# Parati Audio vs Ring Sizer & Ruler

The clearest difference is in-app purchases: Parati Audio at none against Ring Sizer & Ruler's 4. Parati Audio also leads on update cadence (fortnightly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Ring Sizer & Ruler sells 4 in-app purchases, starting at $9.99 per 7 days. Parati Audio asks for nothing beyond the download.

Parati Audio ships an update fortnightly, Ring Sizer & Ruler every 2 months. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Parati Audio | Ring Sizer & Ruler |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Size | 110 MB | 46 MB |
| Requires iOS | 16.6 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Rehear Audiology Company LTD](https://appshunter.io/developer/1844818154) | [VAST FLOW, TOO](https://appshunter.io/developer/1754861329) |

## What reviewers say

### Parati Audio

[App page](https://appshunter.io/ios/app/parati-audio/id6753747457)

**In-app purchases:** none


### Ring Sizer & Ruler

[App page](https://appshunter.io/ios/app/ring-sizer-and-ruler-mesurix/id6776475871)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly \| Mesurix Pro | $9.99 | per 7 days |
| Yearly \| Mesurix Pro | $39.99 | per year |
| Lifetime Access | $14.99 | one-time |
| Mesurix Pro Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Parati Audio free?

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

### Is Ring Sizer & Ruler free?

Ring Sizer & Ruler is free to download, with in-app purchases available.

### Do Parati Audio or Ring Sizer & Ruler have ads?

Neither Parati Audio nor Ring Sizer & Ruler shows ads.

### Which is updated more often, Parati Audio or Ring Sizer & Ruler?

Parati Audio ships an update fortnightly, and Ring Sizer & Ruler every 2 months. Most recently, Parati Audio was updated on October 30, 2026 and Ring Sizer & Ruler on October 28, 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.*