Expand

1 / 23

About this addon

Enhance Your World!
REX Atmos is the ultimate visual enhancement utility for Microsoft Flight Simulator! Real-time, comprehensive environment enhancements from the ground to the sky. Compatible with everything, including REX products, ActiveSky, Asobo Live Weather, Saved Weather Presets,
Imported Weather Presets and Saved Flights.

Overview
REX Atmos is a comprehensive visual enhancement utility that transforms your entire Microsoft Flight Simulator virtual world, from ground to sky. Featuring real-time rendering and full customization, this add-on lets you tailor the atmosphere, weather, and visuals like never before.

Advanced Controls
With advanced controls over visual parameters, you can create fully customizable and shareable experiences. Plus, with its intuitive, easy-to-use interface, anyone can harness the power of these features without worry.

Compatibility
Compatibility is never an issue, as REX Atmos works seamlessly with Asobo live weather, all weather engines (including REX Weather Force and ActiveSky), and weather presets. Best of all, it’s safe and non-destructive!

Simple & Easy to Use
Our intuitive interface puts simplicity first, letting you enhance your environment with just a few clicks. With a clean, organized layout, REX Atmos makes it effortless to create the perfect look. Dive in and elevate your simulation experience with ease.

Real-Time Rendering
Enjoy instant feedback as you adjust parameters, with real-time rendering that updates your changes on the fly.

Complete Customization
From ground to sky, the level of control is unmatched, offering limitless possibilities for your flight sim visuals.

Ozone Function & Rayleigh Scattering
REX Atmos introduces an advanced ozone function for realistic atmospheric visuals, along with true Rayleigh scattering for stunning light effects that bring the sky and clouds to life.

Safe & Non-Destructive
REX Atmos is built to be non-destructive, preserving your simulator’s core files while you experiment with new visual experiences. When you exit REX Atmos or select RESET within the application, your simulator seamlessly reverts to its original state.

Visual Cloud Enhancement
REX Atmos addresses the occurrence of overly dark cloud coloring (commonly referred to by the community as “ash clouds”) within the simulator, replacing it with beautifully rendered, natural looking clouds that enhance the overall visual realism. You can customize this feature to your liking, just like all the other features in REX Atmos!

Weather Scenarios
Create fully customized weather environments and save your favorite setups and share them exclusively with other REX Atmos users. Once shared, your friends can join in, experiencing the exact same weather during their flights, adding a new level of multiplayer fun and immersion.

Compatibility
No matter if you’re using Asobo live weather, custom created weather, external weather engines like REX Weather Force or ActiveSky, or saved and imported weather presets, REX Atmos seamlessly integrates with your current setup.

Requirements

Flight Simulator:
Microsoft Flight Simulator 2020 / 40th Anniversary Edition

Windows Operating System:
Windows 10, Windows 11

RAM Memory:
16GB or higher

Hard Drive Space:
10GB

Minimum Graphics:
NVIDIA GTX 770 | AMD Radeon RX 570

Internet Connection:
Required for installation, registration, and operation

Changelog

v7.4.2025060312 months ago

FIXED – Save preset where the OK and Cancel buttons remains greyed out. FIXED - User manual desktop link goes to dead URL. FIXED - Lighting under light elements not working.

v7.3.20250503about 1 year ago

REX ATMOS FOR 2020 – TECHNICAL UPDATE 2.0 FIXED – Crash to desktop issue during lengthy flights. FIXED – Metar injection issue. FIXED – Change values not showing in live weather. FIXED – Tree color changes impacting AccuSeason tree colors.

v7.2.20250212over 1 year ago

ADDED – Settings can be saved and restored to local drive. ADDED – Values to all sliders. ADDED – Ability to edit community presets and save changes. ADDED – Ability to bookmark favorite presets. ADDED – Ability to delete or load bookmarked presets. ADDED – Ability to set a bookmarked preset to autoload. ADDED – Function to autoload presets at start up. ADDED – Autoload presets to show in Last Used Window. REMOVED – Reference to REX Circle in settings window.

User Reviews

Yeaarz

Verified

Dec 31, 2025

One of the best upgrades and purchases for FS2020, it's so much better than the default. Get it.

Fritz340

Verified

Aug 3, 2025

Rex Atmos is GREAT! The only thing that prevents 5 stars is that I have to apply the themes every time! Updated my rating! It now automatically applies your preset after opening the app!

