GPU-accelerated HDR nebula fly-through screensaver
About this app
A deep-space nebula rendered in real-time volumetric raymarching on the GPU. The camera flies through translucent clouds of emissive gas, sculpted by a tiling 3D noise field with Worley erosion and lit by gradient relief, shell halos, and ionization-front rims.
The palette centres on deep violet and indigo, with magenta and cool-blue accents. Foreground masses occlude background stars with true depth. Dense star clusters glow as pointillistic distant galaxies, and the brightest stars throw subtle aperiodic HDR flares with four-point diffraction spikes.
A split-resolution pipeline keeps stars pin-sharp at native resolution while the gas runs at an adaptive lower resolution. Each screensaver activation randomises the camera path, nebula formation, and star field so no two sessions look alike.
Features: - Volumetric raymarching through a 3D noise field - HDR output with automatic SDR fallback - Configurable render resolution, frame rate, and zoom speed - Burn-in safe: every element moves or cross-fades, so no pixel holds a static image - No network access, no ads, no tracking
Optimized for the NVIDIA Shield and HDR displays, but runs on any Android phone or TV with a sufficiently powerful GPU.
Licensed under GPL-3.0-only, by Jordan Adema.
What's New in v4.9.0
Imported from the F-Droid repository index.
- Rare events land, warm scenes glow:
- • Nova: once in a rare while, one star swells to a brilliant point, holds, and fades white to amber over half a minute
- • Showpiece galaxies: occasionally a much larger galaxy with a warm core and dust lane drifts through
- • Galaxies now hang nearly still while stars stream past (they're at infinity), and the common smudges gained real structure
- • Warm scenes glow amber-gold instead of muddy brown
- • Star-forming cores actually ignite now
Version history
Jul 14, 2026 · 0.1 MB · Android API 21–35 · code 28
Imported from the F-Droid repository index.
- Rare events land, warm scenes glow:
- • Nova: once in a rare while, one star swells to a brilliant point, holds, and fades white to amber over half a minute
- • Showpiece galaxies: occasionally a much larger galaxy with a warm core and dust lane drifts through
- • Galaxies now hang nearly still while stars stream past (they're at infinity), and the common smudges gained real structure
- • Warm scenes glow amber-gold instead of muddy brown
- • Star-forming cores actually ignite now
SHA-256 7d19026e6eb2df2052d4e4a43d862840e0905671adeebda87e8e3ac338898fa0
Jul 5, 2026 · 0.1 MB · Android API 21–35 · code 27
Imported from the F-Droid repository index.
- The "magical sky" release — a full visual overhaul of the star field and nebula:
- • Star-forming cores: the densest gas now ignites into brilliant white-pink hearts (HDR)
- • Realistic star colors: blackbody sequence, bright stars skew blue-white, faint ones warm
- • Distant galaxies: tiny inclined spirals drift among the stars
- • Star flares are now rare, long events instead of constant texture
- • Faint milky-way band gives empty sky depth and resolves into star grain
SHA-256 389fab7029331a342481e56a42f56dfbcfed3cdfccde16e2cd76ea8b7395b1c8
Jun 30, 2026 · 0.1 MB · Android API 21–35 · code 26
Imported from the F-Droid repository index.
- Phone polish and burn-in fixes. Stars are sized for high-density phone screens, the faint sprinkle layer now cross-fades so no pixel stays lit, the settings layout is fixed on both phones and TV, and HDR highlights always target the display's full brightness. Shield/TV output is unchanged.
SHA-256 9e259ac408bf36e961fe2ee3fcf13e3c05de757a3e843e8bd9af26f42c8250e5
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.jordanadema.nebula is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 4.8.0 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Nebula HDR screensaver first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Nebula HDR screensaver, and a listing is removed when the evidence for it stops holding up.
Get Nebula HDR screensaver
Every source we list for com.jordanadema.nebula is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
7d19026e6eb2df2052d4e4a43d862840e0905671adeebda87e8e3ac338898fa0
Signing certificate
878ec6cee21525482bd880c97bde14e1be71a27d581502f7326457daf6693639
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.