Constellation Guide vs Sky Map
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Sky Map
Identify stars, constellations, planets, and satellites in real time by pointing your device at the sky. Explore celestial objects, track satellites, and discover what's visible tonight with AR overlays and time travel features.
- Real-time sky tracking with AR
- Instant object identification
- Augmented reality overlays
- Time travel sky view
- Satellite tracking (ISS)
- Tonight's sky highlights
- Night mode (red-light filter)
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Explore the universe from your pocket with Sky Map – Star Tracker. Turn your iPhone into a powerful stargazing tool. Simply point your device at the sky to instantly identify stars, constellations, planets, and satellites in real time. Whether you're a beginner or an astronomy enthusiast, discovering the night sky has never been easier. KEY FEATURES Real-Time Sky Tracking Navigate the night sky with precision using AR technology. Watch stars and planets align exactly where they are above you. Instant Object Identification Tap any star or object to learn its name, distance, brightness, and more detailed information. Augmented Reality Mode Overlay constellations, star paths, and labels directly onto the live sky using your camera. Time Travel Sky Move forward or backward in time to see how the sky changes. Track planet movement and upcoming celestial events. Satellite Tracking Follow satellites like the ISS in real time and never miss a pass again. Tonight’s Sky Highlights Discover the best stars, planets, and constellations visible in your location tonight. Night Mode Protect your eyes with a red-light filter designed for comfortable night viewing. PREMIUM FEATURES Access thousands of deep-sky objects (galaxies, nebulae) Advanced zoom for telescope-like experience Smart observation lists Full event calendar (meteor showers, eclipses) Ad-free experience PERFECT FOR Stargazing beginners Astronomy lovers Students & educators Outdoor explorers WHY SKY MAP – STAR TRACKER? Accurate and smooth tracking Beautiful, modern interface Works offline Easy to use for all levels We currently offer the following auto-renewing subscription option: -$7.99 per month -$34.99 per month Payment will be charged to iTunes Account at confirmation of purchase. Your subscription will automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current period. Subscriptions may be managed and auto-renewal may be turned off by going to the Account Settings after purchase. No cancellation of the current subscription is allowed during active subscription period. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Terms of Use: https://tos.nguyenanhapps.com Privacy Policy: https://privacy.nguyenanhapps.com
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Verdict
The clearest difference is review sentiment: Constellation Guide at 100% against Sky Map's 0%. Constellation Guide also leads on rating (5.0 vs 1.0) and update cadence (fortnightly vs every 5 weeks). On price, ratings volume, 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. Constellation Guide sells 2 in-app purchases, starting at $9.99 per month and Sky Map sells 3 in-app purchases, starting at $7.99 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 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 100% of Constellation Guide's written reviews are positive against 0% of Sky Map's.
Constellation Guide ships an update fortnightly, Sky Map every 5 weeks. The most recent releases landed on October 10, 2026 and October 20, 2026 respectively.
| Parameter | Constellation Guide | Sky Map |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Fortnightly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 104 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | PROBABILITY LLC | Nguyen Anh |
Customer experience
Constellation Guide
Sky Map
In-app purchases
Constellation Guide
- Pro Monthly3 Days trial$9.991 Month
- Pro Annual3 Days trial$39.991 Year
Sky Map
- Sky Map Premium Monthly$7.991 Month
- Sky Map Premium Yearly$34.991 Year
- Sky Map Premium Lifetime$49.99




