Think of it like spell check for accessibility. When you're ready, just click to run a check and Successible scans your emails, landing pages, and posts for the issues that most commonly leave people behind — missing alt text, color contrast failures, skipped heading levels, missing video captions, and more. When it finds something, it tells you what's wrong and why it matters, in plain language you can actually use. 

Install it once. Keep building the way you already do. Run a check whenever you're ready to publish.