Alternatives
Products that do what Sigma Notepad Calculator does
The notepad calculator iPhone never had.
- 1IM
Hi HN It also supports percentages, dates and variables. I've been working on this alone for a few years now, so would love to get some feedback.
2022 · numpad.io
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- 4FA
Hi all, just posting an update to my previous Show HN, where I announced a side-project I worked on which was a (web version) of a multi-user, notepad style calculator: https://news.ycombinator.com/item?id=31817997 After a couple of user requests (and having a good think about it) I decided to migrate the web UI to create a Mac and Windows desktop app. After using it a little bit, I feel this is a much better experience than the webapp, and reduces a lot of the friction if I wanted to run a few small calculations. You can find the download links below:…
2022 · figr.app
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Write notes and calculate without switching apps.
Apr 2026 · apps.apple.com
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Here's something different than your usual fare: A physical keypad that lets you directly type math! Ever tried typing mathematical equations in your code IDE, email, or on Slack? You might know it can be tricky. Mathpad solves this with dedicated keys for Greek letters, calculus symbols, and more. Press the ∫ key and get ∫, in any application that accepts text. It uses Unicode composition, so it works everywhere: Browsers, chat apps, code editors, Word, you name it. Basically, anywhere you can type text, Mathpad lets you type mathematics. I built Mathpad after getting frustrated with the…
2025 · crowdsupply.com
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- 22IG
I’ve always found that online calculators tend to have bad UIs, especially on mobile. Most of the calculator websites I’ve come across use outdated and inconvenient ways of inputting data, or they format the results in confusing ways. I’ve noticed that fraction calculators (especially mixed fractions) are terrible to use, even on desktop. I haven’t built one of those yet, but it’s something I’m planning to tackle soon. This is a project I’ve always wanted to work on, but I’m relatively new to this space. So far, I’ve created a collection of simple calculators focused on math and finance. I’d…
2025
- 23PC
Hi. I have read lot of great articles on HN and it has helped me a lot in my journey as an independent developer. That's why it feels so good to share few promo codes for my first iPhone app. Below is a small description of the app: Calci - A simple and beautiful calculator that shows result instantly. Features: ✓ A beautiful looking calculator that is fast and friendly to use. ✓ Saves your time as results are displayed for each keystroke. ✓ Automatically prevents you from entering invalid calculations. ✓ Clear and large buttons make it easier and faster to calculate. ✓ Swipe complete…
2012
- 24OS
2024 · github.com
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