Comparison

Aptos End User vs Transformer Calc 2

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

Head to head
About

Aptos End User

Monitor your distributed PV power plants from anywhere. View real-time operating data, energy generation over various periods, and equipment alarms to ensure optimal performance and expected yield.

Highlights
  • Module-level monitoring
  • Real-time data display
  • Energy generation tracking (daily, monthly, annual, total)
  • Alarm information display
  • Operation monitoring
  • Yield optimization
Features
Read full description

Aptos End User is a mobile application developed by especially for owners of distributed PV power plants, which can absorb the operating data of PV power plantS from Aptos End User Cloud. There are more functions, such as module-level monitoring, real-time data display for both plant-level & module-level as well as daily, monthly, annual, and total energy display. Furthermore, you can easily see the alarm information with the equipment, which could assist the owner in monitoring the operation of the PV power plant, ensuring normal operation of the power plant and obtaining of the expected yield.

About

Transformer Calc 2

This app provides electricians with instant transformer sizing and advanced construction math, compliant with both US (NEC 2023) and Canadian (CEC 2024) electrical codes. It simplifies complex calculations for wire, conduit, and overcurrent protection, and includes a fractional construction calculator.

Highlights
  • Dual code compliance (NEC 2023, CEC 2024)
  • Instant transformer sizing
  • Wire and conduit sizing
  • Overcurrent protection calculation
  • Fractional construction calculator
  • Unit conversion
  • Dark mode support
Features
Read full description

The essential tool for electricians. Now updated for 2024 CEC and 2023 NEC. Instant transformer sizing and advanced construction math in one app. Description Simplify your electrical calculations with Transformer Calculator 2. Designed for professional electricians, electrical engineers, and apprentices, Transformer Calculator 2 eliminates the guesswork from complex electrical math. Whether you are sizing a new install or verifying an existing setup, this app provides instant, code-compliant results for both US (NEC 2023) and Canadian (CEC 2024) standards. KEY FEATURES: DUAL CODE COMPLIANCE Toggle Instantly: Seamlessly switch between the 2024 CEC (Canada) and 2023 NEC (USA) with a single tap in settings. Localized Standards: The app automatically adjusts wire types, ampacities, and conduit fill rules based on your selected code. COMPREHENSIVE TRANSFORMER SIZING Input Flexibility: Simply enter your KVA, primary and secondary voltages, and configuration (Delta or Wye). Instant Results: Get immediate calculations for Full Load Amps (FLA), Overcurrent Protection (Fuse or Breaker), and Bonding. Wire and Conduit: Automatically sizes your Primary and Secondary wires (minimum size and ampacity) and Conduits (minimum pipe size and fill) based on the latest tables. ADVANCED CONSTRUCTION CALCULATOR Fractional Math: Built-in construction calculator that handles feet, inches, and fractions (1/16, 1/8, etc.) with ease. Unit Conversion: Quickly convert between metric and imperial or different unit scales. Volume and Area: Perform complex dimensional calculations right on the job site. PROFESSIONAL AND CUSTOMIZABLE Detailed References: Extensive database of wire types (THHN, THW, XHHW, etc.) and conduit types (EMT, ENT, Rigid PVC, etc.). Dark Mode: Fully supports system Dark Mode and tinted icons for comfortable viewing in low-light job sites. Custom Settings: Set your default wire types, temperature ratings (60, 75, or 90 degrees C), and precision preferences to match your daily workflow. Stop flipping through code books for every calculation. Download Transformer Calculator 2 today and carry the code in your pocket.

Screenshots

Aptos End User4 screens
Transformer Calc 24 screens

Verdict

The call

The clearest difference is price: Aptos End User at Free against Transformer Calc 2's $3.99. Aptos End User also leads on rating (3.5 vs 1.0) and iOS requirement (12.0 vs 26.0). Transformer Calc 2's advantage is update cadence (every 2 months vs every 7 months). On review sentiment, ratings volume, 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

CostPrice · In-app purchases · Ads · Monetization

Aptos End User is free to download; Transformer Calc 2 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Aptos End User holds the better App Store score, 3.5 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

UpkeepUpdate frequency

Aptos End User ships an update every 7 months, Transformer Calc 2 every 2 months. The most recent releases landed on September 11, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
Aptos End User versus Transformer Calc 2: the parameters behind the verdict, then further details
ParameterAptos End UserTransformer Calc 2
PriceFree — better$3.99
Rating3.5 (2 ratings) — better1.0 (1 ratings)
Positive reviews0.0% of reviews0.0% of reviews
Number of ratings2 — better1
Update frequencyEvery 7 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better26.0
Further details — not scored
Size31 MB16 MB
Age rating4+4+
DeveloperAptos Solar Technology LLCSnappy Appz Inc.

Customer experience

Aptos End User

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Transformer Calc 2

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Aptos End User

No in-app purchases

None

Transformer Calc 2

No in-app purchases

Questions

Is Aptos End User free?
Aptos End User is free to download, with no in-app purchases.
Is Transformer Calc 2 free?
Transformer Calc 2 costs $3.99, with no in-app purchases.
Which has better reviews, Aptos End User or Transformer Calc 2?
Aptos End User is rated higher. Aptos End User averages 3.5 out of 5 from 2 ratings, while Transformer Calc 2 averages 1.0 from 1 ratings.
Do Aptos End User or Transformer Calc 2 have ads?
Neither Aptos End User nor Transformer Calc 2 shows ads.
Which is updated more often, Aptos End User or Transformer Calc 2?
Aptos End User ships an update every 7 months, and Transformer Calc 2 every 2 months. Most recently, Aptos End User was updated on September 11, 2026 and Transformer Calc 2 on June 1, 2026.

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