LunaSolCal vs Blue Sentry
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LunaSolCal
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.
- 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
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Calculate times of sunrise, sunset, moonrise, moonset and more for your location at any given date. The following data is calculated: - Sunrise - Solar noon - Sunset - Day length - Equation of time - Declination - Civil twilight (Dawn/Dusk) - Nautical twilight (Dawn/Dusk) - Astronomical twilight (Dawn/Dusk) - Azimuth at sunrise and sunset - Altitude during solar noon - Sun track - Date and time of Seasons (Spring, Summer, Fall, Winter) - Solstice and Equinox dates - Date and time of next solar eclipse - Moonrise - Moon transit - Moonset - Moon phase - Distance - Declination - Date and time of next new moon - Date and time of next full moon - Azimuth at moonrise and moonset - Altitude during moon transit - Moon track - Date and time of next lunar eclipse Some information for the current day can also be viewed in the notification center. To specify the location of interest either get the position from the built-in GPS or Wifi receiver or select a city from a database with over 400,000 cities in over 200 countries.
Blue Sentry
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Blue Sentry connects your phone to Elbis Bluetooth sensors so you can easily monitor and manage your devices. - Scan for nearby sensors - View measurements in real time - Configure your sensors - Export logs in PDF or CSV Thanks to Bluetooth Low Energy (BLE) technology, your sensors are extremely power efficient — with battery life of up to 3 years, depending on configuration and battery type. Stay connected. Stay in control. Blue Sentry makes sensor monitoring simple.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | LunaSolCal | Blue Sentry |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.9 (1.2K ratings) — better | — |
| Positive reviews | 95.5% of reviews | — |
| Number of ratings | 1.2K — better | — |
| Update frequency | Every 2 months — better | Every 23 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 64 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Volker Voecking Software Engineering | Elbis |
Bugs and requests
LunaSolCal
Reported bugs
2 issues- Notifications not working properly
- Crashes when using map layer select
Requested features
3 requests- Add lockscreen widget
- Implement automatic light/dark mode switching
- Integrate with calendar for event planning
Blue Sentry
Not enough reviews yet to summarise bugs or requests.
In-app purchases
LunaSolCal
No in-app purchases
Blue Sentry
No in-app purchases
