Readest
Focus: ebook reader, epub and annotations. Shares open source and github with Qalculate!. Adds macOS, iOS and Android. Same 4.6 rating.
Desktop AppFreeWindows, macOS
4.6Visit
Desktop App
Qalculate!
A powerful desktop calculator for maths, units and currency conversions.
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
What is Qalculate!?
Qalculate! is a free, open-source calculator for Windows and Linux that understands everyday expressions as you type them. It handles unit and currency conversion, physical constants, symbolic maths, equation solving and plotting, which makes quick calculations and sanity checks much faster.
Third-party open-source projects. We are not affiliated with their authors; repositories are provided as-is by their maintainers. Review each project's license, code and security before installing. See our Disclaimer.
Pros
- Understands natural expressions
- Units and currencies built in
- Free and open source
Cons
- Mac version needs Homebrew or MacPorts
- Many features to learn
Who should use Qalculate!
Students, engineers and analysts who do lots of quick calculations and conversions.
Who may not need it
People who only need basic arithmetic.
Qalculate! alternatives
Similar resources to Qalculate!, picked from the directory.
Sioyek
Focus: pdf reader, research papers and keyboard. Shares open source and github with Qalculate!. Adds macOS. Same 4.6 rating.
Desktop AppFreeWindows, macOS
4.6Visit
Xournal++
Focus: handwriting, pdf annotation and pen input. Shares open source and github with Qalculate!. Adds macOS. Same 4.6 rating.
Desktop AppFreeWindows, macOS
4.6Visit
Fluent Reader
Focus: rss reader, news feeds and reading. Shares open source and github with Qalculate!. Adds macOS. Rated 4.5 (Qalculate!: 4.6).
Desktop AppFreeWindows, macOS
4.5Visit
Ossium
Focus: contributions, good first issue and gsoc. Shares open source with Qalculate!. A website, not a desktop app. Adds Web. Rated 4.5 (Qalculate!: 4.6).
WebsiteFreeWeb
4.5Visit
Web Dev Resources
Focus: web development, resources and curated. Shares github with Qalculate!. Adds Web. Rated 4.3 (Qalculate!: 4.6).
OtherFreeWeb
4.3Visit
Free alternatives to Qalculate!
Free resources that cover similar ground.
Omni Calculator
Focus: finance and conversions. Shares calculator and maths with Qalculate!. A website, not a desktop app. Adds Web, iOS and Android. Same 4.6 rating.
WebsiteFreeWeb, iOS
4.6Visit
Open Notebook
Focus: notebooklm alternative, research and ai chat. Shares open source and github with Qalculate!. An AI tool, not a desktop app. Adds Web. Same 4.6 rating.
AI ToolFreeWeb, Cross-Platform
4.6Visit
Awesome Jev Projects
Focus: awesome list, discovery and curated. Shares open source and github with Qalculate!. A website, not a desktop app. Adds Web. Rated 4.4 (Qalculate!: 4.6).
WebsiteFreeWeb
4.4Visit
OpenBiliClaw
Focus: content discovery, ai agent and local-first. Shares open source and github with Qalculate!. An AI tool, not a desktop app. Adds Web and Chrome. Rated 4.4 (Qalculate!: 4.6).
AI ToolFreeCross-Platform, Web
4.4Visit
Cybersecurity Projects
Focus: cybersecurity, projects and portfolio. Also in Learning and Research, like Qalculate!. A course, not a desktop app. Adds Web. Rated 4.8 (Qalculate!: 4.6).
CourseFreeWeb
4.8Visit
navi
Focus: terminal, cli and cheatsheet. Shares open source with Qalculate!. Adds macOS. Rated 4.8 (Qalculate!: 4.6).
Desktop AppFreemacOS, Windows
4.8Visit
Are you the maker of Qalculate!?Get a free Featured badge for your site, a share image and ready-to-paste posts. No sign-up.
Free Notion database
1,100+ ways people are making money online
Real online businesses, creators and projects, broken down by how they make money: apps, online stores, AI tools and more. Free on Gumroad.
Get the free databaseFree Notion database
399+ ways to make money online
Hundreds of online income methods in one place, so you can compare options and pick one to try. Free on Gumroad.
Get the free listFor research and ideas only. Results vary and nothing here is a promise of income. See our Disclaimer.
Weekly newsletter
Everything new, every Monday.
One short email every Monday with everything shipped that week: new free tools and websites, new guides, new free browser tools and what's new in my free Gumroad libraries, plus how the site is growing. Free, and you can unsubscribe anytime.
Join the newsletterYou sign up on Gumroad, which stores your email to send the newsletter. See our Privacy Policy.