://AADTpnQ7qv4aFsJYTJECT8e8428kGgLmwLUWgqdycvquFg - versionName: 1.0.0 versionCode: 100 sha256: d56dccb20c45e84089560a8d7611eeb9a55a15647fa06aee822364f39c753a69 apkLink: sia://AABBdXkn8Ogia55qK2vvYLRecYY2U-sKyTx0SoD8c6DOKQ currentVersionName: 1.0.0 currentVersionCode: 100 added: 1596499200000 lastUpdated: 1596737665000
The screenshots and app icon can also be hosted on the Sia Skynet. (Just use
sia:// instead of
https://, it gets automatically replaced with the selected Skynet Portal)
How to publish your own app (manual method)
- Copy the contents of
minimal-app-template.yamlto a new YAML file on your computer
- Edit all values to match your app
- You can upload your APK file and media files to https://siasky.net or just use a normal https link if they are already hosted on GitHub for example
- Get the hash of the metadata file by running
sha256sum your-app-file.yamlin your terminal or using a sha256 website like this one
- Upload your YAML file to https://siasky.net
Build a TXT Record like this:
- Add this TXT Record to a domain/name of your choice. (You can use a normal or a Handshake domain)
- Add you domain/name in the SkyDroid app with the "Plus"-button in the bottom right
This app was initially developed as a submission to the ‘Own The Internet’ Hackathon.
- QR-Code Sharing of Apps
- Some sort of decentralized Rating System (maybe via Mastodon)
- Maybe use Shizuku service like https://github.com/Aefyr/SAI to enable automatic background updates (if verified).
Oh, and the app is written in Flutter - making the SkyDroid App Store available on Windows, macOS or Linux is possible.