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Head-to-head · Calculators

Qalculate! vs Omni Calculator

  • Updated Oct 2026
  • Both researched from official sources
  • 7 checks side by side
Higher score Qalculate! #1 in Calculators 9.3/10 Free plan Free plan✓ 6 of 6 features Visit Qalculate!
Omni Calculator #3 in Calculators 9.0/10 Free plan Free plan✓ 4 of 6 features Try Omni Calculator

Qalculate! leads on 0 checks, Omni Calculator on 0, and 7 are even. Who comes out ahead on the 7 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreQalculate! · 9.3/10
  • Free planboth
  • Most featuresQalculate! · 6 of 6

Qalculate! scores higher on our rubric for calculators: 9.3 against 9.0 out of 10; our editors rank them #1 and #3.

Qalculate! is the better fit for desktop users needing a powerful all-purpose calculator. Omni Calculator is the better fit for people seeking specialized calculators and worked examples.

  • Qalculate! fits best

    Desktop users needing a powerful all-purpose calculator

  • Omni Calculator fits best

    People seeking specialized calculators and worked examples

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Qalculate! 9.3/10 Visit ↗ Omni Calculator 9.0/10 Visit ↗
At a glance
Editor score 9.3 9.0
Ranking #1 in Calculators #3 in Calculators
Best for Desktop users needing a powerful all-purpose calculator People seeking specialized calculators and worked examples
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Desktop Cloud, Mobile
Platforms Windows, Linux, macOS Web, Android
Support Docs Email, Docs
Built for Solo, Small business Solo, Small business, Mid-market, Enterprise
Features Qalculate! 6/6 · Omni Calculator 4/6
Scientific functions ✓ ✓
Graphing ✓ ✓
Equation solver ✓ ✓
Financial functions ✓ ✓
Offline mode ✓ (best) Not checked yet
Calculation history ✓ (best) Not checked yet
Our review
Pros
  • Evaluates expressions with variables, units, and functions
  • Combines symbolic math, equation solving, and graphing
  • Offers over 400 functions plus searchable calculation history
  • Thousands of calculators span math, science, finance, health and construction.
  • Two-way inputs, unit conversions and currency conversions help solve varied problems.
  • Articles explain formulas; Android adds search, favorites and recent calculators.
Cons
  • Desktop software only, with no mobile platform listed
  • Support channels are limited to documentation
  • Its broad feature set may be more than basic calculations require
  • The Android app is available, but iOS is not offered.
  • Locally saved input values are limited to the browser.
  • It focuses on calculations rather than building custom spreadsheets or formulas.
Our verdict

Qalculate! is a free, open-source desktop calculator for people who need more than basic arithmetic. Its graphical GTK and Qt interfaces and command-line interface are available on Windows, Linux, and macOS. It handles expressions with…

Read the review →

Omni Calculator is a free library of specialized calculators for students, professionals and general users who want answers without building formulas themselves. Its web and Android offerings cover math, science, finance, health,…

Read the review →
  1. Qalculate!Calculators 9.3Free plan
  2. Omni CalculatorCalculators 9.0Free plan

Strengths and trade-offs

  • Qalculate! — where it wins

    • Evaluates expressions with variables, units, and functions
    • Combines symbolic math, equation solving, and graphing
    • Offers over 400 functions plus searchable calculation history

    Where it doesn't

    • Desktop software only, with no mobile platform listed
    • Support channels are limited to documentation
    • Its broad feature set may be more than basic calculations require

  • Omni Calculator — where it wins

    • Thousands of calculators span math, science, finance, health and construction.
    • Two-way inputs, unit conversions and currency conversions help solve varied problems.
    • Articles explain formulas; Android adds search, favorites and recent calculators.

    Where it doesn't

    • The Android app is available, but iOS is not offered.
    • Locally saved input values are limited to the browser.
    • It focuses on calculations rather than building custom spreadsheets or formulas.

More comparisons

All calculators comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update