Utilities Progressive Web Apps

Clock Master is a modern, privacy-first Progressive Web App engineered for high-precision timekeeping. Features background-reliable Web Audio alarms, a full-screen digital clock, Pomodoro timer with ambient soundscapes, meeting planner, and solar tracker—100% offline ready with zero tracking.

Hosted NTRIP caster for RTK base stations. Stream centimeter corrections from your GNSS base to rovers and crews, forward to networks like Onocoy, download RINEX for post-processing, and watch live health — satellites, uptime, position checks. Free for one base station.

Share files up to 10GB with end-to-end encryption. Files are never stored permanently — they vanish after download or 24 hours. No account, no tracking. Faster than WeTransfer.

Open-source password manager — the best LastPass alternative. End-to-end encrypted vault, browser extension, cross-device sync. Free for personal use, self-hostable. Vaults stay readable offline once the app is installed, so a lost connection never locks you out of your own passwords.

Check if a food product is vegan by scanning its barcode or searching by ingredient. Open-source, offline-capable. Built for people who want to verify product contents quickly.

Convert between 500+ file formats in your browser. Documents, images, audio, video, ebooks — fast client-side conversion that doesn't upload your files to a server. Conversion runs client-side, so a confidential document is never uploaded anywhere to change format.

Scan QR codes and barcodes using your device camera. Works offline, no app download needed. Faster than downloading a native app — just open in browser and scan.

Create QR codes for URLs, text, Wi-Fi, contacts, and more. Customize colors and download as SVG or PNG. No account, fully client-side, instant generation. Codes are drawn in the browser, so a Wi-Fi password or contact card never reaches a third-party server.

Bulk image editing in your browser — resize, crop, convert, compress hundreds of images at once. All processing is local, no server uploads. A massive time-saver for content creators.

Copy and paste your text into the online editor to count its words and characters, check keyword density, and correct writing mistakes. Bookmark it now, it’s free and easy.

Set alarms that wake you with a YouTube video or MP3 file of your choice. A unique browser-based alarm clock — no app download, works as a PWA. Never wake up to a default beep again.

Create an anonymous, shareable note with a unique URL. No account, no tracking — great for sharing temporary text or passwords. Notes can be set to self-destruct.

Instant offline notepad that auto-saves to your browser. Open a tab, start typing, it's there when you come back. The fastest possible way to jot something down.

Translate text to Morse code with audio playback and visual flash. Works offline, no account needed. Listen, copy the dots-and-dashes, or tap to decode. Playback speed follows standard words-per-minute rates, so it doubles as practice material rather than a novelty. Output can be copied as text or heard as audio.

Scientific, financial, date, and unit calculators in one place. Installable, works offline. Far more powerful than your phone's built-in calculator. Each calculator keeps its own history, so a mortgage figure is still there after switching to the unit converter and back.

Convert data between formats: JSON, CSV, Excel, Markdown tables, SQL INSERT statements, HTML tables. Paste data and get the output instantly. Essential for data wrangling.

200+ free online tools — PDF tools, image converters, video compressors, AI writers, and more. All in one place, no sign-up required for most tools.

Free, open-source diagramming tool. Flowcharts, network diagrams, UML, floor plans. Works offline, saves to Google Drive/GitHub/local. Widely used in enterprises as a Visio alternative. Files stay in the .drawio XML format, so a diagram remains editable years later without the tool that made it.

Infinite canvas whiteboard for quick sketches and diagrams. Minimal, fast, collaborative. Open-source alternative to Miro with a focus on simplicity and developer extensibility. The canvas has no fixed page size, so a sketch can grow in any direction without being rescaled to fit.

Open-source, end-to-end encrypted password manager and digital wallet. Self-hostable, audited codebase, beautiful UI. A worthy Bitwarden alternative for privacy-focused teams. The vault is encrypted before it leaves the device, so a self-hosted server stores data it cannot read.

Open-source, self-hostable pastebin where the server has zero knowledge of the pasted data. End-to-end encrypted, ephemeral pastes. The privacy-first alternative to Pastebin. The decryption key travels in the URL fragment, which the browser never sends to the server hosting the paste.

Create GIFs from videos, images, or your webcam directly in the browser. Crop, add text, adjust speed. The fastest way to create a shareable GIF without any software.

App store for Linux — browse and install thousands of apps via Flatpak. Installable as a PWA to search the catalog. A key part of the modern Linux desktop ecosystem.

AirDrop for the web — share files instantly with devices on the same Wi-Fi network. No accounts, no uploads, peer-to-peer WebRTC transfer. Files never touch a server.

