Sync podcasts from iPhone to MP3 swim headphones in two minutes
Turn any document into a two-voice podcast you can listen to on your commute
Stage
Not given
Not given
Founded
Not given
Not given
Based in
DE
Not given
Pricing model
Freemium
Freemium
Pricing
First sync free. Swimcast Plus: $29.99 one-time lifetime purchase.
Free: 3-minute preview of any episode with spoken-intro watermark, no download. Pro: $12/mo for unlimited episodes up to 50,000 characters, MP3 downloads, no watermark, priority queue. Credit pack: $9 for 20 full episodes up to 50,000 characters with MP3 downloads, credits never expire, no subscript
Key features
Find and add podcasts
Choose episodes on iPhone
Sync MP3 episodes to compatible swim headphones
Set playback order before swimming
Works with Shokz OpenSwim, OpenSwim Pro, H2O Audio, FINIS Duo
No Bluetooth required
Two-minute setup
Paste text, PDF, DOCX upload, or article URL input
Two-host conversational format with Q&A dialogue
Self-hosted speech synthesis models
5–15 minute episodes with chapters and synced transcript
MP3 download capability on Pro plan
Free 3-minute preview on any document
Priority queue processing for Pro subscribers
Support for documents up to 50,000 characters
No watermark on Pro and Credit pack episodes
What makes it different
Direct iPhone to headphone sync without laptop needed
Built specifically for MP3 swim headphones where Bluetooth fails underwater
Designed for quick two-minute pre-swim preparation
Free first sync to test compatibility before paid option
Set and review playback order on iPhone before syncing
Two-voice dialogue format keeps listeners engaged better than monotone reading
Self-hosted voice models optimized specifically for natural Chinese and Japanese pronunciation
No per-character pricing, so long documents are voiced end-to-end without truncation
Automatically rewrites source documents into conversational format
Credit packs never expire, providing flexible usage without subscription commitment
Swimcast
DuoCast