Stellarium - Star Map

Review by eFreeware

If you have ever stood outside at night and wondered which bright point overhead is a planet and which is a star, Stellarium is built for exactly that moment. Point your phone at the sky and it names what you are looking at: stars, constellations, planets, comets, satellites such as the International Space Station, and deep sky objects. The developer, Noctua Software, has made the app free to download, and it carries no ads.

That combination makes it easy to suggest to a broad group. A parent answering questions from a child on a clear evening, a teenager getting into astronomy, or an adult who simply wants to know what is above the backyard can all start with the same gesture. The app is rated for Everyone, and its stated aim is a simple, uncluttered interface rather than a professional observatory console.

It is also worth noting the pedigree: the app comes from the original creator of the desktop Stellarium planetarium, a name many amateur astronomers already know. With more than 10 million installs and a 4.8 average from over 337,000 ratings, it has clearly found a wide audience since its release in December 2020. None of that guarantees it fits your needs, but it does suggest a mature, widely used tool rather than an experiment.

Pointing the phone and reading the sky

The core idea is live identification. You raise the phone, aim it at the sky, and the app matches what is overhead in real time, so the screen becomes a labeled map of the sky in front of you. It is the kind of feature that rewards curiosity: step outside, point, and learn a handful of names in a few minutes.

The simulation is not limited to this moment. You can set any date, time and location and see how the sky looked or will look from there, which is useful for planning an evening or understanding why a constellation sits where it does. The app also simulates landscape and atmosphere, including sunrise, sunset and atmospheric refraction, so the horizon and the way objects sit near it are represented rather than ignored.

For anyone who finds the night sky hard on the eyes, there is a red night mode intended to preserve your adaptation to darkness. That is a small detail, but it is the sort of thing that separates an app made with actual observing in mind from a generic star chart.

Constellations, planets and satellites

Beyond identifying individual points, Stellarium offers constellation shapes and illustrations drawn from many sky cultures, so you can see how people in other regions of the planet have grouped and pictured the same stars. It is a feature that adds a cultural dimension to what could otherwise be a purely technical chart, and it is the part I would expect to appeal to teachers and parents as much as to hobbyists.

The app also tracks artificial satellites, including the ISS, which gives the sky a moving element alongside the fixed stars. For the solar system, it provides 3D rendering of the major planets and their moons, so you can look at these bodies as objects rather than dots. Deep sky objects are part of the package too: nebulas, galaxies and star clusters, with realistic Milky Way imagery that you can zoom into.

The base app is not trying to show everything. Its stated limit is magnitude 10, which covers a great deal of what a beginner will care about but stops well short of the faintest objects. That is where the paid upgrade comes in, and it is the main division in the app.

What the Plus upgrade adds

Stellarium is free to download and shows no ads, but it does offer in-app purchases that unlock Stellarium Plus. The central difference is depth: the base version goes to magnitude 10, while Plus reaches magnitude 22, a far fainter limit that brings a much larger catalog into view.

According to the developer, the star map draws on the Gaia DR3 catalog, which holds over 1.81 billion stars, plus every known planet, moon and comet, roughly 10,000 asteroids, and a shared catalog of more than 2 million nebulas and galaxies. The upgrade also lets you magnify detailed views of planets and deep sky objects.

Two features in Plus matter for people who observe away from home. When there is no connection, the app relies on a reduced catalog, with 10,000 asteroids, 2.3 million deep sky objects and 3 million stars, which works well for observing off the grid. Second, it can control a GOTO telescope over Bluetooth or Wi-Fi using the NexStar, SynScan or LX200 protocols, and it includes advanced tools for predicting when an object will be observable and when it will transit.

If you only want to know what that bright thing is, the free version covers the ground. If you are chasing faint galaxies or driving a motorized mount, the upgrade is the part of the app that matters.

How it compares with other ways of stargazing

The obvious alternative is a printed star chart or a planisphere. Those cost little and never need charging, but they cannot tell you what is directly overhead at this second, and they do not simulate a specific date and location for you. Stellarium's live identification is the reason to carry a phone instead.

Another option is a dedicated planetarium program on a computer. Those can be powerful, and the desktop Stellarium is a well known example, but they keep you indoors at a desk rather than standing under the sky. This app's value is that it puts a comparable kind of simulation in your hand, with the pointing gesture as the interface.

There are also general astronomy apps and telescope-specific control software. The distinction here is the combination: identification, simulation, sky cultures, satellites, 3D planets and, in Plus, telescope control and offline field data in one place. A dedicated mount app may drive hardware well, but it will not teach you the constellations, and a simple star chart will not drive your mount.

What to weigh before installing

The main consideration is the split between free and paid. The free download is genuinely useful for identifying bright objects and learning the sky, but the fainter catalogs, the offline data set and the telescope control sit behind the in-app purchase. If your interest is casual, that may never matter; if your interest is deep, you should expect to pay at some point.

The second is the nature of the app itself. It is a reference and simulation tool, not a course. It will show you the sky and label it, but it does not set out a curriculum or test you. People who learn best by being told what to look at next may want to pair it with a guide or a club.

Finally, the app was updated in September 2026, with the most recent changes fixing cases where in-app purchases were not being recognized and adding other bug fixes. That is a small but relevant note for anyone considering the Plus upgrade, since it addresses the purchase flow directly.

A planetarium worth carrying outside

I would recommend Stellarium to anyone who wants a straightforward answer to the question of what is in the sky tonight. It is free, it carries no ads, it is rated for all ages, and its live identification is the fastest route from curiosity to a name. The 4.8 average across more than 337,000 ratings suggests that approach has worked for a great many people.

For beginners, families and casual observers, the free version is likely to be enough for a long time. For amateur astronomers with a telescope, the Plus upgrade is where the app becomes a serious tool, with faint catalogs, offline field data and mount control through the common protocols.

The one thing to keep in mind is that the deepest features are paid. If you go in expecting the free app to show you everything the catalogs contain, you will be disappointed; if you treat the upgrade as the price of a field-ready planetarium, the arrangement is reasonable.

What's new in version 1.16.8

This update brings the following improvements: - Fix in-app purchases sometimes not being recognized or acknowledged - Many other bug fixes and improvements We are happy to hear from you and get your feedback!