An independent app studio
Calm, private apps for sleep and focus.
ZaynStack makes small, carefully built apps for the quiet moments of the day: settling a baby, winding down at night, getting into focus. No account, no ads, no tracking.
Our apps
One app is ready for launch, and more are on the way. Each one does a few things well and keeps your data with you.
White Noise Sleep with AI
Settle your baby with calming sounds and scenes, a sleep timer that fades out, a warm night light for night feeds, and cry detection that plays a soothing sound when your baby stirs. No account, no ads, no tracking.
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Sleep sounds for adults
Soundscapes with an overnight loudness curve: it starts gentle and eases down as the night goes on. A built-in volume ceiling, and nothing to manage in the morning.
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Focus games for adults
Short focus games that end by themselves — three, five or ten minutes. A no-score mode hides every number, and no streak ever nags you back.
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Focus games for kids
Gentle games for ages 4–9, with a grown-up in control: a parent gate sets the time limit, and there are no ads, no in-game currency and no streaks.
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Private by design, in every app
- No account and no sign-up
- No ads, no tracking, no data sold
- Your data stays on your device or in your own iCloud
- Works without sending anything about you to us
We only say what our apps actually do
Every feature on this site is checked against the app itself before we publish it. Our apps offer general tips, not medical advice, and we never claim to cure, treat or guarantee anything.