Deco Room: Dive Theory
Diving Tools & Theory
Free · Designed for iPad. Not verified for macOS.
Deco Room is the course theory, planning tools and emergency reference for technical and rebreather divers. It is built for boats and remote sites, where there is no signal.
There is no web page hiding inside this app. Nothing needs a connection to read a second time.
COURSE THEORY
Full written theory for the courses you are training on, in chapters you can read in a sitting rather than a syllabus you scroll past:
• KISS Sidewinder MOD 1 — sidemount closed-circuit rebreather
• Technical Diving Fundamentals — decompression, gas, procedures
• Dive Computers and Decompression Management
Chapters open with a question before they give you the answer, because you remember what you had to reach for. Diagrams, worked examples and interactive widgets are drawn live rather than pasted in as pictures, so they scale with your text size and stay legible on deck in the sun.
PLANNING TOOLS
Calculators that show their working:
• Maximum operating depth, equivalent narcotic depth, best mix
• Gas density against the 5.2 and 6.2 g/L limits
• Surface air consumption and respiratory minute volume
• Rock bottom and minimum gas
• Isobaric counter-diffusion check
• Partial-pressure blending
• CNS oxygen clock
• No-stop planning on ZH-L16C with gradient factors
Every input is a bounded control, so you cannot quietly produce an impossible answer.
THE EMERGENCY CARD
Reachable before you sign in, and it works offline:
• What to do before the call: diver out, flat, warm, oxygen on
• The DAN and local emergency numbers for your region
• An SBAR call script you can read straight down while somebody else asks the questions
• A field guide to recognising what you are looking at
REFERENCE LIBRARY
Once you are enrolled, a shelf of curated diving and hyperbaric literature that opens inside the app, plus an offline search index over the research so you can look something up on a liveaboard.
ACCESS
Anyone can create an account and use the calculators, the schedule and the emergency card. Course theory and the library open once your instructor has enrolled you. These are taught courses, not a subscription.
Deco Room is made by Donarun Das, a technical and rebreather instructor. The numbers in it are the ones taught in the courses.
Not a substitute for training, supervision or medical advice. Decompression diving carries risk that no app removes.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Share a dive straight into Deco Room. From Garmin Dive, or any app that exports a dive log, choose Deco Room in the share sheet and the dive opens in Dive analysis. It works for Garmin .fit, UDDF, Subsurface and Shearwater files.
Several dives from one day now read together. Pick several files at once, or share them one after another: each is added to the dives already on screen, and a repeat dive starts from what the one before left.
When the DCS risk model does not cover a dive, the page now says why instead of showing a button that does nothing.
The developer, donarun DAS, 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 Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Contact Info
- Sensitive Info
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- donarun DAS
- Size
- 55.9 MB
- Category
- Education
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- Copyright
- © 2026 Donarun Das
