Kaiserapps - Web Developer Tools

Screenshots as the store published them when we checked on 1 September 2026.

Why we score it 60

• A Chrome App rather than an extension, on a platform Chrome has withdrawn.
• Has not been updated in over 13 years.

What it can access

On the sites it runs on, Kaiserapps - Web Developer Tools can reach no sites on its own.

Store rating 3.2 out of 5 from 27 people.

It asks for no special permissions beyond the sites named above.

What this was, and why it stopped

Kaiserapps - Web Developer Tools was a packaged Chrome App: it shipped its own files and ran in a window of its own, rather than as part of a web page. Chrome Apps were a separate platform from extensions, and Google withdrew it — support ended on Windows, macOS and Linux in 2022 and on ChromeOS in early 2025.

What it ran: a declaration that it worked offline.

Unlike a hosted app there is no website underneath this one to fall back on. The app was the whole program, so when the platform went, nothing was left behind it.

Its listing was still in the store when we checked on 1 September 2026. Being listed and being usable are different things, and the store does not distinguish them.

Others in this category

Nothing we track needs the same access as this one, so none of these is a direct swap. They are the maintained extensions filed under the same category.

• Tag Assistant Same category, updated within the last month, 3M+ users, on Manifest V3.
• SEOquake: On-Page SEO Checker Same category, updated within the last month, 1M+ users, on Manifest V3.
• Lighthouse Same category, updated 10 weeks ago, 1M+ users, on Manifest V3.
• Stylus Same category, updated within the last month, 1M+ users, on Manifest V3.
• User-Agent Switcher for Chrome Same category, 1M+ users, on Manifest V3.