# REF vs Singio

The clearest difference is in-app purchases: REF at none against Singio's 4. REF also leads on update cadence (every 3 days vs every 9 days). Singio's advantage is iOS requirement (15.6 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Singio sells 4 in-app purchases, starting at $2.99 per month. REF asks for nothing beyond the download.

REF ships an update every 3 days, Singio every 9 days. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | REF | Singio |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 9 days |
| Monetization | — | Freemium |
| Size | 6 MB | 42 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Amr Rashed](https://appshunter.io/developer/1864768976) | [UGA DOOGA LLC](https://appshunter.io/developer/1665426091) |

## What reviewers say

### REF

[App page](https://appshunter.io/ios/app/ref-440-tuner/id6757130720)

**Features:** macOS Compatibility

**In-app purchases:** none


### Singio

[App page](https://appshunter.io/ios/app/singio-vocal-phrase-trainer/id6757701802)

Transform song phrases into vocal warm-ups. Practice melodies, adjust tempo and key, and train riffs and runs. Create custom exercises or use the built-in library for singers of all levels.

**Highlights:** Vocal warm-ups in any key and tempo, Custom singing exercise creation, Built-in vocal exercise library, Riffs and runs training, Practice song fragments, Improve pitch and intonation

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Singio Premium – Monthly | $2.99 | per month |
| Singio Pro — Monthly | $6.99 | per month |
| Singio Premium — Annual | $25.49 | per year |
| Singio Pro — Annual | $58.90 | per year |


## Frequently asked questions

### Is REF free?

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

### Is Singio free?

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

### Do REF or Singio have ads?

Neither REF nor Singio shows ads.

### Which is updated more often, REF or Singio?

REF ships an update every 3 days, and Singio every 9 days. Most recently, REF was updated on October 5, 2026 and Singio on October 8, 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.*