# Magnetic Field Calc + vs Wavelet Voice Sonogram

The clearest difference is price: Magnetic Field Calc + at $2.99 against Wavelet Voice Sonogram's $6.99. Magnetic Field Calc + also leads on device support (3 vs 1) and iOS requirement (17.6 vs 26.2). Wavelet Voice Sonogram's advantage is update cadence (every 8 months vs every 27 months). On ads and in-app purchases there is nothing between them.

Magnetic Field Calc + costs $2.99 and Wavelet Voice Sonogram $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Magnetic Field Calc + ships an update every 27 months, Wavelet Voice Sonogram every 8 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Magnetic Field Calc + | Wavelet Voice Sonogram |
| --- | --- | --- |
| Price | **$2.99** | $6.99 |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/magnetic-field-calc-plus/id1423005752/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 8 months** |
| Monetization | Paid | — |
| Size | 1 MB | 0 MB |
| Requires iOS | **17.6** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [TOON,LLC](https://appshunter.io/developer/633948723) |

## What reviewers say

### Magnetic Field Calc +

[App page](https://appshunter.io/ios/app/magnetic-field-calc-plus/id1423005752)

Calculate magnetic fields from electric currents with four distinct modes. Solve for any variable, visualize with interactive diagrams, and utilize flexible unit support. Works offline for convenience.

**Highlights:** Four calculation modes (Straight Wire, Loop, Solenoid, Toroid), Solve for any variable (field, current, distance, etc.), Interactive 2D diagrams, Flexible unit support (A, mA, m, cm, mm, T, µT, Gauss), Built-in reference sheet, Save and copy calculations, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### Wavelet Voice Sonogram

[App page](https://appshunter.io/ios/app/wavelet-voice-sonogram/id1574131130)

**In-app purchases:** none


## Frequently asked questions

### Is Magnetic Field Calc + free?

Magnetic Field Calc + costs $2.99, with no in-app purchases.

### Is Wavelet Voice Sonogram free?

Wavelet Voice Sonogram costs $6.99, with no in-app purchases.

### Do Magnetic Field Calc + or Wavelet Voice Sonogram have ads?

Neither Magnetic Field Calc + nor Wavelet Voice Sonogram shows ads.

### Which is updated more often, Magnetic Field Calc + or Wavelet Voice Sonogram?

Magnetic Field Calc + ships an update every 27 months, and Wavelet Voice Sonogram every 8 months. Most recently, Magnetic Field Calc + was updated on November 2, 2026 and Wavelet Voice Sonogram on November 7, 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.*