50+ Chrome Extension Ideas to Build in 2026

Stuck for an idea? Browse 50+ Chrome extensions worth building. Each one comes with a ready-to-use PlugThis prompt — copy, paste, build, ship.

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)

#1

Focus Mode Blocker

Block selected websites during focus hours.

#2
Coming soon

Tab Reminder

Get reminded about tabs you've left open too long.

Prompt in the works.
#3
Coming soon

Bookmark AI Tagger

Auto-tag your bookmarks using AI.

Prompt in the works.
#4
Coming soon

Daily Goal Tracker

A new-tab page showing your top 3 goals for the day.

Prompt in the works.
#5
Coming soon

Time Spent Tracker

See how much time you spent on each domain this week.

Prompt in the works.
#6

Pomodoro Timer with Site Blocking

Pomodoro intervals that block distracting sites.

#7

Quick Notes Sidebar

Take per-page notes that persist across visits.

#8
Coming soon

Tab Group Auto-Sorter

Automatically sort open tabs into groups by domain.

Prompt in the works.
#9
Coming soon

One-Click Inbox Zero

Archive all read emails in Gmail with one click.

Prompt in the works.
#10
Coming soon

Meeting Time Calculator

Sum up time spent in calendar meetings this week.

Prompt in the works.

AI-powered tools (10 ideas)

#11

Page Summarizer

3-bullet summaries of any article using GPT-4.

#12

Selection Translator

Translate highlighted text on any page.

#13
Coming soon

AI Email Reply Drafter

Generate email replies from inbox preview.

Prompt in the works.
#14
Coming soon

Tweet Improver

Polish drafts before posting on X.

Prompt in the works.
#15

AI Form Filler

Fill forms intelligently using profile data.

#16
Coming soon

Article Question Answerer

Ask questions about any open article.

Prompt in the works.
#17

YouTube Comment Summarizer

Summarize the comments section of any video.

#18
Coming soon

Reading Difficulty Estimator

Show grade level and reading time for any article.

Prompt in the works.
#19
Coming soon

Code Explainer

Explain selected code in plain English on GitHub.

Prompt in the works.
#20
Coming soon

AI Search Result Summarizer

Summarize Google's top 5 results in a sidebar.

Prompt in the works.

Developer tools (8 ideas)

#21
Coming soon

JSON Pretty Printer

Format JSON inline on any page.

Prompt in the works.
#22
Coming soon

API Endpoint Tester

Quick API request runner from the toolbar.

Prompt in the works.
#23
Coming soon

Color Picker with History

Pick colors from any page, save to a palette.

Prompt in the works.
#24
Coming soon

CSS Inspector Pro

Better element inspection with copy-to-clipboard.

Prompt in the works.
#25

GitHub Repo File Counter

Show line counts and file types for any repo.

#26
Coming soon

Page Performance Score

Show Core Web Vitals for any page on demand.

Prompt in the works.
#27
Coming soon

Cookie Inspector

View and edit cookies for the current site.

Prompt in the works.
#28
Coming soon

Local Storage Inspector

Browse and edit localStorage for any site.

Prompt in the works.

E-commerce and shopping tools (7 ideas)

#29

Amazon Price Tracker

Track price history on Amazon products.

#30
Coming soon

Coupon Code Auto-Applier

Auto-apply best coupon at checkout.

Prompt in the works.
#31
Coming soon

Wishlist Across Sites

Save products from any site to one wishlist.

Prompt in the works.
#32
Coming soon

Review Trustworthiness Score

Estimate fake-review percentage on listings.

Prompt in the works.
#33
Coming soon

Currency Converter on Hover

Convert any price to your home currency.

Prompt in the works.
#34
Coming soon

Shipping Cost Comparator

Compare shipping options across retailers.

Prompt in the works.
#35
Coming soon

Sustainable Shopping Score

Rate products for sustainability on hover.

Prompt in the works.

Content creator tools (8 ideas)

#36
Coming soon

Twitter Lead Scorer

Rate replies on X tweets by lead potential.

Prompt in the works.
#37
Coming soon

YouTube Tag Explorer

See competitor video tags.

Prompt in the works.
#38

LinkedIn Post Drafter

Generate LinkedIn posts from selected text.

#39
Coming soon

Instagram Caption AI

Generate captions from images.

Prompt in the works.
#40
Coming soon

Newsletter Subscriber Finder

Find emails of newsletter subscribers via Substack.

Prompt in the works.
#41
Coming soon

Content Idea Generator

Generate content ideas based on the page you're on.

Prompt in the works.
#42
Coming soon

Hashtag Recommender

Suggest hashtags for the current draft.

Prompt in the works.
#43
Coming soon

YouTube Shorts Idea Mining

Find Shorts ideas from any YouTube channel.

Prompt in the works.

Research and learning tools (7 ideas)

#44

Citation Generator

Generate citations for any webpage in APA/MLA/Chicago.

#45
Coming soon

PDF Annotator

Annotate PDFs in the browser with comments.

Prompt in the works.
#46
Coming soon

Study Flashcard Maker

Turn highlighted text into flashcards.

Prompt in the works.
#47
Coming soon

Source Credibility Checker

Check the credibility of news sources.

Prompt in the works.
#48
Coming soon

Wikipedia Better Reader

Cleaner, distraction-free Wikipedia.

Prompt in the works.
#49
Coming soon

Research Paper Tracker

Save and tag research papers across sites.

Prompt in the works.
#50

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.

Frequently asked questions

Are these ideas free to build with PlugThis?

Yes — within the free tier limits. The free tier is enough for 1–2 of these. After that, upgrade to a lifetime plan to keep building.

Can I publish extensions I build from these prompts?

Yes. You own the code PlugThis generates. Publish to the Chrome Web Store and even monetize them.

Can I modify these prompts before building?

Yes. The prompts are starting points — adapt them to fit your specific use case.

Are any of these already on the Chrome Web Store?

Some have similar competitors. That's fine — your version is your own. Differentiate on UX, focus, or specific niche.

Which idea should I start with as a beginner?

"Quick Notes Sidebar" (#7) — it's small, useful, and teaches you content scripts plus storage in one extension.

Ready to build your Chrome extension?

Describe what you want in plain English. PlugThis ships production-ready Manifest v3 code in under two minutes.

Start building free