# Unsent Letters vs AmbientWave

The clearest difference is in-app purchases: AmbientWave at none against Unsent Letters's 3. AmbientWave also leads on iOS requirement (15.0 vs 18.5). Unsent Letters's advantage is update cadence (every 2 days vs every 5 days). On price, ads and device support there is nothing between them.

Both are free to download. Unsent Letters sells 3 in-app purchases, starting at $3.99 per month. AmbientWave asks for nothing beyond the download.

Unsent Letters ships an update every 2 days, AmbientWave every 5 days. The most recent releases landed on September 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Unsent Letters | AmbientWave |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ambientwave/id6756723341/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 5 days |
| Monetization | — | Freemium |
| Size | 58 MB | 285 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Raul Muresan](https://appshunter.io/developer/1805587360) | [Paul Crowley](https://appshunter.io/developer/1862512679) |

## What reviewers say

### Unsent Letters

[App page](https://appshunter.io/ios/app/unsent-letters/id6748039152)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $3.99 | per month |
| Premium Yearly | $8.99 | per year |
| Lifetime Premium | $12.99 | one-time |


### AmbientWave

[App page](https://appshunter.io/ios/app/ambientwave/id6756723341)

Create personalized ambient soundscapes for focus, relaxation, or sleep. Mix various environmental sounds like rain, wind, and ocean with individual volume controls for a seamless listening experience.

**Highlights:** Mix multiple ambient sounds, Continuous loop playback, Individual sound volume control, Unlockable sound variations (Pro), White/Pink/Brown noise (Pro), Sleep timer (Pro)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Unsent Letters free?

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

### Is AmbientWave free?

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

### Do Unsent Letters or AmbientWave have ads?

Neither Unsent Letters nor AmbientWave shows ads.

### Which is updated more often, Unsent Letters or AmbientWave?

Unsent Letters ships an update every 2 days, and AmbientWave every 5 days. Most recently, Unsent Letters was updated on September 8, 2026 and AmbientWave on September 10, 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.*