Uncover the fate of humanity's final outpost as you survive and explore a thrilling world of floating islands. Brave the skies on your own or assemble a squadron of friends, and scavenge scrap to engineer and upgrade flying vessels, bringing your airship along for the journey.

Public builds
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Counted once we have watched for 90 days (since 21 Oct 2026)
Distinct builds deployed to a game's public (default) Steam branch, as Steam's client network describes them.
Checked within minutes of each Steam change. Observed since 21 Oct 2026.
Source: Steam client network (PICS), App info, public branch. Full methodology
Latest public build
Build 26345227
Update posts
7 postsPosts announcing an update, tagged or not
Posts in a game's official Steam news feed that announce an update: tagged as patch notes by the developer, or plainly about a patch or a released update.
Source: Steam Web API, ISteamNews/GetNewsForApp. Full methodology
Typical gap between builds
19 hoursMiddle gap across the last 5 builds we saw
| Build | Went live | Patch notes |
|---|---|---|
| 26345227 | None posted | |
| 26330488 | ATMOSFAR EA 1.0-5 released | |
| 26309985 | None posted | |
| 26307447 | ATMOSFAR EA 1.0-4 released and performance inquiries | |
| 26298396 | None posted |
From Steam’s client network, last checked . Builds before 21 Oct 2026, when we started watching, aren't listed. Patch notes are the developer’s update post from an hour before to a day after the build. Not every build gets one. How we count
| Posted | Update |
|---|---|
| 27 Feb 2026 | Demo update: ATMOSFAR SNF 1.0-4 released Patch notes |
| 26 Feb 2026 | ATMOSFAR demo updates! Update |
| 26 Feb 2026 | Demo update: ATMOSFAR SNF 1.0-3 released Patch notes |
| 24 Feb 2026 | Demo update: ATMOSFAR SNF 1.0-2 released Patch notes |
| 23 Feb 2026 | Demo update: ATMOSFAR SNF 1.0-1 released Patch notes |
Steam keeps no record of past build numbers, so before 21 Oct 2026 a game’s update history comes from its own Steam news: posts tagged as patch notes, and untagged posts that plainly announce a patch or a released update. Older posts are still being read in, most played games first. How we count