Comparison

ESA Instruments 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

ESA Instruments

Features
Read full description

ESA Instruments is the new App from Astra Yacht that transform your iPhone/iPad in a full function marine display. Connect ESA Instruments to an Astra Yacht GAMP (http://www.astrayacht.com/wp/en/shop/multiplexer-gamp-nmea-0183-esa/) and you can visualize every information coming from the boat instruments. Moreover, if you haven't any electronic instruments on board, you can use ESA Instruments App combined with the Astra Yacht box EBI. EBI has an internal GPS at high speed, and it's able to receive wind data directly from the most popular wind sensors both wired and wireless, and it can be connected to 4 other NMEA 0183 sensors (such as speed-depth sensor, electronic compass, AIS, wind sensor). Data from various sensors can be displayed via Wi-Fi directly on Apple devices through the App ESA Instruments that, in addition to the visualization of data in a very light and flexible way, allows you to easily calibrate your sensors thanks to a user friendly settings procedure. With ESA Instruments you can visualize data in various format: - page with a single data ; - page with two data; - page with tree data; - page with four data; - page with analog wind indicator; - page with GPS data; - page with graphic wind history (5', 10', 20' or 60' time period). in every page you can select the data you want to display in a very simple way.

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

ESA Instruments4 screens
Sail Scan4 screens

Verdict

The call

The clearest difference is update cadence: Sail Scan at daily against ESA Instruments's every 6 months. On price, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

ESA Instruments ships an update every 6 months, Sail Scan daily. Both last shipped on September 30, 2026.

Scorecard1 real difference · 5 level
ESA Instruments versus Sail Scan: the parameters behind the verdict, then further details
ParameterESA InstrumentsSail Scan
PriceFreeFree
Update frequencyEvery 6 monthsDaily — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.1 — better
Further details — not scored
Size3 MB30 MB
Age rating4+4+
DeveloperAstra YachtNate McGuire

In-app purchases

None

ESA Instruments

No in-app purchases

None

Sail Scan

No in-app purchases

Questions

Is ESA Instruments free?
ESA Instruments is free to download, with no in-app purchases.
Is Sail Scan free?
Sail Scan is free to download, with no in-app purchases.
Do ESA Instruments or Sail Scan have ads?
Neither ESA Instruments nor Sail Scan shows ads.
Which is updated more often, ESA Instruments or Sail Scan?
ESA Instruments ships an update every 6 months, and Sail Scan daily. Most recently, ESA Instruments was updated on September 30, 2026 and Sail Scan on September 30, 2026.

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