Built That Extension
Discover 9500+ expired Chrome extensions with proven user demand
What is Built That Extension? Complete Overview
Built That Extension provides a curated database of over 9500 expired Chrome extensions, each with at least 500 users before being removed from the Chrome Web Store. This tool is designed for developers, indie hackers, and entrepreneurs looking for validated extension ideas with existing market demand. The extensions were removed due to Google's transition from Manifest V2 to Manifest V3, not because of lack of user interest. The database saves weeks of market research by offering ready-to-explore opportunities with real user data, including extension names, descriptions, user counts, ratings, and Chrome Store URLs. It's an invaluable resource for anyone looking to build a Chrome extension with a proven concept.
Built That Extension Interface & Screenshots
Built That Extension Official screenshot of the tool interface
What Can Built That Extension Do? Key Features
Curated Database of Expired Extensions
Access a comprehensive list of 9500+ Chrome extensions that were removed from the store but had significant user bases (500+ users each). This database includes detailed information such as extension names, descriptions, user counts, ratings, and original store URLs.
Validated Market Demand
Every extension in the database had at least 500 active users before being removed, proving there was genuine interest and demand for these tools. This validation helps you avoid building extensions for non-existent markets.
Gap Analysis Opportunities
Identify extensions with loyal user bases that were abandoned when developers didn't update to Manifest V3. These represent ready-made opportunities to fill market gaps with improved versions of previously successful extensions.
Time-Saving Research Tool
Skip weeks or months of market research by starting with a database of proven concepts. The CSV file organizes all the data you need to quickly evaluate and compare potential extension ideas.
Detailed Extension Metrics
Get access to crucial metrics for each expired extension, including total users, average rating, number of ratings, and the original Chrome Store link. This data helps you assess the potential of each idea quickly.
Best Built That Extension Use Cases & Applications
Indie Developer Seeking Proven Ideas
An independent developer uses the database to find extension concepts with demonstrated demand but no current maintenance. They identify a productivity extension with 6,000 users that was abandoned, then build an improved version with modern features.
Startup Validating Product Ideas
A startup team explores the database to validate potential extension ideas before development. They find multiple extensions in their target niche with strong user bases, confirming market demand before investing in development.
Marketing Research for Browser Tools
A market researcher analyzes the database to identify trending categories and features in Chrome extensions. They discover patterns in what users valued in now-expired extensions to inform new product development.
How to Use Built That Extension: Step-by-Step Guide
Download the CSV file containing the database of 9500+ expired Chrome extensions from the Built That Extension website.
Open the CSV file in your preferred spreadsheet software (Excel, Google Sheets, etc.) to browse through the extensive list of expired extensions.
Filter and sort the data based on your criteria - look for extensions with high user counts, good ratings, or in categories that interest you.
Research the most promising extensions further by examining their original Chrome Store pages (links provided) to understand their features and user feedback.
Select one or more extension ideas to develop, using the proven concept as a foundation while improving upon the original implementation.
Built That Extension Pros and Cons: Honest Review
Pros
Considerations
Is Built That Extension Worth It? FAQ & Reviews
Most were removed due to Google's transition from Manifest V2 to Manifest V3. Developers who didn't update their extensions to the new standard had their extensions disabled, regardless of user demand or extension quality.
The database contains extensions that were removed during the Manifest V2 to V3 transition period. While not constantly updated, these represent a snapshot of validated extension ideas that previously had active user bases.
Yes, while you can't copy trademarked names or exact implementations, the concepts and functionality of these expired extensions can serve as inspiration for new, improved versions that meet current Chrome extension standards.
The database is provided as a CSV (Comma-Separated Values) file, which can be opened in any spreadsheet software like Excel, Google Sheets, or Numbers.
The data is provided for research and inspiration purposes. While you can use it to inform your own extension development, you should create original implementations rather than copying existing extensions directly.