Broadside: Cross-posting app for Bluesky & Mastodon

I enjoy posting images to Bluesky and Mastodon, and I try to include alt text every time. I got tired of writing a post, dragging the image into Bluesky, then into Mastodon, then into my other Mastodon account, and then having to go back to paste in the alt text for each account. Posts with multiple images were an even bigger headache. To quote Heinlein, “Progress is made by lazy men looking for easier ways to do things.” So I built a thing. It’s called Broadside. A broadside is when a ship fires every cannon on one side at once. That’s the whole idea: I write a post once, attach my images, add alt text, and Broadside fires it at every Bluesky and Mastodon account I’ve got in a single click. It’s probably overkill for a single account, but if you’re juggling multiple social accounts it’s a huge quality of life improvement. Broadside is built with Flask, using the AT Protocol and Mastodon APIs, and runs in a Docker container. It also supports threaded posts, with Broadside handling the…