Gefjon Studio

Own your apps. Don’t rent them.

iPhone apps you buy once. No subscription, no account, no data collected.

Sound Sleep app
SignaturePro app
Parlo app
Invoice Once app
Kept app
1 of 5Get it

Sound Sleep

Sleep sounds & white noise

250+ seamless sounds that play all night, fully offline. 27 free forever.

  1. A1Rain on a tin roof, ocean, fire, fans and 250+ more
  2. A2Mix up to 8 sounds, each with its own volume
  3. A3White, pink and brown noise, binaural beats
  4. A4Sleep timer that fades out, gentle wake-up

What they charge. What we charge.

Simple apps shouldn’t cost rent. Here’s each of ours next to what the big names in its category ask.

Competitor prices from their App Store listings, checked November 2026.

House rules

  1. One price, then it’s yours.Nothing renews. No trial that quietly turns into a charge, and the free part stays free.
  2. Open it and go.No sign-up, no email, no password to forget.
  3. Your stuff stays on your phone.We don’t collect, sell or track anything. This website doesn’t either: no cookies, no analytics.

Everything in the shop

Guides from the counter

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