# ArcAir vs D

The clearest difference is in-app purchases: D at none against ArcAir's 2. D also leads on update cadence (every 5 weeks vs every 5 months). ArcAir's advantage is iOS requirement (11.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. ArcAir sells 2 one-off in-app purchases. D asks for nothing beyond the download.

ArcAir ships an update every 5 months, D every 5 weeks. The most recent releases landed on September 20, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | ArcAir | D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (8 ratings)](https://appshunter.io/ios/app/arcair/id1133492319/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 21 MB | 34 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hamilton Bonaduz AG](https://appshunter.io/developer/530886485) | [PTT ICT Solutions Company Limited](https://appshunter.io/developer/459684765) |

## What reviewers say

### ArcAir

[App page](https://appshunter.io/ios/app/arcair/id1133492319)

This app facilitates the online monitoring and visualization of various sensor data for biotechnological processes. It allows wireless communication with multiple sensors simultaneously and provides central data management, reporting, and validation for sensor calibration and configuration, supporting GMP guidelines.

**Highlights:** Online sensor monitoring, Data visualization, Wireless sensor communication, Central data management, Sensor calibration validation, Paperless workflow support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ArcAir Basic Version | Free | one-time |
| ArcAir Advanced Version | $199.99 | one-time |


### D

[App page](https://appshunter.io/ios/app/d-time/id1478384600)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ArcAir free?

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

### Is D free?

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

### Do ArcAir or D have ads?

Neither ArcAir nor D shows ads.

### Which is updated more often, ArcAir or D?

ArcAir ships an update every 5 months, and D every 5 weeks. Most recently, ArcAir was updated on September 20, 2026 and D on May 16, 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.*