# Frequency Sound Wave Generator vs Engine Builder Pro

The clearest difference is in-app purchases: Engine Builder Pro at none against Frequency Sound Wave Generator's 3. Engine Builder Pro also leads on ads (none vs shown) and update cadence (every 2 days vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Frequency Sound Wave Generator sells 3 in-app purchases, starting at $1.99 per month. Engine Builder Pro asks for nothing beyond the download.

Frequency Sound Wave Generator ships an update monthly, Engine Builder Pro every 2 days. The most recent releases landed on October 30, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Frequency Sound Wave Generator | Engine Builder Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (94 ratings)](https://appshunter.io/ios/app/frequency-sound-wave-generator/id6478711398/reviews)** | — |
| Number of ratings | **94** | — |
| Positive reviews | 90.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 169 MB | 22 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David Krejci](https://appshunter.io/developer/1737377675) | [Gemma Beames](https://appshunter.io/developer/6811020787) |

## What reviewers say

### Frequency Sound Wave Generator

[App page](https://appshunter.io/ios/app/frequency-sound-wave-generator/id6478711398)

Generate and analyze a wide range of sounds and frequencies. Explore tone generation, sound tests, musical tuning, and create custom sound effects. Visualize sound waves and experiment with different waveforms.

**Highlights:** Single and multiple frequency generation, Musical notes presets, Binaural beats, SFX sound generator, Sweep generator, Bass/Subwoofer sound test, DTMF tones

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly PRO subscription | $1.99 | per month |
| Yearly Pro Membership | $9.99 | per year |
| Lifetime PRO membership | $19.99 | one-time |


### Engine Builder Pro

[App page](https://appshunter.io/ios/app/engine-builder-pro/id6813993112)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Frequency Sound Wave Generator free?

Frequency Sound Wave Generator is free to download, with in-app purchases available.

### Is Engine Builder Pro free?

Engine Builder Pro is free to download, with no in-app purchases.

### Do Frequency Sound Wave Generator or Engine Builder Pro have ads?

Frequency Sound Wave Generator shows ads; Engine Builder Pro does not.

### Which is updated more often, Frequency Sound Wave Generator or Engine Builder Pro?

Frequency Sound Wave Generator ships an update monthly, and Engine Builder Pro every 2 days. Most recently, Frequency Sound Wave Generator was updated on October 30, 2026 and Engine Builder Pro on October 5, 2026.

---

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