# Klarstein vs Custos

The clearest difference is iOS requirement: Klarstein at 13.0 against Custos's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Klarstein ships an update monthly, Custos every 3 weeks. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Klarstein | Custos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (29 ratings)](https://appshunter.io/ios/app/klarstein/id1479571307/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 52.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 243 MB | 25 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, Mac, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Chal-Tec GmbH](https://appshunter.io/developer/1300080322) | [Henri Dominique Rapin](https://appshunter.io/developer/6796402184) |

## What reviewers say

### Klarstein

[App page](https://appshunter.io/ios/app/klarstein/id1479571307)

Control and monitor your smart home devices remotely from anywhere in the world. Organize devices by room, track real-time temperature and humidity, and access guides to learn app features. Stay updated on sales and connect with customer support.

**Highlights:** Remote device control, Real-time monitoring, Room organization, Temperature and humidity tracking, In-app guides, Sales information

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy setup and use
- 📱 Remote control via app
- 🗣️ Alexa and voice assistant integration
- 💡 Scene and automation creation
- 🏠 Home network integration

**What reviewers complain about**

- 🐛 Frequent bugs and glitches
- 📉 Unreliable scheduling
- ❌ App crashes and freezes
- ⚠️ Random resets of settings
- 🔌 Connection issues

**Reported bugs**

- App crashes after update
- Schedules ignored or reset randomly
- Devices turn on/off randomly
- Temperature settings are random
- App does not work after update

**Requested features**

- Dark mode
- Power consumption monitoring
- Siri/HomeKit integration
- Ability to select multiple devices for scenes
- Remove sound on radiator


### Custos

[App page](https://appshunter.io/ios/app/custos-subscription-tracker/id6798195955)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Klarstein free?

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

### Is Custos free?

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

### Do Klarstein or Custos have ads?

Neither Klarstein nor Custos shows ads.

### Which is updated more often, Klarstein or Custos?

Klarstein ships an update monthly, and Custos every 3 weeks. Most recently, Klarstein was updated on October 15, 2026 and Custos on October 6, 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.*