SkySafari vs. Stellarium: Which Sky App Is Worth Paying For?

You point your phone at a bright star and the screen names it. Two apps dominate the moment most people get into the night sky this way, and they sit side by side in every “best astronomy app” list: SkySafari and Stellarium. They do the same core thing — hold the phone up, see the sky labeled over the real one — and from the store they look like the same kind of app. They are not. One is free everywhere you’d want it, and the other charges from the first tap.

Where I land: install Stellarium first, because it’s free and already does what most people need, and pay for SkySafari only once you own a telescope. Stellarium’s free app covers naked-eye and binocular observing on its own, and it’s also free on a laptop and in a browser. SkySafari is the deeper paid tool — the richest object database on a phone and the smoothest way to drive a go-to mount, especially a Celestron — and that depth is what you’re buying when the free app stops being enough.

Prices and features below were read from both makers’ own pages and their US app-store listings on October 30, 2026. App prices change, go on sale often, and vary by country; the store shows yours. Neither maker pays us, and there are no affiliate links on this page. How we choose.

If you just want the answer

• Install Stellarium if you want a free app that names the sky, works offline, lets you scrub time to any date, and runs on your laptop too. For most people this is the whole decision, and it costs nothing.
• Buy SkySafari Plus ($29.99) once you own a telescope and want to drive it from the phone, with a far larger object database than you’ll ever exhaust by eye.
• Buy SkySafari Pro ($49.99) if you want the deepest catalog going — over 100 million stars, every comet and asteroid on file — plus guided tours and cloud backup. It’s the enthusiast’s app, not the beginner’s.
• Skip SkySafari Basic ($6.99) unless you specifically like its interface: free Stellarium does more.

SkySafari and Stellarium compared

	SkySafari	Stellarium
Made by	SkySafari Astronomy (Simulation Curriculum)	Noctua Software (mobile); open-source project (desktop)
Where it runs	iOS, Android	iOS, Android, desktop, browser
Free version	No — every edition is a paid app	Yes, no ads
Entry price	Basic $6.99	Free
Top paid tier	Pro $49.99 (Plus $29.99 between)	Stellarium Plus: about $19 one-time, or a small subscription
Point-at-sky camera view	Yes	Yes, free
Works offline	Yes, catalog on the device	Yes, about 2 million stars built in
How many stars	Basic ~120,000; Plus ~2.5 million; Pro 100 million+	Magnitude 8 free; 1 billion+ with Plus
Deep-sky objects	Plus 32,000 to mag 15; Pro adds 3 million galaxies	In the catalog free; fainter ones with Plus
Scroll through time	Yes	Yes
Telescope control	Plus and Pro, over Wi-Fi	With Plus (mobile); free on desktop
Guided tours	Yes (“Tonight’s Best” and narrated tours)	No

Where Stellarium wins

It’s free, and it goes wherever you do. Stellarium began more than 20 years ago as free, open-source planetarium software for computers, and that desktop program is still free at stellarium.org for Windows, Mac and Linux. There’s a browser version at stellarium-web.org that needs no install at all, and the phone app from Noctua Software is free with no ads. The free app already includes the two things people assume they’ll have to pay for: the camera view that labels the real sky, and offline use from a built-in catalog of about 2 million stars. That matters at a dark site, which is usually where the phone signal isn’t.

Its free tier shows stars to about magnitude 8, a touch fainter than the eye can see from a truly dark site, so it covers everything you can observe without a telescope. Scrub the clock and the whole sky wheels overhead, which is how you learn why Orion is a winter constellation or where the Moon will sit next week. The paid Stellarium Plus upgrade pushes the catalog past a billion stars to magnitude 22 and adds telescope control over Wi-Fi and an eyepiece-view preview — but you only need it once you own a scope, and even then it costs about $19 against SkySafari’s $29.99–$49.99.

Where SkySafari wins

Depth, polish, and the best telescope control in the Celestron world. SkySafari, made by Simulation Curriculum, is the app serious observers tend to settle on, and the reason is the database. SkySafari Pro ($49.99) carries over 100 million stars, 3 million galaxies, and every comet and asteroid ever discovered — more than you could work through in a lifetime, but exactly what you want when you’re hunting a faint target through a big scope. SkySafari Plus ($29.99) steps down to about 2.5 million stars and 32,000 deep-sky objects, still far beyond naked-eye observing, and both Plus and Pro drive a go-to mount over Wi-Fi: they speak ASCOM, INDI, SkyFi, Celestron’s own Wi-Fi and StarSense, so if you own a Celestron, SkySafari is the natural remote. Pro adds narrated sky tours, a “Tonight’s Best” list and cloud backup, and the interface is the most finished of any sky app.

The honest other half: that depth is overkill for a beginner, and none of SkySafari is free. The entry-level Basic edition is $6.99 and shows about 120,000 stars — genuinely less than free Stellarium — so it’s hard to recommend over the free app unless you simply prefer SkySafari’s look. There’s also an optional Premium subscription on top for extras like cloud features, which most people can ignore. SkySafari earns its price the day you point a telescope at the sky, not before.

Which to install, by what you want

1. “What is that bright thing?” Either one. Stellarium’s free app does it for nothing.
2. “I don’t want to pay for an app.” Stellarium, every time — phone, desktop and browser are all free.
3. “What will be up tonight, and when?” Either; scrub the clock in Stellarium, or open SkySafari’s “Tonight’s Best.”
4. “I just bought a telescope.” Stellarium Plus if you want the cheapest scope control; SkySafari Plus or Pro if you want the deepest database and the smoothest Celestron connection.
5. “I want the single best object catalog on a phone.” SkySafari Pro.
6. “I’m planning on a laptop.” Stellarium, whose desktop program and browser version are both free.

The cheapest sensible path is to start with free Stellarium, use it until it stops answering a question you actually have, and buy SkySafari Plus or Pro only when that day comes.

What about Star Walk 2 and Sky Tonight?

Those are the other two apps people weigh against these. Star Walk 2 is the prettiest quick point-and-identify and the best one to hand a kid; Sky Tonight is the planner for what’s visible from where you’re standing tonight. If that’s the comparison you’re actually in, we put the free options head to head in Stellarium vs. Star Walk 2 and Stellarium vs. Sky Tonight, and all of them sit side by side in the full astronomy-apps guide.

Keep your night vision

A bright phone screen undoes the 20 minutes your eyes spent adjusting to the dark, and both of these apps have a red night mode — switch it on before you step outside, not after, and turn the phone’s brightness to the bottom. For finding your way around the site, a red flashlight keeps your night vision where the phone can’t. And once an app has shown you where things are, a pair of binoculars is the cheapest way to see far more of them.