# Unit Converter ( Calculator ) vs S PayNote

The clearest difference is ads: S PayNote at none against Unit Converter ( Calculator )'s shown. Unit Converter ( Calculator )'s advantage is iOS requirement (13.0 vs 17.6). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Unit Converter ( Calculator ) ships an update monthly, S PayNote every 2 weeks. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Unit Converter ( Calculator ) | S PayNote |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (129 ratings)](https://appshunter.io/ios/app/unit-converter-calculator/id904830056/reviews)** | — |
| Number of ratings | **129** | — |
| Positive reviews | 34.6% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Ad-supported | — |
| Size | 6 MB | 4 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [EONSOFT](https://appshunter.io/developer/899851112) | [Byung-woo Hwang](https://appshunter.io/developer/1867186958) |

## What reviewers say

### Unit Converter ( Calculator )

[App page](https://appshunter.io/ios/app/unit-converter-calculator/id904830056)

Easily convert between various units of measurement for length, weight, volume, temperature, and more. This tool simplifies calculations for everyday needs and specific applications.

**Highlights:** Length conversion, Weight conversion, Volume conversion, Temperature conversion, Pressure conversion, Velocity conversion

**Features:** Vision Pro support

**In-app purchases:** none


### S PayNote

[App page](https://appshunter.io/ios/app/s-paynote/id6761880147)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter ( Calculator ) free?

Unit Converter ( Calculator ) is free to download, with no in-app purchases.

### Is S PayNote free?

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

### Do Unit Converter ( Calculator ) or S PayNote have ads?

Unit Converter ( Calculator ) shows ads; S PayNote does not.

### Which is updated more often, Unit Converter ( Calculator ) or S PayNote?

Unit Converter ( Calculator ) ships an update monthly, and S PayNote every 2 weeks. Most recently, Unit Converter ( Calculator ) was updated on October 13, 2026 and S PayNote 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.*