Looking for the best stargazing apps for your phone? A stargazing app is genuinely one of the most useful tools in astronomy. Point your phone at the sky and it overlays the names of stars, constellations, and planets in real time. It’s like having a knowledgeable friend standing next to you going “that one’s Jupiter, that group is Cassiopeia, and that fuzzy thing you can see is the Andromeda Galaxy.”
I’ve tested most of the popular options. Here are the five that are actually worth your time, ranked by how often I reach for them.
The Best Stargazing Apps Ranked
The best all-round stargazing app, full stop. The free version is excellent — it shows you a realistic, real-time sky map with thousands of objects labelled. Point your phone upward and it uses your GPS and compass to identify exactly what you’re looking at. The rendering is beautiful enough that I occasionally use it indoors just to check what’s up tonight before deciding whether to go outside.
The paid “Plus” version adds a telescope control feature, more deep-sky objects, and an extended star catalogue. Worth upgrading if you get serious, but the free version is genuinely all most people need.
Available on: iOS and Android.
2. Sky Tonight by Star Walk (Free with ads / Pro: £5.99)
If Stellarium is the encyclopaedia, Sky Tonight is the friendly guidebook. It has a cleaner, more visual interface and is particularly good at highlighting what’s worth looking at on any given night. The “What’s in the Sky Tonight” feature gives you a curated list of visible events — planet positions, satellite passes, ISS flyovers, and meteor showers — with times and directions.
I use this alongside Stellarium: Sky Tonight to plan what to look for, Stellarium to find it at the eyepiece. The free version has ads but they’re not intrusive.
Available on: iOS and Android.
3. SkySafari (Free basic / Plus: £9.99 / Pro: £29.99)
SkySafari is the most powerful option here, with a database of millions of objects in the Pro version. The basic free version is decent for identification, but the Plus and Pro versions are aimed at more serious observers. They include telescope control, advanced planning tools, and observation logging.
If you own a Go-To telescope, SkySafari Pro’s ability to control your mount wirelessly is genuinely useful — select an object in the app, tap “Go To,” and the telescope slews to it automatically. Expensive for a phone app, but cheaper than a dedicated hand controller upgrade.
Available on: iOS and Android.
4. Clear Outside (Free)
Not a stargazing app in the traditional sense — it’s a weather app specifically designed for astronomers. Clear Outside gives you an hour-by-hour forecast of cloud cover, transparency, seeing conditions, and darkness levels for your exact location. It tells you, in practical terms, whether it’s worth going outside tonight.
I check this app more than any other. There’s no point setting up a telescope if 80% cloud cover rolls in at 9pm. Clear Outside saves you from that disappointment. The seven-day forecast lets you plan ahead, and the “star rating” for each hour gives you a quick yes/no on observing conditions.
Available on: iOS and Android (also has a website).
5. ISS Detector (Free with in-app purchases)
A single-purpose app that does its one job perfectly: it tells you exactly when and where to look for the International Space Station passing overhead. You get notifications before each pass, with the direction it’ll appear from, the peak height in the sky, and how long it’ll be visible.
Watching the ISS cross the sky is one of the easiest and most impressive things you can show someone who’s never done any stargazing. It’s bright, it moves fast, and when you tell people they’re watching a laboratory the size of a football pitch orbiting at 17,000mph with six people inside, their expressions are priceless. The in-app purchase extends it to track satellites, Starlink trains, and other spacecraft.
Available on: Android (iOS alternatives: ISS Finder, Spot The Station by NASA).
NASA also has a free skywatching guide that’s updated monthly with what to look for in the night sky.
Tips for Using Stargazing Apps
Enable night mode. Every app on this list has a red-screen option. Use it. A bright phone screen destroys your dark-adapted vision and takes 20 minutes to recover. Red mode keeps your eyes adjusted while still letting you use the app.
Calibrate your compass. If the app is pointing at the wrong part of the sky, your phone’s compass needs calibrating. Wave your phone in a figure-of-eight motion a few times. This sounds ridiculous but it works.
Don’t rely entirely on the app. Learn the major constellations by eye too. Apps are brilliant crutches, but there’s a satisfaction to recognising Orion, the Plough, or the Summer Triangle without pulling out your phone. Over time, you’ll need the app less and less for the common stuff.
Check Clear Outside first. Seriously. There’s a particular kind of misery that comes from setting everything up, aligning your telescope, and then watching a wall of cloud materialise from nowhere. Clear Outside won’t always save you — this is the UK — but it reduces the disappointment frequency considerably.
All five of these apps have free versions that are genuinely useful. You don’t need to spend anything to get started. Download Stellarium and Clear Outside tonight, and you’re immediately better equipped than I was for my first three months of stargazing.
These stargazing apps have genuinely improved my observing sessions. The right stargazing apps on your phone turn a casual glance at the sky into an informed exploration.
Clear skies.
Daniel is a self-taught astronomy hobbyist based in the north of England. He writes honest telescope guides, gear reviews, and stargazing advice — and remembers what it's like to not know a refractor from a reflector.