How to use this list
Each idea below has:
- A name and 1-line description
- A "Build this" button that opens PlugThis with the prompt pre-filled
- A "See full prompt" link to the full
/extensions/[slug]page
Pick an idea, click Build, and you have the extension running in your browser within 5 minutes.
Productivity tools (10 ideas)
Tab Reminder
Get reminded about tabs you've left open too long.
Bookmark AI Tagger
Auto-tag your bookmarks using AI.
Daily Goal Tracker
A new-tab page showing your top 3 goals for the day.
Time Spent Tracker
See how much time you spent on each domain this week.
Pomodoro Timer with Site Blocking
Pomodoro intervals that block distracting sites.
Tab Group Auto-Sorter
Automatically sort open tabs into groups by domain.
One-Click Inbox Zero
Archive all read emails in Gmail with one click.
Meeting Time Calculator
Sum up time spent in calendar meetings this week.
AI-powered tools (10 ideas)
AI Email Reply Drafter
Generate email replies from inbox preview.
Tweet Improver
Polish drafts before posting on X.
Article Question Answerer
Ask questions about any open article.
Reading Difficulty Estimator
Show grade level and reading time for any article.
Code Explainer
Explain selected code in plain English on GitHub.
AI Search Result Summarizer
Summarize Google's top 5 results in a sidebar.
Developer tools (8 ideas)
JSON Pretty Printer
Format JSON inline on any page.
API Endpoint Tester
Quick API request runner from the toolbar.
Color Picker with History
Pick colors from any page, save to a palette.
CSS Inspector Pro
Better element inspection with copy-to-clipboard.
Page Performance Score
Show Core Web Vitals for any page on demand.
Cookie Inspector
View and edit cookies for the current site.
Local Storage Inspector
Browse and edit localStorage for any site.
E-commerce and shopping tools (7 ideas)
Coupon Code Auto-Applier
Auto-apply best coupon at checkout.
Wishlist Across Sites
Save products from any site to one wishlist.
Review Trustworthiness Score
Estimate fake-review percentage on listings.
Currency Converter on Hover
Convert any price to your home currency.
Shipping Cost Comparator
Compare shipping options across retailers.
Sustainable Shopping Score
Rate products for sustainability on hover.
Content creator tools (8 ideas)
Twitter Lead Scorer
Rate replies on X tweets by lead potential.
YouTube Tag Explorer
See competitor video tags.
Instagram Caption AI
Generate captions from images.
Newsletter Subscriber Finder
Find emails of newsletter subscribers via Substack.
Content Idea Generator
Generate content ideas based on the page you're on.
Hashtag Recommender
Suggest hashtags for the current draft.
YouTube Shorts Idea Mining
Find Shorts ideas from any YouTube channel.
Research and learning tools (7 ideas)
Citation Generator
Generate citations for any webpage in APA/MLA/Chicago.
PDF Annotator
Annotate PDFs in the browser with comments.
Study Flashcard Maker
Turn highlighted text into flashcards.
Source Credibility Checker
Check the credibility of news sources.
Wikipedia Better Reader
Cleaner, distraction-free Wikipedia.
Research Paper Tracker
Save and tag research papers across sites.
Dictionary Lookup on Highlight
Define any highlighted word in a tooltip.
Pick one and start building
The fastest way to learn what's possible with Chrome extensions is to build one. Pick any idea from this list, click "Build this," and you'll have a working extension running in your browser in under five minutes. From there, customize, ship, share, or move on to the next idea.