SilveOS is a free, cross-platform web operating system that runs entirely in the browser. It provides a Windows-like desktop environment with a start menu, system settings, calculator, terminal, and rich text editor. Built as a progressive web app, it works on desktop and mobile without installation. Features include file management, theme and wallpaper customization, and support for running apps within the browser-based desktop interface.

A free Bengali (Bangla) calendar PWA offering daily tithi, nakshatra, and panchang calculated using the traditional Bishuddha Siddhanta method — the same reference published Bengali panjikas use. Includes auspicious muhurta timings, daily rashifal, 15-day weather forecasts, and a growing collection

A simple, tiny, and fast web app for scanning QR codes in the browser, using your camera or an uploaded image, with no app to install. Decoding happens locally so nothing is uploaded, it works offline, and it runs on iPhone, Android, and desktop.

Link Cleaner strips tracking codes, search parameters, and other junk from URLs in one click. Once installed, it appears in your device's share menu so links can be cleaned directly from other apps. Useful for anyone who shares links and wants them short and free of trackers.

Gamma MCA is a free progressive web app for gamma-ray spectroscopy. Users can import and export spectrum files or record new spectra live from detector hardware over the serial interface, with live plotting. It suits hobbyists, students, and researchers analyzing radiation spectra in the browser.

A browser tool that reads out all ExtendedSave plugin data embedded inside a PNG file. Useful for anyone handling PNG images that carry hidden plugin payloads, such as modded game character cards, letting them inspect exactly what data a file contains before using it.

A web app for checking daily fuel prices across most states in India. Drivers and vehicle owners can look up current rates before filling the tank, since fuel prices there change regularly and differ by state. A focused, single-purpose price checker rather than a full motoring app.

A small Progressive Web App that displays your device's battery status in the browser. It reads battery information from the web platform and gives users a quick view of their charge state, and it also serves as a lightweight example of what web apps can access.

A reference dictionary of Tesla vehicle alert codes and their meanings. Drivers can look up the codes shown on their car's screen to understand what each warning indicates. Useful for Tesla owners who want to interpret alerts without digging through official manuals or forums.

A minimalist weather app that displays local conditions using data powered by Visual Crossing. Aimed at people who want a clean, simple way to check the weather for their location in the browser, without the clutter and ads of typical weather portals.

A speedometer built as a Progressive Web App that uses your device to measure and display your current speed. Open it on a phone while driving, cycling, or running to see how fast you are moving, without needing to install a native speedometer app.

The web interface for HomeGenie, an open-source home automation server, built with the zUIx.js component library and packaged as a progressive web app. Homeowners and hobbyists can use it to view and control HomeGenie-managed devices from a browser, while developers can study it as a zUIx.js starter example.

An open-source clock app for the browser that bundles a timer, stopwatch, and alarms, with customization options so you can make the app your own. It mirrors the core features of a phone's built-in clock in web form. Useful for anyone who wants timing tools in a browser, and open for developers to inspect.

MobilEASE, short for Mobile Efficient Assistance for Traffic, is an application for reporting traffic issues around you. Drivers, commuters, and local residents can flag road problems in their area from a mobile-friendly web interface. It presents itself as a focused reporting tool for traffic conditions rather than a full navigation app.

A single web page that uses local JavaScript to calculate time-based one-time password (TOTP) codes for two-factor authentication, and works offline. It acts as a browser-based alternative to authenticator apps like Google Authenticator for users who want to generate 2FA codes without a phone app or sending secrets to any server.

BigRed.link is a self-described big red URL shortener that converts long web addresses into short links that are easier to share. Comparable in purpose to services like Bitly or TinyURL, it suits anyone who needs compact links for messages, documents, or social posts. No additional features such as analytics are described in the available information.

SRTM2TAK downloads Shuttle Radar Topography Mission (SRTM) elevation data and packages it for use in ATAK, the Android Team Awareness Kit. Intended for ATAK users who need terrain elevation layers on their maps, it handles fetching the relevant elevation tiles and preparing them in a format the app can import.

A serverless PDF tool that lets you merge, sort, delete, and split PDF files directly in your local browser, inspired by the macOS Preview app. Because processing happens client-side rather than on a server, files stay on your machine, which suits anyone handling documents they would rather not upload.

A peer-to-peer file-sharing web app that transfers files directly between devices without routing them through an intermediary server. Aimed at anyone who wants a quick, private way to send files to peers, similar in spirit to Snapdrop.

A utility that keeps your device's screen awake so it does not lock or sleep while in use. It also offers draggable widgets for managing tasks, with settings saved between sessions, and installs to the home screen as a progressive web app for quick access.

