# Ohmulator vs J

The clearest difference is price: J at Free against Ohmulator's $0.99. Ohmulator's advantage is iOS requirement (10.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

J is free to download; Ohmulator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Ohmulator ships an update every 2 months, J every 3 months. The most recent releases landed on October 29, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Ohmulator | J |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.7 (79 ratings)](https://appshunter.io/ios/app/ohmulator/id398901336/reviews)** | — |
| Number of ratings | **79** | — |
| Positive reviews | 81.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free | — |
| Size | 5 MB | 30 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Armchair Engineering](https://appshunter.io/developer/398901339) | [深圳市佳士科技股份有限公司](https://appshunter.io/developer/1494882581) |

## What reviewers say

### Ohmulator

[App page](https://appshunter.io/ios/app/ohmulator/id398901336)

This electric circuit calculator simplifies Ohm's Law calculations. It allows users to input two known variables (current, resistance, voltage, or power) and automatically computes the unknown values. The app also supports on-the-fly unit adjustments, eliminating the need for manual conversions.

**Highlights:** Ohm's Law calculations, Calculate unknown variables, Adjustable unit types, Total resistance calculator, Supports Voltage, Current, Resistance, Power

**Features:** Vision Pro support

**In-app purchases:** none


### J

[App page](https://appshunter.io/ios/app/j-weld/id6469101974)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ohmulator free?

Ohmulator costs $0.99, with no in-app purchases.

### Is J free?

J is free to download, with no in-app purchases.

### Do Ohmulator or J have ads?

Neither Ohmulator nor J shows ads.

### Which is updated more often, Ohmulator or J?

Ohmulator ships an update every 2 months, and J every 3 months. Most recently, Ohmulator was updated on October 29, 2026 and J on October 14, 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.*