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DevDocs

Free

Fast, offline, and free documentation browser for developers. Search 100+ docs in one web app including HTML, CSS, JavaScript, PHP, Ruby, Python, Go, C, C++, and many more.

Catalogued April 15, 2026 · Curated by PWA Directory team

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📚DevDocs

devdocs.io

DevDocs, as it opens in a browser tab.

Works Offline

Installable

Cross-Platform

✓

Free

Not sure how to add DevDocs to your home screen? Step-by-step for Chrome, Safari, Firefox and Edge — it takes about ten seconds, and there is no app store involved.

Own DevDocs? Have us re-run this measurement — we open it in a real browser, cut the network, and send you what survived.

How to install DevDocs as a PWA

Chrome / Edge

Menu (⋮) → Add to Home screen

Safari (iOS)

Share (↑) → Add to Home Screen

Firefox

Menu (⋮) → Install

Screenshots

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DevDocs in our guides

How to Use DevDocs Offline for API ReferencesDevDocs offline access happens automatically once you have opened a documentation set while connected to the internet. The browser then caches that content locally, so devdocs.io keeps working without a connection for any docs you already loaded. According to its own description, DevDocs bundles more than 100 references, including HTML, CSS, JavaScript, PHP, Ruby, Python, Go, C and C++, in one free web app. It won't refresh a cached doc set on its own, so you still need to reconnect occasionally to pick up source updates.Read the answer →

Is JWT.io Safe to Paste Your JWT Into?Yes, jwt.io is safe for everyday debugging, but never paste a live production token into it or any other tool. The site decodes JSON Web Tokens right in your browser tab and shows you the header, payload and signature so you can check them yourself. Asking is jwt.io safe before you paste something is the right instinct, since the debugger never requires an account or a paid plan. Still, for tokens carrying real user data or production scopes, decode locally instead of trusting any web page, however reputable.Read the answer →

A list of progressive web apps worth installingThere is no App Store for progressive web apps, which is why a list is the only way to find them. The ones worth installing cluster in a few places: drawing and design (Excalidraw, Photopea, Penpot), developer references (DevDocs, regex101, Squoosh), notes and documents (Notesnook, AppFlowy, CryptPad), games (Lichess, PROXX, 2048), and maps (Organic Maps, OpenStreetMap). Install from the browser's address bar — there is nothing to download.Read the answer →

Websites that install like appsA progressive web app is a website that can install itself: it declares a manifest, registers a service worker, and the browser then offers it a home-screen icon and its own window with no address bar. Unlike a bookmark, an installed site can cache its own code and keep running with no connection. Excalidraw, Photopea, DevDocs, Lichess and Organic Maps are all ordinary websites by URL and installed applications once you accept the prompt.Read the answer →

Free apps that install from the browserProgressive web apps skip the app stores entirely, so there is no 30% platform cut pushing developers toward paid tiers — and a lot of the best ones are free. Lichess, DevDocs, Excalidraw, PROXX, Squoosh, GeoGebra and Organic Maps are all free to use, and several are open source. Install from the browser: no store account, no payment method on file, nothing to download.Read the answer →

Developer tools that install from the browserThe strongest case for installable web apps is developer tooling, because the job is usually a lookup and a lookup should not need a round trip. DevDocs caches every major API reference for offline use. regex101 explains what a pattern matches, crontab.guru does the same for cron, jwt.io decodes tokens locally, and Squoosh compresses images without uploading them. All install from the address bar.Read the answer →

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MarkSimple Test and Exmaples

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Serwist

A set of JavaScript libraries described as a Swiss Army knife for service workers, with this site hosting its documentation. Serwist helps web developers add precaching, runtime caching, and offline behavior to their sites, continuing the approach popularized by Google's Workbox.

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A React based progressive web app that uses Open Weather Map API to fetch the weather data and display it in a beautiful card. This web app is also available offline. Obviously it can't fetch new weather data but it can display a warning message to suggest user to connect to the

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