# 100cm Ruler vs Vowly

The clearest difference is update cadence: Vowly at every 2 days against 100cm Ruler's every 3 months. 100cm Ruler's advantage is iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 100cm Ruler sells 1 one-off in-app purchase and Vowly sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

100cm Ruler ships an update every 3 months, Vowly every 2 days. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 100cm Ruler | Vowly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/100cm-ruler/id982815744/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 45.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 62 MB | 1 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ZOOMO Inc.](https://appshunter.io/developer/490112424) | [Jhomar Maravillas](https://appshunter.io/developer/6783703541) |

## What reviewers say

### 100cm Ruler

[App page](https://appshunter.io/ios/app/100cm-ruler/id982815744)

This app provides a digital ruler for measuring the length and diameter of small objects directly on your device. It features a millimeter scale and allows for easy sliding to measure.

**Highlights:** Digital ruler functionality, Millimeter scale, Diameter measurement, Screen sliding for measurement, Ad removal option

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ADS | $1.99 | one-time |


### Vowly

[App page](https://appshunter.io/ios/app/vowly-wedding-program/id6792488572)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Unlimited | $4.99 | one-time |


## Frequently asked questions

### Is 100cm Ruler free?

100cm Ruler is free to download, with in-app purchases available.

### Is Vowly free?

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

### Do 100cm Ruler or Vowly have ads?

Neither 100cm Ruler nor Vowly shows ads.

### Which is updated more often, 100cm Ruler or Vowly?

100cm Ruler ships an update every 3 months, and Vowly every 2 days. Most recently, 100cm Ruler was updated on October 5, 2026 and Vowly on October 11, 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.*