# LunaSolCal vs Blue Sentry

The clearest difference is price: Blue Sentry at Free against LunaSolCal's $4.99. Blue Sentry also leads on iOS requirement (13.0 vs 17.0). LunaSolCal's advantage is update cadence (every 2 months vs every 23 months). On ads, in-app purchases and device support there is nothing between them.

Blue Sentry is free to download; LunaSolCal costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LunaSolCal ships an update every 2 months, Blue Sentry every 23 months. The most recent releases landed on October 23, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | LunaSolCal | Blue Sentry |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.9 (1.2K ratings)](https://appshunter.io/ios/app/lunasolcal/id390175338/reviews)** | — |
| Number of ratings | **1.2K** | — |
| Positive reviews | 95.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 23 months |
| Monetization | Free | — |
| Size | 64 MB | 33 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Volker Voecking Software Engineering](https://appshunter.io/developer/390175341) | [Elbis](https://appshunter.io/developer/1455228882) |

## What reviewers say

### LunaSolCal

[App page](https://appshunter.io/ios/app/lunasolcal/id390175338)

This app calculates precise times for sun and moon events, including sunrise, sunset, moonrise, and moonset, for any location and date. It also provides detailed astronomical data and tracks celestial movements. View daily information in the notification center.

**Highlights:** Sunrise and sunset times, Moonrise and moonset times, Day length calculation, Moon phase tracking, Twilight times (civil, nautical, astronomical), Solar and lunar eclipse dates, Location-based calculations via GPS or city database

**In-app purchases:** none

**What reviewers like**

- 👍 Great app
- 🚀 Accurate and reliable information
- 💡 Useful for photography and planning
- 👍 Easy to use and navigate
- 👍 Comprehensive data and features

**What reviewers complain about**

- 🐛 Notifications/alarms not working consistently
- 🐛 Occasional crashes or bugs
- 🔧 Place/location selection could be improved

**Reported bugs**

- Notifications not working properly
- Crashes when using map layer select

**Requested features**

- Add lockscreen widget
- Implement automatic light/dark mode switching
- Integrate with calendar for event planning


### Blue Sentry

[App page](https://appshunter.io/ios/app/blue-sentry/id1599079697)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LunaSolCal free?

LunaSolCal costs $4.99, with no in-app purchases.

### Is Blue Sentry free?

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

### Do LunaSolCal or Blue Sentry have ads?

Neither LunaSolCal nor Blue Sentry shows ads.

### Which is updated more often, LunaSolCal or Blue Sentry?

LunaSolCal ships an update every 2 months, and Blue Sentry every 23 months. Most recently, LunaSolCal was updated on October 23, 2026 and Blue Sentry on October 7, 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.*