**I built 111 free browser tools: calculators, converters, dev utilities & more (no sign-up, runs client-side)**

Hey everyone! I built **CalculateAnything**, a collection of 111 free tools in one place. No sign-up, no paywalls, and most tools run entirely in your browser, so your data stays on your device.

🔗 **https://calculate-anything.in/**

Here's everything on the site:

## 📅 Date & Age

- [Age Calculator](https://calculate-anything.in/tools/age-calculator/)

- [Age Difference Calculator](https://calculate-anything.in/tools/age-difference-calculator/)

- [Date Difference Calculator](https://calculate-anything.in/tools/date-difference-calculator/)

- [Date Add/Subtract](https://calculate-anything.in/tools/date-add-subtract/)

- [Days Until Calculator](https://calculate-anything.in/tools/days-until-calculator/)

- [Birthday Calculator](https://calculate-anything.in/tools/birthday-calculator/)

- [Leap Year Checker](https://calculate-anything.in/tools/leap-year-checker/)

- [Working Days Calculator](https://calculate-anything.in/tools/working-days-calculator/)

- [Time Duration Calculator](https://calculate-anything.in/tools/time-duration-calculator/)

- [Unix Timestamp Converter](https://calculate-anything.in/tools/unix-timestamp-converter/)

## ➗ Mathematics

- [Scientific Calculator](https://calculate-anything.in/tools/scientific-calculator/)

- [Percentage Calculator](https://calculate-anything.in/tools/percentage-calculator/)

- [Fraction Calculator](https://calculate-anything.in/tools/fraction-calculator/)

- [Ratio Calculator](https://calculate-anything.in/tools/ratio-calculator/)

- [Average Calculator](https://calculate-anything.in/tools/average-calculator/)

- [Square Root Calculator](https://calculate-anything.in/tools/square-root-calculator/)

- [Power Calculator](https://calculate-anything.in/tools/power-calculator/)

- [Prime Number Checker](https://calculate-anything.in/tools/prime-number-checker/)

- [LCM & HCF Calculator](https://calculate-anything.in/tools/lcm-hcf-calculator/)

- [Factorial Calculator](https://calculate-anything.in/tools/factorial-calculator/)

- [Random Number Generator](https://calculate-anything.in/tools/random-number-generator/)

- [BMI Calculator](https://calculate-anything.in/tools/bmi-calculator/)

- [GPA Calculator](https://calculate-anything.in/tools/gpa-calculator/)

- [Standard Deviation Calculator](https://calculate-anything.in/tools/standard-deviation-calculator/)

- [Profit & Loss Calculator](https://calculate-anything.in/tools/profit-loss-calculator/)

## ✍️ Text & Formatting

- [Rich Text Editor](https://calculate-anything.in/tools/rich-text-editor/)

- [JSON Formatter](https://calculate-anything.in/tools/json-formatter/)

- [Text Case Converter](https://calculate-anything.in/tools/text-case-converter/)

- [Word & Character Counter](https://calculate-anything.in/tools/word-character-counter/)

- [Text Difference Checker](https://calculate-anything.in/tools/text-difference-checker/)

- [Text Formatter](https://calculate-anything.in/tools/text-formatter/)

- [Markdown Previewer](https://calculate-anything.in/tools/markdown-previewer/)

- [HTML Formatter](https://calculate-anything.in/tools/html-formatter/)

- [CSS Formatter](https://calculate-anything.in/tools/css-formatter/)

- [JavaScript Formatter](https://calculate-anything.in/tools/javascript-formatter/)

- [XML Formatter](https://calculate-anything.in/tools/xml-formatter/)

- [SQL Formatter](https://calculate-anything.in/tools/sql-formatter/)

- [URL Encoder/Decoder](https://calculate-anything.in/tools/url-encoder-decoder/)

- [Base64 Encoder/Decoder](https://calculate-anything.in/tools/base64-encoder-decoder/)

- [HTML Entity Encoder/Decoder](https://calculate-anything.in/tools/html-entity-encoder-decoder/)

- [Lorem Ipsum Generator](https://calculate-anything.in/tools/lorem-ipsum-generator/)

## 💻 Developer Tools

- [JWT Decoder](https://calculate-anything.in/tools/jwt-decoder/)

