You do not need a telescope to start enjoying the night sky. A free app or website can tell you which bright "star" is actually a planet, when the International Space Station will pass overhead, and where to look for a faint comet. This guide covers a few reliable free tools, what each one is good for, and how to use them well on your first night out.
A sky map is a simulation of the sky for your location and time. You set where you are and when, and the software draws the stars, planets and the Moon as they appear from there. Many phone apps also use the compass and motion sensors, so you can hold the phone up and the map follows where you point it.
Two habits make any app more useful. First, check that the location and clock are correct, because a wrong time zone puts every object in the wrong place. Second, learn to read the map against the real sky: find the Moon or a bright planet first, then work outward from it.
Stellarium is a free planetarium program that renders a realistic sky in real time. The desktop version is open-source software for Windows, macOS and Linux, and the project also offers a browser version, Stellarium Web, that needs no installation. Its mobile app is free to download, with a paid upgrade that unlocks extra features, so check the store listing for what is included before you rely on a specific function.
It is a good first choice because it shows constellations, planets, the Moon's phase and deep-sky objects, and you can move time forward or backward. That last feature is handy for planning: you can see where Jupiter will be next month, or what the sky looked like on the night of a past event.
Stargazing is not only about what you can see from your garden. NASA's Eyes on Asteroids is a free tool that runs in a web browser and shows near-Earth asteroids moving around the Sun in a 3D simulation. NASA says it is updated with new tracking data and lets you click an object to read about it and see its upcoming close approaches.
It will not tell you where to point your eyes tonight, but it explains the geometry of the 2029 flyby better than any text. If you are new to the topic, read what a near-Earth object is first, then explore the app. For the science behind the data, see how NASA tracks asteroids.
The easiest "space event" for a beginner is a satellite pass. The International Space Station is bright and crosses the sky in a few minutes, so it is a satisfying first target.
These tools also solve a common puzzle. A line of lights crossing the sky is usually a batch of newly launched satellites, not something mysterious; our article on Starlink satellites vs. UFOs explains how to tell them apart. If you want to take a picture of a pass, see how to photograph a satellite.
Be careful with sponsored lists of "best astronomy apps". Prices, free features and subscriptions change often, and some apps have limited free versions. Read the current store listing and recent reviews rather than relying on an old recommendation, including this one.
Do I need an internet connection? Some apps work offline once their data is downloaded, but others need a connection for pass predictions or updated data. Check before you go somewhere remote.
Will an app help me see Apophis in 2029? Yes. Apophis is expected to be visible to the naked eye from parts of the Eastern Hemisphere during its closest approach, and apps can help you find the right part of the sky. See our Apophis 2029 guide for details.