Heavens-Above has been the gold standard for satellite pass predictions since the late 1990s. Built by Chris Peat, a German aerospace engineer, the site has earned the trust of thousands of astronomy enthusiasts worldwide with its precise calculations and deep satellite database. For many amateur astronomers, Heavens-Above was the first tool they ever used to predict an ISS flyover, and it remains the go-to reference for experienced observers to this day.
Skytrail is the new challenger. It is a native iOS app designed from the ground up for satellite spotting in 2026, combining pass predictions with augmented reality tracking, launch coverage, achievements, and fleet management. It represents a different philosophy, one that assumes most users will be standing outside with a phone in hand, not sitting at a desktop studying data tables.
So how do these two tools actually compare? We break it down feature by feature, with honest assessments of where each one excels and where it falls short. If you are looking for a Heavens-Above alternative or simply want to understand what each tool brings to the table, this comparison will help you decide.
Overview
Heavens-Above launched in the late 1990s and has been continuously maintained ever since. It is primarily a web application accessible at heavens-above.com, with an official Android app available on the Google Play Store. The site is known for highly accurate satellite pass predictions, detailed sky charts, and a large database that includes everything from the ISS to faint amateur radio satellites. It is completely free to use, with no ads on the main site. The interface is functional but unmistakably dated. It was designed in an era when data density mattered more than aesthetics, and it has not undergone a major visual overhaul since.
Skytrail is a new iOS app launching in 2026. It combines pass predictions with AR sky tracking, launch coverage, crew information, a 3D globe view, push notifications, and an achievements system with 21 awards to earn. It uses a dark glass design language optimized for nighttime use, with a night mode that red-shifts the entire interface for dark adaptation.
Both tools use SGP4 orbital propagation, the industry standard algorithm for calculating satellite positions from Two-Line Element (TLE) data. The underlying math driving their predictions is the same. The differences lie in how they present information, what additional features they offer, and the platforms they support.
Feature-by-Feature Comparison
Here is a side-by-side breakdown of the core features offered by each tool:
| Feature | Heavens-Above | Skytrail |
|---|---|---|
| Platform | Web + Android | iOS |
| Pass Predictions | Yes (excellent) | Yes (excellent) |
| Satellite Catalog | 1,000+ | 2,000+ |
| AR Sky View | No | Yes |
| 3D Globe | No | Yes |
| Push Notifications | No (email alerts only) | Yes |
| Launch Tracking | No | Yes |
| Achievements | No | Yes (21 awards) |
| Fleet / Favorites | Partial (bookmarks) | Yes (with nicknames) |
| Live Activities | No | Yes |
| Crew Tracking | No | Yes |
| Sky Charts | Yes | Yes (AR-based) |
| Night Mode | No | Yes |
| Offline Support | Limited | Yes |
The table tells a clear story: Heavens-Above wins on platform breadth, while Skytrail wins on feature depth and modern mobile experience. Here is how the areas that matter most break down.
Pass Prediction Accuracy
Pass predictions are the core reason anyone uses a satellite tracker, so this is the most important category. Both Heavens-Above and Skytrail use SGP4 propagation with TLE data sourced from Space-Track.org, which is the same data source used by NASA, the U.S. Space Force, and virtually every satellite tracking application on the market.
Heavens-Above has decades of proven accuracy. It has been the reference standard for satellite observers since the late 1990s, and its predictions are widely considered the benchmark that other tools are measured against. Chris Peat's implementation is meticulous, and the site consistently produces reliable rise times, set times, peak altitudes, and magnitude estimates.
Skytrail uses the same orbital mechanics engine and data sources. Because SGP4 is a well-defined algorithm and TLE data is standardized, the raw prediction math produces functionally identical results. Where the two differ is in how they present that information.
Heavens-Above shows more technical detail by default. Its pass prediction tables include apparent magnitude (brightness), angular separation from the sun, and the satellite's position in right ascension and declination. Sky charts show the satellite's path plotted against the star field. This level of detail is invaluable for experienced observers who want to plan observations with precision.
