Starmap vs Sky Map
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Starmap
Explore the night sky with a comprehensive star atlas. Identify celestial objects, track comets and asteroids, and access detailed information on stars, constellations, and lunar features. Includes live solar physics data and a red night-vision mode for stargazing.
- Extensive star and object catalogues
- Live solar physics data
- Detailed lunar features
- Real-time comet and asteroid tracking
- Telescope and eyepiece simulation
- Red night-vision mode
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Point your phone at the sky and see what's there — stars, planets, constellations, the northern lights. Starmap works completely offline, anywhere, with no signal. Built by a professional astronomer and given freely. No ads. No subscriptions. No in-app purchases. No tracking of any kind. Everything is unlocked from the first launch. AURORA AND NORTHERN LIGHTS Live aurora forecasts from NOAA, with the Kp index, the three-day outlook and the auroral oval for both hemispheres. Know whether tonight is worth staying up for. OUT WITH THE FAMILY Hold the phone up and it names whatever you're looking at. An arrow guides you to any planet, star or constellation. Every catalogue is stored on the device, so it works in the mountains, at sea, or anywhere without a signal. THE SUN AND THE MOON Sunspots, flares and X-ray flux, live from NOAA. 9,900 named lunar features with their origins and etymologies. Rise, transit and set times for everything, which you can send to your calendar. FOR SERIOUS OBSERVERS 2.5 million stars stored offline, down to magnitude 15. The full Messier, NGC, IC and Caldwell catalogues, plus Sharpless, van den Bergh, Lynds, Barnard and Abell clusters. Live comets, asteroids and trans-Neptunian objects from the Minor Planet Center. Deep-sky records enriched on demand from SIMBAD, searchable by any catalogue identifier. AT THE EYEPIECE Define your telescope, eyepieces and camera, and see the true field of view you'll actually get, with Telrad rings and reticles. A full red night-vision mode for use in the dark. The whole sky in your pocket — free, because that is what it should be.
Sky Map
Identify stars, planets, and constellations by pointing your device at the sky. Offers offline functionality, multiple visual styles, and real-time ISS and meteor shower tracking. Includes Apple Watch and widget support.
- Live star and planet identification
- Offline functionality
- ISS and meteor shower tracking
- Multiple visual sky styles
- Apple Watch integration
- 13 customizable widgets
- 100% red night mode
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Point your phone at the sky — and know. Sky Map identifies every star, planet, constellation and deep-sky object you point at, instantly and fully offline. 115,000+ real stars and all 88 constellations render at buttery frame rates, aligned to your exact horizon. FIRST ON THE APP STORE • ISS Pass Live Activity — a countdown and pass arc right on your Lock Screen and Dynamic Island. Never miss a flyover again. • Meteor-shower peak nights and darkness countdowns as Live Activities too. THE SKY, YOUR WAY — 8 STYLES Realistic, Chart, Atlas (engraved gold), Red Night, Astro-photo, Aurora, Ink & Paper, Minimal Mono. Your chosen look follows you across the app, all 13 widgets and Apple Watch. BUILT FOR REAL NIGHTS • True 100% red night mode — protects your dark adaptation on every screen • Stargazing Index: one 0–10 score from clouds, Moon and light pollution • Drag-to-align compass correction + magnetic-interference detection • Stars twinkle. Planets don't. (That's real physics — and how you tell them apart.) ON YOUR WRIST Wrist-guided ISS spotting with a live bearing ring, a whole-sky dial, a solar-system orrery you can scrub through time, and Smart Stack complications that surface exactly at dusk. 13 WIDGETS Live sky chart, 360° horizon panorama, Moon phase calendar, solar system now, constellation of the day, aurora Kp index, the Sun live from NASA SDO, event countdowns with a one-tap reminder bell, and a red Nightstand mode for StandBy. HONEST BY DESIGN • Works 100% offline — airplane mode, backcountry, anywhere • No account. Your location never leaves your device. • The free tier stays free, forever. Premium adds depth: the 115,000-star deep catalog, 450+ NGC/IC objects, satellites, comets, event reminders, observation lists with FREE iCloud sync, and every style. The sky is out tonight. Go look up. For more information, please see our Privacy Policy and Terms of Use. • Terms of use: https://deeplyai.app/terms.html • Privacy policy: https://deeplyai.app/privacy.html Support & Contact Need help? • Rate us! Got feedback? info@deeplyai.app
Screenshots
Verdict
The clearest difference is ads: Starmap at none against Sky Map's shown. Starmap also leads on monetization model (free vs free with in-app purchases) and ratings volume (4 vs 1). Sky Map's advantage is device support (3 vs 1). On price, rating, update cadence 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. Starmap sells 10 one-off in-app purchases and Sky Map sells 4 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.0 for Starmap against 4.0 for Sky Map. Both are backed by a comparable volume of ratings — 4 and 1 respectively.
Starmap ships an update every 2 weeks, Sky Map every 3 weeks. Both last shipped on October 22, 2026.
| Parameter | Starmap | Sky Map |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) | 4.0 (1 ratings) |
| Positive reviews | 76.6% of reviews | — |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, Apple Watch — better |
| Requires iOS | 18.6 | 18.6 |
| Further details — not scored | ||
| Size | 110 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | Fredd | DEEPLY AI |
Customer experience
Starmap
Sky Map
In-app purchases
Starmap
- What Happens when Galaxies Collide?$0.99
- Wandering the Summer Sky$0.99
- Exploring the Crab Nebula$0.99
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- 10h8'22", 11°58'2"$0.99
- The Star That Should Not Exist$0.99
- Un océan d'étoiles$0.99
- Esculape$0.99
- Sur le dos du cheval ailé$0.99
- L'étoile qui ne devrait pas exister$0.99
- Vieillesse prématurée à Galaxie-Ville$0.99
Sky Map
- Sky Map Premium Weekly$1.997 Days
- Sky Map Premium Monthly$5.991 Month
- Sky Map Premium Yearly$24.991 Year
- Sky Map Premium Lifetime$79.99








