Comparison

Alert Diver vs Scuba Dive Signals

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

Head to head
About

Alert Diver

Explore dive industry insights, research, and safety information. Discover underwater photography, travel destinations, and marine environmental topics. This app provides valuable content for divers and enthusiasts.

Highlights
  • Dive industry research
  • Medical information
  • Dive safety guidelines
  • Underwater photography
  • Dive travel guides
  • Marine environmental topics
Features
Read full description

Alert Diver magazine, the dive industry’s leading publication, features DAN’s core content of research, education, medical information and dive safety. In addition, Alert Diver showcases underwater photography, dive travel and marine environmental topics. Divers Alert Network (DAN) is a nonprofit, 501(c)(3) dive safety organization. DAN's mission is to help divers in need of emergency medical assistance and to promote dive safety through research, education, products and services. Published quarterly, Alert Diver is a benefit to members of DAN; its companion website, AlertDiver.com, is available to all. If you are a current DAN member (DAN America region), everything offered in this app is included in your membership and free to you!

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.

Screenshots

Alert Diver4 screens
Scuba Dive Signals4 screens

Verdict

The call

The clearest difference is review sentiment: Scuba Dive Signals at 100% against Alert Diver's 25%. Scuba Dive Signals also leads on rating (5.0 vs 4.0) and monetization model (free vs free with in-app purchases). Alert Diver's advantage is update cadence (every 6 months vs every 42 months) and iOS requirement (11.0 vs 15.0). On price, ratings volume, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Scuba Dive Signals holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 25% of Alert Diver's written reviews are positive against 100% of Scuba Dive Signals's.

UpkeepUpdate frequency

Alert Diver ships an update every 6 months, Scuba Dive Signals every 42 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
Alert Diver versus Scuba Dive Signals: the parameters behind the verdict, then further details
ParameterAlert DiverScuba Dive Signals
PriceFreeFree
Rating4.0 (4 ratings)5.0 (3 ratings) — better
Positive reviews25.0% of reviews100.0% of reviews — better
Number of ratings4 — better3
Update frequencyEvery 6 months — betterEvery 42 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size92 MB3 MB
Age rating4+4+
DeveloperDivers Alert NetworkEric Hamiter

Customer experience

Alert Diver

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews36 reviews
Positive25.0%
Neutral8.3%
Negative66.7%

Scuba Dive Signals

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Alert Diver

No in-app purchases

None

Scuba Dive Signals

No in-app purchases

Questions

Is Alert Diver free?
Alert Diver is free to download, with no in-app purchases.
Is Scuba Dive Signals free?
Scuba Dive Signals is free to download, with no in-app purchases.
Which has better reviews, Alert Diver or Scuba Dive Signals?
Scuba Dive Signals is rated higher. Alert Diver averages 4.0 out of 5 from 4 ratings, while Scuba Dive Signals averages 5.0 from 3 ratings.
Do Alert Diver or Scuba Dive Signals have ads?
Neither Alert Diver nor Scuba Dive Signals shows ads.
Which is updated more often, Alert Diver or Scuba Dive Signals?
Alert Diver ships an update every 6 months, and Scuba Dive Signals every 42 months. Most recently, Alert Diver was updated on November 6, 2026 and Scuba Dive Signals on November 3, 2026.

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