# Lambda vs Metal Detector 3D Plus

The clearest difference is iOS requirement: Metal Detector 3D Plus at 13.0 against Lambda's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Lambda costs $2.99 and Metal Detector 3D Plus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Lambda ships an update every 54 months, Metal Detector 3D Plus every 38 months. Both last shipped on October 4, 2026.

## The numbers

| Metric | Lambda | Metal Detector 3D Plus |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lambda/id434581690/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 54 months | **Every 38 months** |
| Monetization | Paid | — |
| Size | 6 MB | 2 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [dgApps](https://appshunter.io/developer/357488432) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Lambda

[App page](https://appshunter.io/ios/app/lambda/id434581690)

This app helps musicians and sound engineers convert between musical notes, frequencies, and wavelengths. It features a dynamic fader, built-in oscillator, and frequency tracker with waveform display. Customize tuning standards and speed of sound for precise audio analysis.

**Highlights:** Convert notes, frequencies, wavelengths, Dynamic fader for real-time adjustment, Built-in oscillator with waveform, Frequency tracker with waveform, Customizable tuning standards, Adjustable speed of sound, Share data via standard methods

**In-app purchases:** none


### Metal Detector 3D Plus

[App page](https://appshunter.io/ios/app/metal-detector-3d-plus/id1619596809)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Lambda free?

Lambda costs $2.99, with no in-app purchases.

### Is Metal Detector 3D Plus free?

Metal Detector 3D Plus costs $2.99, with no in-app purchases.

### Do Lambda or Metal Detector 3D Plus have ads?

Neither Lambda nor Metal Detector 3D Plus shows ads.

### Which is updated more often, Lambda or Metal Detector 3D Plus?

Lambda ships an update every 54 months, and Metal Detector 3D Plus every 38 months. Most recently, Lambda was updated on October 4, 2026 and Metal Detector 3D Plus on October 4, 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.*