O
Open Inspector
Inspect any page with no site access requested — a free, MIT, privacy-first browser extension for developers and designers.
Free · MIT · no account0 host permissions0 network requests946 testsWorks offline, always
Opportunity score
38/100
Technically thoughtful and highly differentiated, but the explicit no-network/no-payment model makes it a weak standalone revenue business, though it creates an adjacent enterprise opportunity.
Founder verdict
NO
A high-trust open-source tool with an intentional non-business model; it is a product to learn from and build beside, not a startup to clone.
What is Open Inspector?
Open Inspector is a free, MIT-licensed Chromium extension that positions itself as the only web inspector that requests zero host permissions. The landing page leans on verifiable technical claims: activeTab and scripting only, no host_permissions key, zero network requests, 946 tests, and readable source code. It targets frontend developers, designers, accessibility auditors, and security-conscious teams with deep inspection panels for Styles, Color, Type, Layout, Assets, Markup, and Export, plus WCAG contrast auditing and design token export. The product is well-differentiated against CSS Peeper and Hoverify, but the business model is explicitly donation-only, with no paid tier and no observed revenue.
Get the full Open Inspector playbook
The complete reverse-engineering — what to copy, what to avoid, and exactly what to build instead.
- Full opportunity score across 8 dimensions
- The real problem & why customers pay
- Why it's winning — with evidence
- Complete business reverse-engineering
- Competitive advantages & moat analysis
- Weaknesses, risks & what to avoid
- Clone strategy — what to build instead
- Week-by-week MVP roadmap
- Recommended technical stack
- Founder verdict & highest-leverage move