StarTracker vs Celestron StarSense Explorer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StarTracker
Explore the night sky in real-time by pointing your device at the stars. Identify celestial bodies, constellations, and deep sky objects with augmented reality and offline data. Adjust time and date to see how the sky changes.
- Augmented reality star gazing
- Identify planets, stars, and constellations
- Offline celestial data
- Search and lock celestial objects
- Time Machine for sky simulation
- Share screenshots of the sky
Read full descriptionHide full description
--- Video on YouTube: http://tiny.cc/starvideo --- --- Thank you all my dear users to make big success of StarTracker, please leave a review or rating if you love this application! --- TOP 5 Education app in 31 countries when FREE! It's so excited to introduce you the best star gazing app on iOS! This app has a super reaction speed and high accuracy, you must try it out and see how fast it is ;) Just hold up and point the device at the sky to see what stars, constellations and deep sky objects you are looking at in realtime. Full utilization of the build-in gyroscope, digital compass and accelerometer drive the best user experience. Features: • Augmented Reality Star Gazing with gyroscope! Just hold up the device. • Sun, Moon, planets and 8000+ stars visible to the naked eyes. • 88 Constellations & 100+ deep sky objects with magnificent graphics. • All data is offline! • Search and Lock the objects in Solar system, 12 Zodiac Constellations, 88 Constellations, Deep Sky Objects and Famous Stars. • 3D compass in AR mode, indicate position of objects your searched. • Location auto set by GPS, or set manually. • Time Machine. Time and date can be adjusted smoothly. • Capture a screenshot and share with your friends on Facebook, Twitter or save to Photos. (Only share to Twitter on iOS5) • Smooth motion flow and quick response which is realized by cutting edge signal processing technique. • Superb high quality graphic display by enabling the retina display of the device and the full screen anti-aliasing technology employment. Usage: • Buttom Right: Hide/Show Main Setting Menu, settings for name display, constellation, deep sky object, night mode, star amount and grid mode. • Top Right: Search Menu (Solar system, 12 Zodiac and 88 Constellations, Deep Sky Object and Famous Stars) • Top Left: Location Menu, choose location from a world map. • Top bar: Time Machine Menu, adjust any time/date. • Buttom Left: AR Compass indicator in AR track mode, pan the screen to enter un-track mode and click track button to back. Tips: • When search any object under un-track mode, it will be locked at the center of the screen, then user can adjust time/date to see changes of the related sky. • When under un-track mode, just lift up the screen and point it to the sky to enter AR track mode.
Celestron StarSense Explorer
This app guides you through the night sky using your smartphone and a compatible telescope. It identifies celestial objects and directs your telescope for optimal viewing, making astronomy accessible for beginners and enthusiasts alike.
- Smartphone-guided stargazing
- Real-time telescope positioning
- Sky recognition technology
- Celestial object database
- Tonight's Best observing list
- Detailed object information and audio
Read full descriptionHide full description
Unleash the power of your smartphone to take you on a guided tour of the night sky, even if you’ve never used a telescope before. STARSENSE SKY RECOGNITION TECHNOLOGY This one-of-a-kind app uses patent-pending technology in combination with a Celestron StarSense Explorer telescope (sold separately) to analyze star patterns overhead to calculate the telescope’s position in real time with pinpoint accuracy. StarSense Explorer’s sky recognition technology has revolutionized the manual telescope by eliminating the confusion common among beginners and enhancing the user experience for even seasoned telescope users. Many would-be astronomers become frustrated or lose interest in their manual telescope because they don’t know where to point it to see planets, star clusters, nebulae, and galaxies—the good stuff! StarSense Explorer tells you exactly which celestial objects are currently visible in the night sky and where to move your telescope to place those objects in the telescope’s eyepiece. THE NIGHT SKY AT YOUR FINGERTIPS The user-friendly planetarium interface allows you to scan the skies for objects you wish to view. You can also search for objects in the extensive database. Not sure what to observe? StarSense Explorer automatically generates a list of all the best stars, planets, galaxies, nebulae and more currently visible from your location. Simply select one from the list and off you go! While you observe, you can access detailed information, images, and audio descriptions for the most popular objects. It’s a great way for the entire family to learn scientific facts, history, mythology, and more, deepening your understanding of the night sky. EASY AS 1-2-3: DOCK, LAUNCH, OBSERVE To get started, assemble your StarSense Explorer telescope and download the app. Your telescope includes a unique unlock code to access the full features of the app. Connect your phone to the telescope by placing it into the StarSense dock and launch the app. After a simple 2-step procedure to align the smartphone’s camera with the telescope, the app displays a view of the night sky and shows a bullseye on the screen to represent the telescope’s current pointing position. From here, you can select an object to view by tapping it in the planetarium view or selecting it from the Tonight’s Best observing list. Objects will vary from night to night; you may see planets like Jupiter or Saturn, nebulae like Orion, the Andromeda Galaxy, or other object types. Once you select an object, the app displays pointing arrows onscreen. These indicate where to move the telescope to find it. Follow the arrows until the bullseye appears centered on target. When the bullseye turns green, the object is visible in the telescope’s lower powered eyepiece. HOW STARSENSE EXPLORER WORKS StarSense Explorer uses image data captured by the smartphone’s camera to determine its pointing position. The app captures an image of the night sky and then matches the star patterns within the image to its internal database in a process like fingerprint matching or facial recognition. The process of extracting star pattern data in images to determine a telescope’s current pointing position is called “plate solving.” It is the same method used by professional observatories and orbiting satellites. The StarSense Explorer app is the first app ever developed that uses plate solving to determine the smartphone’s current pointing position. Other astronomy apps rely on the smartphone’s gyroscopes, accelerometers, and compass to estimate its pointing position. These methods are not accurate enough to place objects within the telescope’s field of view. StarSense Explorer technology is patent-pending. COMPATIBILITY Compatible with iPhone 6 and higher. LOCALIZATION Support for English, Spanish, French, Italian, German, Japanese and Russian.
