# Ohms Law Calc. vs Data Center Engineer Toolkit

The clearest difference is ads: Data Center Engineer Toolkit at none against Ohms Law Calc.'s shown. Data Center Engineer Toolkit also leads on update cadence (every 2 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Ohms Law Calc. sells 1 one-off in-app purchase and Data Center Engineer Toolkit sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Ohms Law Calc. ships an update every 2 months, Data Center Engineer Toolkit every 2 days. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Ohms Law Calc. | Data Center Engineer Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.3K ratings)](https://appshunter.io/ios/app/ohms-law-calc/id491898006/reviews)** | — |
| Number of ratings | **1.3K** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 59 MB | 1 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) |

## What reviewers say

### Ohms Law Calc.

[App page](https://appshunter.io/ios/app/ohms-law-calc/id491898006)

This app provides a comprehensive suite of electrical calculations, including Ohm's Law, voltage drop, wire sizing, and impedance. It also offers numerous converters for various electrical units and parameters, aiding in circuit design and analysis.

**Highlights:** Ohm's Law calculations, Voltage drop calculator, Wire size calculator, Impedance calculations (R, L, C), Electrical unit converters, Power and current conversions, Circuit design tools

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ohms Law Calc. | $3.99 | one-time |

**What reviewers like**

- 🚀 Great value
- 🚀 Works perfectly
- 🚀 Fantastic app
- 👍 Best thing since sliced bread
- 🚀 Useful for electrical work

**What reviewers complain about**

- 👎 Have to pay again for an app already purchased
- 👎 Not easy to use
- 🐛 Paid but not unlocked, no response from developer
- 👎 Annoying pop-ups
- 🐛 Keeps shutting down

**Reported bugs**

- Paid version not unlocking
- Repeatedly prompting for payment after already paid
- Keyboard overlaying results making it difficult to see

**Requested features**

- Add more electrical conversions and calculations
- Add ability to input voltage and resistance to get amps and watts
- Add kVA, rms, and other popular needed conversions


### Data Center Engineer Toolkit

[App page](https://appshunter.io/ios/app/data-center-engineer-toolkit/id6761987963)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Calculators | $12.99 | one-time |


## Frequently asked questions

### Is Ohms Law Calc. free?

Ohms Law Calc. is free to download, with in-app purchases available.

### Is Data Center Engineer Toolkit free?

Data Center Engineer Toolkit is free to download, with in-app purchases available.

### Do Ohms Law Calc. or Data Center Engineer Toolkit have ads?

Ohms Law Calc. shows ads; Data Center Engineer Toolkit does not.

### Which is updated more often, Ohms Law Calc. or Data Center Engineer Toolkit?

Ohms Law Calc. ships an update every 2 months, and Data Center Engineer Toolkit every 2 days. Most recently, Ohms Law Calc. was updated on October 14, 2026 and Data Center Engineer Toolkit on October 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*