# Time Tracker by ARS vs OIO Circadian

The clearest difference is rating: Time Tracker by ARS at 5.0 against OIO Circadian's 2.5. Time Tracker by ARS also leads on device support (3 vs 1) and iOS requirement (10.1 vs 17.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

Time Tracker by ARS holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 5 and 6 respectively.

Time Tracker by ARS ships an update every 3 weeks, OIO Circadian every 6 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Time Tracker by ARS | OIO Circadian |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/time-tracker-by-ars/id1408661531/reviews)** | [2.5 (6 ratings)](https://appshunter.io/ios/app/oio-circadian/id6739509200/reviews) |
| Number of ratings | 5 | **6** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 51 MB | 105 MB |
| Requires iOS | **10.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Advanced Radiology Services, PC](https://appshunter.io/developer/466357254) | [KORRUS, INC](https://appshunter.io/developer/1639435894) |

## What reviewers say

### Time Tracker by ARS

[App page](https://appshunter.io/ios/app/time-tracker-by-ars/id1408661531)

This app assists physicians and APPs in meticulously tracking and documenting their work hours for RVU calculations. It offers offline time entry with secure server synchronization for data storage. Contact Advanced Radiology Services PC to begin using this tool.

**Highlights:** Time tracking for RVU purposes, Offline time entry, Secure server synchronization, Data documentation, Physician and APP focused

**Features:** macOS Compatibility

**In-app purchases:** none


### OIO Circadian

[App page](https://appshunter.io/ios/app/oio-circadian/id6739509200)

This app visualizes your light exposure throughout the day, offering personalized schedules to improve sleep and energy. Control smart lighting scenes and individual rooms for whole-home wellness lighting.

**Highlights:** Spectral Display for light wavelengths, Personalized circadian lighting schedules, Instant smart lighting scene control, Individual room lighting adjustment, Whole-home lighting management, Easy bulb setup and room grouping

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

**In-app purchases:** none


## Frequently asked questions

### Is Time Tracker by ARS free?

Time Tracker by ARS is free to download, with no in-app purchases.

### Is OIO Circadian free?

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

### Which has better reviews, Time Tracker by ARS or OIO Circadian?

Time Tracker by ARS is rated higher. Time Tracker by ARS averages 5.0 out of 5 from 5 ratings, while OIO Circadian averages 2.5 from 6 ratings.

### Do Time Tracker by ARS or OIO Circadian have ads?

Neither Time Tracker by ARS nor OIO Circadian shows ads.

### Which is updated more often, Time Tracker by ARS or OIO Circadian?

Time Tracker by ARS ships an update every 3 weeks, and OIO Circadian every 6 weeks. Most recently, Time Tracker by ARS was updated on November 2, 2026 and OIO Circadian on November 4, 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.*