Comparison

NavCalc Dynamic vs Agga

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

Head to head
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.

About

Agga

Features
Read full description

Okkar markmið er að nútímavæða öryggisstjórnun til sjós með nýsköpun og stafrænum lausnum í samvinnu við íslenska sjómenn/sjávarútveg og gera öryggismál sjómanna eina af grunnstoðum í kísildal íslensks sjávarútveg með nýtingu stafrænna lausna, tækni og íslensku hugviti.

Screenshots

NavCalc Dynamic1 screens
Agga4 screens

Verdict

The call

The clearest difference is iOS requirement: NavCalc Dynamic at 13.0 against Agga's 15.1. On price, update cadence, 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.

UpkeepUpdate frequency

NavCalc Dynamic ships an update every 6 days, Agga every 2 weeks. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

Scorecard1 real difference · 8 level
NavCalc Dynamic versus Agga: the parameters behind the verdict, then further details
ParameterNavCalc DynamicAgga
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 6 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.0 — better15.1
Further details — not scored
Size15 MB54 MB
Age rating4+12+
DeveloperRichard CraddockAlda Öryggi ehf

In-app purchases

None

NavCalc Dynamic

No in-app purchases

None

Agga

No in-app purchases

Questions

Is NavCalc Dynamic free?
NavCalc Dynamic is free to download, with no in-app purchases.
Is Agga free?
Agga is free to download, with no in-app purchases.
Do NavCalc Dynamic or Agga have ads?
Neither NavCalc Dynamic nor Agga shows ads.
Which is updated more often, NavCalc Dynamic or Agga?
NavCalc Dynamic ships an update every 6 days, and Agga every 2 weeks. Most recently, NavCalc Dynamic was updated on November 3, 2026 and Agga on October 25, 2026.

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