Napkin Calculator and Notepad is described as 'Napkin is a unique mix between a notepad and a calculator. Doing quick calculations on your phone has never been easier!' and is a Calculator in the Education & Reference category. There are more than 10 alternatives to Napkin Calculator and Notepad for a variety of platforms, including Online / Web-based, Mac, Windows, Self-Hosted solutions and SaaS. The best alternative is OpalCalc, which is free. Other great apps like Napkin Calculator and Notepad are Numi (Freemium), Soulver (Paid), NoteCalc (Free, Open Source) and Caligator (Free, Open Source).
OpalCalc is a brand new type of calculator for the PC. As easy to use as Notepad or a word processor, OpalCalc allows natural language in the sum and multi-line support so you can go back and adjust your previous calculations on the fly.
Soulver is a smart notepad with a built-in calculator. It gives instant answers to any calculations it finds in your text. It's a better way to work stuff out than with a traditional calculator, and a more lightweight tool for quick calculations than a spreadsheet.
A kickass, open-source calculator that lets you do calculations and unit conversions naturally, with features like: - weight conversion - length conversion - temperature conversion - currency conversion Super simple to use. Caligator works the way you think.
Calculist is an open source application that facilitates effective thinking. Write down your thoughts, ideas, and data in the form of lists. Focus your attention by zooming in to a specific list, and zoom out to see the broader context.
The Collaborative Computational Notebook Built for Modern Engineering. Enter math as it appears on paper, get instantaneous results, and share your calculations with colleagues and clients. No special syntax, no software, no headaches, no kidding.