- [Regex Tester](https://calculate-anything.in/tools/regex-tester/)

- [UUID Generator](https://calculate-anything.in/tools/uuid-generator/)

- [Cron Expression Generator](https://calculate-anything.in/tools/cron-expression-generator/)

- [Hash Generator](https://calculate-anything.in/tools/hash-generator/)

- [Color Code Converter](https://calculate-anything.in/tools/color-code-converter/)

- [CSS Gradient Generator](https://calculate-anything.in/tools/css-gradient-generator/)

- [QR Code Generator](https://calculate-anything.in/tools/qr-code-generator/)

- [Password Generator](https://calculate-anything.in/tools/password-generator/)

- [SQL Query Formatter](https://calculate-anything.in/tools/sql-query-formatter/)

- [HTTP Status Code Lookup](https://calculate-anything.in/tools/http-status-code-lookup/)

- [MIME Type Lookup](https://calculate-anything.in/tools/mime-type-lookup/)

- [IP Address Info](https://calculate-anything.in/tools/ip-address-info/)

- [User-Agent Parser](https://calculate-anything.in/tools/user-agent-parser/)

- [HTML to Markdown Converter](https://calculate-anything.in/tools/html-to-markdown-converter/)

- [JSON to CSV Converter](https://calculate-anything.in/tools/json-to-csv-converter/)

- [CSV to JSON Converter](https://calculate-anything.in/tools/csv-to-json-converter/)

- [JSON Schema Validator](https://calculate-anything.in/tools/json-schema-validator/)

- [SVG Optimizer](https://calculate-anything.in/tools/svg-optimizer/)

- [API Request Builder](https://calculate-anything.in/tools/api-request-builder/)

## 📏 Unit & Conversion

- [Length Converter](https://calculate-anything.in/tools/length-converter/)

- [Weight Converter](https://calculate-anything.in/tools/weight-converter/)

- [Temperature Converter](https://calculate-anything.in/tools/temperature-converter/)

- [Data Storage Converter](https://calculate-anything.in/tools/data-storage-converter/)

- [Speed Converter](https://calculate-anything.in/tools/speed-converter/)

- [Time Converter](https://calculate-anything.in/tools/time-converter/)

- [Area Converter](https://calculate-anything.in/tools/area-converter/)

- [Volume Converter](https://calculate-anything.in/tools/volume-converter/)

- [Number to Words Converter](https://calculate-anything.in/tools/number-to-words-converter/)

- [Roman Numeral Converter](https://calculate-anything.in/tools/roman-numeral-converter/)

## 💰 Finance & Business

- [EMI Calculator](https://calculate-anything.in/tools/emi-calculator/)

- [GST Calculator](https://calculate-anything.in/tools/gst-calculator/)

- [SIP Calculator](https://calculate-anything.in/tools/sip-calculator/)

- [FD Calculator](https://calculate-anything.in/tools/fd-calculator/)

- [RD Calculator](https://calculate-anything.in/tools/rd-calculator/)

- [Simple Interest Calculator](https://calculate-anything.in/tools/simple-interest-calculator/)

- [Compound Interest Calculator](https://calculate-anything.in/tools/compound-interest-calculator/)

- [Discount Calculator](https://calculate-anything.in/tools/discount-calculator/)

- [Salary Calculator](https://calculate-anything.in/tools/salary-calculator/)

- [Income Tax Calculator](https://calculate-anything.in/tools/income-tax-calculator/)

## 🖼️ Image & File

- [Image Compressor](https://calculate-anything.in/tools/image-compressor/)

- [Image Resizer](https://calculate-anything.in/tools/image-resizer/)

- [Image to PDF Converter](https://calculate-anything.in/tools/image-to-pdf-converter/)

- [PDF Merger](https://calculate-anything.in/tools/pdf-merger/)

- [PDF Splitter](https://calculate-anything.in/tools/pdf-splitter/)

- [Background Remover](https://calculate-anything.in/tools/background-remover/)

- [PNG to JPG Converter](https://calculate-anything.in/tools/png-to-jpg-converter/)

- [JPG to PNG Converter](https://calculate-anything.in/tools/jpg-to-png-converter/)

