Comparison

Secret KB vs NavCalc Dynamic

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

Head to head
About

Secret KB

Features
Read full description

Send a normal text to your friend or anyone you want with a private and secret message! With Secret Text Keyboard, you can send secret messages to your friends on iMessage, Messenger, WhatsApp, Skype, Line, Wechat, Gmail, etc. While it seems to be no difference from other texts, a text sent by Secret Text Keyboard contains a secret message that can only be seen by you and the one you send it to. No private message will reveal itself until it is decoded by the recipient, which means your secret will be absolutely safe! Download Secret Text Keyboard now and feel free to convey your secrets! Here is how Secret Text Keyboard works as to: -Send A Secret 1. Install Secret Text Keyboard and allow full access. 2. Switch to Secret Text Keyboard and enter your secret message. 3. Tap the Encode button to make it seem like a normal text. 4. Tap send as usual. -Decode A Secret 1. Install Secret Text Keyboard and allow full access. 2. Copy the secret message you've received from your friend. 3. Tap the Decode button to decode that secret. About Allowing Full Access: Allowing full access does not grant us access to other keyboards that you have, except this Secret Text keyboard. Full access is necessary for encoding and decoding secret messages. We do not read, record or transmit anything you type. Secret Text Keyboard will be used strictly for entertainment purposes only.

About

NavCalc Dynamic

This app calculates the course and speed needed to counteract current and wind effects for navigation. It visually displays these calculations on a compass rose, dynamically updating as parameters change. Useful for learning and solving real-world sailing problems.

Highlights
  • Calculate Course to Steer (CtS)
  • Calculate Speed over Ground (SoG)
  • Visual compass rose display
  • Dynamic parameter updates
  • Magnetic variation input
  • Leeway and wind direction input
Features
Read full description

NavCalc is a simple navigation calculator. Given a desired heading, boat speed, and the set and drift of current, NavCalc will display the Course to Steer (CtS) and Speed over Ground (SoG) that will be achieved on that course given the current. NavCalc draws a neat little picture of the heading, current vector, and course to steer on a 360º compass rose which includes both degrees True and Magnetic (if you enter a Magnetic Variation). NavCalc also allows you to enter degrees of leeway and wind direction, and will take leeway into account when calculating the CtS. NavCalc will dynamically update the drawing as you change any of the parameters (heading, boat speed, current set or drift, variation). NavCalc can be used to solve navigation problems like the ones you might find on the tests for Coastal Navigation courses from US Sailing or ASA. It’s also useful for building intuition about how current affects your boat’s course and speed over ground (or velocity made good) since it updates dynamically as you change any parameter.

Screenshots

Secret KB4 screens
NavCalc Dynamic1 screens

Verdict

The call

The clearest difference is price: NavCalc Dynamic at Free against Secret KB's $0.99. On update cadence, ads, in-app purchases 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

NavCalc Dynamic is free to download; Secret KB costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Secret KB ships an update every 10 days, NavCalc Dynamic every 6 days. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

Scorecard1 real difference · 8 level
Secret KB versus NavCalc Dynamic: the parameters behind the verdict, then further details
ParameterSecret KBNavCalc Dynamic
Price$0.99Free — better
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 10 daysEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.013.0 — better
Further details — not scored
Size6 MB15 MB
Age rating4+4+
DeveloperAsadullah JamadarRichard Craddock

In-app purchases

None

Secret KB

No in-app purchases

None

NavCalc Dynamic

No in-app purchases

Questions

Is Secret KB free?
Secret KB costs $0.99, with no in-app purchases.
Is NavCalc Dynamic free?
NavCalc Dynamic is free to download, with no in-app purchases.
Do Secret KB or NavCalc Dynamic have ads?
Neither Secret KB nor NavCalc Dynamic shows ads.
Which is updated more often, Secret KB or NavCalc Dynamic?
Secret KB ships an update every 10 days, and NavCalc Dynamic every 6 days. Most recently, Secret KB was updated on October 18, 2026 and NavCalc Dynamic on October 24, 2026.

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