Comparison

SailFlow vs SailDay

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

SailDay

Features
Read full description

Tired of going out on your boat only to find yourself stuck in the middle of the sea due to a sudden dead calm, or worse, having to fight against dangerous gusts? SailDay is your ultimate digital tactician. The only weather app designed exclusively for those who go to sea. Instead of making you decipher dozens of complex weather charts, SailDay analyzes the data for you and gives you a clear score from 0 to 100 on the "Sailing Quality". Choose your Boat in your profile, and the algorithm will adapt to your needs: • Dinghy or Small Boat? The app will look for days with light wind and calm seas for safe and fun outings. • Cruiser or Racing? The app will focus entirely on steady, strong wind to get you planing with full sails. MAIN FEATURES: • Ruthless Algorithm: We analyze Knots, Gusts, Rain, and Thunderstorm Risk to tell you exactly when to cast off. • Smart Push Notifications: Add your favorite ports or bays, and we'll notify you when a "Perfect Wind" is on the way. • Gear Advice: Based on wind strength and temperature, we suggest the right outfit (e.g., ocean foul weather gear or light jacket) and sail trim (e.g., full sails or reefed). • Legendary Database: Over 100 of the world's most famous ports, marinas, and straits pre-loaded, from Porto Cervo to the Strait of Bonifacio, from Cowes to Antigua. And if your secret bay isn't there, you can search and add it! • Webcams & Maps: Access live webcams of the port with a single tap to check conditions in real-time. SAILDAY PREMIUM: Upgrade to Premium to unlock the app's full potential: • Extended 10-day forecasts (to plan your cruises or weekends in advance). • Unlimited ports saved on your Home screen. • Unlimited push notifications across all your routes. Stop wasting your weekends in port. Download SailDay, hoist the sails, and get ready for the perfect navigation. --- Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

SailFlow4 screens
SailDay4 screens

Verdict

The call

The clearest difference is ads: SailFlow at none against SailDay's shown. SailFlow also leads on chart position (#42 vs unranked). SailDay's advantage is update cadence (every 3 days vs every 3 weeks) and iOS requirement (13.0 vs 15.0). On price, 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. SailFlow sells 10 in-app purchases, starting at $3.99 per month and SailDay sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

SailFlow ships an update every 3 weeks, SailDay every 3 days. The most recent releases landed on October 22, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 7 level
SailFlow versus SailDay: the parameters behind the verdict, then further details
ParameterSailFlowSailDay
PriceFreeFree
Rating4.7 (5.8K ratings) — better—
Positive reviews84.2% of reviews—
Number of ratings5.8K — better—
Update frequencyEvery 3 weeksEvery 3 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
Best chart rank#42 — better—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size137 MB67 MB
Age rating4+4+
DeveloperWeatherFlowMariano Ceccarelli

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

SailDay

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
2 purchases

SailDay

Subscriptions2
  • SailDay Premium Monthly3 Days trial$1.991 Month
  • SailDay Premium Yearly7 Days trial$8.991 Year

Questions

Is SailFlow free?
SailFlow is free to download, with in-app purchases available.
Is SailDay free?
SailDay is free to download, with in-app purchases available.
Do SailFlow or SailDay have ads?
SailDay shows ads; SailFlow does not.
Which is updated more often, SailFlow or SailDay?
SailFlow ships an update every 3 weeks, and SailDay every 3 days. Most recently, SailFlow was updated on October 22, 2026 and SailDay on October 5, 2026.

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