# OPAS Calendar vs Skein

The clearest difference is in-app purchases: OPAS Calendar at none against Skein's 2. OPAS Calendar also leads on iOS requirement (11.0 vs 17.0). Skein's advantage is update cadence (weekly vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Skein sells 2 in-app purchases, starting at $7.99 per month. OPAS Calendar asks for nothing beyond the download.

OPAS Calendar ships an update monthly, Skein weekly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | OPAS Calendar | Skein |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.7 (7 ratings)](https://appshunter.io/ios/app/opas-calendar/id898227192/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free | — |
| Size | 9 MB | 4 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [OPAS Software GmbH](https://appshunter.io/developer/1704978541) | [Nice People Collective LLC](https://appshunter.io/developer/1889269940) |

## What reviewers say

### OPAS Calendar

[App page](https://appshunter.io/ios/app/opas-calendar/id898227192)

This application syncs with the OPAS online system to display your orchestra planning and administration dates on your mobile device. It requires an existing OPAS software license and online access to function.

**Highlights:** View OPAS dates on mobile, Syncs with OPAS online system, Requires OPAS software, Orchestra planning tool

**Features:** macOS Compatibility

**In-app purchases:** none


### Skein

[App page](https://appshunter.io/ios/app/skein-knitting-pattern-design/id6780070426)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Designer Pro | $7.99 | per month |
| Designer Pro Annual | $59.99 | per year |


## Frequently asked questions

### Is OPAS Calendar free?

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

### Is Skein free?

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

### Do OPAS Calendar or Skein have ads?

Neither OPAS Calendar nor Skein shows ads.

### Which is updated more often, OPAS Calendar or Skein?

OPAS Calendar ships an update monthly, and Skein weekly. Most recently, OPAS Calendar was updated on November 1, 2026 and Skein on October 31, 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.*