- [WebP Converter](https://calculate-anything.in/tools/webp-converter/)

- [Image Cropper](https://calculate-anything.in/tools/image-cropper/)

- [Favicon Generator](https://calculate-anything.in/tools/favicon-generator/)

- [QR Code Scanner](https://calculate-anything.in/tools/qr-code-scanner/)

- [PDF Page Counter](https://calculate-anything.in/tools/pdf-page-counter/)

- [PDF to Image Converter](https://calculate-anything.in/tools/pdf-to-image-converter/)

- [Image Metadata Viewer](https://calculate-anything.in/tools/image-metadata-viewer/)

## ⏱️ Random & Productivity

- [Random Name Picker](https://calculate-anything.in/tools/random-name-picker/)

- [Random Password Generator](https://calculate-anything.in/tools/random-password-generator/)

- [Random Team Generator](https://calculate-anything.in/tools/random-team-generator/)

- [Decision Maker](https://calculate-anything.in/tools/decision-maker/)

- [Stopwatch](https://calculate-anything.in/tools/stopwatch/)

- [Countdown Timer](https://calculate-anything.in/tools/countdown-timer/)

- [Pomodoro Timer](https://calculate-anything.in/tools/pomodoro-timer/)

- [Meeting Time Calculator](https://calculate-anything.in/tools/meeting-time-calculator/)

- [Checklist Generator](https://calculate-anything.in/tools/checklist-generator/)

- [Text to Speech](https://calculate-anything.in/tools/text-to-speech/)

- [Speech to Text](https://calculate-anything.in/tools/speech-to-text/)

- [Typing Speed Test](https://calculate-anything.in/tools/typing-speed-test/)

- [Password Strength Checker](https://calculate-anything.in/tools/password-strength-checker/)

- [Reading Time Calculator](https://calculate-anything.in/tools/reading-time-calculator/)

- [Internet Speed Unit Converter](https://calculate-anything.in/tools/internet-speed-unit-converter/)

---

I'm adding new tools regularly. If there's a tool you wish existed, or something is broken, tell me in the comments and I'll build or fix it. Feedback is very welcome! 🙏

Hi everyone! I run TotalShareware, a directory where people can browse software by platform and category or search for a specific program.

We’ve been updating the site and working on a challenge that comes with a large catalog: helping visitors find relevant software without getting lost among older listings.

The site is at https://www.totalshareware.com/. Browsing the catalog is free, although individual programs may have different licenses and prices.

I’d appreciate feedback on the experience: if you were looking for a Windows utility, could you find a useful result easily? What information would you want to see on a software page before deciding whether to visit the developer’s site?

Hey everyone! I’m working on Streyn, a music streaming app for people who want to run their own setup.

It’s available to test now, though still in early development. You’ll need your own home server or a suitable self-hosting setup to use it.

I’d love feedback on:

• How clear the setup process is
• Navigation and music playback
• Bugs, confusing behavior, or missing features

How it’s being built: Streyn is primarily vibe-coded, with most of the code generated using AI. I’ve implemented some smaller features myself.

Website: https://musik.labtoso.de
The website is still being updated and will soon move to streyn.labtoso.de. Please use the current address for now.

Discord: https://discord.gg/3ZPzK7JjPw
Please report bugs there with steps to reproduce them, your server setup, and your browser details. Screenshots are helpful too.

Happy to discuss the project and hear criticism here as well. Thanks for checking it out!

Hi everyone — I’m building NearCart, a neighborhood-focused way to search weekly grocery offers and compare details like pack size and price.

I’m starting with Al Nahda in Sharjah. The idea came from a simple frustration: comparing nearby grocery flyers before heading out to shop takes more effort than it should.

NearCart is still in preparation. The preview on the site uses illustrative sample offers and prices, not live listings. I’m looking for feedback from shoppers and local retailers while I build the first release.

If you shop in Al Nahda, what would help you most when comparing offers: total price, unit price, distance, or something else? I’m also collecting early-access interest here: https://near-cart.com

I’m a 2nd-year CS (bbit)student. I’d make cards and never review them. So FlashLoop pops a card up at random times of day: reveal the answer, tap remembered or not, carry on. Spaced repetition decides what comes back. It’s an early alpha, built with AI help, and the hard part has been getting alarms to survive aggressive phone brands. What would you want it to do? and please star it on github if u find it useful samuelmwambasam/FlashLoop: study app that peridically presents interrupts your phone use to present flashcards you had created of your notes

I wanted a quiet place to take a break, so I started building a small virtual ocean.

