# Sun Alarm Clock vs Grandpa Notes

The clearest difference is in-app purchases: Grandpa Notes at none against Sun Alarm Clock's 3. Grandpa Notes also leads on iOS requirement (17.0 vs 26.1). Sun Alarm Clock's advantage is update cadence (every 3 months vs every 20 months). On price, ads and device support there is nothing between them.

Both are free to download. Sun Alarm Clock sells 3 in-app purchases, starting at $0.99 per month. Grandpa Notes asks for nothing beyond the download.

Sun Alarm Clock ships an update every 3 months, Grandpa Notes every 20 months. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Sun Alarm Clock | Grandpa Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (27 ratings)](https://appshunter.io/ios/app/sun-alarm-clock/id1556630551/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 20 months |
| Monetization | Freemium | — |
| Size | 34 MB | 3 MB |
| Requires iOS | 26.1 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Volker Voecking Software Engineering](https://appshunter.io/developer/390175341) | [Julien Eyriès](https://appshunter.io/developer/414653864) |

## What reviewers say

### Sun Alarm Clock

[App page](https://appshunter.io/ios/app/sun-alarm-clock/id1556630551)

Wake up to natural celestial events. This app sets alarms for sunrise, sunset, moon phases, and twilight periods, adapting to your location and daylight saving changes. Customize offsets and manage multiple alarms easily.

**Highlights:** Alarms for sunrise and sunset, Moonrise and moonset alarms, Twilight and golden hour alerts, Customizable offsets, Location-aware timing, Supports multiple alarms

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) | $0.99 | per month |
| Premium (Yearly) | $9.99 | per year |
| Premium (One-Time Purchase) | $29.99 | one-time |


### Grandpa Notes

[App page](https://appshunter.io/ios/app/grandpa-notes/id1643176779)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sun Alarm Clock free?

Sun Alarm Clock is free to download, with in-app purchases available.

### Is Grandpa Notes free?

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

### Do Sun Alarm Clock or Grandpa Notes have ads?

Neither Sun Alarm Clock nor Grandpa Notes shows ads.

### Which is updated more often, Sun Alarm Clock or Grandpa Notes?

Sun Alarm Clock ships an update every 3 months, and Grandpa Notes every 20 months. Most recently, Sun Alarm Clock was updated on October 24, 2026 and Grandpa Notes on October 30, 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.*