# Fenster vs BISS.ID

The clearest difference is update cadence: BISS.ID at every 6 weeks against Fenster's every 8 months. Fenster's advantage is iOS requirement (8.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Fenster ships an update every 8 months, BISS.ID every 6 weeks. The most recent releases landed on October 16, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Fenster | BISS.ID |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 6 weeks** |
| Size | 61 MB | 30 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Isogon Fenstersysteme GmbH](https://appshunter.io/developer/356169626) | [Syfit GmbH](https://appshunter.io/developer/1260929417) |

## What reviewers say

### Fenster

[App page](https://appshunter.io/ios/app/fenster/id455902895)

**Features:** macOS Compatibility

**In-app purchases:** none


### BISS.ID

[App page](https://appshunter.io/ios/app/bissid/id1625860189)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fenster free?

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

### Is BISS.ID free?

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

### Do Fenster or BISS.ID have ads?

Neither Fenster nor BISS.ID shows ads.

### Which is updated more often, Fenster or BISS.ID?

Fenster ships an update every 8 months, and BISS.ID every 6 weeks. Most recently, Fenster was updated on October 16, 2026 and BISS.ID on October 21, 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.*