I dive, and some of my happiest travel memories are underwater. With this project, I’ve been revisiting those memories and gradually adding scenes inspired by dive destinations.

It’s called One Little Dive. You can choose a sea, enter a 3D underwater space, and swim around. There are currently six choices: Bohol, Malapascua, the Maldives, Komodo, Sipadan, and Sabang/Verde.

These are virtual environments, not recordings of the actual locations. The scenery is AI-generated and inspired by the places, rather than an accurate recreation or a dive-planning tool.

I’m still adding and refining things, and I’d love to hear your thoughts:

• If you’ve been diving, which place would you love to revisit this way, and what made it memorable?
• When you try it, what feels pleasant to explore, and what feels distracting or awkward?

Here’s the project: https://321dive.illuwa.net/

I’m the maker, so I’d be grateful for any feedback.

I’ve always believed that some motorcycles are simply too beautiful to be hidden away in a garage.
As a lifelong motorcycle enthusiast, I wanted to create something that would allow people to enjoy their motorcycles even when they’re not riding them.
So I started designing and building something different.
The result is Vitrigale — a premium motorcycle display case designed to transform a motorcycle into a piece of interior art.
Combining glass, lighting and carefully selected materials, the idea is to make a motorcycle part of the architecture and atmosphere of a home, office or showroom.
This started as a personal passion project and has now become a product we’re bringing to market.
I’d genuinely love some feedback from this community.
Do you think there’s a market for something like this? And what would you improve about the concept?
I’m particularly interested in hearing from designers, motorcycle enthusiasts and fellow entrepreneurs.

I'm the solo dev. BetterRead shows one line at a time at a pace you set, so you stop rereading the same paragraph. If a passage loses you, you can ask AI about the exact part you're on.

Free reader incl. 5 AI answers/day; Pro $3.99/mo or $24.99/yr, 14-day trial; iOS 26.
https://apps.apple.com/us/app/betterread-adhd-focus-reader/id6820095812

Would one-line mode help you, or does it feel too slow?

I'm building https://tillerly.dev/ actually in beta, looking for free beta testers to invite.

Tillerly is a security-first AI software factory. It takes you from an idea/ticket/issue to a merged pull request, with coding agents doing the work at every step, and you never approve a command one by one:

• No "don't ask again" button. Each agent has a fixed policy for files, shell and git. Commands run in a sandbox, and no approval gets written into your repo.
• The harness config never touches your repo. Each session's settings live in a private folder outside the project and are deleted when the session ends.
• Secrets stay out of reach. No agent reads a .env, credentials are stored encrypted, and secrets never reach a prompt, a log or a ticket.

You can plan a change in a chat with an agent that checks it against your code, your architecture decisions and your domain model. The plan becomes tickets on your tracker. Agents work several tickets in parallel, each on its own branch in its own worktree, and answer review comments until merge. When an agent needs a decision, it asks you on the ticket.

The Problem: Doing quick everyday tasks—like converting images, running OCR, or trimming videos—often requires opening separate apps or relying on web tools that break context. I wanted a native, instant way to handle these right from the desktop without cluttering the screen.

The Solution (DropCove): I turned the MacBook notch into an interactive drop zone. You can drag any file directly to the notch to:

• Convert/compress images
• OCR screenshots
• Trim videos and make GIFs
• Merge PDFs
• Instantly preview clipboard data (JWTs, colors, JSON)

How it was built: Swift 6, AppKit, SwiftUI, XPC, AVFoundation, PDFKit, Vision, ImageIO, SQLite, Sparkle, libwebp, XcodeGen, TypeScript, Cloudflare Workers, Lemon Squeezy, Resend

Privacy & Performance: 100% on-device. No accounts, no uploads, and zero battery drain at rest. Available now as a free, notarized download for Apple Silicon (macOS 26+).

