Comparison

Phase Calc vs Construction Calc

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

Construction Calc

Features
Read full description

C-Calc is a calculator application designed by, and for construction workers or anyone else who works with measurements in feet and inches. C-Calc is a full function calculator that works as a standard calculator but more importantly allows you to work in feet, inches, and fractional inches. Features include; - add, subtract, multiply, divide, power, root, and more with measurements in feet, inches, and fractional inches - use the scaling feature to quickly and easily scale drawings - calculate miter angles - calculate triangle angles and lengths - calculate spacing for things such as ballisters - calculate material quantities and cost based on area coverage - reuse any entered value from history list - automatically round results to a user defined precision (ie. sixteenths) - reduce fractions and fractional inches to their lowest common denominator - 50 memory locations featuring add, subtract, set, recall, and clear - split screen shows decimal value, feet/inch value, memory, and scaling all at once in large easy to read fonts - calculate areas and volumes easily - full instructions and video tutorial available at www.ccalc.snappyappz.com

Screenshots

Phase Calc4 screens
Construction Calc4 screens

Verdict

The call

The clearest difference is price: Phase Calc at $1.99 against Construction Calc's $7.99. Phase Calc also leads on iOS requirement (17.0 vs 26.0). On update cadence, 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

Phase Calc costs $1.99 and Construction Calc $7.99 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, Construction Calc monthly. The most recent releases landed on August 1, 2026 and September 21, 2026 respectively.

Scorecard2 real differences · 8 level
Phase Calc versus Construction Calc: the parameters behind the verdict, then further details
ParameterPhase CalcConstruction Calc
Price$1.99 — better$7.99
Rating5.0 (4 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 6 weeksMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better26.0
Further details — not scored
Size13 MB27 MB
Age rating4+4+
DeveloperDonnie HermanSnappy Appz Inc.

In-app purchases

None

Phase Calc

No in-app purchases

None

Construction Calc

No in-app purchases

Questions

Is Phase Calc free?
Phase Calc costs $1.99, with no in-app purchases.
Is Construction Calc free?
Construction Calc costs $7.99, with no in-app purchases.
Do Phase Calc or Construction Calc have ads?
Neither Phase Calc nor Construction Calc shows ads.
Which is updated more often, Phase Calc or Construction Calc?
Phase Calc ships an update every 6 weeks, and Construction Calc monthly. Most recently, Phase Calc was updated on August 1, 2026 and Construction Calc on September 21, 2026.

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