Bottom Line: Sky Tonight is the most capable pocket planetarium on mobile, blending a razor-accurate sky map with genuinely useful event forecasting—but its free tier is riddled with velvet ropes that turn stargazing into a scavenger hunt for the "buy" button.
The Identification Loop
Sky Tonight's magic trick is the speed and accuracy of the identification loop. Raise the phone, and the map slews to match your orientation using the device's compass, gyroscope, and accelerometer in concert. The tracking is tight—there's minimal drift and little of the swimming, laggy overshoot that plagues lesser AR astronomy apps. Tap any object and a card slides up with its name, magnitude, rise/set times, and a legible description. The loop from curiosity to answer is short enough that it never breaks the spell of being outside under the stars. That matters more than any spec sheet. Onboarding friction is the enemy of casual apps, and here it's nearly absent.
Search That Actually Understands You
The draw-to-search feature deserves special praise because it inverts the usual problem. Beginners rarely know the catalog designation of what they're looking at—they know it's a "W" shape (Cassiopeia) or a teapot (Sagittarius). Letting users sketch a pattern and having the app match it is the kind of empathetic design that reveals a team that actually watched novices fumble. Once you've found your target, the compass-guided nudge ("turn left, tilt up") closes the gap between knowing and seeing. It's the single best on-ramp for a genuine beginner that I've used.
Planning as a First-Class Citizen
Most sky apps are reactive: they tell you what's up right now. Sky Tonight treats planning as a headline feature, and the payoff is real. The Visible Tonight panel and the calendar don't just dump a list of events—they fold in light-pollution and weather data to tell you whether tonight is worth the drive to a dark-sky site. This is the difference between a novelty and a tool you open before every clear night. The Time Machine extends the same logic across time, letting you scrub to next month's conjunction and confirm it'll clear the treeline from your yard.
Where the Experience Fractures
And here's where I have to stop cheering. The free experience is engineered to feel incomplete. Interface elements are greyed out. Event details tease you and then demand payment. Ads interrupt the very moment you're trying to be quiet and contemplative under the night sky. The functionality is all excellent—but the app spends a disproportionate amount of energy reminding you what you can't do. There's a version of freemium that feels generous (here's a great free tool, upgrade for power features) and a version that feels like a hostage negotiation. Sky Tonight flirts with the latter. The paywall isn't a wall so much as a series of tripwires scattered across an otherwise wonderful interface, and stepping on one every few taps corrodes the sense of wonder the app works so hard to build everywhere else.