Cerulean for Bluesky

Screenshot of release 1.0 running on Reunion7

This is the repository for Cerulean, an open-source Bluesky client. It recently exited beta and is now quite usable. It is written in C# and .NET Framework 2.0, and uses WinForms (fully native). It runs on Windows 98 and up.

OS compatibility

Windows: Official minimum is Windows 98, can run on Windows 95 with MattKC's backport. Windows 2000 or higher is recommended as it provides a much better experience.

Mac OS and Linux: Supported with WINE. No reported problems.

What Cerulean can do (so far)

Accounts: Logging in (2FA supported), account creation, resetting password, saving credentials with DPAPI encryption, initiating Age Assurance verification,
Tabs: tabbed feed browsing lets you have multiple different feeds in tabs
Posts: viewing, creating, liking, reposting/unreposting, quote posts, deleting posts, reporting posts, viewing embeds, viewing hashtags, sharing posts, permalinking to posts, opening posts/threads in browser, opening post links, collapsing posts
Feeds: timeline, discover, feed selection, tabbed feed browsing
Threads: viewing in Reddit-style UI with custom depth markers
Profiles: searching for profiles and viewing profile information, reporting profiles, following and unfollowing
Notifications: view notifications, including follows, likes and replies
Chat: view a list of your current chats
Custom servers: Cerulean is fully compatible with custom PDSes and can also create an account in said PDS if implemented server-side. Both invite-only and public PDSes are supported.

What needs to be fixed

Uploading images to posts

What needs to be added

Multiple account support
Blocking users
Searching for posts
Viewing all posts of a particular user
Starter packs
Actual functioning chat
Lists

Building Cerulean

The project is open-source, but licensed under the GPLv3 - any forks should credit both me and the Cerulean project. Cerulean is built using Microsoft Visual Studio 2010 and .NET Framework 2.0. You can use VS2026/2022/etc, but I recommend you use VS2010 due to how incredibly lightweight it is and the great improvements in performance you will notice. If you are encountering issues:

Enable .NET Framework 2.0 in Windows Features.
If you've tried that and it still doesn't work, file an issue.

Please stick to the existing code style when submitting pull requests. This includes not removing commented-out code.

Credits

Any libraries linked are .NET 2.0 versions. Some may be out of date. Find newer versions for new projects.

Jeffrey Phillips, LibCurl.NET - .NET Framework 2.x, there is an updated and greatly enhanced fork
Legion of the Bouncy Castle, BouncyCastle.Cryptography - .NET Framework 2.x, there is a newer version for modern .NET
James Newton King, Newtonsoft.Json - all versions of .NET Framework/Standard/Core supported, but largely superseded by System.Text.Json in Core
OpenSSL Library, OpenSSL - Windows 98+ build here
cURL - Windows 98+ build here
Microsoft, Windows Vista Icons / Windows 98 Icons. These assets are licensed by Cerulean under the doctrine of fair use.
NSIS-Dev, Nullsoft Scriptable Install System 2. Formerly owned and developed by Nullsoft, Inc.

Thank you!

If you made it this far, thank you. I do not have a donation option at the moment, but I may put one up eventually.

Cerulean

Install / Use

README