Deep Tools vs Saline
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Deep Tools
This comprehensive dive toolkit helps recreational, advanced, and technical divers plan dives, log underwater adventures, and blend gases. It offers advanced planning tools, dive computer import, and essential calculations for safe and efficient diving.
- Advanced Deco Planner
- Dive Log with Shearwater import
- Gas Blender for Trimix/Nitrox
- Maximum Operating Depth (MOD) calculator
- No Decompression Limit (NDL) tracking
- Metric and Imperial units
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The Complete Dive Toolkit Deep Tools is a must-have application for recreational, advanced, and technical divers. Whether you are learning to dive, planning complex decompression dives, or logging your underwater adventures, Deep Tools provides reliable tools you can trust. Import dives directly from your Shearwater dive computer, plan dives using the advanced Deco Planner, or use the app as a practical learning aid during your dive training. Tools included: - Maximum Operating Depth (MOD) - Oxygen Partial Pressure (ppO₂) - Equivalent Air Depth (EAD) - Equivalent Narcotic Depth (END) - Equivalent Air Density Depth (EADD) - No Decompression Limit (NDL) - Best Trimix for depth - Best Nitrox for depth - Gas consumption and density - Lift bag calculator Dive Log: * - Import dives from Shearwater dive computers (Petrel, Perdix, NERD, Teric, etc.) - Log dive sites with name, coordinates, and custom tags - Automatically merge dives with short surface intervals - Share logged dives with your buddies - Create local backups or migrate data to another device Advanced Dive Planner: * Plan complex dives with confidence, whether on Open Circuit (OC) or Rebreather (CCR): - Repetitive dive planning - Bühlmann ZH-L16B and ZH-L16C with Gradient Factors - Gas consumption, CNS, and OTU calculations - Visual dive profile, text plan, pressure graph, and slate view - Lost gas planning - CCR Bailout planning - Multi-level dive plans with custom bailout points - Share dive plans with friends Gas Blender: * Prepare accurate breathing gas mixtures: - Trimix and Nitrox blending - Mix to desired gas - Mix with Top-off gas - Continuous flow blending - Estimate gas cost Additional Features - Metric and Imperial units - Adjustable altitude and water type (EN13319, salt, fresh) - Set your altitude - Custom tank / cylinder database * Advanced features are available with a subscription or during the free trial. Special thanks to V. Paul Gordon, Serge Nelissen and Michael Heus for extensive testing and valuable contributions! Terms of Service: https://www.deepblue.si/privacy/terms-of-service.php
Saline
This app helps saltwater pool owners maintain optimal water chemistry. Input your test readings and pool volume to receive precise chemical dosing recommendations, tailored to your specific salt chlorine generator cell. It also calculates important water balance metrics like CSI and borates.
- 7-parameter water testing
- Chemical dosing recommendations
- Salt chlorine generator cell tuning
- Calcium Saturation Index (CSI) calculation
- Borates calculator
- Salt addition calculator
- Offline functionality
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Pay once for Pro. No subscription, no ads, no account. Works offline. Saline is the iOS chemistry assistant for saltwater pool owners. Enter your test readings — free chlorine, pH, total alkalinity, calcium hardness, cyanuric acid, salt, water temperature — and get exact doses scaled to your pool volume. Cell-aware: pick your Hayward TurboCell, Pentair IntelliChlor, or Jandy TruClear and Saline tunes salt targets and recommendations to that specific cell. Features • Brand-cited dose math for BioGuard, HTH, Clorox, Pool Essentials, Leslie's, and generics • Test & Adjust: 7-parameter readings → recommendations with manufacturer-cited dose math • CSI (Calcium Saturation Index) calculation — the metric that predicts SWG cell longevity • SWG-specific FC/CYA guidance — 5 % ratio, not the 7.5 % manual-chlorine rule • Borates calculator — TFP's recommended pH-stabilizer that most pool apps ignore • Salt addition calculator with cell-brand-specific targets • Named-source citations: Trouble Free Pool wiki, manufacturer documentation • Universal app for iPhone and iPad For pool owners who don't want to memorize forum threads. SWG (saltwater) pools 8,000–60,000 gallons. Free download with a 2-day full-feature trial. $6.99 one-time unlocks Saline Pro permanently — no subscription, no ads, no account, no cloud. Privacy: Saline collects nothing. No analytics, no accounts, no network requests. Your settings live on your device.
Screenshots
Verdict
The clearest difference is rating: Saline at 5.0 against Deep Tools's 4.6. Saline also leads on update cadence (every 3 weeks vs every 2 months). Deep Tools's advantage is ratings volume (93 vs 1). On price, ads, in-app purchases and monetization model 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. Deep Tools sells 3 in-app purchases, starting at $2.99 per month and Saline sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Saline holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Deep Tools has 93 ratings behind it against 1, so its average is the more settled of the two.
Deep Tools ships an update every 2 months, Saline every 3 weeks. The most recent releases landed on October 25, 2026 and September 22, 2026 respectively.
| Parameter | Deep Tools | Saline |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (93 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 93 — better | 1 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 13 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Deep Blue d.o.o. | Roman Kopaliani |
Customer experience
Deep Tools
Saline
In-app purchases
Deep Tools
- Subscription Monthly$2.991 Month
- Subscription Yearly3 Days trial$17.991 Year
- Lifetime Subscription$39.99
Saline
- Saline Pro (lifetime)$6.99









