# Zenrain

> Zenrain is a Buddhist sutra rain meditation app for iOS. Ten Mahayana sutras fall like rain in calligraphic script, accompanied by 9 generative real-time soundscapes. Features daily 4-step guided meditation practice with Bodhi tree growth. No ads, no account, fully offline.

Zenrain transforms ancient Buddhist wisdom into an immersive audiovisual meditation experience. Sutra characters drift down the screen in three depth layers at 60fps, creating a living meditation screen where words blur and dissolve into stillness. All soundscapes are synthesized in real time using generative audio algorithms — no pre-recorded files — producing infinite, non-repeating ambient sound with a tiny app footprint.

The app is designed around three principles: audiovisual satori (synesthetic experience through falling text and resonance), daily ritual (structured practice with 4-step guidance and streak tracking), and pure privacy (zero data collection, no accounts, fully offline).

## Core Features

- [Sutra Rain](https://zenrain.uppervoid.app/): 10 Mahayana sutras rendered as falling calligraphic text with 3 depth layers at 60fps
- [Daily Practice](https://zenrain.uppervoid.app/): 4-step guided session — daily verse, breathing exercise, timed meditation, and dedication
- [Soundscapes](https://zenrain.uppervoid.app/): 9 generative real-time soundscapes (temple bells, ocean waves, brown noise, rain, wind, and more) with built-in mixer
- [Sutra Library](https://zenrain.uppervoid.app/): 10 Mahayana classics in bilingual (English/Chinese) reader with adjustable font size
- [Bodhi Tree](https://zenrain.uppervoid.app/): Growth system tied to daily practice completion — visual progress tracker
- [Immersive Mode](https://zenrain.uppervoid.app/): Distraction-free full-screen meditation experience (Pro)
- [Sleep Mode](https://zenrain.uppervoid.app/): Gentle wind-down experience for bedtime (Pro)

## Sutras Included

Heart Sutra, Diamond Sutra, Great Compassion Mantra, Lotus Sutra, Platform Sutra, Amitabha Sutra, Medicine Buddha Sutra, Avatamsaka Sutra, Surangama Mantra, Great Compassion Repentance. Free tier includes Heart Sutra, Diamond Sutra, and Great Compassion Mantra.

## Pricing

- Free: 3 core sutras, daily practice, Bodhi tree, basic soundscapes, 7-day history
- Pro Monthly: $2.99/month — all 10 sutras, 9 soundscapes with mixer, immersive mode, sleep mode, full stats
- Pro Annual: $19.99/year — same as Pro Monthly

## Technical Details

- Platform: iOS 17.0+ (iPhone)
- Languages: English, Simplified Chinese
- Privacy: Zero data collection, no analytics, no tracking, all data stored locally on device
- Offline: Fully functional without internet connection
- Audio: All soundscapes generated algorithmically in real time — no audio file downloads

## Links

- [Website](https://zenrain.uppervoid.app/)
- [App Store](https://apps.apple.com/app/id6756945441)
- [Privacy Policy](https://zenrain.uppervoid.app/privacy.html)
- [Terms of Use](https://zenrain.uppervoid.app/terms.html)
- [Support](https://zenrain.uppervoid.app/support.html)