Skytrail takes a different approach by distilling pass data into quality scores, a composite rating that combines elevation, predicted brightness, and pass duration into a single number. A pass rated 9 out of 10 means it will be high in the sky, bright, and long-lasting. This makes it immediately obvious which passes are worth going outside for, without requiring the user to mentally evaluate three or four separate variables.
Both Heavens-Above and Skytrail use Two-Line Element (TLE) data from Space-Track.org and SGP4 propagation. The underlying orbital math is identical. Differences are in presentation and features, not prediction accuracy.
User Interface and Experience
This is where the generational gap between the two tools becomes most apparent.
Heavens-Above uses a web-first design built around text-heavy tables, hyperlinked lists, and static sky charts. The interface prioritizes information density; you can see a week's worth of pass predictions for dozens of satellites on a single page. The Android app mirrors the web experience closely. There are no swipe gestures, no animations, and no attempt at visual polish. For users who grew up with web 1.0 astronomy tools, this is perfectly comfortable. For others, the interface can feel overwhelming.
The learning curve is real. Finding satellite predictions on Heavens-Above requires navigating through nested menus, configuring your location (which is saved but not always intuitive to set up the first time), and understanding terms like culmination altitude and magnitude. None of this is impossible to figure out, but it is not self-explanatory either.
Skytrail is a native iOS app built with Apple's latest design frameworks. It uses a dark glass aesthetic with smooth animations, haptic feedback, and contextual navigation. The home screen adapts to show what matters right now (upcoming passes, active launches, crew updates) rather than presenting a static menu of options. One-handed operation was a design priority, which matters when you are holding your phone up to the sky at night.
Skytrail also includes a dedicated night mode that red-shifts the entire interface. Red light preserves dark adaptation far better than white or blue light, which makes a meaningful difference during extended observing sessions. Heavens-Above's white-background web pages are actively counterproductive for night vision.
For beginners, Skytrail is significantly more approachable. For data-oriented users who want maximum information on screen with no wasted space, Heavens-Above delivers raw detail that Skytrail intentionally abstracts away.
AR Tracking
This is Skytrail's single biggest differentiator, and it takes a completely different approach to the "how do I find the satellite?" problem.
Heavens-Above uses sky charts: circular diagrams showing the satellite's predicted path against a star map, with compass directions and altitude markers. These charts are accurate and useful, but they require the observer to mentally translate a 2D diagram into the 3D reality of the sky overhead. You need to know your cardinal directions, estimate altitude angles, and then scan the correct region of sky. For experienced observers, this is second nature. For beginners, it is a significant source of confusion.
Skytrail offers a full AR sky view. Point your phone at the sky, and the app overlays satellite positions directly onto your camera feed in real-time. A crosshair guides you to the exact spot where the satellite will appear, and you can follow it across the sky as it passes. When the satellite is in your field of view, an "I See It!" button lets you log the sighting with a single tap.
AR tracking removes the guesswork entirely. Instead of translating coordinates, you are simply following an arrow. This is especially valuable for dimmer satellites where the margin for error is smaller. If you are looking at the wrong patch of sky, you will miss a magnitude +4 satellite that you would have easily seen if you knew exactly where to point your eyes.
If you have ever stood outside with a sky chart on your phone, squinting at the screen and then up at the sky, trying to figure out which direction you are facing and where "30 degrees altitude" actually is, AR solves that problem completely.
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Satellite Catalog
Heavens-Above tracks over 1,000 satellites, including a wide range of objects that go beyond the typical spotting targets. Its database includes amateur radio satellites, classified military objects, spent rocket bodies, and other orbital debris that most casual observers would never search for. For users interested in tracking obscure objects or monitoring military satellite activity, Heavens-Above's catalog depth is impressive.
Skytrail tracks over 2,000 visible satellites, curated specifically for spotting. The catalog focuses on objects that are actually bright enough to see with the naked eye or binoculars, which means less time scrolling through lists of invisible debris and more time looking at satellites you can realistically observe.
For context, tools like N2YO track upwards of 20,000 objects if you need full orbital awareness. But for most satellite spotters, people who want to see bright passes of recognizable spacecraft, both Heavens-Above and Skytrail provide more than enough coverage. You are unlikely to exhaust either catalog in years of regular observing.
