Comparison

Phase Calc vs Metric Converters

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

Head to head
About

Phase Calc

This advanced engineering app performs complex electrical calculations for three-phase power systems. It offers tools for students, technicians, and engineers to analyze unbalanced systems, perform sequence transformations, and access reference libraries. Results can be easily exported for documentation and sharing.

Highlights
  • Symmetrical component analysis
  • Three-phase power system calculations
  • Phase-to-sequence and sequence-to-phase transformations
  • Polar and rectangular input support
  • Specialized calculators and reference libraries
  • Exportable results for documentation
Features
Read full description

Phase Calc for iOS is an advanced engineering app for most electrical designs, expecially symmetrical component analysis and three-phase power system calculations. Built for students, teachers, technicians, and engineers, it combines a polished mobile experience with a powerful technical workflow for fast, accurate analysis of unbalanced three-phase systems in the field, lab, or classroom. The app performs both phase-to-sequence and sequence-to-phase transformations, with support for inputs in polar and rectangular form. It quickly resolves three unbalanced phase quantities into their positive-, negative-, and zero-sequence components, making it a practical tool for protection studies, fault analysis, system modeling, relay validation, and coursework. More than a single-purpose calculator, Phase Calc is packed with specialized calculators, technical reference libraries, and built-in formulas to support everyday power systems work. Whether you are checking values, reviewing theory, or working through engineering problems more efficiently, the app puts essential tools in one place. Results can be exported instantly, including vector data for plotting and graphical analysis, as well as technical report exports for documentation, review, and sharing. With powerful capabilities in a streamlined interface, Phase Calc delivers a complete mobile toolkit for three-phase analysis on iPhone and iPad.

About

Metric Converters

Features
Read full description

This is the Converter Maniacs Mobile Metric Converter. It can convert between twenty different metric prefixes: Yotta, Zetta, Exa, Peta, Tera, Giga, Mega, Kilo, Hecto, Deka, Deci, Centi, Milli, Micro, Nano, Pico, Femto, Atto, Zepto, and Yocto. Not only can it convert between all of those prefixes, but it will also give you the formula and illustrate what you are converting with pictures. The app is fast, intuitive, and easy to use. It is a standalone app, which means that it will work perfectly fine in places with little or no Internet access. We hope this will become one of your favorite utility apps on your phone.

Screenshots

Phase Calc4 screens
Metric Converters4 screens

Verdict

The call

The clearest difference is price: Metric Converters at Free against Phase Calc's $1.99. Metric Converters also leads on iOS requirement (14.1 vs 17.0). Phase Calc's advantage is update cadence (every 6 weeks vs every 38 months). On ads, in-app purchases and device support 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

Metric Converters is free to download; Phase Calc costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Phase Calc ships an update every 6 weeks, Metric Converters every 38 months. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
Phase Calc versus Metric Converters: the parameters behind the verdict, then further details
ParameterPhase CalcMetric Converters
Price$1.99Free — better
Rating5.0 (4 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 6 weeks — betterEvery 38 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.014.1 — better
Further details — not scored
Size13 MB20 MB
Age rating4++4
DeveloperDonnie HermanH Valeur

In-app purchases

None

Phase Calc

No in-app purchases

None

Metric Converters

No in-app purchases

Questions

Is Phase Calc free?
Phase Calc costs $1.99, with no in-app purchases.
Is Metric Converters free?
Metric Converters is free to download, with no in-app purchases.
Do Phase Calc or Metric Converters have ads?
Neither Phase Calc nor Metric Converters shows ads.
Which is updated more often, Phase Calc or Metric Converters?
Phase Calc ships an update every 6 weeks, and Metric Converters every 38 months. Most recently, Phase Calc was updated on October 23, 2026 and Metric Converters on October 30, 2026.

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