SkySafari 4 Versions

SkySafari 4 comes in three versions: Pro, Plus, and Basic. These versions have different features, and different-size databases. All three versions require iOS 7 or later, and are "universal" apps for iPhone, iPad, and iPod touch. The table below lists the main differences between the three versions of SkySafari 4:

App Version

SkySafari 4

SkySafari 4 Plus

SkySafari 4 Pro

App Icon
App Size 78 MB 241 MB 945 MB
Price (USD) $2.99 $14.99 $39.99

Visual Comparison

These images are screen shots from SkySafari running on an iPhone 5. They show an identical region around the Lagoon Nebula (M8) and Trifid Nebula (M20), near the center of the Milky Way in Sagittarius.

This provides a visual comparison of the depth of detail in the stellar and deep sky databases included with SkySafari's Pro, Plus, and basic versions.

Click any image to enlarge.

Database and Computation

Number of Stars 119,940 2,637,791 27,074,634
Star Magnitude Limit ~8.0 ~12.0 ~15.0
Number of Deep Sky Objects 222 31,586 743,500
Deep Sky Magnitude Limit ~10.0 ~15.0 ~18.0
Number of Planets & Moons 34 38 187
Number of Asteroids 121 15,832 627,931
Number of Comets 251 632 3,241
Number of Satellites 205 1,460 1,460
Planetary Position Accuracy 10" - 1' < 0.1" < 0.1"
Number of Horizon Panoramas 3 6 10
Number of Object Descriptions 626 1,476 1,629
Number of Object Images 473 592 865
High Resolution (1024 x 768) Object Images No No Yes
Complete General Catalog of Variable Stars No No Yes

Features, Graphics, and Interface

Compass & Gyroscope Support Yes Yes Yes
Wired & Wireless Telescope Control No Yes Yes
Telescope Equipment Settings No Yes Yes
Custom Observing Lists No Yes Yes
Orbit Solar System Objects No Yes Yes
Orbit Nearby Stars No Yes Yes
Hi-Res Earth, Moon, Mars maps No Yes Yes
Ultra-Hi-Res Moon map No No Yes
Planet & Moon Surface Feature Labels No Yes Yes
Saves, Restores, and E-Mails Settings Yes Yes Yes
Imports Custom Horizon Panoramas Yes Yes Yes
Updates Solar System Orbit Data Yes Yes Yes
Includes Sky & Telescope SkyWeek Yes Yes Yes
Alt-Azimuth ("Local Horizon") Sky Charts Yes Yes Yes
Equatorial ("Star Atlas") Sky Charts No Yes Yes
Ecliptic ("Solar System") Sky Charts No Yes Yes
Galactic ("Milky Way") Sky Charts No No Yes
Coordinate Grids and Reference Lines No Yes Yes
Computation Precision & Precession Settings No Yes Yes
Date, Time, & Coordinate Format Settings No Yes Yes
Computes Conjunctions, Oppositions, Eclipses, Transits Yes Yes Yes
Computes Objects' Angular Separations No Yes Yes