GUTCalc Physics Unit Converter vs Unit Eater
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
Unit Eater
This utility app functions as a powerful calculator that handles unit conversions and calculations. It supports a vast array of predefined units and allows users to define their own, making it ideal for scientific and academic tasks. Features include a calculation history, customizable results, and dark mode.
- Unit conversion and calculation
- Custom unit definition
- Extensive unit library
- Calculation history
- Customizable result format
- Dark mode
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Unique calculator that not only converts units, but can also perform calculations with them. Perfect for school, university, work, or personal use! For math, physics, chemistry, biology, engineering, or any other natural sciences! - Standard calculator functions usable with or without units - Target unit freely definable - Define your own units if you need them - History of recent calculations - Quick transfer of parts or entire calculations from history - ANS function to dynamically use the last result - Customizable result format - Quick search - Quick access to important functions like square or cube - Undo and redo of last steps - Dark mode Boost your productivity, focus on the essentials, and leave conversion errors in the past! Supports many units, prefixes, and constants: * Prefixes: kilo, mega, giga, tera, centi, milli, micro, nano, … * Constants: mass of proton, neutron, electron, Avogadro's constant, electric field constant, gas constant, Planck's constant, … * Angles: radian, degree, degree-minute, degree-second, gradian, turn, steradian, … * Length: meter, mile, inch, foot, yard, nautical mile, chain, furlong, cable length, rod, … * Area: square meter, hectare, acre, are, square kilometer, square inch, square foot, square yard, … * Volume: liter, cubic meter, fluid ounce, gallon, gill, pint, quart, barrel, tablespoon, teaspoon, … * Mass: gram, ton, ounce, pound, carat, grain, … * Time: second, minute, hour, day, year, … * Speed: meter per second, kilometer per hour, miles per hour, knot, speed of light, … * Acceleration: gravitational acceleration, meter per second squared, … * Energy: joule, kilocalorie, erg, watt-hour, electronvolt, … * Power: watt, horsepower, … * Force: Newton, pond, kilopond, tf, ozf, lbf, … * Torque: Newton meter, ozfin, ozfft, lbf*in, … * Frequency: Hertz, revolutions per minute, … * Pressure: pascal, bar, atm, at, Torr, mmHg, osi, ose, psi, psf, … * Viscosity: Poise, Stokes, … * Density: gram per cubic centimeter, kg per cubic meter, … * Radiation: Becquerel, Curie, Rutherford, Roentgen, Gray, Sievert, rem, … * Light: candela, lumen, lux * Electricity: volt, ampere, ohm, coulomb, elementary charge, farad, siemens, … * Magnetism: Weber, Tesla, Henry, … Is your desired unit not listed? You can define any additional units! Privacy Policy: https://www.iubenda.com/privacy-policy/22446614 Terms and Conditions: https://www.iubenda.com/terms-and-conditions/22446614
Screenshots
Verdict
The clearest difference is update cadence: Unit Eater at every 2 weeks against GUTCalc Physics Unit Converter's every 4 months. On price, review sentiment, ads and in-app purchases 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
Both are free to download. GUTCalc Physics Unit Converter sells 1 one-off in-app purchase and Unit Eater sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
GUTCalc Physics Unit Converter ships an update every 4 months, Unit Eater every 2 weeks. Both last shipped on September 11, 2026.
| Parameter | GUTCalc Physics Unit Converter | Unit Eater |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 6 — better | — |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Mac |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 65 MB |
| Age rating | 4+ | 4+ |
| Developer | Timothy Wiser | Tom Leon Schmidt |
Customer experience
GUTCalc Physics Unit Converter
Unit Eater
In-app purchases
GUTCalc Physics Unit Converter
- GUTCalc Pro$2.99
Unit Eater
- Premium - Monthly$0.991 Month
- Premium - Pay once$3.99
Questions
Is GUTCalc Physics Unit Converter free?
Is Unit Eater free?
Do GUTCalc Physics Unit Converter or Unit Eater have ads?
Which is updated more often, GUTCalc Physics Unit Converter or Unit Eater?
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