Comparison

Dive Calculator 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

Dive Calculator

This app provides comprehensive scuba diving calculations, including basic, nitrox, and trimix gas mixes. It supports both metric and imperial units, and allows for gas volume and cost calculations for blending and top-ups. Results can be easily copied for documentation.

Highlights
  • Basic, Nitrox, and Trimix calculations
  • Gas volume and cost calculations
  • Top-up and bleed down mix calculations
  • Metric and imperial unit support
  • Oxygen narcotic/non-narcotic selection
  • Copy results to clipboard
Features
Read full description

A wide variety of scuba based calculations for all levels of divers. Basic Calculations Include: -ATA -SAC / RMV rates -Tank volume / Pressure rating -Basic unit conversions Nitrox Calculations Include: -EANx best mix -Integrated top-up and bleed down mix calculations -What if top–up -EANx mix planning Trimix Calculations Include: -Integrated top-up and bleed down mix calculations -What if top–up -Trimix planning -Best Trimix -Heliair All blending and top up pages include gas volume and cost calculations. Trimix gas fill orders can be changed by simply dragging the icons to select the fill order. Oxygen can be selected as narcotic / non-narcotic on the appropriate calculation pages. Results can be copied to the clipboard in a text format for use in E-mails, messages or other forms of documentation. All pages support metric and imperial units. Many pages include both metric and imperial units.

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

Dive Calculator4 screens
Scuba Dive Signals4 screens

Verdict

The call

The clearest difference is in-app purchases: Scuba Dive Signals at none against Dive Calculator's 2. Scuba Dive Signals also leads on rating (5.0 vs 4.7). Dive Calculator's advantage is update cadence (every 12 months vs every 42 months) and ratings volume (26 vs 3). On price, review sentiment, ads and monetization model 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. Dive Calculator sells 2 one-off in-app purchases. Scuba Dive Signals asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Scuba Dive Signals holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Dive Calculator has 26 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Dive Calculator ships an update every 12 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
Dive Calculator versus Scuba Dive Signals: the parameters behind the verdict, then further details
ParameterDive CalculatorScuba Dive Signals
PriceFreeFree
Rating4.7 (26 ratings)5.0 (3 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings26 — better3
Update frequencyEvery 12 months — betterEvery 42 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS6.0 — better15.0
Further details — not scored
Size7 MB3 MB
Age rating4+4+
DeveloperZanthic Automation Inc.Eric Hamiter

Customer experience

Dive Calculator

All ratings24 ratings
Positive91.7%
Neutral4.2%
Negative4.2%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Scuba Dive Signals

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

In-app purchases

2 purchases

Dive Calculator

One-time2
  • EANx Calculations$0.99
  • Trimix Calculations$0.99
None

Scuba Dive Signals

No in-app purchases

Questions

Is Dive Calculator free?
Dive Calculator is free to download, with in-app purchases available.
Is Scuba Dive Signals free?
Scuba Dive Signals is free to download, with no in-app purchases.
Which has better reviews, Dive Calculator or Scuba Dive Signals?
Scuba Dive Signals is rated higher. Dive Calculator averages 4.7 out of 5 from 26 ratings, while Scuba Dive Signals averages 5.0 from 3 ratings.
Do Dive Calculator or Scuba Dive Signals have ads?
Neither Dive Calculator nor Scuba Dive Signals shows ads.
Which is updated more often, Dive Calculator or Scuba Dive Signals?
Dive Calculator ships an update every 12 months, and Scuba Dive Signals every 42 months. Most recently, Dive Calculator was updated on November 6, 2026 and Scuba Dive Signals on November 3, 2026.

Other comparisons