Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
browsersupport.io is a browser compatibility lookup site for frontend and JavaScript developers, focused specifically on compatibility tables for ECMAScript and JavaScript APIs. Its positioning is clearly different from caniuse.com: caniuse.com has broader coverage, while browsersupport.io focuses only on JavaScript-related properties and aims to be as comprehensive as possible. Its current database contains around 45,000 properties.
Based on the main content, it includes not only popular, modern, well-specified APIs, but also browser-specific APIs, vendor-prefixed APIs, and deprecated APIs. The site emphasizes that it does not omit properties simply because “everyone knows they are supported” or “almost nobody supports them.” This is valuable for troubleshooting edge-case compatibility issues, working with legacy code, or studying differences between JavaScript runtimes. Examples include NaN, Object.entries, and String.prototype.trimStart.
The site is currently in beta, and its property testing is “shallow”: if a property exists, it is reported as supported, even if the implementation has bugs that may not be reflected. Browser issue reporting is still on the roadmap. As a result, it is better suited as a quick reference for whether an API exists, rather than as the sole basis for critical compatibility decisions.
The main text does not mention pricing, subscriptions, or an enterprise edition, so it can currently be regarded as a free information lookup tool. It provides a GitHub feedback channel where users can submit issues, add missing properties, or discuss feature suggestions. However, the text does not state whether the code or data is open source, nor does it mention APIs, SDKs, self-hosting, IDE integrations, CI, or build tool integrations.
Its strengths are its focused positioning and detailed coverage, especially for checking compatibility of obscure JavaScript properties. Its weaknesses are the limited depth of data validation and the lack of documentation and integration information. It is suitable for frontend engineers, library authors, compatibility researchers, and teams that need to maintain legacy browsers or historical codebases.
The crawled text does not provide information about access from mainland China, network stability, or payment, so its accessibility from China is unknown. Alternatives include caniuse.com and other browser compatibility databases. If you need a more mature ecosystem and coverage beyond JavaScript features, caniuse.com may be a better fit.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on browsersupport.io official site.
browsersupport.io is an Unknown Dev Tools provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach browsersupport.io directly.