# Solstice vs Köln

The clearest difference is in-app purchases: Köln at none against Solstice's 3. Köln also leads on update cadence (every 2 days vs every 2 months). Solstice's advantage is device support (5 vs 2). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Solstice sells 3 one-off in-app purchases. Köln asks for nothing beyond the download.

Solstice ships an update every 2 months, Köln every 2 days. The most recent releases landed on November 7, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Solstice | Köln |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (82 ratings)](https://appshunter.io/ios/app/solstice/id1547580907/reviews)** | — |
| Number of ratings | **82** | — |
| Positive reviews | 85.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 27 MB | 13 MB |
| Requires iOS | 18.5 | **18.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch, Vision Pro** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Dan Eden](https://appshunter.io/developer/508167369) | [Frank Heinrich-von der Bank](https://appshunter.io/developer/1460674718) |

## What reviewers say

### Solstice

[App page](https://appshunter.io/ios/app/solstice/id1547580907)

Track daily daylight changes in your location and see monthly projections. Explore daylight variations across different global locations and over time. Receive notifications and use widgets to stay informed about upcoming daylight.

**Highlights:** Daily daylight change comparison, Monthly daylight projections, Time Travel feature, Multi-location comparison, Daily notifications, Widgets

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Medium Tip | $5.99 | one-time |
| Large Tip | $11.99 | one-time |

**What reviewers like**

- ✨ Beautiful and clean design
- 👍 Simple and easy to use
- 💡 Informative and detailed data
- 🚀 Fast and seamless performance
- 🎁 Free and privacy-respecting

**What reviewers complain about**

- 🐛 App crashes frequently
- 🐛 Widgets not displaying correctly
- 🐛 Notifications not sending
- 🐛 Inaccurate information (longest/shortest days inverted)
- 🐛 App hangs on cold open

**Reported bugs**

- App crashes when sliding bar
- App crashes when holding any location
- Square widget displays white square with grey bars only
- Widget options not showing
- Lock screen widget progress ring shows incorrect progress

**Requested features**

- Add a month view
- Add equinox measurements and widgets
- Remember multiple locations
- Compare data for two places on the same screen
- Add automatic push notifications for sunset


### Köln

[App page](https://appshunter.io/ios/app/koln-wetter-watch/id6793095739)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Solstice free?

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

### Is Köln free?

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

### Do Solstice or Köln have ads?

Neither Solstice nor Köln shows ads.

### Which is updated more often, Solstice or Köln?

Solstice ships an update every 2 months, and Köln every 2 days. Most recently, Solstice was updated on November 7, 2026 and Köln on November 10, 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.*