Comparison

GUTCalc Physics Unit Converter vs Propagation Tools

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

GUTCalc Physics Unit Converter

This calculator handles complex physics calculations with units. It supports SI, natural, and CGS units, physical constants, and functions. It automatically converts units and flags algebraic errors, with an option to upgrade for advanced organization and syncing features.

Highlights
  • SI, Natural, and CGS unit modes
  • Automatic unit conversion
  • Physical constants and functions
  • Implied multiplication
  • Custom keyboards
  • Unit checking for algebraic errors
  • Share and save results
Read full description

GUTCalc is a calculator that understands units. Enter a free-form expression consisting of arithmetic, SI and non-SI units, physical constants (like Planck's constant h or the speed of light c), and functions (like exp, arctan, and cosh) and GUTCalc will work out the answer including any necessary conversions. Natural units are fully supported, and are great for calculations in particle physics and quantum field theory. SI mode is perfect for quick and easy calculations of everyday quantities. FEATURES: * Choose from SI and three types of Natural unit modes. In Natural unit mode, various physical constants (such as hbar, c, kb, and eps0) are set to 1. GUTCalc automatically inserts factors of these constants to perform conversions and calculations in Natural units. * Gaussian CGS (dynes, ergs, esus, and statvolts) and Planck (quantum gravity) units are also supported. * Multiplication is implied: no need to insert *s everywhere. * Custom-designed keyboards for quick and easy input of common units, constants, and functions---or switch to the built-in keyboard for free-form input. * Calculations can extend over many orders of magnitude without overflow. Need to calculate exp(10000)? No problem. (Available on iOS 11+ and 64-bit devices running iOS 10) * Avoid algebraic errors thanks to GUTCalc's unit checking: inconsistent calculations are flagged in red with an explanatory message. * Share your results via email or save them in a note using the share feature. * Physical constants are updated to the latest values recommended by the Particle Data Group 2020 review, CODATA 2018, and the 2019 redefinition of SI base units. * Suggestions for features and additional constants are welcome. UPGRADE TO PRO FOR EXTRA FEATURES: * Create and manage multiple notebooks to keep your calculations organized * Sync notebooks with iCloud across multiple devices, including the macOS version of GUTCalc * Share notebooks with collaborators * Support the development of more pro features in the future

About

Propagation Tools

Features
Read full description

Propagation tools to include Free Space Loss, Link Margin, UHF LOS, EIRP, Fade Margin and graphs

Screenshots

GUTCalc Physics Unit Converter4 screens
Propagation Tools4 screens

Verdict

The call

The clearest difference is price: GUTCalc Physics Unit Converter at Free against Propagation Tools's $0.29. GUTCalc Physics Unit Converter also leads on update cadence (every 4 months vs every 9 months) and device support (4 vs 2). Propagation Tools's advantage is in-app purchases (none vs 1). On ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

GUTCalc Physics Unit Converter is free to download; Propagation Tools costs $0.29 up front. GUTCalc Physics Unit Converter sells 1 one-off in-app purchase. Propagation Tools asks for nothing beyond the download.

UpkeepUpdate frequency

GUTCalc Physics Unit Converter ships an update every 4 months, Propagation Tools every 9 months. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

Scorecard5 real differences · 5 level
GUTCalc Physics Unit Converter versus Propagation Tools: the parameters behind the verdict, then further details
ParameterGUTCalc Physics Unit ConverterPropagation Tools
PriceFree — better$0.29
Rating5.0 (6 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings6 — better—
Update frequencyEvery 4 months — betterEvery 9 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size3 MB1 MB
Age rating4+4+
DeveloperTimothy WiserJeff Curtis

In-app purchases

1 purchases

GUTCalc Physics Unit Converter

One-time1
  • GUTCalc Pro$2.99
None

Propagation Tools

No in-app purchases

Questions

Is GUTCalc Physics Unit Converter free?
GUTCalc Physics Unit Converter is free to download, with in-app purchases available.
Is Propagation Tools free?
Propagation Tools costs $0.29, with no in-app purchases.
Do GUTCalc Physics Unit Converter or Propagation Tools have ads?
Neither GUTCalc Physics Unit Converter nor Propagation Tools shows ads.
Which is updated more often, GUTCalc Physics Unit Converter or Propagation Tools?
GUTCalc Physics Unit Converter ships an update every 4 months, and Propagation Tools every 9 months. Most recently, GUTCalc Physics Unit Converter was updated on November 3, 2026 and Propagation Tools on October 27, 2026.

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