# Hz Frequency by Lamda vs SadBox

The clearest difference is update cadence: Hz Frequency by Lamda at every 9 days against SadBox's every 4 weeks. Hz Frequency by Lamda also leads on iOS requirement (14.0.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Hz Frequency by Lamda sells 5 in-app purchases, starting at $4.99 per month and SadBox sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Hz Frequency by Lamda ships an update every 9 days, SadBox every 4 weeks. The most recent releases landed on July 4, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Hz Frequency by Lamda | SadBox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (19 ratings)](https://appshunter.io/ios/app/hz-frequency-by-lamda/id6747421302/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 4 weeks |
| Monetization | Freemium | — |
| Size | 168 MB | 14 MB |
| Requires iOS | **14.0.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jehan Radwan](https://appshunter.io/developer/1820159651) | [俊辰 黎](https://appshunter.io/developer/1813083979) |

## What reviewers say

### Hz Frequency by Lamda

[App page](https://appshunter.io/ios/app/hz-frequency-by-lamda/id6747421302)

This app offers precision Hz frequency soundscapes designed to promote inner harmony, clarity, and calm. It features binaural beats and various admired frequencies embedded in relaxing music, with interactive visual meditations to support stress relief and sleep.

**Highlights:** Precision Hz frequency programs, Binaural Beats, Interactive 3D scenes, Includes 432 Hz, 528 Hz, and solfeggio frequencies, Stress relief and relaxation support, Short interactive exercises

**Features:** Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $4.99 | per month |
| Monthly Premium Standard | $8.99 | per month |
| Annual | $19.99 | per year |
| Annual Premium | $44.00 | per year |
| Lifetime | $110.99 | one-time |


### SadBox

[App page](https://appshunter.io/ios/app/sadbox/id6749219213)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $1.99 | per month |
| Quarterly Membership | $4.99 | per 3 months |
| Annual Membership | $8.99 | per year |
| Lifetime Membership | $12.99 | one-time |


## Frequently asked questions

### Is Hz Frequency by Lamda free?

Hz Frequency by Lamda is free to download, with in-app purchases available.

### Is SadBox free?

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

### Do Hz Frequency by Lamda or SadBox have ads?

Neither Hz Frequency by Lamda nor SadBox shows ads.

### Which is updated more often, Hz Frequency by Lamda or SadBox?

Hz Frequency by Lamda ships an update every 9 days, and SadBox every 4 weeks. Most recently, Hz Frequency by Lamda was updated on July 4, 2026 and SadBox on September 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.*