Solar Eclipse Timer vs Sky Alerts Star Log
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Solar Eclipse Timer
This app provides precise countdowns and reminders for solar eclipse phenomena, aiding both casual observers and photographers. It works offline and offers features like automatic partial-phase image timing and a dedicated photographer mode.
- Offline eclipse timing
- Precise contact time calculation
- Photographer mode
- Automatic partial-phase image timing
- Geolocation and manual coordinate entry
- Audio and notification tests
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The Solar Eclipse Timer app is marking its 6th eclipse since 2017, which speaks volumes about its reliability and the trust it has built within the eclipse-chasing community. Helping tens of thousands of people enjoy the eclipse more by being reminded to observe all the fascinating eclipse phenomena. Photographers are aided by down-to-the-second precision and countdowns. Since the 2026 path covers some remote areas as well as high-traffic spots in Spain where cell service could be overwhelmed on eclipse day, the app works offline once unlocked. So, geolocation and contact time calculation are all done within the app. This makes it a true "field tool." The app is free to try, and for only a $1.99 in-app purchase to unlock the 2026 eclipse, it's an easy "yes" for anyone who has invested time and travel to be in the path of totality. In-App Video Tutorial: The first button on the Home Screen provides a comprehensive tutorial that explains all the app's functions and how to use them effectively. Audio and Notification Tests: The second button lets users run a "device sound check" to confirm that audio cues, spoken timings, and notifications are audible, which is critical since the app is designed to talk to you. Practice Session Video: The third button launches a 4-minute-45-second video of my actual eclipse-day observation site in 2024, synchronized with the app's real-time announcements. This allows both observers and photographers to practice their routines repeatedly, such as observing for shadow bands, adjusting shutter speeds, and knowing when to remove solar filters. Additionally, dialogue boxes appear as functions are selected, giving you more guidance. On eclipse day, after you get into the path, you can be timing the eclipse in 3 easy steps: 1. Tap to geolocate. 2. Tap to have the app calculate the precise contact times. 3. Tap to load the times into the timer. That's it! You are timing the eclipse. A major convenience feature of the app is the automatic calculation of the clock times needed to capture a perfect set of partial-phase images before and after totality. It is the only app in the world with this function. Collaborating with the late Fred Espenak (Mr. Eclipse) on Photographers Mode before the 2024 eclipse gives the app an incredible pedigree. For pros who need to stay "in the zone" and only care about timing and countdowns from C1 through C4, this mode is a game-changer. You can manually enter coordinates and save the site as a file. This helps compare multiple potential viewing locations. The app includes a hyperlink to the Solar Eclipse Timer website, which gives access to downloadable worksheets to record your partial-phase image times or the chores you want to do in Photographers mode, as well as my Master Stop Chart to count full and partial camera stops. I have observed and photographed six total solar eclipses and one annular eclipse. The concept of an eclipse “talking” timer was developed by me in 2002. I have been helping people time eclipses for almost 25 years. When you use the app, you will appreciate that it was designed by an eclipse chaser. There is also a link to learn more about my comprehensive eclipse observation and photography book, now in its second edition, titled “Eclipse Day.” The app also has a partial eclipse timing mode. This app is ad-free and does not track any user data. ALWAYS USE EYE PROTECTION DURING THE PARTIAL PHASES OF A SOLAR ECLIPSE! OR EVEN WHEN IT IS BRIGHT! NOT DOING SO CAN CAUSE EYE DAMAGE! We are NOT liable for misuse of the app, causing inaccurate timing, or the lack of eye safety precautions during the observation of a solar eclipse. The "glasses off" and "glasses on" statements are guides based on the calculated contact times. The timing can be affected by your phone's clock and the shape of the shadow due to the edge of the lunar limb. Use the Adjust buttons for Lunar Limb variation time adjustments. Glasses should be ON if it's bright!
