# Time Timer vs IndoorCO2Map Data Collector

The clearest difference is review sentiment: IndoorCO2Map Data Collector at 100% against Time Timer's 63%. IndoorCO2Map Data Collector also leads on in-app purchases (none vs 1) and rating (5.0 vs 4.6). Time Timer's advantage is update cadence (every 2 weeks vs every 3 months) and ratings volume (15K vs 2). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Time Timer sells 1 in-app purchase, starting at $9.95 per year. IndoorCO2Map Data Collector asks for nothing beyond the download.

IndoorCO2Map Data Collector holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Time Timer has 15K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 63% of Time Timer's written reviews are positive against 100% of IndoorCO2Map Data Collector's.

Time Timer ships an update every 2 weeks, IndoorCO2Map Data Collector every 3 months. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Time Timer | IndoorCO2Map Data Collector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (15K ratings)](https://appshunter.io/ios/app/time-timer/id332520417/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/indoorco2map-data-collector/id6504560820/reviews)** |
| Number of ratings | **15K** | 2 |
| Positive reviews | 62.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Freemium | **Free** |
| Size | 174 MB | 101 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Time Timer LLC](https://appshunter.io/developer/332520420) | [Aurel Wuensch](https://appshunter.io/developer/1752859912) |

## What reviewers say

### Time Timer

[App page](https://appshunter.io/ios/app/time-timer/id332520417)

This app provides a visual representation of time passing, making it easier to manage tasks and routines. It's designed to be inclusive and flexible for various needs, from educational settings to personal productivity.

**Highlights:** Iconic visual timer with disappearing disk, Inclusive design for various needs, Flexible routine creation and sequencing, Multiple timers and preset options, Customizable sound, vibration, and color

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all Time Timer features | $9.95 | per year |

**What reviewers like**

- 👍 Helpful for ADHD and autism
- 🚀 Great visual timer
- 👍 Customizable timers
- 👍 Useful for presentations and meetings
- 👍 Indispensable for organization and time management

**What reviewers complain about**

- 🐛 Unreliable sound/vibration alerts
- 🐛 Inconsistent behavior when phone is locked or app is minimized
- 🐛 Occasional crashes or bugs
- 🔋 Screen turns off during timer
- 👎 Subscription model for some features

**Reported bugs**

- No timers show up in app
- Timer stops working when phone is locked
- Inconsistent dark mode implementation
- Vibration doesn't work as expected

**Requested features**

- Add Apple Watch complication
- Allow rearranging of timers
- Ability to continue timer after time is up
- Option to change timer color and background
- Lock timer settings on Apple Watch


### IndoorCO2Map Data Collector

[App page](https://appshunter.io/ios/app/indoorco2map-data-collector/id6504560820)

Contribute to a citizen science project by collecting indoor CO2 concentration data in public buildings. Use a supported CO2 sensor and this application to build a comprehensive dataset for analysis.

**Highlights:** Collect indoor CO2 concentration data, Supports Aranet, Airvalent, AirSpot, Inkbird-IAMT1 sensors, Contribute to citizen science project, Builds comprehensive indoor CO2 dataset, Data collection for non-residential buildings

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Time Timer free?

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

### Is IndoorCO2Map Data Collector free?

IndoorCO2Map Data Collector is free to download, with no in-app purchases.

### Which has better reviews, Time Timer or IndoorCO2Map Data Collector?

IndoorCO2Map Data Collector is rated higher. Time Timer averages 4.6 out of 5 from 15K ratings, while IndoorCO2Map Data Collector averages 5.0 from 2 ratings.

### Do Time Timer or IndoorCO2Map Data Collector have ads?

Neither Time Timer nor IndoorCO2Map Data Collector shows ads.

### Which is updated more often, Time Timer or IndoorCO2Map Data Collector?

Time Timer ships an update every 2 weeks, and IndoorCO2Map Data Collector every 3 months. Most recently, Time Timer was updated on October 24, 2026 and IndoorCO2Map Data Collector on October 19, 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.*