# Ruler∘ vs Zelo

The clearest difference is update cadence: Ruler∘ at every 2 weeks against Zelo's every 2 months. Zelo's advantage is iOS requirement (11.0 vs 17.0). On price, ads, 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.

Ruler∘ ships an update every 2 weeks, Zelo every 2 months. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Ruler∘ | Zelo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (44 ratings)](https://appshunter.io/ios/app/ruler/id1503532937/reviews)** | — |
| Number of ratings | **44** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 44 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrei Shpileuski](https://appshunter.io/developer/1471178734) | [FYI, Lda.](https://appshunter.io/developer/556528608) |

## What reviewers say

### Ruler∘

[App page](https://appshunter.io/ios/app/ruler/id1503532937)

This app uses augmented reality to measure distances, lengths, heights, and angles with your device's camera. It offers various modes for accurate measurements on different surfaces and for small objects. Users can save their measurements directly to their camera roll.

**Highlights:** Augmented reality measurements, Measure distance, length, height, area, angles, Point and shoot measurement, Air Mode for linear measurement, Surface Locked for planes, Save measures to Camera Roll

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

**In-app purchases:** none


### Zelo

[App page](https://appshunter.io/ios/app/zelo/id1518958158)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ruler∘ free?

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

### Is Zelo free?

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

### Do Ruler∘ or Zelo have ads?

Neither Ruler∘ nor Zelo shows ads.

### Which is updated more often, Ruler∘ or Zelo?

Ruler∘ ships an update every 2 weeks, and Zelo every 2 months. Most recently, Ruler∘ was updated on October 3, 2026 and Zelo on October 9, 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.*