Sky Alerts Star Log
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Sky Alerts Star Log is a simple stargazing planner for people who want to spend more nights under the stars and remember every sky moment worth watching. Plan upcoming stargazing sessions, set useful reminders, and keep a personal record of what you observed, from meteor showers and moon events to planets, constellations, telescope nights, camping trips, and Milky Way photo attempts. The app is designed to make night-sky watching easier to organize. Instead of trying to remember dates, places, clear nights, and ideas in separate notes, you can keep your sky plans in one calm and visual planner. Add a session, mark it as planned or active, return to missed observations, and log the nights you completed. Your monthly progress helps you see how often you are getting outside and building your own stargazing habit. Use the sky calendar to understand what is coming next. Organize moon watching, planet viewing, telescope practice, constellation spotting, meteor shower nights, outdoor trips, and quiet evenings under a clear sky. Whether you are planning a camping weekend, preparing for a special astronomy event, or simply looking for a reason to step outside at night, Sky Alerts Star Log helps you turn a sky idea into a real plan. Sky alerts help you avoid missing the moments you care about. Create reminders for meteor showers, moonrise plans, clear-sky windows, return spots, planet nights, and personal observation goals. The app keeps your upcoming and missed sky sessions visible, so a forgotten plan does not disappear. You can catch up later when the weather, timing, or location is better. Sky Alerts Star Log is made for casual stargazers, campers, beginner astronomy fans, outdoor travelers, families, telescope owners, and anyone who wants a friendly way to connect with the night sky. You do not need advanced astronomy knowledge to use it. The focus is simple planning, personal tracking, and making your night-sky experiences easier to repeat. Build your own star log one night at a time. Record completed sessions, follow your progress, and keep track of the sky events that mattered to you. Over time, your log becomes a personal history of clear nights, camping memories, planets viewed, meteor counts, moon observations, photo attempts, and peaceful moments outside. The experience is calm, organized, and easy to use. Soft visual cards, clear status labels, simple session filters, monthly progress, and a focused night dashboard help you see what is planned, what is active, what was missed, and what has already been logged. Everything is built around the real journey of a stargazer: plan the night, get reminded, go outside, observe the sky, and save the memory.
Screenshots
Verdict
The clearest difference is in-app purchases: Sky Alerts Star Log at none against Solar Eclipse Timer's 6. Solar Eclipse Timer's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 17.0). On price and ads 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
Both are free to download. Solar Eclipse Timer sells 6 one-off in-app purchases. Sky Alerts Star Log asks for nothing beyond the download.
| Parameter | Solar Eclipse Timer | Sky Alerts Star Log |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (561 ratings) — better | — |
| Positive reviews | 68.4% of reviews | — |
| Number of ratings | 561 — better | — |
| Update frequency | Monthly | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 231 MB | 4 MB |
| Age rating | 17+ | 4+ |
| Developer | Foxwood Astronomy, LLC. | Mindaugas Vitkauskas |
Bugs and requests
Solar Eclipse Timer
Reported bugs
3 issues- App crashing when loading timing data
- Notifications not working when camera is in use
- Incorrect contact times displayed for some locations
Requested features
5 requests- Customizable reminders or timers
- Automatic time zone and location updates
- Lunar eclipse support
- Improved onboarding and tutorial
- Countdown timer with graphical depiction
Sky Alerts Star Log
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Solar Eclipse Timer
- Total - 7/2/19; Chile, Argenti$1.99
- Total - 12/14/20; Chile, Argen$1.99
- Total – 12/4/21; Antarctica$1.99
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- Hybrid – 4/20/23; Australia$1.99
- Total – 4/8/24; USA, Mexico$1.99
- Solar Eclipse Timer$1.99
Sky Alerts Star Log
No in-app purchases
Questions
Is Solar Eclipse Timer free?
Is Sky Alerts Star Log free?
Do Solar Eclipse Timer or Sky Alerts Star Log have ads?
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