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Paste text on the left and it's split into posts of up to 300 characters, breaking at sentences where it can and keeping posts roughly even. Add images to any post, then post the whole thread at once.
Use an app password, not your main password. Create one in Bluesky just for Splitter, so you can revoke it anytime. It's sent only to Bluesky, and saved in this browser only if you tick "Remember" — any other page on this address can read a saved password.
To install on an iPhone or iPad, open this page in Safari, sign in there, then Share → Add to Home Screen. A home-screen app has its own storage and can't finish the sign-in redirect.