The practical difference is curation. Heavens-Above gives you access to more obscure objects. Skytrail focuses on showing you the satellites you are most likely to actually see and enjoy spotting.
Launch Tracking
Heavens-Above does not include any launch tracking features. It is purely a satellite prediction and tracking tool. If you want to know when the next SpaceX Falcon 9 is launching or what payload Rocket Lab is deploying this week, you need a separate tool entirely.
Skytrail includes full launch coverage with countdown timers, mission descriptions, provider information, livestream links, and payload details. When a launch deploys new satellites, Skytrail flags them with "NEW" badges so you can be among the first to spot them in orbit. This creates a satisfying connection between watching a launch and then seeing those same satellites pass overhead days later.
If you follow the space industry (SpaceX, Rocket Lab, ULA, Arianespace, ISRO, and others), Skytrail integrates that coverage into the same app you use for satellite tracking. Heavens-Above treats launches as entirely outside its scope.
The Verdict
Neither tool is objectively "better" in all categories. They serve different preferences, platforms, and use cases. Here is a simple framework for deciding:
Choose Heavens-Above if:
- You want a free, proven tool with decades of accuracy behind it
- You use Android or prefer a web-based interface
- You value raw technical data: magnitude, angular separation, RA/Dec coordinates
- You do not need AR tracking, push notifications, or launch coverage
- You are comfortable navigating a text-heavy, data-dense interface
Choose Skytrail if:
- You want a modern, native iOS experience designed for mobile use
- You value AR sky tracking for finding satellites without guesswork
- You want launch coverage, crew tracking, and achievements in one app
- Night mode and dark adaptation matter to your observing sessions
- You want a polished, convenient app with ongoing development
Use both. Many serious satellite watchers use multiple tools, and there is no reason you cannot use Heavens-Above for detailed planning at your desk and Skytrail for in-the-field tracking when you are actually outside. The tools complement each other well. Heavens-Above provides the deep data tables for planning, and Skytrail provides the real-time AR guidance and push notifications for execution.
Heavens-Above has earned its reputation over more than two decades of reliable service. It is a tool that does what it does extremely well and is accessible to everyone. Skytrail represents the next generation of satellite tracking: built for modern smartphones, designed for people who want to look up rather than study tables, and packed with features that simply did not exist when Heavens-Above was created. The best choice depends on your platform, your preferences, and what you value most in a satellite tracking tool.
Frequently Asked Questions
Is Heavens-Above still the most accurate satellite tracker?
Heavens-Above remains extremely accurate and is widely considered the benchmark for satellite pass predictions. However, accuracy in satellite tracking is primarily a function of the algorithm (SGP4) and the data source (TLE data from Space-Track.org), both of which are standardized and available to any developer. Any well-implemented satellite tracker using current TLE data will produce very similar predictions. The differences between tools lie in presentation, additional features, and user experience rather than raw prediction accuracy.
Can I use Heavens-Above on iPhone?
Heavens-Above works in the iPhone's Safari browser at heavens-above.com, but there is no native iOS app. The official Heavens-Above Android app is available exclusively on the Google Play Store and cannot be installed on iOS devices. The web version is fully functional on iPhone but does not support AR features, push notifications, or offline access. If you want a native satellite tracking experience on iPhone, you will need an iOS-only alternative like Skytrail.
Is Skytrail worth trying if Heavens-Above is free?
It depends entirely on what you value. If you primarily need pass prediction tables and are comfortable with a web-based interface, Heavens-Above does the job well. Skytrail offers AR sky tracking, native push notifications, launch coverage, crew tracking, achievements, fleet management with nicknames, a night mode for dark adaptation, and a modern mobile-first design, none of which Heavens-Above has. If those additional features matter to your observing experience, Skytrail is worth trying.
Both Heavens-Above and Skytrail are excellent satellite tracking tools built on the same proven orbital mechanics. Heavens-Above is the established veteran: reliable and packed with data. Skytrail is the modern newcomer: polished, feature-rich, and designed for the way people use their phones today. The good news is that you do not have to choose just one. Whichever tool you use, the important thing is getting outside, looking up, and enjoying the remarkable sight of human-made objects gliding silently across the night sky.