Comparison

Constellation88 vs Sky Clock

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

Head to head
About

Constellation88

Features
Read full description

DRAW YOUR OWN CONSTELLATIONS Touch the canvas to create stars and connect them into patterns. Match your creation with real astronomical constellations and learn about the night sky in an interactive way. EXPLORE 88 REAL CONSTELLATIONS Browse detailed information about every officially recognized constellation, from Orion to Ursa Major. Each entry includes: - Real astronomical data and star positions - Beautiful constellation illustrations - Visibility information and observation tips - Historical background and mythology TRACK THE MOON IN REAL TIME Stay connected to lunar cycles with: - Today's moon phase visualization - Precise moonrise and moonset times based on your location - Live Activity and Dynamic Island support - Smart notifications for moonrise and moonset events FEATURES - Interactive drawing canvas with constellation matching - Complete gallery of 88 constellations - Location-based astronomical calculations - Live Activities for at-a-glance moon tracking - Dynamic Island integration (iPhone 14 Pro and later) - Optimized for both iPhone and iPad - Clean, beautiful interface with no ads - Completely free PERFECT FOR Whether you're a stargazing enthusiast, astronomy student, or simply curious about the night sky, this app makes learning constellations engaging and accessible. No prior knowledge required. PRIVACY Your location is used only for accurate moonrise/moonset calculations and never leaves your device.

About

Sky Clock

Identify celestial objects and events visible from your location. Get real-time sky maps, ISS pass predictions, and forecasts for meteor showers and planetary alignments. Works offline without ads or accounts.

Highlights
  • Interactive star and planet map
  • ISS pass predictions
  • Meteor shower and conjunction forecasts
  • Offline functionality
  • Stargazing log
  • Customizable alerts
Features
Read full description

Never miss what's above you. Sky Clock answers one question: what's worth stepping outside for, from exactly where you're standing? It picks tonight's best sight, lists everything worth seeing this week (Space Station passes, planets, the Moon, meteor shower peaks), and points your phone straight at it. No giant star catalog to dig through. No account, no sign-up. WHAT YOU GET FOR FREE - Which planets are up right now, and the ability to use your phone to find them. - A beautiful interactive map of every star you can actually see, drawn for the light you really have. - The next time the International Space Station passes over you, and where to watch for it. - Tonight's verdict, and what's worth staying up for. - The next two nights of the forecast, so you know whether tonight is the one. - Your first three sightings, saved to your own stargazing log. GO FURTHER WITH PLUS - Tonight's plan: a dusk to dawn timeline with your best viewing window, after dark and moon-aware, so you head out at the right time. - The full 7-night forecast: bright ISS passes, close conjunctions, and meteor shower peaks, before they happen. - Alerts before the good stuff. A quiet nudge when the Space Station is about to fly over, a shower is peaking, or a planet is perfectly placed. - An unlimited observation log: tap "I saw it" and build a personal life-list of everything you've ever spotted, synced privately through your own iCloud account. BUILT FOR YOUR BACKYARD Everything is computed for your exact location and works fully offline. No signal needed under a dark sky. No ads, no account, no clutter. Just you, the sky, and a straight answer. Whether you're wondering "what's that bright thing?" or you never want to miss a meteor shower again, Sky Clock is the sky companion that meets you right where you're standing. Look up. We'll tell you where. SKY CLOCK PLUS SUBSCRIPTION - Sky Clock Plus, Yearly: $44.99 per year, with a 14-day free trial. - Sky Clock Plus, Monthly: $6.99 per month. - Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. Manage or cancel it any time in your Apple Account settings. - Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ - Privacy Policy: https://www.skyclockapp.com/privacy

Screenshots

Constellation884 screens
Sky Clock4 screens

Verdict

The call

The clearest difference is in-app purchases: Constellation88 at none against Sky Clock's 2. On price, ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sky Clock sells 2 in-app purchases, starting at $6.99 per month. Constellation88 asks for nothing beyond the download.

Scorecard1 real difference · 8 level
Constellation88 versus Sky Clock: the parameters behind the verdict, then further details
ParameterConstellation88Sky Clock
PriceFreeFree
Rating—4.7 (3 ratings) — better
Number of ratings—3 — better
Update frequency—Weekly
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.0 — better
Further details — not scored
Size10 MB12 MB
Age rating4+4+
DeveloperOne ChoiEric Rosenbaum

In-app purchases

None

Constellation88

No in-app purchases

2 purchases

Sky Clock

Subscriptions2
  • Sky Clock Plus, Monthly$6.991 Month
  • Sky Clock Plus, Yearly14 Days trial$44.991 Year

Questions

Is Constellation88 free?
Constellation88 is free to download, with no in-app purchases.
Is Sky Clock free?
Sky Clock is free to download, with in-app purchases available.
Do Constellation88 or Sky Clock have ads?
Neither Constellation88 nor Sky Clock shows ads.

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