Overlays

Themes you can drop in.

Live preview each overlay below, then download the .nerva-overlay bundle and import it from the desktop app.

Available overlays

Default

Clean, minimal, dark — the Nerva reference theme. Live BPM, status, optional stress meter.

Bundled with the desktop app — no separate download.
Cortisol meter

Classic infographic-style cortisol gauge: 6-segment half-dial with a swinging black needle driven by stress, BPM readout below.

Download Cortisol meter
Cortisol meter (clear)

Cortisol meter without the white card — dial and BPM readout straight on transparent, to drop over gameplay without a visible frame.

Download Cortisol meter (clear)
Tunnel vision

Full-screen stress effect: peripheral darkening, backdrop blur, and radial speed lines breathing at heart-rate tempo. Invisible at rest, intense above 70.

Download Tunnel vision
Piggie

Pixel-art companion that powers up with your cortisol level. Cozy on the eyes, loud on peaks.

Download Piggie

More themes coming — a public marketplace is on the table, no date yet.

Skin, Brand, Signature — three tiers, quote-based, weekday turnaround.