Sym Junk
Set up your rebreather
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
SymJunk is a fast, offline-first companion for configuring your CCR dive
computer and rebreather head over Bluetooth — so you set everything up calmly on
the surface instead of squinting at tiny buttons on the unit.
CONFIGURE EVERYTHING, OFFLINE
• Edit screens, gases, gradient factors, setpoints, deco and more — all on your
phone, no connection needed.
• Save presets per category and pick them with one tap.
• Three colour themes; metric or imperial.
ONE-TAP FLEET SYNC
• Mark your handset, HUD and CCR head, then push your settings to all of them in
a single sync — with a clear before/after overview of exactly what changed.
• The clock and time zone are set correctly on every device.
DIVE LOGS & MAP
• Download your dives and view depth, temperature, pO₂ and tank-pressure
profiles.
• See your dives on a map. Add your own dive-site name and location to any dive
— with type-ahead so your favourite sites autofill.
• Dive-site totals, ranked by number of dives.
OFFLINE MAPS
• Download a dive area for offline use, so the map works with no signal.
REBREATHER TOOLS
• Live CCR-head monitor: cells, setpoint, tank pressures, battery health and
more.
• Vacuum/positive test with an adjustable timer and live loop Δp.
• Calibration guide that follows the head live.
• Step-by-step assembly and calibration checklists.
WAYPOINT PLANNING
• Plan waypoints on a map and upload them to your computer.
PRIVACY BY DESIGN
• No account, no ads, no tracking. Your data stays on your phone. The only
internet use is map tiles and place-name search.
SymJunk is an independent hobby app and is NOT affiliated with, or endorsed by,
Halcyon or Oxygen Scientific. All brand and product names belong to their
respective owners. This is experimental software and not a dive-safety device —
always verify every setting on the dive computer itself and rely on your training
and certified equipment.
Free to use, with an optional one-time Pro upgrade for fleet sync, waypoint
upload and the live head monitor.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Screen sync update
The developer, Rogier Visser, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Rogier Visser
- Size
- 62.1 MB
- Category
- Sports
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 2 more
- English, Dutch, German
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Divejunk $6.99
- Copyright
- © Joep & Rogier Visser