# BenchKit vs OhmNote

The clearest difference is in-app purchases: BenchKit at none against OhmNote's 3. OhmNote's advantage is update cadence (weekly vs every 2 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. OhmNote sells 3 in-app purchases, starting at $2.99 per month. BenchKit asks for nothing beyond the download.

BenchKit ships an update every 2 months, OhmNote weekly. Both last shipped on October 31, 2026.

## The numbers

| Metric | BenchKit | OhmNote |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ohmnote-electronics-tube-amp/id6799597672/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 29 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [明 齐](https://appshunter.io/developer/6775941194) | [Sang Truong](https://appshunter.io/developer/6799597675) |

## What reviewers say

### BenchKit

[App page](https://appshunter.io/ios/app/benchkit-electronics-tools/id6794949007)

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

**In-app purchases:** none


### OhmNote

[App page](https://appshunter.io/ios/app/ohmnote-electronics-tube-amp/id6799597672)

This app provides a comprehensive suite of electronics calculators, specializing in vacuum tube amplifiers and transformer design. It offers tools for everyday electronics calculations, tube analysis, and magnetic component design, all working offline without ads.

**Highlights:** Vacuum tube analysis and design tools, Transformer and magnetic component calculators, Extensive tube database and pinouts, Resistor color code and capacitor decoder, Ohm's law and power calculations, Offline functionality, Multiple language support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hàng tháng | $2.99 | per month |
| Hàng năm | $14.99 | per year |
| Gói trọn đời | $39.99 | one-time |


## Frequently asked questions

### Is BenchKit free?

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

### Is OhmNote free?

OhmNote is free to download, with in-app purchases available.

### Do BenchKit or OhmNote have ads?

Neither BenchKit nor OhmNote shows ads.

### Which is updated more often, BenchKit or OhmNote?

BenchKit ships an update every 2 months, and OhmNote weekly. Most recently, BenchKit was updated on October 31, 2026 and OhmNote on October 31, 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.*