When comparing Star Walk 2 vs SkySafari 4 , the Slant community recommends Star Walk 2 for most people. In the question“What is the best stargazing app for Android?” Star Walk 2 is ranked 2nd while SkySafari 4 is ranked 6th. The most important reason people chose Star Walk 2 is:
Instead of only displaying what would be visible to the human eye, Star Walk displays gamma ray, x ray, h-alpha, infrared, microwave, and radio.
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Pros
Pro Displays different parts of the light spectrum
Instead of only displaying what would be visible to the human eye, Star Walk displays gamma ray, x ray, h-alpha, infrared, microwave, and radio.
Pro Users can choose which objects are displayed
Users can toggle which features are activated, such as constellation description or satellite display.
Pro 3D view of stars up close
Just tap on a star and see what it looks like from a closer perspective.
Pro Identifies satellites
For 99 cents, satellites can be tapped for identification. This app contains information on over 9000 satellites.
Pro Contains information about all the planets
Star Walk 2 attempts to give users a comprehensive view of all the things that are currently happening in space, this includes events at other planets. For instance, it displays the angle of rotation around the sun, sunrise, sunset, and length of day on that particular planet.
Pro Adds illustrations over feed from camera
Instead of just displaying a feed of what the sky should look like when the device is aimed in different directions, Sky Walk paints stars, constellations, and satellites over real time images taken from the device's camera.
Pro Shows smaller objects
Users can view asteroids, satellites, comets, and meteor showers with information included.
Pro Detailed search function
Objects can be found according to name, magnitude, number, Ra, and other attributes.
Pro Highly informative
The app has historical mythological and scientific information on hundreds of objects. Over 120,000 stars can be viewed, near star clusters, nebulas, galaxies, and major planets and moons in our solar system.
Pro Can simulate changes of celestial bodies over time
The app is capable of simulating movement up 100 years in the future and past.
Pro Adds a subscription to SkyWeek, Sky & Telescope
SkyWeek, Sky & Telescope's subscription inform of upcoming eclipses and meteor showers.
Pro Various events can be animated
Events such as eclipses, meteor showers conjunctions and transits can be animated.
Cons
Con Unstable for many users
Many people who have this app complain that it crashes within seconds of starting.
Con Outdated data base
2016 and 2017 are not in data base. Can't view anything discovered after 2015. Comets like johnson can't be found.
Con Paid Plus or PRO of app only for current version
Payment of Plus or PRO app is active only for current version (f.e. v.5). Next version (v.6) has to be paid again.
Con Might overwhelm a casual stargazer
There's a lot of information and functionality in this app that might be a bit too much for a beginner astronomy enthusiast.