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Generate editable alt text for images in the bsky.app post composer using your chosen AI service. AutoAlt makes it one-click easy to write good alt text for the images you post on bsky.app — using AI vision models you bring your own key for. When you attach an image to a Bluesky post, a small ✨ Auto button appears next to Bluesky's own +ALT chip. Click it. A second or two later, the alt-text field is filled. The default prompt prioritizes transcribing any text visible in the image (memes, screenshots, signs, diagrams) and falls back to a short description if there's no text. You can edit the alt text afterward, and you can fully customize the prompt in Settings. ✦ USE YOUR CHOSEN AI SERVICE ✦ Choose from multiple supported cloud services, or use a compatible service running locally. For cloud services, you supply your own API key; AutoAlt has no developer-operated backend. You can change the model name in Settings. ✦ COSTS A FRACTION OF A CENT ✦ Generating alt text for one image costs roughly $0.0002–$0.003 on cloud providers — fractions of a cent. For most people, Google Gemini's free tier means it's effectively free. ✦ PRIVACY POSTURE ✦ • Your API keys are stored only on your device, in Chrome's local storage. They never reach the extension's developer — we have no backend. • Images are sent ONLY to the AI provider you chose, directly from your browser. No middleman, no analytics, no telemetry, no tracking, no ads. • Open source. Every claim above can be verified by reading the code: https://github.com/sjennings/autoalt ✦ HOW TO SET UP ✦ 1. Click the AutoAlt toolbar icon → Settings 2. Pick your provider (Google's free tier is the easiest start) 3. Paste your API key 4. Click Save 5. Open bsky.app, attach an image to a post, click the ✨ Auto button For Ollama users, see the project README for the few extra steps needed to allow Chrome extensions to talk to your local Ollama server. ✦ ACCESSIBILITY ✦ Alt text isn't decoration — it's how blind and low-vision Bluesky users actually read images. Posting images without alt text excludes those users entirely. AutoAlt exists to lower the friction so there's no excuse to skip it. Generated alt text is a starting point you can edit, not a substitute for thinking about your audience. ✦ OPEN SOURCE ✦ MIT licensed. Source, issue tracker, and full privacy policy at https://github.com/sjennings/autoalt Also available for Firefox: https://addons.mozilla.org/en-US/firefox/addon/autoalt-alt-text-for-bsky-app/ ✦ UPDATES ✦ 0.2.2: fixed "Auto ✨" button appearing in post field sometimes when pasting an image. 0.3.1: added support for Openrouter and current leading Chinese image models.