Pro Dive vs Sym Junk
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pro Dive
Read full descriptionHide full description
Pro Dive continuously tracks your depth, time, ascent rate and tissue loading to keep you informed throughout every dive. Real-Time Dive Computer • Certified to EN13319 — the international standard for dive instruments. • Live depth display • No-Deco Limit (NDL) • Decompression ceiling and Time-To-Surface (TTS) estimates • Gradient Factors and multi gas support (Nitrox / Trimix capable engine) • CCR support with fixed PPO2 and Bail Out modes • Ascent-rate tracking with smart averaging • Automatically detects submersion and starts logging • Underwater Compass • Indicates no fly time Decompression Model Built on the Bühlmann ZH-L16C model with gradient factors, Pro Dive continuously updates a full 16-compartment tissue model during your dive — just like a dedicated dive computer. Automatic Dive Logs Every dive is saved automatically and synced to your iPhone: • Full dive profile graph • Max depth, duration, start/end times • Min/max temperature • Location via GPS + reverse geocoding • Notes and dive-day details • All logs stored locally with optional cloud backup (if applicable) Designed for Apple Watch Ultra Pro Dive is built specifically for the Ultra’s: • Depth and water-temperature sensors • Bright always-on display • Large Action Button and crown to quickly select options underwater • Rugged dive-ready design Offline, Reliable, and Fast All calculations run entirely on the watch — no signal required. Your watch keeps logging even if the iPhone is not nearby. For Recreational and Technical Divers Whether you’re practising buoyancy in the pool, exploring a wreck, or building up to technical training, Pro Dive provides a clean, modern interface with professional-grade dive calculations behind it. Privacy Policy - https://www.tec-diver.eu/pro-dive-privacy-policy.html End User License Agreement - Privacy Policy - http://www.tec-diver.eu/easy-deco-privacy-policy.html
Sym Junk
Read full descriptionHide full description
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.
Screenshots
Verdict
The clearest difference is update cadence: Sym Junk at every 3 days against Pro Dive's every 5 weeks. Sym Junk also leads on iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Pro Dive sells 3 in-app purchases, starting at $6.99 per month and Sym Junk sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Pro Dive ships an update every 5 weeks, Sym Junk every 3 days. Both last shipped on September 29, 2026.
| Parameter | Pro Dive | Sym Junk |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 18.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 32 MB | 59 MB |
| Age rating | 4+ | 4+ |
| Developer | Millennium Ltd | Rogier Visser |
In-app purchases
Pro Dive
- Pro Dive monthly$6.991 Month
- Pro Dive anual$59.991 Year
- Pro Dive Lifetime$139.99
Sym Junk
- Divejunk$6.99









