The best stargazing app is one you can hold up to the sky and trust: it should name what you're looking at, work offline and warn you about passes and events. Check the free version, offline maps and whether it can drive a telescope. Ten apps follow in no particular order, plus tips for a first night out.
Pointing a phone at the sky and seeing the stars labelled still feels like magic. The bigger question is what you want next: a list of what's visible tonight, alerts for the space station, or charts for a telescope. The apps below cover all three, and most of them come from small teams of astronomy enthusiasts.
They're listed alphabetically and in no particular order, and each description comes from the app's own website or store listing, re-checked today. If you've got a curious child asking why the daytime sky looks the way it does, my plain explanation of why the sky is blue is a good place to start.
Stargazing apps side by side
In the free plan column, Yes means the app's own site or store listing describes a free app, free version or open source software, Trial only means a time-limited trial and No means neither is stated. Many free astronomy apps sell extra catalogues or remove adverts for a fee.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| Cartes du Ciel | Desktop sky chart software | Printable charts for telescope sessions | Yes |
| KStars | Free desktop planetarium | Observation planning and astrophotography | Yes |
| Night Sky | AR stargazing app | Pointing a phone at the sky | Yes |
| Sky Guide | Star map app | Calm, guided sky exploring | Yes |
| Sky Map | Open source Android map | A no-frills map on Android | Yes |
| Sky Tonight | Stargazing guide app | Tonight's events from your location | Yes |
| SkySafari | Astronomy app for telescopes | Controlling a telescope from a phone | No |
| SkyView | AR sky viewer | Quick identifications with no WiFi | Yes |
| Star Walk 2 | Interactive star map | Learning constellations with visuals | Yes |
| Stellarium | Planetarium app | Realistic sky simulation on any device | Yes |
Ten apps for exploring the sky
Cartes du Ciel
Best for: Telescope owners who plan sessions on a computer and want detailed, printable star charts that can also steer a mount.
KStars
Best for: Hobbyists moving into astrophotography who want free planning tools and telescope control on Linux, Windows or Mac.
Night Sky
Best for: iPhone and Apple Watch owners who want to point their phone upward and see stars, planets and satellites labelled.
Sky Guide
Best for: Families and new stargazers who want a clean, quiet star map with notifications for satellites and events.
Sky Map
Best for: Android users who want a simple, open source star finder that works offline without accounts or adverts.
Sky Tonight
Best for: Beginners who want a list of what's visible tonight from their spot, with a calendar of meteor showers and eclipses.
SkySafari
Best for: Amateur astronomers who want a deep object catalogue and to control a compatible telescope from a phone or tablet.
SkyView
Best for: Casual stargazers who want quick, offline answers to what that bright dot is, using the camera view.
Star Walk 2
Best for: Curious kids and adults who learn best from rich visuals and want constellation art drawn over the live sky.
Stellarium
Best for: Learners who want a realistic simulation of the sky at any date and place, from a phone, a browser or a desktop.
When you can see the space station
Spotting the International Space Station is often the moment people fall for stargazing, and timing is everything. NASA's Spot The Station service says all station sightings happen within a few hours before or after sunrise or sunset, because the Sun reflects off the station while your sky is dark.
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What that means for you: set your app's satellite alerts for dawn and dusk. If you go out at midnight hoping to see it, you'll usually be disappointed, even on a perfectly clear night.
Phone apps, desktop planetariums and telescope control
Stargazing apps come in a few shapes. Augmented reality apps use your phone's compass and camera to label whatever you point at, which is ideal for beginners and children. Desktop planetariums show the sky for any date and place on a big screen, and they're the place to plan a session or print a chart. Telescope apps add deep catalogues and can steer a compatible mount.
Most people start with a phone app and only move to desktop software once they've bought binoculars or a telescope. That's a sensible order: learn the constellations first, then go hunting for faint galaxies.
Your first night out with a sky app
- Check the weather and moon phase, as a bright moon washes out faint stars.
- Download the app's star data so it works without signal.
- Turn on the red night mode before you go outside, to protect your night vision.
- Let your eyes adjust in the dark for a while before judging what you can see.
- Start with something bright, such as a planet or a well-known constellation.
- Set an alert for the next space station pass at dawn or dusk.
Getting a photo of the night sky
- Steady the phone. Rest it on something solid or use a small tripod.
- Lock the focus. My guide to getting an iPhone camera to focus shows how to stop it hunting in the dark.
- Turn the flash off. It lights up the foreground and nothing else.
- Wait for darkness. Shoot after twilight has faded for the most stars.
Do you make a stargazing app? Tool makers can ask to be considered for a featured place on this list.
My plain advice on choosing a stargazing app
If you're new to this, pick a free phone app with a good night mode and a simple list of what's up tonight, and use it from your garden before you travel anywhere dark. You'll learn more in five clear evenings than in a month of reading.
Once you've got binoculars or a telescope, add a desktop planetarium for planning and printed charts. And whatever you use, keep the screen dim; a bright phone undoes the dark adaptation your eyes have just spent ages building.
Frequently asked questions
What is the best free stargazing app?
Several apps here are free to download with optional upgrades, and a few desktop planetariums are free, open source software.
Do stargazing apps work without internet?
Most do once you've downloaded the app and its star data, because they rely on your phone's GPS and compass rather than a connection.
How do I find the International Space Station?
Use an app with satellite alerts and look at dawn or dusk. NASA says sightings happen within a few hours of sunrise or sunset.
Why is my sky app pointing the wrong way?
The phone's compass may need calibrating. Move it in a slow looping pattern, away from metal objects, and try again.
Can a stargazing app control my telescope?
Some can, if your telescope has a compatible mount. Check the app's own list of supported equipment.
Are stargazing apps good for children?
Yes. Augmented reality apps that label stars and draw constellation pictures are a great way to get kids looking up.
