Comparison

Custom Unit Converter vs PhysicsCalc

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

Head to head
About

Custom Unit Converter

Features
Read full description

MyUnit is a flexible unit conversion app that lets you freely add your own categories and units. In addition to standard conversions such as length, area, volume, temperature, weight, and speed, MyUnit also supports specialized units used in engineering, science, research, and business, including flow rate, pressure, vacuum, energy, power, force, resistance, frequency, and more. Many unit conversion apps only support pre-installed units. This can be inconvenient when the unit you need is missing or when the app does not fit your workflow. MyUnit solves this by allowing you to create your own categories and add the units you need. For example, you can create categories such as Pressure, Flow Rate, Temperature, or Vacuum, and register units such as Pa, psi, sccm, slpm, Torr, and more. MyUnit also supports multi-step calculations. In addition to simple multiplication-based conversion, you can create flexible conversion rules using ×, ÷, +, −, and ^. This makes it easier to handle conversions that cannot be expressed with only one simple factor. If you often calculate special formulas manually, MyUnit can help you save time. With this update, MyUnit now supports CSV export. You can export registered categories, units, and conversion data in CSV format. This makes it easier to check, organize, record, and share the data you created in the app. CSV export is useful for reviewing unit lists in spreadsheet software, organizing conversion rules, keeping research or work records, sharing data, and creating documents. Main Features 1. Add categories and units freely Create your own categories and register the units you need. 2. Multi-step calculations Create custom conversion rules using ×, ÷, +, −, and ^. 3. CSV export Export registered categories, units, and conversion data as CSV files. 4. Automatic conversion Enter one value and other units in the same category are automatically calculated. 5. Easy copy operation Copy conversion results quickly for reports, notes, emails, documents, and spreadsheets. 6. Rearrange categories and units Place frequently used categories and units at the top for faster access. 7. Useful for technical fields Suitable for engineering, science, research, experiments, design, development, evaluation, maintenance, and on-site checks. 8. Useful for everyday conversion Also convenient for daily conversions such as length, temperature, weight, volume, area, and speed. Recommended For ・People who want to add their own categories and units ・People who handle engineering, scientific, or technical units ・Researchers, students, engineers, technicians, and developers ・People who check overseas specifications or technical documents ・People who want to manage conversion data with CSV files Use Cases Students and researchers Useful for assignments, reports, experiments, research data, and unit conversion records. Engineers and technicians Useful for checking flow rate, pressure, vacuum, power, energy, equipment specifications, sensor specifications, and design values. Data management and sharing Export categories, units, and conversion data as CSV files and use them in spreadsheet software for review, records, and sharing. Supported Category Examples Temperature, length, area, volume, angle, weight, time, speed, power, energy, electric charge, frequency, data transfer rate, electric current, resistance, acceleration, force, flow rate, pressure, and more. Why Choose MyUnit ・Create your own categories ・Use ×, ÷, +, −, and ^ ・Export data in CSV format ・Automatically convert multiple units at once ・Rearrange categories and units ・Useful for work, research, study, and daily life MyUnit is not just a unit conversion app. It lets you customize categories, units, and conversion rules to match your needs. Premium Features ・Ad-free experience Terms of Use:https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy:http://244div.com/privacy-policy/

About

PhysicsCalc

This app provides a comprehensive collection of physics formulas, calculations, and solutions. It offers a unit converter, physical constants, and history of calculations, with advanced features like dependency graphs and error calculation available via a one-time purchase.

Highlights
  • 126 physics formulas
  • Smart calculation with instant results
  • Step-by-step solutions
  • Unit converter
  • Physical constants
  • Dependency graphs
  • Error calculator
Features
Read full description

PhysicsCalculator is your pocket physics assistant. 126 formulas across 6 sections: mechanics, thermodynamics, electromagnetism, optics, oscillations & waves, and modern physics. FREE: • 56+ formulas — 2 from each subsection • Smart calculation — select the unknown variable, enter the rest, get instant results • Step-by-step solutions — detailed breakdown of every calculation • Unit converter — 13 categories, 80+ units of measurement • Physical constants — speed of light, Planck's constant, and more • History — all your calculations at your fingertips • 6 languages — English, Russian, German, Spanish, French, Chinese • Dark mode — comfortable work in any environment PREMIUM — ONE-TIME PURCHASE: • All 126 formulas — from high school to university level • Dependency graphs — visualize how one quantity depends on another • Error calculator — error propagation using partial derivatives • Favorites — save important calculations • PDF export — share your results PHYSICS SECTIONS: ▸ Mechanics — kinematics, dynamics, conservation laws, statics ▸ Thermodynamics — gas laws, heat transfer, molecular physics ▸ Electromagnetism — Coulomb's law, Ohm's law, electromagnetic induction ▸ Optics — refraction, lenses, diffraction ▸ Oscillations & Waves — pendulum, wave equation, sound ▸ Modern Physics — photoelectric effect, atomic physics, nuclear reactions The app is fully offline — no internet required, no data collected. Perfect for students, teachers, and physics enthusiasts.

Screenshots

Custom Unit Converter4 screens
PhysicsCalc4 screens

Verdict

The call

The clearest difference is price: Custom Unit Converter at Free against PhysicsCalc's $19.99. Custom Unit Converter also leads on update cadence (fortnightly vs every 3 months). PhysicsCalc's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement 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

Custom Unit Converter is free to download; PhysicsCalc costs $19.99 up front. Custom Unit Converter sells 1 in-app purchase, starting at $0.49 per month and PhysicsCalc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Custom Unit Converter ships an update fortnightly, PhysicsCalc every 3 months. The most recent releases landed on October 30, 2026 and October 19, 2026 respectively.

Scorecard3 real differences · 6 level
Custom Unit Converter versus PhysicsCalc: the parameters behind the verdict, then further details
ParameterCustom Unit ConverterPhysicsCalc
PriceFree — better$19.99
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyFortnightly — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.216.0 — better
Further details — not scored
Size12 MB10 MB
Age rating4+4+
DeveloperTsuyoshi NinomiyaRustam Elmuradov

In-app purchases

1 purchases

Custom Unit Converter

Subscriptions1
  • MyUnit7 Days trial$0.491 Month
1 purchases

PhysicsCalc

One-time1
  • All Formulas$1.99

Questions

Is Custom Unit Converter free?
Custom Unit Converter is free to download, with in-app purchases available.
Is PhysicsCalc free?
PhysicsCalc costs $19.99, and also offers in-app purchases.
Do Custom Unit Converter or PhysicsCalc have ads?
Custom Unit Converter shows ads; PhysicsCalc does not.
Which is updated more often, Custom Unit Converter or PhysicsCalc?
Custom Unit Converter ships an update fortnightly, and PhysicsCalc every 3 months. Most recently, Custom Unit Converter was updated on October 30, 2026 and PhysicsCalc on October 19, 2026.

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