Comparison

SailFlow vs ARMAS

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

Head to head
About

SailFlow

Get hyper-accurate, real-time marine weather forecasts and live wind reports. This app uses proprietary weather systems and integrates public data for detailed wind, wave, tide, and radar information. Customize alerts and track your favorite sailing spots.

Highlights
  • Proprietary Tempest Weather Systems
  • Live wind and current station reports
  • AI-enhanced Nearcast forecasting
  • Radar, satellite, and precipitation maps
  • Tides charts and wave height
  • Customizable wind notifications
  • Nautical charts
Features
Currently charting
Read full description

Whether you’re racing, cruising, day sailing, you need precise sailing forecasts and real-time wind. SailFlow delivers both. Powered by 90,000+ exclusive Tempest Weather Stations and 150,000+ total sources, SailFlow’s weather and wind app delivers unmatched accuracy. With stations on buoys, piers, and key waterfront locations, you get real conditions exactly where you sail. Plan with confidence using our Tempest Rapid Refresh Model combined with government data to deliver industry-leading Nearcast AI predictions. Then go deeper with radar, high-resolution forecast maps, and fully customizable alerts so you never miss a session. Real wind. Better sails. - Coastal observations from proprietary Tempest Weather Systems along with all public domain marine forecasts and reports (NOAA, NWS, METAR, ASOS, CWOP) including all major airports creating over 150,000 unique stations. - Exclusive Tempest Weather Systems deployed at key coastal locations report wind, rain, barometric pressure and more than 24 other weather observations. - Apple Watch compatibility - Live wind from our stations support powerful wind flow visualization – augmented by current station reports with advanced quality control. - Our Proprietary AI-enhanced Nearcast provides enhanced forecasting for temperature, wind gust, speed, direction, humidity, dewpoint, precipitation rate, probability of precipitation, and cloud cover percentage which is perfect for sailing. - Public domain forecast models including High Resolution Rapid Refresh (HRRR), North American Mesoscale Forecast System (NAM), Global Forecast System (GFS), Canadian Meteorological Centre Model (CMC) and Icosahedral Non Hydrostatic Model (ICON). - Create your own favorite station list to keep an eye on your go-to weather stations at all your marine and sailing spots. Check the tides in minutes so you never miss a day on the water. - Maps: Live and Forecasted Wind Map, Forecasted Temperature, Radar, Satellite, Precipitation and Clouds, as well as Nautical Charts. - Free subscription for unlimited wind notifications/alerts with customizable thresholds to email, text, or in-app. - Monitor National Weather Service (NWS) Marine forecasts, high surf warnings, and other to better anticipate waves and current conditions, for safer, more informed decisions on the water. Additional weather parameters: - Tides charts - Wave height, wave period - Water temperature - Sunrise / sunset - Moonrise / moonset - Historical wind statistics - Windy days per month - Wind direction distribution Go Beyond the Basics: Upgrade to Plus, Pro, or Gold membership to gain access to more weather stations, ad-free browsing, and more. - Access exclusive Pro and hurricane-proof stations at premier coastal locations and unlock SailFlow’s hyper-accurate Pro forecasts, updated daily by expert meteorologists for sailing hotspots coast to coast. - Detailed weather at points of interest to coastal residents and property owners near the ocean, rivers, and other bodies of water. On the water features: - Sea surface temperatures - Sea surface currents - Detailed historical wind statistics - Historical wind speed average by year Does your spot need a station? Join the Tempest Weather Network! Get a Tempest Weather System for your club, dock, or backyard. Get support: help.weatherflow.com/hc/en-us/categories/200419268-iKitesurf-iWindsurf-SailFlow-FishWeather-WindAlert Connect with Tempest: - facebook.com/tempestwx - twitter.com/tempest_wx - youtube.com/@tempestwx - instagram.com/tempest.earth Contact Tempest: help.weatherflow.com/hc/en-us/requests/new Website: tempest.earth By purchasing a subscription or downloading SailFlow you agree that you have read and accept our Privacy Policy and Terms of Use. got.wf/privacy got.wf/terms

About

ARMAS

Real-time radiation monitoring for aviation and space weather awareness. Pairs with hardware detectors or provides data from global systems for pilots and travelers.

