# Sálmabók vs Reverse Singing

The clearest difference is in-app purchases: Sálmabók at none against Reverse Singing's 2. Sálmabók also leads on iOS requirement (15.1 vs 17.0). Reverse Singing's advantage is update cadence (every 3 weeks vs every 71 months). On price, ads and device support there is nothing between them.

Both are free to download. Reverse Singing sells 2 in-app purchases, starting at $3.99 per 7 days. Sálmabók asks for nothing beyond the download.

Sálmabók ships an update every 71 months, Reverse Singing every 3 weeks. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sálmabók | Reverse Singing |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 71 months | **Every 3 weeks** |
| Size | 134 MB | 27 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Faroe Media](https://appshunter.io/developer/456968573) | [Eregar LTD](https://appshunter.io/developer/1644437431) |

## What reviewers say

### Sálmabók

[App page](https://appshunter.io/ios/app/salmabok/id1450115951)

**In-app purchases:** none


### Reverse Singing

[App page](https://appshunter.io/ios/app/reverse-singing-audio-battle/id6758907924)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reverse Singing Audio: Weekly | $3.99 | per 7 days |
| Reverse Singing Audio: Lifetime | $12.99 | one-time |


## Frequently asked questions

### Is Sálmabók free?

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

### Is Reverse Singing free?

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

### Do Sálmabók or Reverse Singing have ads?

Neither Sálmabók nor Reverse Singing shows ads.

### Which is updated more often, Sálmabók or Reverse Singing?

Sálmabók ships an update every 71 months, and Reverse Singing every 3 weeks. Most recently, Sálmabók was updated on October 19, 2026 and Reverse Singing on October 24, 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.*