ScopeTool vs StellarMate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ScopeTool
This app assists with telescope setup and alignment, providing tools like a compass, level, and calculators for celestial objects. It allows manual or GPS-based location input and offers customizable tool visibility for use in low light.
- Compass and level
- Polaris hour angle calculator
- Jupiter and Saturn moon positions
- Red/white flashlight with timer
- Manual or GPS location input
- Customizable tool visibility
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ScopeTool by Krydo helps as you set up, align and use your telescope for a good night's viewing. It includes the tools • Compass & level • Polaris hour angle and transit calculator • Positions for the main satellite moons of Jupiter and Saturn* • Red or white flashlight, with screen lock and timer functions ScopeTool can find your location by either using your device's location services (eg GPS), or you can enter your coordinates manually. The Settings tool allows you to tailor the app to your needs; turn off tools you don't use so it's easy to select the ones you want in the dark. More tools are coming; visit http://scopetool.krydo.com or tweet us on @KrydoDev to keep up with their progress, and let us know what would be useful to you! * For Jupiter, the four Galilean moons are shown. For Saturn, satellites I-VIII are included. A limiting magnitude control allows you to hide objects that are too faint to be seen, so you can match the diagram to what you can see. The location of Jupiter's Great Red Spot and attitude of Saturn's rings are also included.
StellarMate
Control your astrophotography equipment remotely. Capture images, stream video, and perform precise alignment. Automatically back up your photos to the cloud with rich metadata for easy searching.
- Remote equipment control
- Image capture and video streaming
- Polar alignment assistant
- Cloud image backup
- Metadata search and sorting
- Software updates
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Use StellarMate App to discover and connect to your StellarMate controller. Control StellarMate functions and access the Web Manager and Web based VNC Viewer. Join StellarMate to your home WiFi network. Use Ekos to capture images, stream video, guide, focus, and align. With Polar Alignment Assistant tool, get very accurate polar alignment using internal astrometry engine. Never lose your images again with EkosLive Pro. All captured images are automatically uploaded to the cloud with a rich set of metadata that enables powerful search and sorting. Use custom tags to uniquely tag important frames for later use. Check the health of your device, and use the software updater to keep it up to date.
Screenshots
Verdict
The clearest difference is rating: ScopeTool at 3.8 against StellarMate's 2.9. ScopeTool also leads on review sentiment (50% vs 35%) and iOS requirement (9.0 vs 16.0). StellarMate's advantage is update cadence (every 8 days vs every 9 months) and ratings volume (26 vs 4). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ScopeTool holds the better App Store score, 3.8 against 2.9. That said, the two scores are not equally well evidenced: StellarMate has 26 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 50% of ScopeTool's written reviews are positive against 35% of StellarMate's.
ScopeTool ships an update every 9 months, StellarMate every 8 days. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.
| Parameter | ScopeTool | StellarMate |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (4 ratings) — better | 2.9 (26 ratings) |
| Positive reviews | 50.0% of reviews — better | 34.5% of reviews |
| Number of ratings | 4 | 26 — better |
| Update frequency | Every 9 months | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 9.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 6 MB | 115 MB |
| Age rating | 4+ | 4+ |
| Developer | H Crossley | Ikarus Astronomy Company For Scientific Instruments & Tools |
Customer experience
ScopeTool
StellarMate
In-app purchases
ScopeTool
No in-app purchases
StellarMate
No in-app purchases








