Comparison

AI CometStack vs Solar Journal

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

Head to head
About

AI CometStack

Features
Read full description

AI CometStack is a breakthrough comet alignment app designed specifically for mobile astrophotography workflows. Overcome the long-standing tradeoff of comet movement during long imaging sessions. Traditionally, you had to choose between sharp stars (streaked comet) or a sharp comet (trailed stars). AI CometStack solves this by eliminating complex desktop compositing and advanced scripting. Core Features Motion-Aware Stacking: Aligns the comet nucleus across time while preserving star geometry. Two-Path Automation: Integrates stars and comets separately, then blends them on-device. Batch Processing: Handles full-night capture sets with uniform parameters. Pro Format Support: Works natively with FITS, RAW, TIFF, PNG, and JPEG files. Mobile-First Flow: Real-time previews and guided steps built for iOS deep-sky sessions. Simple Workflow Import your exposure frames (or use the included sample files). Let the app automatically track and model comet motion. Validate and adjust the seamless background blend in real time. Export gallery-grade, press-ready images instantly from the field. Support & Feedback Questions, feedback, or need help? Contact us directly at ustransit74@gmail.com Privacy policy and term of use (EULA) is at https://deepskycolor.blogspot.com/2018/12/privacy-policy-for-deep-sky-color-app.html

About

Solar Journal

Features
Read full description

Turn your solar telescope photographs into a personal record of the changing Sun. Import a short sequence of photos and explore your annotated solar disc, detected sunspots and the gentle change in brightness from centre to edge. Open a sunspot to see an enlarged crop from your original photograph, or explore nearby spots as a group. Today gives you your latest observation. Discover brings your measurements into context with concise findings and dated NOAA space-weather information. Trends keeps your observing history visible, with the variation between photographs shown alongside each measurement. • Local photo analysis, with original photographs preserved. • Sunspot counts, apparent dark coverage and visual size comparisons. • Date and time corrections, photo removal and optional group tracking. • CSV, JSON, picture and analysis-prompt reports to share when you choose. • Explicit journal archive backup and restore. • A clearly labelled sample journal to explore without a telescope. Five separate photographs are recommended for each session; two or more usable photographs can be saved. Measurements describe what is visible in processed white-light photographs. They are not magnetic measurements or predictions of solar storms. No account, advertising, subscription or AI service is required. Your photographs are not uploaded for analysis. NOAA information requires a connection and is always dated. Solar Journal is independent and is not endorsed by NOAA or telescope manufacturers. Use properly filtered solar observing equipment and follow its manufacturer's safety instructions.

Screenshots

AI CometStack2 screens
Solar Journal4 screens

Verdict

The call

The clearest difference is in-app purchases: Solar Journal at none against AI CometStack's 1. On price, ads, device support and iOS requirement there is nothing between them.

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

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

Both are free to download. AI CometStack sells 1 in-app purchase, starting at $9.99 per year. Solar Journal asks for nothing beyond the download.

Scorecard1 real difference Ā· 4 level
AI CometStack versus Solar Journal: the parameters behind the verdict, then further details
ParameterAI CometStackSolar Journal
PriceFreeFree
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size105 MB6 MB
Age rating4+4+
Developeryong chong lohSascha Wyss

In-app purchases

1 purchases

AI CometStack

Subscriptions1
  • Yearly Subscription$9.991 Year
None

Solar Journal

No in-app purchases

Questions

Is AI CometStack free?
AI CometStack is free to download, with in-app purchases available.
Is Solar Journal free?
Solar Journal is free to download, with no in-app purchases.
Do AI CometStack or Solar Journal have ads?
Neither AI CometStack nor Solar Journal shows ads.

Other comparisons