A simple weather Progressive Web App built with React that fetches current conditions from the OpenWeatherMap API. Designed as a basic example project, it suits developers learning how to combine React with PWA techniques, as well as anyone wanting quick weather lookups in the browser.

A basic calculator web app built with React for a freeCodeCamp project, handling the four core operations: addition, subtraction, multiplication, and division. It is a straightforward tool for quick everyday arithmetic and a reference example for developers completing the same certification exercise.

A simple calculator app by developer Notse that runs directly in the browser. It covers standard everyday arithmetic without requiring installation of native software, making it a lightweight option for students, office workers, or anyone needing quick calculations on desktop or mobile devices.

A free, ad-free, open-source, general-purpose math calculator that runs in the web browser. Hasap focuses on user-friendliness for real-life calculations, making it suitable for everyday users who want an approachable web alternative to their device's built-in calculator app.

A weather Progressive Web App developed in React with custom service workers, published in the PWA store. It shows weather information in a modern interface and demonstrates installable, service-worker-backed web app techniques, suiting both everyday users checking conditions and developers studying React PWA construction.

A single-purpose counter application for tallying anything you need to count, such as repetitions, attendees, or inventory items. Built as a Progressive Web App, it deliberately does nothing beyond incrementing and tracking counts, making it useful for anyone wanting a no-frills tally counter.

A directory for discovering Progressive Web Apps, collecting installable web applications in one place, similar in concept to a traditional app store. Intended for users who want to find new PWAs to use and for developers looking to have their web apps listed.

A mobile-first Progressive Web App built to help shooters zero a rifle, with the author planning further shooting-related tools over time. Designed for quick use at the range on a phone, it suits target shooters and hunters who want a simple sight-in companion.

A single-purpose utility that generates secure, hard-to-guess passwords at the click of a button. Users who need a fresh random password for a new account can produce one instantly in the browser. A lighter-weight companion to full password managers such as Bitwarden or 1Password.

A password-saving web app built as a practice project with the Vue.js framework, using Vuex for state management and the Onsen.io component library for its interface. It lets users keep stored passwords in one place and is aimed as much at developers exploring Vue tooling as at end users.

A simple weather web app built with React that shows conditions using the Yahoo Weather API. Installable like a native app, it targets users who want a quick, no-frills forecast check from the browser or home screen without downloading a full weather application.

A collection of utilities for CNC machining, presented in Russian. It offers coordinate conversions, cutting-parameter and angle calculations, contour-element computations that account for the cutting tool, and templates for machine control programs. Aimed at machinists and CNC programmers who need quick shop-floor calculations without opening desktop CAM software.

A straightforward weather application built as a Progressive Web App, letting users check conditions from any modern browser and install it to their device like a native app. Suited to anyone wanting a lightweight, browser-based alternative to the weather apps bundled with phones.

A web app for storing and managing personal files in the cloud, in the vein of Google Drive or Dropbox. Users can upload files and organize them from the browser. Built with the Ionic framework, giving it a mobile-style interface that works across devices.

A mobile-oriented weather app built with React using progressive web app technologies, so it can be added to a phone's home screen and opened like a native app. It offers a simple way to check the weather from the browser, and doubles as a demonstration of React-based PWA development.

A small color picker utility packaged as a Progressive Web App. Its own description labels it a test app, and its page title, 'Dastur UZ', suggests an Uzbek developer's project. Best treated as a simple demo for picking colors in the browser rather than a full product.

A text utility for counting words and characters, converting between uppercase and lowercase, removing extra spaces, copying results to the clipboard, and estimating reading time. Useful for writers, students, and editors who need quick text statistics in the browser.

A utility for validating and generating Hong Kong Identity Card (HKID) numbers. Built with Flutter as a single-page web application, it helps developers and testers produce valid-format HKID numbers for test data and lets anyone check whether a given number is valid.

A lightweight Firebase Progressive Web App built to notify forgetful coworkers when the office fridge is running low on milk. Designed for workplaces and shared kitchens, it sends notifications so the team restocks before the next coffee break instead of finding an empty carton.

Local-first, offline Progressive Web App for tracking laundry: catalog your garments, log each drop-off at the cleaners, and keep proof of every pickup. All data stays on your device with no accounts or cloud service, suiting privacy-conscious users who regularly use laundry services.

A calculator web application created with React.js and published within developer Alex Disdier's portfolio site. It performs arithmetic directly in the browser and showcases his JavaScript, TypeScript, and React work, making it useful both as a quick everyday calculator and as a code demonstration.

Local-first inventory tracker for makers and hobbyists, covering electronics components, 3D-printing supplies, tools, and general stock. Because data is stored locally rather than in the cloud, it suits workshop owners who want to know exactly what parts they have without depending on an online service.

