Sky Guide vs Constellation Guide
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sky Guide
Identify stars, constellations, planets, and satellites in real-time by holding your device overhead. Explore celestial bodies with AR overlays, track satellites like the ISS, and travel through time to view past and future astronomical events. Perfect for both novice and experienced stargazers.
- Automatic celestial object identification
- Augmented reality sky overlay
- Satellite tracking and notifications
- Time travel for past/future viewing
- Personalized astronomical event calendar
- Offline functionality
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Bring the beauty of the stars down to Earth. Hold Sky Guide® overhead to automatically identify any star, constellation, planet or satellite! Easy to use and powerful, it’s epic stargazing for any experience level. Is it a star or the planet Mars? Knowing what’s up in your night sky is easier than ever. Sky Guide’s AR mode superimposes figures onto your real sky so visualizing the heavens becomes effortless. Have you ever wished you could recognize constellations but didn’t want to fumble around with paper star charts? Now you can. A speck of light crosses the night sky, growing brighter. What could it be? You don’t have to wonder anymore. Track a bright satellite and receive perfectly-timed notifications whenever the International Space Station is about to fly over your location. With Sky Guide, you’ll be saying ‘Goodbye, aliens’ and ‘Hellooooo, astronauts!’ Voyage to the past or future with cinematic time controls. Know where the Moon will be later in the evening so you can capture that perfect photo or be an eyewitness to history’s greatest comets. Whether you’re searching for Sagittarius, Saturn, or the next big meteor shower, Sky Guide is jam-packed with information and rich graphics that will satisfy the most curious minds. Plus, stay current with location-filtered events like solar and lunar eclipses with Sky Guide’s personalized Calendar. Camping in the backcountry? Sky Guide can function with or without Wi-Fi, cellular service or GPS, so everything is at your fingertips no matter where you go. Join the millions who have discovered a more personal connection to the stars with Sky Guide. It might forever change the way you look up. Terms of Use: https://www.fifthstarlabs.com/terms-of-use
Constellation Guide
Explore the night sky with an AI-powered guide. Identify stars, constellations, and planets in real-time with AR overlays. Learn astronomy through stories and deep space exploration, all available offline.
- AI Sky Guide for astronomy questions
- Deep Space Zoom into nebulae and galaxies
- Astronomy Stories and Constellation Art
- Time Travel to past and future sky views
- AR Camera Mode for real-time identification
- Offline sky mapping
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Explore the night sky with AI-powered guidance. Constellation Guide features 88 constellations, 8,835 stars, and intelligent chat to answer your astronomy questions — all offline. Perfect for: • Identifying stars and constellations in real-time • Learning astronomy with AI assistance • Planning stargazing sessions • Offline sky mapping anywhere • Space exploration and education Perfect for: • Identifying stars and constellations in real-time • Learning astronomy with AI assistance • Planning stargazing sessions • Offline sky mapping anywhere • Space exploration and education WHAT MAKES CONSTELLATION GUIDE DIFFERENT • AI Sky Guide Ask anything about astronomy and get instant, accurate answers. Your AI astronomer knows the cosmos inside out and can explain everything from black holes to meteor showers in plain language. • Deep Space Zoom Dive into nebulae, galaxies, and star clusters with unprecedented detail. Explore the Orion Nebula, Andromeda Galaxy, and more deep space wonders. • Astronomy Stories Discover the myths, science, and history behind every constellation. From ancient Greek legends to modern astrophysics, there's always something new to learn. • Beautiful Constellation Art See constellations come alive with hand-crafted artwork that brings ancient star patterns into the modern age. • Time Travel Rewind to see the sky on any historical date, or fast-forward to plan tomorrow's stargazing session. Watch planets dance across the heavens at any speed. • AR Camera Mode Overlay constellations directly onto your real-time camera view. Perfect for identifying stars when you're actually outside under the night sky. • Night Mode Preserve your night vision with a red-tinted display that won't ruin your eyes' adaptation to darkness. • Works Offline Take the entire cosmos with you anywhere. No internet required once downloaded. COMPLETE FEATURES • Real-time sky map that follows your device's movement • Thousands of stars with accurate positions and data • 88 constellations from cultures around the world • Planets, moons, and the International Space Station • Deep zoom into nebulae and galaxies • AI astronomer for instant answers to any space question • Hundreds of curated astronomy stories and facts • Time travel to any date, past or future • AR camera overlay for stargazing outdoors • Night mode to protect your vision • Search to find any celestial object instantly • Works completely offline • No ads, ever PERFECT FOR • Backyard stargazers who want to know what they're looking at • Parents teaching kids about space and science • Campers and hikers exploring dark sky locations • Amateur astronomers planning observations • Anyone curious about the universe above SUBSCRIPTION & PRICING Constellation Guide is free to download with a 3-day trial. After the trial: • Monthly: $6.99/month • Annual: $39.99/year (save 52%) Subscription automatically renews unless cancelled at least 24 hours before the end of the current period. Manage subscriptions in your App Store account settings. ABOUT THE DATA Our comprehensive star database features thousands of stars with positions accurate to modern astronomical standards. Constellation artwork and stories are carefully researched and beautifully presented. Deep space images come from professional astronomy sources. PRIVACY & SUPPORT We respect your privacy. Location is used only to show your local sky and is never shared. Privacy Policy: https://probabilityapps.com/privacy Terms of Service: https://probabilityapps.com/terms Support: support@probabilityapps.com Point your device at the stars. Discover the universe.
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Verdict
The clearest difference is ratings volume: Sky Guide at 374K against Constellation Guide's 2. Sky Guide also leads on chart position (#22 vs unranked) and device support (4 vs 2). Constellation Guide's advantage is rating (5.0 vs 4.8) and review sentiment (100% vs 86%). On price, update cadence, ads and in-app purchases 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. Sky Guide sells 6 in-app purchases, starting at $4.99 per month and Constellation Guide sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
Constellation Guide holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Sky Guide has 374K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 86% of Sky Guide's written reviews are positive against 100% of Constellation Guide's.
Sky Guide ships an update every 2 weeks, Constellation Guide fortnightly. The most recent releases landed on September 26, 2026 and September 13, 2026 respectively.
| Parameter | Sky Guide | Constellation Guide |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (374K ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 86.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 374K — better | 2 |
| Update frequency | Every 2 weeks — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #22 — better | — |
| Devices | iPhone, iPad, Apple Watch, Vision Pro — better | iPhone, iPad |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 379 MB | 104 MB |
| Age rating | 4+ | 4+ |
| Developer | Fifth Star Labs LLC | PROBABILITY LLC |
Customer experience
Sky Guide
Constellation Guide
Bugs and requests
Sky Guide
Reported bugs
2 issues- App freezes when near polar regions
- Occasional crashes or performance issues
Requested features
5 requests- Add more detailed information on moons of planets
- Implement mosaic planning tools for astrophotography
- Provide earlier notifications for satellite/ISS passes
- Allow users to share their observations and photos
- Improve integration with telescope/camera equipment
Constellation Guide
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Sky Guide
- PLUS$4.991 Month
- PRO$8.991 Month
- PLUS7 Days trial$39.991 Year
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- PRO7 Days trial$59.991 Year
- All Constellations$1.99
- PRO Lifetime$249.99
Constellation Guide
- Pro Monthly3 Days trial$9.991 Month
- Pro Annual3 Days trial$39.991 Year






