Comparison

LED Ohm Calc vs Transformer Calculator Plus

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

Head to head
About

LED Ohm Calc

This utility simplifies calculating LED resistors by handling various voltages, decimal values, and multiple LEDs. It offers intuitive input methods for power supply and LED ratings, making complex calculations straightforward.

Highlights
  • Calculate LED resistors
  • Handle various power supply voltages
  • Input decimal LED voltage ratings
  • Calculate current and wattage
  • Support for multiple LEDs
  • Intuitive slide bar and text input
Features
Read full description

Isn't LED resistor calculation troublesome? When calculating LED resistors, you may find it challenging due to the following: 1.The variety of power supply voltages and microcontroller output voltages 2.Voltage values with decimals (e.g., 3.5–3.7V for blue and white LEDs) 3.Current value calculations 4.Calculations involving multiple LEDs 5.Power consumption (wattage) calculations Features of this App This app simplifies complex calculations using an intuitive slide bar and a text field for manual input. Specifications 1.Power Supply Voltage The slide bar allows settings up to 12V, but you can input higher values using the text field. 2.LED Ratings The slide bar has limits of 4.0V and 50mA, but the text field allows you to input values without restrictions. 3.Closing the Numeric Keypad To close the keypad, press the [Done] button. Share Your Feedback While we may not be able to address every request, we welcome your suggestions and feedback. If you enjoy the app, please consider leaving a review!

About

Transformer Calculator Plus

This utility app calculates key parameters for transformers, including voltage, current, and turns ratio. It helps determine if a transformer is step-up or step-down, essential for power conversion applications.

Highlights
  • Calculate primary and secondary voltage
  • Calculate primary and secondary current
  • Calculate transformer turns ratio
  • Determine step-up or step-down transformer
  • Supports AC voltage calculations
Features
Read full description

Transformer Calculator calculate any parameter within the transformer equation, including primary and secondary voltage, current, and turns. Transformer Calculations Include: Transformer Turns Ratio – Current and Turns Transformer Turns Ratio – Voltage and Turns Transformer Turns Ratio – Voltage and Current The result will indicate whether the transformer is step-up or step-down. Transformers are primarily used as power converters. The two types—step-up and step-down—operate on the same principle but in opposite directions. A step-up transformer converts a lower AC voltage to a higher voltage, while a step-down transformer reduces a higher AC voltage to a lower level. For example, if a country uses 110 V power, a step-up transformer converts it to 220 V, and a step-down transformer does the reverse. Both work with alternating current (AC). A transformer consists of a soft iron core with two coils wound around it, which are not electrically connected. These coils may be wound on separate limbs of the iron core or placed one over the other. The coil to which the alternating voltage is applied is called the primary coil or primary winding. When an alternating voltage is applied, the resulting alternating current in the primary winding generates a changing magnetic field. This changing field induces an alternating current in the secondary coil. The magnitude of the induced voltage depends on the number of turns in the secondary winding. All transformers have a nameplate rating. It is best to operate them within the voltage limits specified. Using a step-down transformer below its rated limit can support a wide range of applications, but exceeding the specified limit is dangerous and may cause electrical failure. The relationship between voltage, current, and the number of turns in each coil is given by: Vp/Vs = Np/Ns = Is/Ip Where: Vp – Primary voltage Vs – Secondary voltage Np – Primary turns Ns – Secondary turns Ip – Primary current Is – Secondary current Thank you for your support, and please visit nitrio.com for more apps for your iOS devices.

Screenshots

LED Ohm Calc4 screens
Transformer Calculator Plus4 screens

Verdict

The call

The clearest difference is review sentiment: LED Ohm Calc at 64% against Transformer Calculator Plus's 0%. LED Ohm Calc also leads on rating (4.3 vs 3.3) and update cadence (every 10 days vs every 45 months). Transformer Calculator Plus's advantage is iOS requirement (13.0 vs 15.6). On ratings volume, ads, in-app purchases and monetization model 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

LED Ohm Calc costs $0.99 and Transformer Calculator Plus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

LED Ohm Calc holds the better App Store score, 4.3 against 3.3. Both are backed by a comparable volume of ratings — 6 and 4 respectively. Written reviews point the same way: 64% of LED Ohm Calc's written reviews are positive against 0% of Transformer Calculator Plus's.

UpkeepUpdate frequency

LED Ohm Calc ships an update every 10 days, Transformer Calculator Plus every 45 months. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

Scorecard5 real differences · 5 level
LED Ohm Calc versus Transformer Calculator Plus: the parameters behind the verdict, then further details
ParameterLED Ohm CalcTransformer Calculator Plus
Price$0.99 — better$2.99
Rating4.3 (6 ratings) — better3.3 (4 ratings)
Positive reviews64.3% of reviews — better0.0% of reviews
Number of ratings6 — better4
Update frequencyEvery 10 days — betterEvery 45 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.613.0 — better
Further details — not scored
Size2 MB1 MB
Age rating4+4+
DeveloperMimi Apps&technologiesNitrio

Customer experience

LED Ohm Calc

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews14 reviews
Positive64.3%
Neutral0.0%
Negative35.7%

Transformer Calculator Plus

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

LED Ohm Calc

No in-app purchases

None

Transformer Calculator Plus

No in-app purchases

Questions

Is LED Ohm Calc free?
LED Ohm Calc costs $0.99, with no in-app purchases.
Is Transformer Calculator Plus free?
Transformer Calculator Plus costs $2.99, with no in-app purchases.
Which has better reviews, LED Ohm Calc or Transformer Calculator Plus?
LED Ohm Calc is rated higher. LED Ohm Calc averages 4.3 out of 5 from 6 ratings, while Transformer Calculator Plus averages 3.3 from 4 ratings.
Do LED Ohm Calc or Transformer Calculator Plus have ads?
Neither LED Ohm Calc nor Transformer Calculator Plus shows ads.
Which is updated more often, LED Ohm Calc or Transformer Calculator Plus?
LED Ohm Calc ships an update every 10 days, and Transformer Calculator Plus every 45 months. Most recently, LED Ohm Calc was updated on October 15, 2026 and Transformer Calculator Plus on October 14, 2026.

Other comparisons