Lightweight viewer and analyzer for CSV files that runs in the browser. Useful for developers, analysts, and anyone who needs to quickly inspect spreadsheet-style data without launching Excel or Google Sheets, it focuses on fast viewing and basic analysis of comma-separated files.

A simple calculator built as a progressive web app using plain HTML, CSS, and JavaScript, with a German-language interface. It handles everyday arithmetic in the browser and can be installed like a native app. A lightweight choice for anyone wanting a no-frills calculator.

A Bluetooth transfer hub for the browser, in Portuguese, that works fully offline. It centers on transfers between devices over Bluetooth and adds a public terminal, connection logs, and a large UUID reference for working with Bluetooth services. Useful for tinkerers exploring Bluetooth on the web.

A calculator progressive web app that recreates the look and feel of the iOS calculator, usable on the web, Android, and iOS. Install it on any platform for a familiar Apple-style calculator experience. Handy for Android or desktop users who prefer the iPhone calculator layout.

An app built to support asylum seekers in Malaga, Spain, integrated with the EasyRights project. It offers a digital point of support for people navigating the asylum process, and is aimed at refugees, migrants, and the organisations that assist them during arrival and settlement in the region.

A home screen for a farm of micro-apps: microspec gathers small installable web applications in one store-style launcher. According to its description, the micro-apps are installable, work offline, and include gates. It suits users who want lightweight, single-purpose tools collected in one Ukrainian-language hub.

A secure password generator that brings the pwgen command-line tool's approach to the browser. It creates random passwords and is offline-capable, so credentials can be generated without sending anything over a network. Suited to developers and privacy-conscious users who want pwgen-style passwords on any device.

zilink.co is a link management platform that shortens URLs, generates QR codes, and tracks every click and interaction. It is aimed at marketers, creators, and businesses that want to connect audiences with the right content while measuring engagement, making it an alternative to Bitly.

A QR code generator that works without an internet connection. It creates QR codes for URLs, contact details, WiFi credentials, and more, directly in the browser. Its offline-first design makes it useful at events or while traveling, when connectivity is slow or unavailable.

klo.lt is a small web app associated with the handle @CuttleCity. Its listing offers no further description of its purpose or feature set, so it is best understood as a minimal personal project that visitors should open directly to see what it currently does.

A calculator built as a progressive web app for working out how much material, such as sand, is loaded in a lorry or truck. Enter the load's measurements and it computes the quantity, which is useful for construction crews, hauliers, and buyers checking deliveries on site.

An offline-capable OCR tool that converts images into editable text directly in the browser. Load a picture or screenshot and it extracts the text it contains, with no native software required — handy for digitizing documents, notes, or captions even without an internet connection.

A personal Spanish-language app a developer built for himself and his partner, bundling calculators, rate tools still marked as in progress, a counter for time spent together, and a dark mode. It installs like a native app and keeps working offline.

A React-based utility for encrypting and decrypting files in the browser using the AES algorithm. It is intended for anyone who wants to protect a file's contents before storing or sharing it, without installing dedicated desktop encryption software.

The web's default translator covering 240+ languages — type, speak or upload documents and whole websites. translate.google.com ships a standalone PWA manifest, so the install icon in Chrome's address bar turns it into a dedicated translation window; note that offline language packs remain a mobile-app exclusive.

Open-source file conversion with the processing done on your device — images, audio and documents convert locally via WebAssembly with no size limits, no ads and no tracking; only heavy video jobs use a server. Ships a standalone PWA manifest with a full icon set, installing as a genuinely private converter app.

A privacy-first PDF toolkit where every operation — merge, split, compress, rotate, sign, watermark, convert — runs entirely client-side with zero uploads and zero tracking. The standalone web manifest makes it installable from the browser, turning BentoPDF into a local PDF app that never phones home with your documents.

Explore the full Bitcoin ecosystem with The Mempool Open Source Project®. See the real-time status of your transactions, get network info, and more. Installs to your home screen from any modern browser — no app store, no download, its manifest declares standalone display with a 512px icon, and it caches nothing for offline use, so it needs a connection. Checked by hand on 8 August 2026.

watch ETH become ultra sound money. Installs to your home screen from any modern browser — no app store, no download, its manifest declares standalone display with a 216px icon, and it caches nothing for offline use, so it needs a connection. Checked by hand on 8 August 2026.

Decentralised naming for wallets, websites, & more. Installs to your home screen from any modern browser — no app store, no download, its manifest declares standalone display with a 512px icon, and it caches nothing for offline use, so it needs a connection. Checked by hand on 8 August 2026.