AutoAlt is a free Chrome extension designed to simplify the process of generating alt text for images posted on bsky.app. By utilizing AI vision models, users can create meaningful alt text with just one click. The extension supports multiple AI providers, allowing users to bring their own API keys, including options like Google Gemini, OpenAI, Anthropic, and Ollama. With the default setup, users can quickly transcribe text from images and receive a concise description when no text is present. This functionality enhances accessibility for blind and low-vision users by ensuring that images are described adequately.

The setup process is straightforward, requiring users to select their preferred provider and enter their API key. Generated alt text is cost-effective, with cloud options costing only a fraction of a cent per image, and Google’s tier often making it free. AutoAlt prioritizes user privacy by storing API keys locally and sending images directly to the selected AI provider without tracking or analytics. Open-source and MIT licensed, AutoAlt promotes accessibility and transparency in image description for social media.