TumblThree is a free and open-source Windows desktop application, written in C# with WPF, that downloads photo, video, audio and text posts from a given Tumblr or Twitter blog and keeps that content locally.

What it is

TumblThree is a blog backup and download application distributed as source code on GitHub and as ready-to-run releases. It is the code rewrite of TumblTwo, rebuilt on the Win Application Framework (WAF) using C# with WPF and the MVVM pattern. It lives in the Windows desktop ecosystem and targets Tumblr and Twitter blogs, with support for Bluesky user feeds added more recently.

The concrete problem it solves is that blog content sits on servers the blog owner does not control, where posts, media and meta information can become difficult to retrieve or preserve. TumblThree replaces TumblTwo and the manual labour of saving posts and media by hand with a queue-driven downloader that walks a blog's posts, resolves their linked media, and writes the results to a local folder. It handles the awkward cases specifically: hidden blogs behind a login, password-protected blogs, safe mode and NSFW blogs, inlined media inside question-and-answer posts, and third-party file hosts embedded in Tumblr posts.

Key capabilities

• Downloads photo, video (only tumblr.com-hosted), text, audio, quote, conversation, link and question posts, plus meta information for photo, video and audio posts and inlined photos and videos.
• Clipboard monitor detects blogname.tumblr.com URLs copied to the clipboard and adds the blog to the bloglist automatically, while multiple concurrent downloads run against a single blog or several different blogs.
• Settings panel controls download location, preview on/off, number of concurrent downloads, download defaults, image size and portable mode; a bandwidth throttler, Windows proxy settings and a scheduled start time cover slow or off-hours downloads.
• Skips a file if it has already been downloaded before in any currently added blog, groups blogs into collections, renames files, previews photos and videos, and provides an image viewer with slideshow mode.
• Download queue with autosave of the queuelist and options to save, clear and restore it, alongside taskbar buttons, key bindings and an automated update process.
• Filtering and scope controls: original content only with reblogged posts skipped, tagged posts only, specific blog pages instead of the whole blog, a defined time span, and hidden, password-protected or safe mode blogs.
• Resolves Imgur, Gfycat, Webmshare, Uguu and Catbox linked files inside Tumblr posts, fetches GIFs instead of WebP/Gifv images, and downloads liked-by and Likes listings. Internationalization covers several languages.

Who uses it and how

• Individuals archiving personal or followed Tumblr and Twitter blogs on Windows, including hidden blogs that require a login or dash board access.
• Users on constrained or metered connections, who depend on the bandwidth throttler, Windows proxy settings and a scheduled start time such as overnight runs.
• Researchers and collectors working with narrow slices of a blog, using tag, page and time span filters to pull only original or tagged content.
• Multi-blog operators who group blogs into collections and change settings across multiple selected blogs at once.
• C# and .NET contributors, since the repository labels itself first-timers-only friendly and welcomes pull requests and contributions.

Getting started

There is no package manager entry or container image; obtain a build from the GitHub releases page at github.com/TumblThreeApp/TumblThree/releases or compile the source with the .NET and WPF toolchain. The project homepage is https://TumblThreeApp.github.io.

How it compares

The only comparable tool named in the facts is TumblTwo, the predecessor this project rewrites and succeeds, so within this registry TumblThree sits as the maintained lineage of that tool rather than as an alternative to a named paid product. No paid or hosted backup service is listed for contrast.

When to use it — and when not to

Choose TumblThree when the job is archiving Tumblr, Twitter or Bluesky content to a local Windows machine with fine control over concurrency, filtering and scheduling. Do not choose it for headless, server-side or cross-platform archiving, since it is a WPF desktop application tied to Windows and requires a login for hidden blogs; video downloads are limited to tumblr.com-hosted files, and higher-resolution images are not available for older blogs. The repository carries 38 open issues, and anyone needing a documented release cadence should check the releases page rather than assume one.