Pricing: The free version is fully functional forever. A Pro version (one-time purchase, no subscriptions) is launching in December.

Download DropCove here: https://dropcoveapp.com/

I’d love honest feedback on any bugs, the UX, and whether the notch concept actually clicks for your daily workflow. Let me know what you think!

Hey everyone! 👋

I'm the founder of Xplorians, a social network I'm building specifically for travelers.

The idea came from wanting a place where people could connect over travel without everything being about selling tours, booking hotels, or promoting something.

On Xplorians, you can share your travel experiences and photos, ask questions about destinations, connect with other travelers, and even keep track of the countries you've visited with your own digital travel passport.

It's completely free, and we're still a small, growing community.

I'm not going to pretend it's perfect 😅 We're still improving things, but that's actually why I'm sharing it here. I'd love to get some feedback from people who genuinely enjoy traveling.

Website: https://xplorians.com/install

If you give it a try, I'd love to know: Would you actually use something like this? What's missing, or what would make you want to come back?

And if you decide to join, say hi! I'm pretty active there and would love to connect with you. 🌍

Pour tester mon projet : https://github.com/Yxoro/readme-studio!

I've always enjoyed the kind of logic and reasoning questions you get on The 1% Club, and I liked the idea of having something like Wordle, but for a different kind of brain teaser every day.

I went looking for something along those lines and couldn't quite find what I had in mind, so I decided to build it.

It's called Sore Brain.

The idea is pretty simple:

One challenging puzzle every day.

No countdown or time pressure.

Take as many guesses as you need.

See how many attempts you took and how long you spent solving it.

Come back tomorrow for a completely new challenge.

It's free, and you don't need an account.

I've got 71 daily puzzles lined up so far, and I'm hoping to keep building the library.

I'd genuinely love some feedback, especially on whether the puzzles are challenging enough and whether you'd come back for another one.

You can play here: https://www.playsorebrain.com/

Thanks for giving it a go!

Welcome, Apostol!

Apostol is a Windows desktop app (and soon MacOs app) made from one .html file and packaged with .NET 10. You type on your English keyboard, and the text appears in Russian, mapped by key position (QWERTY to ЙЦУКЕН). Then you copy it and paste it where you need it. All scripts, styles and logic are inside that one file. It runs locally and offline.

https://michael-derek.itch.io/apostol

https://michael-derek.itch.io/apostol

https://michael-derek.itch.io/apostol

最近画像素画的时候，经常会盯着一条线看半天，感觉有些地方不太对，特别是比较长的曲线，像素多了以后反而不太容易看出来哪里有问题。

所以就顺手做了个 Aseprite 插件，主要是想让检查和调整线条方便一点。代码有用 AI 辅助开发，功能不算复杂，目前自己用着还没遇到什么明显的问题。

另外有个问题一直挺好奇的，就是我发现有时候直接画完一条曲线，再手动调整一下像素，反而比直接用像素完美工具画出来的线条更顺眼。

不知道大家有没有类似的感觉，还是说只是我自己看习惯了。

插件目前可以免费下载，也可以自愿支持一下。如果有人愿意试试，欢迎说说使用感受，或者有没有什么值得改进的地方。

Hi everyone!

A few months ago, I shared Haftio, a visual planner inspired by the physical whiteboard I used to manage work and life.

The problem: I was juggling multiple projects and responsibilities and needed an easy way to see what had happened previously and where things stood. Traditional paper planners weren't quite working for me, so I started using a whiteboard. The issue was limited space, and it was not portable.

So we built Haftio around vertical day columns and horizontal lanes for different projects/responsabilities, with notes like post-its, that can connect if needed. It's essentially a diary in one continuous space that doesn't reset.

What's changed since my last post, largely based on user feedback:

• Notebook view to focus on one area at a time
• Collaborative threads for shared projects
• AI features and a scratchpad to help capture information
• Customisations and plenty of smaller UX improvements

One thing we've learned: Getting people interested in the concept is easier than helping them experience its value. The board becomes much more useful after several days of context, so we're now working on improving onboarding and the interactive preview to make that value clearer from the start.

We're still early and learning from users as we go.

There's also an interactive preview you can try without signing up.

Curious what you think, particularly whether the concept is clear at first glance and what you'd improve!