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" link that opens a page with the full prompt and a one-click build button
  • The full PlugThis prompt — copy it as-is or tweak it

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.

Build this See full prompt
#2

Tab Reminder

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

Build this See full prompt
#3

Bookmark AI Tagger

Auto-tag your bookmarks using AI.

Build this See full prompt
#4

Daily Goal Tracker

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

Build this See full prompt
#5

Time Spent Tracker

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

Build this See full prompt
#6

Pomodoro Timer with Site Blocking

Pomodoro intervals that block distracting sites.

Build this See full prompt
#7

Quick Notes Sidebar

Take per-page notes that persist across visits.

Build this See full prompt
#8

Tab Group Auto-Sorter

Automatically sort open tabs into groups by domain.

Build this See full prompt
#9

One-Click Inbox Zero

Archive all read emails in Gmail with one click.

Build this See full prompt
#10

Meeting Time Calculator

Sum up time spent in calendar meetings this week.

Build this See full prompt

AI-powered tools (10 ideas)

#11

Page Summarizer

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

Build this See full prompt
#12

Selection Translator

Translate highlighted text on any page.

Build this See full prompt
#13

AI Email Reply Drafter

Generate email replies from inbox preview.

Build this See full prompt
#14

Tweet Improver

Polish drafts before posting on X.

Build this See full prompt
#15

AI Form Filler

Fill forms intelligently using profile data.

Build this See full prompt
#16

Article Question Answerer

Ask questions about any open article.

Build this See full prompt
#17

YouTube Comment Summarizer

Summarize the comments section of any video.

Build this See full prompt
#18

Reading Difficulty Estimator

Show grade level and reading time for any article.

Build this See full prompt
#19

Code Explainer

Explain selected code in plain English on GitHub.

Build this See full prompt
#20

AI Search Result Summarizer

Summarize Google's top 5 results in a sidebar.

Build this See full prompt

Developer tools (8 ideas)

#21

JSON Pretty Printer

Format JSON inline on any page.

Build this See full prompt
#22

API Endpoint Tester

Quick API request runner from the toolbar.

Build this See full prompt
#23

Color Picker with History

Pick colors from any page, save to a palette.

Build this See full prompt
#24

CSS Inspector Pro

Better element inspection with copy-to-clipboard.

Build this See full prompt
#25

GitHub Repo File Counter

Show line counts and file types for any repo.

Build this See full prompt
#26

Page Performance Score

Show Core Web Vitals for any page on demand.

Build this See full prompt
#27

Cookie Inspector

View and edit cookies for the current site.

Build this See full prompt
#28

Local Storage Inspector

Browse and edit localStorage for any site.

Build this See full prompt

E-commerce and shopping tools (7 ideas)

#29

Amazon Price Tracker

Track price history on Amazon products.

Build this See full prompt
#30

Coupon Code Auto-Applier

Auto-apply best coupon at checkout.

Build this See full prompt
#31

Wishlist Across Sites

Save products from any site to one wishlist.

Build this See full prompt
#32

Review Trustworthiness Score

Estimate fake-review percentage on listings.

Build this See full prompt
#33

Currency Converter on Hover

Convert any price to your home currency.

Build this See full prompt
#34

Shipping Cost Comparator

Compare shipping options across retailers.

Build this See full prompt
#35

Sustainable Shopping Score

Rate products for sustainability on hover.

Build this See full prompt

Content creator tools (8 ideas)

#36

Twitter Lead Scorer

Rate replies on X tweets by lead potential.

Build this See full prompt
#37

YouTube Tag Explorer

See competitor video tags.

Build this See full prompt
#38

LinkedIn Post Drafter

Generate LinkedIn posts from selected text.

Build this See full prompt
#39

Instagram Caption AI

Generate captions from images.

Build this See full prompt
#40

Newsletter Subscriber Finder

Find emails of newsletter subscribers via Substack.

Build this See full prompt
#41

Content Idea Generator

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

Build this See full prompt
#42

Hashtag Recommender

Suggest hashtags for the current draft.

Build this See full prompt
#43

YouTube Shorts Idea Mining

Find Shorts ideas from any YouTube channel.

Build this See full prompt

Research and learning tools (7 ideas)

#44

Citation Generator

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

Build this See full prompt
#45

PDF Annotator

Annotate PDFs in the browser with comments.

Build this See full prompt
#46

Study Flashcard Maker

Turn highlighted text into flashcards.

Build this See full prompt
#47

Source Credibility Checker

Check the credibility of news sources.

Build this See full prompt
#48

Wikipedia Better Reader

Cleaner, distraction-free Wikipedia.

Build this See full prompt
#49

Research Paper Tracker

Save and tag research papers across sites.

Build this See full prompt
#50

Dictionary Lookup on Highlight

Define any highlighted word in a tooltip.

Build this See full prompt

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

Question 01

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 paid plan from $29/month to keep building.

Question
FAQ

More answers below.

Question 02

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.

Chrome Web Store
Chrome Web Store
Listing · Ready to publish
Live
Your extension
Manifest v3 compliant
One-click .zip upload
Approval in days
Question 03

Can I modify these prompts before building?

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

Question
FAQ

More answers below.

Question 04

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.

Chrome Web Store
Chrome Web Store
Listing · Ready to publish
Live
Your extension
Manifest v3 compliant
One-click .zip upload
Approval in days
Question 05

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.

Question
FAQ

More answers below.

Related resources

  1. 01
    No Code Chrome Extension
  2. 02
    Chrome Extension Tutorial
  3. 03
    Build Without Coding
  4. 04
    Free Chrome Extension Builder

Ready to build your Chrome extension?

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