Highlights
  • Real-time radiation monitoring
  • Space weather awareness
  • Pairs with ARMAS Flight Modules
  • Detects various radiation types
  • Global airspace coverage
  • Data from ground and space systems
Features
Read full description

The Automated Radiation Measurements for Aerospace Safety (ARMAS) program has been developed with NASA funding. It provides accurate, real-time radiation monitoring along with radiation and space weather awareness for the global airspace up to 100 km altitude. The ARMAS app is part of this program and does two tasks: - it pairs with and controls the 7th generation ARMAS Flight Module (FM7) and the 12th generation ARMAS Flight Module (FM12) radiation detector (purchased separately) to provide the highest quality, real-time dose and dose rates in aircraft and suborbital vehicles. It is sensitive to radiation from all sources including heavy ions, alphas, protons, neutrons, electrons, and gamma-rays. - it provides radiation awareness by hosting real-time space weather data coming from dozens of ground- and space-based systems that report all the information relevant to radiation processes without requiring a purchase of the FM7 or FM12. ARMAS is the 'gold-standard' in real-time radiation monitoring and awareness used by professional pilots, business travelers, and commercial space tourists. The ARMAS program is developed and operated by Space Environment Technologies, which specializes in space weather as an official NOAA "Weather Ready Nation" Ambassador.

Screenshots

SailFlow4 screens
ARMAS4 screens

Verdict

The call

The clearest difference is rating: SailFlow at 4.7 against ARMAS's 4.3. SailFlow also leads on ratings volume (5.7K vs 6) and update cadence (every 3 weeks vs every 2 months). ARMAS's advantage is review sentiment (100% vs 84%). On price, ads, in-app purchases and monetization model 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. SailFlow sells 10 in-app purchases, starting at $3.99 per month and ARMAS sells 3 in-app purchases, starting at $2.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

SailFlow holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: SailFlow has 5.7K ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 84% of SailFlow's written reviews are positive against 100% of ARMAS's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

SailFlow ships an update every 3 weeks, ARMAS every 2 months. The most recent releases landed on September 26, 2026 and September 28, 2026 respectively.

Scorecard5 real differences · 6 level
SailFlow versus ARMAS: the parameters behind the verdict, then further details
ParameterSailFlowARMAS
PriceFreeFree
Rating4.7 (5.7K ratings) — better4.3 (6 ratings)
Positive reviews84.4% of reviews100.0% of reviews — better
Number of ratings5.7K — better6
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#35 — better—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.014.0 — better
Further details — not scored
Size138 MB38 MB
Age rating4+4+
DeveloperWeatherFlowSpace Environment Technologies, LLC.

Customer experience

SailFlow

All ratings5,688 ratings
Positive96.5%
Neutral1.8%
Negative1.7%
Written reviews358 reviews
Positive84.4%
Neutral4.2%
Negative11.5%

ARMAS

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

SailFlow

Reported bugs

3 issues
  • Recent update caused app to crash
  • Favorites list not working properly
  • Wind direction arrow pointing incorrectly

Requested features

5 requests
  • Add more local weather stations
  • Improve map and location search
  • Provide more forecast models
  • Add support for Apple Watch
  • Fix wind direction arrow issue

ARMAS

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

SailFlow

Subscriptions10
  • Plus$3.991 Month
  • Plus7 Days trial$5.491 Month
  • Gold$14.991 Month
Show 7 more
  • Pro7 Days trial$14.991 Month
  • Pro - Pay As You Go (auto-renewing)$19.991 Month
  • Gold7 Days trial$21.991 Month
  • Plus$44.991 Year
  • Plus7 Days trial$44.991 Year
  • Pro7 Days trial$119.991 Year
  • Gold$179.991 Year
3 purchases

ARMAS

Subscriptions2
  • Premier$2.991 Year
  • Professional$2.991 Year
One-time1
  • Member$2.99

Questions

Is SailFlow free?
SailFlow is free to download, with in-app purchases available.
Is ARMAS free?
ARMAS is free to download, with in-app purchases available.
Which has better reviews, SailFlow or ARMAS?
SailFlow is rated higher. SailFlow averages 4.7 out of 5 from 5.7K ratings, while ARMAS averages 4.3 from 6 ratings.
Do SailFlow or ARMAS have ads?
Neither SailFlow nor ARMAS shows ads.
Which is updated more often, SailFlow or ARMAS?
SailFlow ships an update every 3 weeks, and ARMAS every 2 months. Most recently, SailFlow was updated on September 26, 2026 and ARMAS on September 28, 2026.

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