Macalou

Verified

Jul 28, 2025

pas possible de telecharger sur windos

BaldoBi95

Verified

Jul 15, 2025

It's very improvemental, it enhance and overhauls a lot the graphics of the program, but It Eats a lot of VRAM and CPU.. even if my system have a Ryzen 9 5900X and a 3060 GPU, the game crashes in the middle of the flight and my PC reboot's... tried without the program, and it's all Ok... Need to be improved by some aspects.. 3 Stars for now

marciojet

Verified

Jul 2, 2025

It has improved a lot, the only flaw is that it is external, it should have a taskbar option

GnZa00

Verified

Jun 26, 2025

MUST HAVE, it can't get clearer than that.

JIN1001

Verified

Apr 26, 2025

Why does my ATMOS prompt 'License Key Issue' when it starts up

SkyWallkerabout 1 year ago

same here. everytime I open the program, I need to insert all the details ( license )

AARAVPILOT

Verified

Apr 18, 2025

nice quality

petergloor

Verified

Feb 16, 2025

Interesting fact for me is that the default values look better than anything else I tried.

Oliver.r

Verified

Feb 15, 2025

amazing, makes FS20 look great and good atmospherics like FS24

MLD_Scenery

Verified

Jan 8, 2025

The app is doing it's thing, but like others, I would like to save one preset, and everytime I start the simulator, the app opens itself (like the Fenix app for example) an applies the saved or last used preset.

JetMore

Verified

Jan 2, 2025

Best mod to exist regarding graphics

stoomlok

Verified

Nov 17, 2024

REX Atmos..... The Home page keep on "initiating" mode and I can't manage to do anything. I don't understand how it to make working . Please help me!

Frietover 1 year ago

I also had this problem. go to https://rexaxis.com for the product management tool. When the product is not active I did a request with a ticket and REX solved my problem

Irvsax

Verified

Oct 31, 2024

I believe this product does do some nice scenic changes. However, the idea that every time you load it you have to manually load a preset on each catagory every time is ridiculous. If you want to use someone else’s preset you have to find it and load it every time you play the game. Makes it more bother than it’s worth and it’s pretty ridiculous this is a thing. I would avoid until they make it more easy to use.

eleven66over 1 year ago

Agree. The User Interface is totally garbage.

bfalcao

Verified

Oct 6, 2024

Great start ! No more pixelated clouds and an amazing environment reality configuration tunning. Love it. But, still, several points to improve: " Fire and forget " approach. The app should start automatically when the MSFS starts, and should automatically load any default Environment/Weather/Atmosphere that we had previously selected. The idea is we don't need to think to activate it and manually select the themes that we had previously created. The same applies for updates. They should be fully automated and silent. The fact that it works with real weather was a deal breaker to buy it, for me.

Cazzie

Verified

Oct 4, 2024

Pretty intuitive, but like REX's Weather Force, the App has to be run simultaneously with the sim, unlike AccuSeason, where you set it and forget it, then close the App. Needs to be made as AccuSeason, set it and forget it, then close the App, like with REX's Global Airport Textures. For the time being save your money. I can highly recommend Global Airport Textures and AccuSeason, but forget Weather Force 2020 and REX Atmos.

stephaneflach

Verified

Oct 2, 2024

"I'm bluuuue dabedee dabedaaaa dabedeeee dabedaaaa...." Well if you like Eiffel 67, then buy this addon. Otherwise, save your money for anything else... ;-) Also like Saurer01 wrote, control window is too small and not scrollable, then lots of features are simply inaccessible...

Yfs2020over 1 year ago

Use ctrl and mouse wheel to zoom out

MSFS 2020

MSFS 2024

REX Atmos

Name: REX Atmos
Brand: REX Simulations
Price: 14.50 EUR
Availability: InStock
Rating: 3.4 (17 reviews)

REX Atmos is a comprehensive visual enhancement utility for Microsoft Flight Simulator, providing real-time environment improvements from ground to sky. It features advanced customization options and an intuitive interface that allow users to tailor various visual parameters effortlessly. With compatibility across multiple weather engines and the ability to create and share unique weather scenarios, REX Atmos aims to elevate the overall flight simulation experience while preserving the integrity of the simulators core files.