# Synapse vs Ruler

The clearest difference is in-app purchases: Synapse at none against Ruler's 2. Synapse also leads on device support (3 vs 1) and iOS requirement (12.1 vs 16.0). Ruler's advantage is update cadence (every 6 days vs every 7 months). On price and ads there is nothing between them.

Both are free to download. Ruler sells 2 in-app purchases, starting at $4.99 per 7 days. Synapse asks for nothing beyond the download.

Synapse ships an update every 7 months, Ruler every 6 days. The most recent releases landed on October 10, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Synapse | Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (36 ratings)](https://appshunter.io/ios/app/ruler-measuring-tape/id6752295073/reviews)** |
| Number of ratings | — | **36** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 6 days** |
| Monetization | — | Free with in-app purchases |
| Size | 78 MB | 108 MB |
| Requires iOS | **12.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Zinc Digital](https://appshunter.io/developer/1147605401) | [URVO PIIRISILD](https://appshunter.io/developer/1840348316) |

## What reviewers say

### Synapse

[App page](https://appshunter.io/ios/app/synapse-graff/id1567939772)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ruler

[App page](https://appshunter.io/ios/app/ruler-measuring-tape/id6752295073)

Transform your phone into a precise measuring tool for any task. Accurately measure small objects on your screen or larger items using augmented reality. Save your measurements and switch between units effortlessly.

**Highlights:** Dual measurement modes (screen/AR), Supports inches, centimeters, millimeters, Fast and accurate results, Measurement history saving, Intuitive user interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ruler – Measure Tool | $4.99 | per 7 days |
| Ruler – Measure Tool | $19.99 | per year |


## Frequently asked questions

### Is Synapse free?

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

### Is Ruler free?

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

### Do Synapse or Ruler have ads?

Neither Synapse nor Ruler shows ads.

### Which is updated more often, Synapse or Ruler?

Synapse ships an update every 7 months, and Ruler every 6 days. Most recently, Synapse was updated on October 10, 2026 and Ruler on October 15, 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.*