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.
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.
- 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
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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.
Sail Scan
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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
Verdict
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
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.
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.
| Parameter | Sea Current Measure Tool | Sail Scan |
|---|---|---|
| Price | $19.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 15 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Master Sailing jdoo | Nate McGuire |
In-app purchases
Sea Current Measure Tool
No in-app purchases
Sail Scan
No in-app purchases
Questions
Is Sea Current Measure Tool free?
Is Sail Scan free?
Do Sea Current Measure Tool or Sail Scan have ads?
Which is updated more often, Sea Current Measure Tool or Sail Scan?
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