Comparison

Scuba Dive Signals vs Simple Nitrox

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

Head to head
About

Scuba Dive Signals

Access a comprehensive list of underwater hand signals for safe scuba diving communication. Includes a quiz feature to test your knowledge of signals recognized by major training agencies.

Highlights
  • List of recognized dive hand signals
  • Signals from PADI, NAUI, SSI
  • Quiz feature to test knowledge
  • Safety communication focus
  • Creative Commons licensed images
Features
Read full description

Access a handy list of dive signals to safely communicate underwater while scuba diving. This contains a list of hand signals generally recognized by the Recreational Scuba Training Council and its member agencies (PADI, NAUI, SSI, and more). Once you've studied up, you can quiz yourself on what you've learned-- the app will show a series of five dive signal descriptions and give you a choice of four different pictures-- only one will match, so choose wisely! As always, safety is paramount when scuba diving, so be sure you are your diving partners are clear on their meanings before diving. The author of this app does not assume and hereby disclaims any liability to any party for any loss, damage, or injury, including death, caused by errors or omissions, whether such errors or omissions result from negligence, accident, or any other cause. The information in this app is meant to supplement, not replace, proper scuba diving training. Scuba diving poses some inherent risk. Never dive without proper training and certification! The images used in this app are used via the Creative Commons Attribution-Share Alike licenses, and are credited as follows: Creative Commons Attribution-Share Alike 3.0 Unported license (https://creativecommons.org/licenses/by-sa/3.0/deed.en): Original author: Thomei08 Dive hand signal-cold.plain.svg Dive hand signal-look.plain.svg Dive hand signal-tink.plain.svg Dive hand signal-ear.plain.svg Original author: Peter Southwood Dive hand signal OK 1.png Dive hand signal OK 2.png Dive hand signal OK surface 1.png Dive hand signal OK surface 2.png Dive hand signal Stop.png Dive hand signal Turn Around.png Dive hand signal Which Way.png Dive hand signal Boat.png Dive hand signal Buddy up.png Dive hand signal Hold on to each other.png Dive hand signal Lead and follow.png Dive hand signal Level out.png Dive hand signal Slow down.png Dive hand signal Give me air.png Dive hand signal Emergency Out of air.png Dive hand signal Help surface 1.png Dive hand signal Dont know 1.png Dive hand signal Danger there.png Dive hand signal Pressure.png Dive hand signal Bubbles.png Dive hand signal Cut.png Dive hand signal Safety stop.png Dive hand signal Entangled.png Dive hand signal Silt.png Dive hand signal Cramps.png Dive hand signal Reserve.png Dive hand signal Time up.png Dive hand signal Fetch surface 1.png Dive hand signal Turn dive.png Dive hand signal Stuck.png Creative Commons Attribution-Share Alike 4.0 International license (https://creativecommons.org/licenses/by-sa/4.0/deed.en): Original author: Peter Southwood Dive hand signal Ascend to stop.png The licensors do not in any way endorse the author of this app or usage.

About

Simple Nitrox

Features
Read full description

Simple Nitrox provides an easy to use and very visible calculation of Maximum Operating Depth for scuba diving. The most appropriate nitrox mix can also be calculated for a planned depth. Widgets can be added to the Home Screen for up to 5 tanks for easy access to the values for previously analysed tanks and the application. Supports metric and imperial, and o2 up to 99%.

Screenshots

Scuba Dive Signals4 screens
Simple Nitrox3 screens

Verdict

The call

The clearest difference is in-app purchases: Scuba Dive Signals at none against Simple Nitrox's 1. Scuba Dive Signals also leads on device support (3 vs 1). On price, update cadence, ads and iOS requirement 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

Both are free to download. Simple Nitrox sells 1 one-off in-app purchase. Scuba Dive Signals asks for nothing beyond the download.

UpkeepUpdate frequency

Scuba Dive Signals ships an update every 42 months, Simple Nitrox every 29 months. The most recent releases landed on October 8, 2026 and September 12, 2026 respectively.

Scorecard2 real differences · 8 level
Scuba Dive Signals versus Simple Nitrox: the parameters behind the verdict, then further details
ParameterScuba Dive SignalsSimple Nitrox
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 42 monthsEvery 29 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better16.0
Further details — not scored
Size3 MB2 MB
Age rating4+4+
DeveloperEric HamiterSimon Chivers

In-app purchases

None

Scuba Dive Signals

No in-app purchases

1 purchases

Simple Nitrox

One-time1
  • Simple Nitrox Full Access$0.99

Questions

Is Scuba Dive Signals free?
Scuba Dive Signals is free to download, with no in-app purchases.
Is Simple Nitrox free?
Simple Nitrox is free to download, with in-app purchases available.
Do Scuba Dive Signals or Simple Nitrox have ads?
Neither Scuba Dive Signals nor Simple Nitrox shows ads.
Which is updated more often, Scuba Dive Signals or Simple Nitrox?
Scuba Dive Signals ships an update every 42 months, and Simple Nitrox every 29 months. Most recently, Scuba Dive Signals was updated on October 8, 2026 and Simple Nitrox on September 12, 2026.

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