Comparison

Sea Current Measure Tool vs Sail Scan

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

Head to head
About

Sea Current Measure Tool

This tool helps sailors and coaches measure sea current speed and direction directly on the water using an iPhone. It's designed for race preparation and training, using GPS data to calculate water movement from a floating object.

Highlights
  • Measure sea current speed and direction
  • GPS-based current calculation
  • Simple start and stop measurement
  • Store and review measurements
  • Display measurements on map
  • Useful for race preparation and training
Features
Read full description

Measure sea-current speed and direction from your iPhone in minutes—built for sailors, coaches, and race teams. Map readings across the race area, review history, export CSV data, and share measurements with your team for smarter tactical decisions. WHY TIDEMEASURE Even a small current can change boat speed, laylines, mark roundings, and the favored side of the course. TideMeasure turns a simple drift test into a clear speed-and-direction result without specialized hardware. HOW IT WORKS 1. Drop a floating stick or small object into the water. 2. Tap Start as it begins to drift. 3. Retrieve it after a short measurement. 4. Tap Stop to see current speed and direction. FEATURES • Measure current speed and direction using GPS • View results in m/min, m/s, cm/s, or knots • Map measurements across the race area • Review saved measurements and history • Create or join a team and share readings • Select and export measurements as CSV • Continue measuring offline TideMeasure is designed for race preparation, coaching, training sessions, and building a clearer picture of current around the course. Location access is required during measurements and for displaying results on the map. Apple Maps data is used for mapping.

About

Sail Scan

Features
Read full description

SailScan is currently in beta. SailScan turns your iPhone into a sail shape analyzer. SailScan's computer vision reads the trim stripes to measure what your eyes can't quantify. Measurements include: • CAMBER DEPTH — how much shape you're carrying, stripe by stripe • DRAFT POSITION — where the depth sits, front to back • TWIST — how the top opens relative to the boom SailScan works on mainsails and jibs, from small one-design boats to grand prix racers and superyachts. Make real-time adjustments, save your scans, build your library, and start connecting your rig settings to increase speed and progress on the water. WHY IT MATTERS Good trimmers develop an eye over decades. SailScan gives you the numbers behind that eye—so you can repeat fast settings, compare tack to tack, and debrief with data instead of memory. HOW IT WORKS 1. Photograph your sail (main or jib) from below 2. SailScan detects the stripes and calculates shape metrics 3. Review, adjust, and save your scans 4. Compare scans across the day—track every setting change BUILT BY SAILORS SailScan was built by people who race and trim for a living. Join us!

Screenshots

Sea Current Measure Tool4 screens
Sail Scan4 screens

Verdict

The call

The clearest difference is price: Sail Scan at Free against Sea Current Measure Tool's $19.99. Sail Scan also leads on update cadence (daily vs every 3 months) and iOS requirement (15.1 vs 17.0). On 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

Sail Scan is free to download; Sea Current Measure Tool costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Sea Current Measure Tool ships an update every 3 months, Sail Scan daily. The most recent releases landed on September 19, 2026 and September 11, 2026 respectively.

Scorecard3 real differences · 7 level
Sea Current Measure Tool versus Sail Scan: the parameters behind the verdict, then further details
ParameterSea Current Measure ToolSail Scan
Price$19.99Free — better
Rating5.0 (1 ratings) — better
Positive reviews100.0% of reviews
Number of ratings1 — better
Update frequencyEvery 3 monthsDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size15 MB30 MB
Age rating4+4+
DeveloperMaster Sailing jdooNate McGuire

In-app purchases

None

Sea Current Measure Tool

No in-app purchases

None

Sail Scan

No in-app purchases

Questions

Is Sea Current Measure Tool free?
Sea Current Measure Tool costs $19.99, with no in-app purchases.
Is Sail Scan free?
Sail Scan is free to download, with no in-app purchases.
Do Sea Current Measure Tool or Sail Scan have ads?
Neither Sea Current Measure Tool nor Sail Scan shows ads.
Which is updated more often, Sea Current Measure Tool or Sail Scan?
Sea Current Measure Tool ships an update every 3 months, and Sail Scan daily. Most recently, Sea Current Measure Tool was updated on September 19, 2026 and Sail Scan on September 11, 2026.

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