SuperSubstack is a Chrome extension that enhances your Substack reading experience with better progress context, typography controls, bionic reading, a reading list, and offline article archiving.
- Adds a reading progress bar with percent complete, estimated time left, and current section context
- Offers bionic reading mode to bold the start of words, with light, medium, or strong intensity
- Lets you tune typography with reading style, font size, line spacing, content width, and a reset-to-defaults button
- Saves articles to a local reading list so you can come back to them later
- Archives Substack articles as self-contained HTML files for offline reading
The extension injects a content script into Substack article pages and applies lightweight reading helpers without permanently changing the original content. The popup gives you quick access to progress, focus, typography, reading-list, and archive controls.
manifest.json- Chrome extension configurationcontent.js- progress context, typography, bionic reading, and archiving logiccontent.css- injected styles for the reading UI and progress HUDpopup.html/popup.js- extension popup controls, typography settings, and reading list UIbackground.js- service worker for context menu and download handling
- Open
chrome://extensions - Turn on Developer mode
- Click Load unpacked
- Select this project folder
Open any Substack article, click the extension icon, and adjust the reading tools you want. You can fine-tune typography, save the article to your reading list, or archive it from the popup for offline reading later.