Comparison

MultiDeco vs Deep Tools

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • VPM and ZHL-16 decompression models
  • Support for nitrox and trimix
  • OC and CCR planning
  • Bailout planning
  • Gas blending utility
  • Depth calculation tools
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

MultiDeco4 screens
Deep Tools4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
MultiDeco versus Deep Tools: the parameters behind the verdict, then further details
ParameterMultiDecoDeep Tools
Price$48.99Free — better
Rating3.9 (11 ratings)4.6 (93 ratings) — better
Positive reviews38.9% of reviews50.0% of reviews — better
Number of ratings1193 — better
Update frequencyEvery 3 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615.6 — better
Further details — not scored
Size2 MB12 MB
Age rating4+4+
DeveloperHHS Software Corp.Deep Blue d.o.o.

Customer experience

MultiDeco

All ratings11 ratings
Positive63.6%
Neutral18.2%
Negative18.2%
Written reviews18 reviews
Positive38.9%
Neutral22.2%
Negative38.9%

Deep Tools

All ratings93 ratings
Positive91.4%
Neutral2.2%
Negative6.5%
Written reviews6 reviews
Positive50.0%
Neutral16.7%
Negative33.3%

In-app purchases

None

MultiDeco

No in-app purchases

3 purchases

Deep Tools

Subscriptions2
  • Subscription Monthly$2.991 Month
  • Subscription Yearly3 Days trial$17.991 Year
One-time1
  • Lifetime Subscription$39.99

Questions

Is MultiDeco free?
MultiDeco costs $48.99, with no in-app purchases.
Is Deep Tools free?
Deep Tools is free to download, with in-app purchases available.
Which has better reviews, MultiDeco or Deep Tools?
Deep Tools is rated higher. MultiDeco averages 3.9 out of 5 from 11 ratings, while Deep Tools averages 4.6 from 93 ratings.
Do MultiDeco or Deep Tools have ads?
Neither MultiDeco nor Deep Tools shows ads.
Which is updated more often, MultiDeco or Deep Tools?
MultiDeco ships an update every 3 months, and Deep Tools every 6 weeks. Most recently, MultiDeco was updated on September 19, 2026 and Deep Tools on September 15, 2026.

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