MultiDeco vs Deep Tools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MultiDeco
This app calculates dive decompression for technical scuba divers using VPM and ZHL-16 models. It supports various gas mixes, planning methods for open circuit and rebreathers, and includes tools for gas blending and depth calculations.
- VPM and ZHL-16 decompression models
- Support for nitrox and trimix
- OC and CCR planning
- Bailout planning
- Gas blending utility
- Depth calculation tools
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A dive decompression calculator for technical scuba divers. MultiDeco presents the VPM and ZHL-16 decompression model and includes VPM-B, VPM-B/E, ZHL model versions and ZHL-16 + GF. The diver can specify any combination of nitrox or trimix, and as many deco gases as required. Planning methods include both OC and Closed Circuit Rebreather. It includes planning for bailouts with SCR and OC legs in a CCR plan. Includes details of ppO2, END, and gas consumptions. This program includes many of the features from the desktop version such as conservatism adjustments, extended stops, adjustable last stops, the planning monitor system and extensive control over many other planning features. Also included is a set of dive planning tools for calculating best mix, maximum operating depth (MOD), END, EAD and other planning considerations. The Mixer utility for blending nitrox and trimix, is included too.
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 - Calculator for lifting bag 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 - Multiple point dive plan 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 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: http://www.deepblue.si/privacy/terms-of-service.php
Screenshots
Verdict
The clearest difference is price: Deep Tools at Free against MultiDeco's $48.99. Deep Tools also leads on rating (4.6 vs 3.9) and ratings volume (93 vs 11). MultiDeco's advantage is in-app purchases (none vs 3). On update cadence, ads 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
Deep Tools is free to download; MultiDeco costs $48.99 up front. Deep Tools sells 3 in-app purchases, starting at $2.99 per month. MultiDeco asks for nothing beyond the download.
Deep Tools holds the better App Store score, 4.6 against 3.9. That said, the two scores are not equally well evidenced: Deep Tools has 93 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 39% of MultiDeco's written reviews are positive against 50% of Deep Tools's.
MultiDeco ships an update every 3 months, Deep Tools every 6 weeks. The most recent releases landed on September 19, 2026 and September 15, 2026 respectively.
| Parameter | MultiDeco | Deep Tools |
|---|---|---|
| Price | $48.99 | Free — better |
| Rating | 3.9 (11 ratings) | 4.6 (93 ratings) — better |
| Positive reviews | 38.9% of reviews | 50.0% of reviews — better |
| Number of ratings | 11 | 93 — better |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 2 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | HHS Software Corp. | Deep Blue d.o.o. |
Customer experience
MultiDeco
Deep Tools
In-app purchases
MultiDeco
No in-app purchases
Deep Tools
- Subscription Monthly$2.991 Month
- Subscription Yearly3 Days trial$17.991 Year
- Lifetime Subscription$39.99









