# Sirius vs Photo Ruler

The clearest difference is in-app purchases: Sirius at none against Photo Ruler's 1. Sirius also leads on iOS requirement (11.0 vs 18.0). Photo Ruler's advantage is update cadence (weekly vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. Photo Ruler sells 1 in-app purchase, starting at $6.99 per year. Sirius asks for nothing beyond the download.

Sirius ships an update every 7 months, Photo Ruler weekly. The most recent releases landed on October 19, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Sirius | Photo Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/sirius/id1658801119/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Weekly** |
| Monetization | Free | — |
| Size | 166 MB | 6 MB |
| Requires iOS | **11.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Terence Ndofor](https://appshunter.io/developer/1658801121) | [Ihar Shaduryn](https://appshunter.io/developer/988578285) |

## What reviewers say

### Sirius

[App page](https://appshunter.io/ios/app/sirius/id1658801119)

Monitor vital signs, store health history, and set up family notifications. Control smart lights and easily connect to devices. This app offers comprehensive health tracking and smart home integration.

**Highlights:** Vital sign monitoring, Health history recording, Family notifications, Smart lighting control, Easy device connection

**Features:** macOS Compatibility

**In-app purchases:** none


### Photo Ruler

[App page](https://appshunter.io/ios/app/photo-ruler-measure-objects/id6792457241)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Paper Image Meter Unlimited | $6.99 | per year |


## Frequently asked questions

### Is Sirius free?

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

### Is Photo Ruler free?

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

### Do Sirius or Photo Ruler have ads?

Neither Sirius nor Photo Ruler shows ads.

### Which is updated more often, Sirius or Photo Ruler?

Sirius ships an update every 7 months, and Photo Ruler weekly. Most recently, Sirius was updated on October 19, 2026 and Photo Ruler on October 25, 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.*