Comparison

MoonStar vs PDB Viewer

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

Head to head
About

MoonStar

Features
Read full description

MoonStar: Sky Scanner is an AI-assisted night sky scanner designed to help you explore the moon, stars, and night sky in a simple and beautiful way. Capture or upload a night sky photo and get an AI-assisted sky report with helpful insights such as estimated moon phase, star visibility, sky clarity, cloud obstruction, light pollution estimate, image quality, and night sky photography tips. MoonStar is made for anyone who loves looking up at the sky, taking moon photos, learning about stars, or saving beautiful night sky moments. WHY MOONSTAR: • Scan the moon, stars, and night sky • Get AI-assisted sky reports • Estimate moon phase from photos • Check star visibility • Understand sky clarity • Detect possible cloud obstruction • Estimate light pollution level • Review image quality • Get night sky photography tips • Save scans to your sky journal • Learn simple astronomy facts • Build your personal night sky history AI NIGHT SKY SCANNER: Use MoonStar to scan: • Moon photos • Starry sky photos • Night sky images • Cloudy sky conditions • Bright sky objects • Stargazing moments • Moonlight scenes The app analyzes your image and gives a simple educational report that may include detected objects, moon visibility, moon phase estimate, star visibility score, sky clarity score, light pollution estimate, image quality, summary, and practical tips. MOON PHASE INSIGHT: MoonStar can help estimate the visible moon phase when the moon appears clearly in your photo. The result may include phases such as crescent moon, first quarter, full moon, gibbous moon, or other visible phase estimates. STAR VISIBILITY AND SKY CLARITY: MoonStar can help you understand whether your night sky photo appears clear, cloudy, too dark, overexposed, blurry, or affected by light pollution. This makes it easier to learn how to capture better moon and star photos. SKY JOURNAL: Save your favorite scans and build your own night sky journal. Keep your moon photos, star scans, AI reports, dates, notes, and favorite sky moments in one place. LEARN AS YOU EXPLORE: MoonStar includes simple educational sky guidance to help you learn about moon phases, stars, planets, light pollution, cloud visibility, and better night sky photography. FREE AND PREMIUM: Free users can try basic AI sky scanning and limited sky journal features. Upgrade to MoonStar Premium for: • Unlimited AI night sky scans • Detailed AI sky reports • Moon phase insights • Star visibility analysis • Sky clarity reports • Light pollution estimates • Unlimited sky journal • Stargazing tips • Photo quality guidance • Premium scan experience IMPORTANT DISCLAIMER: MoonStar provides AI-assisted sky insights for educational and entertainment purposes only. Results are estimates and may vary depending on camera quality, weather, light pollution, location, image clarity, exposure, clouds, and other environmental conditions. MoonStar is not a professional astronomy tool, scientific measurement instrument, navigation tool, research tool, or guaranteed sky object identifier. Always verify important astronomy information with trusted sources if accuracy is required. Subscriptions auto-renew unless canceled at least 24 hours before the end of the current period. Manage or cancel subscriptions in your Apple ID account settings. Privacy Policy: https://ccrdeveloper.github.io/legal-pages-ios/moonstar-skyscanner-privacy-policy/ Terms of Use: https://ccrdeveloper.github.io/legal-pages-ios/moonstar-skyscanner-terms-of-use/ Support: https://ccrdeveloper.github.io/support/support.html Email: ccrdevbusiness@gmail.com

About

PDB Viewer

Features
Read full description

PDB Viewer turns your phone into a molecular microscope. Search the entire Protein Data Bank and over 200 million AlphaFold predictions, then explore any protein, virus, drug, or DNA structure in interactive 3D — free, with no account, no ads, and no sign-up. WHERE THE MOLECULES COME FROM • RCSB Protein Data Bank — 200,000+ experimentally determined structures • AlphaFold — 200M+ AI-predicted protein models • SWISS-MODEL — template-based homology models • PubChem and ChEMBL — millions of drugs and compounds • Crystallography Open Database — small-molecule crystals • NCI/CADD resolver — type a chemical name and get a 3D model Every source is free and needs no API key. You can also open your own .pdb and .cif files. WAYS TO SEE IT • Five representations: wireframe, ball-and-stick, space-filling (CPK), cartoon/ribbon, and a smooth molecular surface • Color by element, chain, secondary structure, rainbow, or AlphaFold confidence (pLDDT) • Biological assemblies: rebuild an entire icosahedral virus capsid from a few deposited chains • NMR ensembles: overlay every model in the bundle to watch a protein flex • Automatic secondary-structure detection MADE FOR TOUCH • Rotate, pinch-zoom, and pan with smooth native rendering • Tap any atom to see its element, residue, and chain • Recently viewed structures are cached, so they reopen instantly and work offline For students, researchers, teachers, and the simply curious. PDB Viewer makes structural biology beautiful and accessible. Structures are provided by their respective databases. PDB Viewer is independent and not affiliated with or endorsed by the RCSB PDB, EMBL-EBI, or AlphaFold.

Screenshots

MoonStar4 screens
PDB Viewer4 screens

Verdict

The call

The clearest difference is iOS requirement: PDB Viewer at 16.0 against MoonStar's 26.5. On price, ads, in-app purchases and device support 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. MoonStar sells 2 in-app purchases, starting at $2.99 per month and PDB Viewer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference Ā· 5 level
MoonStar versus PDB Viewer: the parameters behind the verdict, then further details
ParameterMoonStarPDB Viewer
PriceFreeFree
Update frequency—Monthly
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.516.0 — better
Further details — not scored
Size23 MB2 MB
Age rating4+4+
DeveloperSyahrul Ahmad SaputraQvyshift LLC

In-app purchases

2 purchases

MoonStar

Subscriptions2
  • Premium Access Monthly7 Days trial$2.991 Month
  • Premium Access Yearly$29.991 Year
1 purchases

PDB Viewer

One-time1
  • PDB Viewer Pro$9.99

Questions

Is MoonStar free?
MoonStar is free to download, with in-app purchases available.
Is PDB Viewer free?
PDB Viewer is free to download, with in-app purchases available.
Do MoonStar or PDB Viewer have ads?
Neither MoonStar nor PDB Viewer shows ads.

Other comparisons