5 open-source apps that run entirely in your browser and …

These browser-based apps give you complete control over your data!

Sometimes you just need an app that doesn't ask you to install anything, create an account, or send data to a server somewhere. There's no need for all of this if you just want to write a quick note, make a single-use to-do list, or create a simple diagram that you don't intend to leave your computer. A web app that stores everything locally can do the trick, and luckily, there are several options that can cover a wide range of scenarios.

The best way to find local-first, frictionless apps like these is to turn to the open-source community. They're known for releasing tools that respect your privacy and are completely free. But it's not just about saving money and peace of mind — it's also about convenience and efficiency. Let's look at some options. TiddlyWiki is an alternative to Notion and Obsidian that asks you to rethink the way you flesh out your ideas.

It emphasizes breaking them down into self-contained chunks called Tiddlers — each one can be a note, to-do list, code snippet, recipe, or journal entry. You can then link Tiddlers together or embed them into others to create a notebook that allows you to expand and evolve ideas in a non-linear fashion. Using TiddlyWiki requires you to download a file called empty.html. This self-contained HTML file houses the entire web app, including its logic and all your content.

It runs entirely in your browser without needing a server. Any modern browser can open it, allowing you to create Tiddlers using the built-in and easy-to-learn markup language called WikiText. Furthermore, since the entire app is a single HTML file, it's extremely portable. You can even carry it around on a flash drive and work on your ideas anywhere you have access to a computer. TiddlyWiki is a highly customizable tool for creating a personal knowledge base that functions as a self-contained, single-file wiki, allowing users to capture, organize, and link ideas in unique ways.

While Lucidchart is considered the gold standard for diagramming, Lucidchart has several open-source alternatives that can be better. One of them is a web app called Mermaid that lets you code your diagrams with speed and precision. But if you want something more visual that stores your drawing locally, you have Excalidraw. Excalidraw is a whiteboarding tool with a minimalistic interface that doesn't overwhelm you with tools and panels.

At the same time, it has a massive canvas that lets you diagram to your heart's content. The resulting diagrams have a hand-drawn aesthetic that looks surprisingly good. It's things like this, plus the fact that it's completely free, that make it an accessible and inviting diagramming tool. Also, Excalidraw works well in mobile browsers like Chrome for iPhone and Android. The interface is mobile-responsive and saves diagrams locally, so you can work on the go without downloading an app.

Excalidraw is a browser-based, open-source whiteboard for sketching diagrams, wireframes, and ideas collaboratively, featuring hand-drawn visuals, real-time collaboration, export options, and offline support with end-to-end encryption and simple sharing links. I normally use ShareX to edit images on my Windows computer. But when I'm away or don't have my travel-ready productivity toolkit, miniPaint is my go-to image editor.

I normally don't like using online image editors because they usually come with upload limits or ads, but this one is free of those annoyances. I mostly use it to crop and annotate the images I use for my work when I'm not on my main computer. miniPaint has many tools that are present in popular image editors. You can use it to create, edit, layer, and manipulate images using brushes, effects, filters, color adjustments, selection tools, and more.

The interface is also surprisingly intuitive, giving a generous canvas while keeping the tools and panels to a minimum. It might lack the fancy AI features of Photoshop (e.g., background removal and generative fill) or the automation capabilities of ShareX, but it's fast, functional, and completely free — perfect for some light image editing. I've talked about Kdenlive as a great open-source alternative to CapCut before.

However, I was surprised to discover a browser-based option that's even easier to use — OpenReel Video. With no cloud processing or paywalled features, this fully featured video editor is great for anyone looking for a frictionless way to create a quick TikTok video or a more serious video with special effects. The interface will be familiar to anyone who has used CapCut before. It offers impressive core features such as effects, transitions, multi-track video editing and audio mixing, keyframe animation, color grading, revision history, and unlimited 4K-resolution exports.

It even includes screen recording, allowing you to choose which part of the screen you want to capture (e.g., a browser tab, window, entire screen, or webcam), along with audio recording. Furthermore, it includes features that CapCut limits or puts behind paywalls — and it offers them for free. This includes AI background removal, captions, text-to-speech, and translation (over 90 languages). It's unbelievable that it's being given away for free.

OpenReel Video is a fully open‑source, browser-based professional video editor that offers AI‑powered tools, multi‑track editing, and complete local processing with no installs or uploads required. Super Productivity is a well-known productivity app for doing deep work. It has several tools that allow you to immerse yourself in whatever demanding task you have in front of you, putting you in a flow state where time disappears and tasks become effortless.

That state is considered to maximize output, and Super Productivity aims to make achieving it simple without asking you to pay a single cent. Standalone timers never clicked for me, but a task app with a built-in Pomodoro feature did. Super Productivity is a task manager, note-taker, and time tracker combined into one. It also has a focus mode that uses the Pomodoro method and time-boxing to help sustain your focus for longer periods of time.

It's got desktop and mobile apps, but you don't need to download any of them because you can also use it straight from your browser without needing to create an account. You can even install it as a progressive web app (PWA), allowing you to use it offline. Cross-device syncing is optional via WebDAV and Dropbox. It's a great alternative to Todoist, Notion, Trello, and Clockify — all rolled into one.

Super Productivity is an open‑source task manager that combines to‑dos, time tracking, and deep‑work tools into a privacy‑focused productivity app. The best part of using browser-based tools is that they're highly convenient and work across various platforms (mostly on desktop in this case). Being open-source is just the icing on the cake that helps you avoid vendor lock-in — no subscription fees and no storing your data on someone else's servers.

You can trust the open-source community to have a tool that meets your specific needs for various scenarios, whether it's a native, web, or self-hosted app.

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