Screenshots
Verdict
The clearest difference is review sentiment: StarTracker at 83% against Celestron StarSense Explorer's 35%. StarTracker also leads on rating (4.7 vs 3.3) and iOS requirement (6.0 vs 18.6). Celestron StarSense Explorer's advantage is price (Free vs $2.99) and update cadence (every 2 months vs every 12 months). On ratings volume, ads, in-app purchases and monetization model 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
Celestron StarSense Explorer is free to download; StarTracker costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
StarTracker holds the better App Store score, 4.7 against 3.3. Both are backed by a comparable volume of ratings — 158 and 165 respectively. Written reviews point the same way: 83% of StarTracker's written reviews are positive against 35% of Celestron StarSense Explorer's.
StarTracker ships an update every 12 months, Celestron StarSense Explorer every 2 months. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.
| Parameter | StarTracker | Celestron StarSense Explorer |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.7 (158 ratings) — better | 3.3 (165 ratings) |
| Positive reviews | 82.6% of reviews — better | 35.2% of reviews |
| Number of ratings | 158 | 165 — better |
| Update frequency | Every 12 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 6.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 19 MB | 741 MB |
| Age rating | 4+ | 4+ |
| Developer | 身吉 潘 | Celestron, LLC |
Customer experience
StarTracker
Celestron StarSense Explorer
User reviews
StarTracker
From 158 App Store ratingsWhat we love
- 👍 Easy to use and intuitive interface
- 🎯 Accurate star and constellation identification
- ✨ Beautiful graphics and visual design
- 📱 Works offline without internet connection
- 🔍 Helpful for learning astronomy and constellations
Room to improve
- 🧭 Compass calibration issues and inaccuracy
- 🐛 Graphics spinning or displaying incorrectly
- 📞 No developer support or contact options
- 🔄 App not updated for newer iOS versions
- 📱 Display issues on newer phone models (iPhone XR, etc.)
Celestron StarSense Explorer
From 165 App Store ratingsWhat we love
- 🎯 Accurate plate-solving technology for locating celestial objects
- 📚 Comprehensive database with detailed information about objects
- 🎧 Informative audio commentary during observations
- 🔭 Seamless integration with Celestron StarSense telescopes
- 👨🚀 Excellent for beginners to learn astronomy
Room to improve
- 🧭 Persistent compass/directional calibration issues
- 📍 Frequent alignment failures and position detection problems
- 🔄 Requires constant realignment after minor telescope movements
- ❌ Inconsistent accuracy across different iPhone models
- ⏱️ Slow plate-solving on nights with full moon or light pollution
Bugs and requests
StarTracker
Reported bugs
10 issues- Compass doesn't point in correct direction
- App crashes on iOS 6 and older versions
- Graphics spin aimlessly without user input
- Calibration fails repeatedly
- Display cutoff on newer iPhone models
Show 5 moreShow fewer
- Menus and icons disappear at screen edges
- Incompatible with iOS 8 and iOS 9
- Objects appear behind user instead of in front
- Auto-zoom cannot be disabled
- App doesn't work with WiFi-only connections
Requested features
10 requests- Augmented reality capability
- Search function for objects by typing
- Star and object information details (size, mass, distance, composition)
- Ability to disable auto-zoom feature
- Lock screen to prevent continuous compass tracking
Show 5 moreShow fewer
- Google search integration for learning more about objects
- Satellite tracking
- Clickable planets and stars for detailed information
- Better UI button visibility
- Settings persistence between app sessions
Celestron StarSense Explorer
Reported bugs
12 issues- Directional orientation reversed or offset by 90+ degrees
- App fails to locate telescope position on clear nights
- Compass defaults to west direction on startup
- Plate-solving fails to recognize sky position
- App crashes when switching between apps or receiving notifications
Show 7 moreShow fewer
- Phone camera not recognized after app backgrounding
- Invalid code errors despite correct code entry
- Code length validation issues (6-character vs 8-character codes)
- Aspect ratio display problems
- App becomes unresponsive during alignment process
- Inconsistent performance across iPhone models (especially iPhone 14, 15)
- Upside-down display when moving telescope side to side
Requested features
9 requests- Multi-language support (Korean, Chinese, Japanese, Portuguese, Arabic, French, Italian, German)
- Observation logging and favorites/bookmarks system
- Support for additional celestial objects (dwarf planets, comets)
- Pan and zoom functionality without moving telescope
- Standalone app functionality without telescope requirement
Show 4 moreShow fewer
- Better arrow indicators for telescope movement guidance
- Support for non-Celestron telescope models
- Improved compass calibration options
- Session notes and observation history tracking
In-app purchases
StarTracker
No in-app purchases
Celestron StarSense Explorer
No in-app purchases





