Triatlas 4+


    • 4.8 • 14 Ratings
    • Free



The Triatlas app contains the most detailed, speedy star chart available for smartphones and tablets!

- Stars up to mag 12.6
- Galaxies up to mag 15.5 (PGC). 37000 in total!
- 1200 planetary nebulae
- 1800 open clusters, all globulars
- Others: SH-2, RCW,LDN / Barnard
- Double stars whose main star is brighter than 11th magnitude (35,000 double stars)
- Variable stars whose maximum reaches the 12.5 magnitude (29,000 variable stars)

- Flexible Night vision mode
- Landscape-portrait mode
- Flip and mirror (Supporting telescope orientation)
- Chart-to-chart navigation using the black corners.

Based on the charts made by Jose Torres. Used with permission.

What’s New

Version 1.2.1

This app has been updated by Apple to display the Apple Watch app icon.

iOS 8 ready
UI optimizations

Ratings and Reviews

4.8 out of 5
14 Ratings

14 Ratings

Astrosketcher ,

Excellent App!

The Triatlas is one of my favorite sky atlases. I like having the app so I only need to print the 50 or so pages of the "A" set, and I can access the other two sets when I am outside with my telescope. I really enjoy being able to turn the brightness way down and turn on red on black to preserve night vision. After using it, I tend to wait a while before starting a new sketch for my eyes to get rid of the faint light.

FrankenCub ,

Very useful app

I haven't had a chance to use this next to my scope yet, but from what I've been checking it out in the house waiting for clear weather, it looks great. Be nice when I want some simplicity along side of SkySafari Pro.

AstroPaul ,

Like having Uranometria in your pocket! Amazing! Several suggestions...

Brilliantly designed; a tour de force in bringing the classic star atlas to the iPhone/iPad.

Has nice touches such as a brightness slider & night mode always present discretely at the bottom left of the page. Moving from chart to chart is well designed with buttons on the edges of the screen to go to the adjacent ones. Perhaps the next iteration of the app can add a feature whereby if you swipe at the edge of the screen it will move to the adjacent chart.

Pinch-zooming works well, too.

Another suggestion: Please shift the main index page over by a chart or two. One of the first things I looked for was the Virgo galaxy cluster-- and it's hard to find! You need a chart centered on the space between Virgo and Leo-- and that area of the sky needs to be somewhere other than buried at the absolute right side end of the scrolling index big chart-- and even there it's impossible to tell where to tap!

I would love to see a colors option whereby one could set the colors of different types of DSOs--galaxies in, say, blue; globulars in yellow, star clusters in orange, etc. That would make this even more usable.

In any event, any serious amateur astronomer would do well to download this app--and being free--why not?!

App Privacy

The developer, DDQ, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

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