Comparison

StoneBusters vs Eclipse Countdown

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

StoneBusters

Features
Read full description

On the mobile screen, users can access data from the Minor Planet Center, such as the NEO Confirmation Page (NEOCP) and the Possible Comet Confirmation Page (PCCP). A list of recently observed NEOs, organized by classification: unnumbered single-opposition, multiple-opposition, and numbered objects. Object from NEOfixer (University of Arizona) may be visualized, filtered and sorted. A personalized β€œstarred” list let the user to have a list of preferred objects available for quick view and a custom list of selected objects, based on various physical and observational parameters may also be listed. Additionally, a list of objects that were removed from the NEOCP is available, with each object graphically categorized by its final classification (e.g., NEO, comet, artificial object, missing object, etc.). Once an object is selected, the app provides detailed information, including: an observation summary (observatory codes and details), Ephemeris calculation, Orbital elements and uncertainty orbit graphic representation for NEO. Users can also "identify" an object displaying physical and orbital data retrieved from NASA JPL's Solar System Dynamics (SSD) database. This includes secondary designations, discovery circumstances, and citation text (if available). There is also the possibility to β€œWAMO” an object with personal MPC observatory code to obtain the status of observation, and also have Summary WAMO data visualized as bar histograms and tables. As a curiosityβ€”and to assist users without an observatory codeβ€”if location permissions are enabled, the app can list the 30 nearest observatory codes based on distance from the user's device. (For security reasons, the exact coordinates or map positions of the observatories are not displayed, and never will be.) The app relies on APIs provided by: - The International Astronomical Union's Minor Planet Center - NASA Jet Propulsion Laboratory's SSD and CNEOS (Center for Near-Earth Object Studies) - NEOfixer (University of Arizona) Some calculations, such as topocentric ephemerides, are performed directly on the device. While the app provides convenient, on-the-fly previews of information, users are strongly encouraged to refer to the official sources mentioned above for authoritative and professionally calculated data.

About

Eclipse Countdown

This astronomical tool provides precise sub-second solar eclipse timings and interactive maps. It guides users through the eclipse experience with real-time calculations, audio cues, and a list of phenomena to observe.

Highlights
  • Precision timing engine
  • Interactive mapping
  • Live audio synchronization
  • List of phenomena to observe
  • Lunar limb profile corrections
  • 3D computational models
Features
Read full description

The Eclipse App is a high-fidelity astronomical tool engineered for observers who demand absolute accuracy as well as beginners who need a guide through the exceptional experience of their first total solar eclipse. Powered by the latest 3D computational models developed by the Besselian Elements Team, this App provides accurate sub-second eclipse contact timings using lunar limb profile corrections. Whether you are a professional researcher, an astrophotographer, or a dedicated eclipse chaser, this app provides the rigorous data necessary for a successful expedition, from interactive map useful for planning, to simulating the countdown and exercise with the equipment, and for real time tracking in case you are moving in search of the right spot. Core Features: β€’ Precision Timing Engine: Real-time calculations of Contact Times based on your exact GPS coordinates β€’ Interactive Mapping: High-resolution path-of-totality overlays including umbral limits an the center-line. The IQP method accounts for the topography on both the lunar limb and at the observer site, as well as relying on an improved value for the eclipse solar radius (959.95" Β± 0.05", based on research by the Besselian Elements Team). The eclipse center-line and the northern and southern limits of the umbral shadow path also account for these three factors. Hence, these lines are not smooth lines, as in most publicly-available eclipse maps, but are noticeably jagged. Two lines are presented at each path limit corresponding to two values of the eclipse solar radius (959.90" and 960.00") in order to display a region of uncertainty rather than a single limit line. β€’ Live Audio Synchronization: A sophisticated voice-cue system that announces critical contact phases and astronomical phenomena (e.g., shadow bands, corona visibility, and solar filtration changes), allowing you to keep your eyes on the sky or your equipment. β€’ List of phenomena to observe during the eclipse at every step, so that you can be reminded to watch at the right time Designed for the Rigorous Observer: The Eclipse App eliminates the margin of error inherent in simplified models. Prepare for the next Great Eclipse with the most scientifically robust tool available on the App Store.

Screenshots

StoneBusters4 screens
Eclipse Countdown4 screens

Verdict

The call

The clearest difference is price: StoneBusters at Free against Eclipse Countdown's $1.99. StoneBusters also leads on update cadence (every 2 weeks vs monthly). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

StoneBusters is free to download; Eclipse Countdown costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

StoneBusters ships an update every 2 weeks, Eclipse Countdown monthly. The most recent releases landed on August 17, 2026 and September 10, 2026 respectively.

Scorecard2 real differences Β· 6 level
StoneBusters versus Eclipse Countdown: the parameters behind the verdict, then further details
ParameterStoneBustersEclipse Countdown
PriceFree β€” better$1.99
Positive reviewsβ€”100.0% of reviews
Update frequencyEvery 2 weeks β€” betterMonthly
AdsNoNo
In-app purchasesNoNo
Monetizationβ€”Paid
DevicesiPhone, iPad, iPod, Mac β€” betteriPhone, iPad, iPod
Requires iOS15.0 β€” better15.1
Further details β€” not scored
Size55 MB49 MB
Age rating4+4+
DeveloperFABRIZIO TOZZIBESSELIAN ELEMENTS PTY LTD

In-app purchases

None

StoneBusters

No in-app purchases

None

Eclipse Countdown

No in-app purchases

Questions

Is StoneBusters free?
StoneBusters is free to download, with no in-app purchases.
Is Eclipse Countdown free?
Eclipse Countdown costs $1.99, with no in-app purchases.
Do StoneBusters or Eclipse Countdown have ads?
Neither StoneBusters nor Eclipse Countdown shows ads.
Which is updated more often, StoneBusters or Eclipse Countdown?
StoneBusters ships an update every 2 weeks, and Eclipse Countdown monthly. Most recently, StoneBusters was updated on August 17, 2026 and Eclipse Countdown on September 10, 2026.

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