Comparison

WeatherTrack GRIB vs SailFlow

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

Head to head
About

WeatherTrack GRIB

Access detailed worldwide weather data, including wind, waves, and currents, with offline capabilities. Plan routes and visualize forecasts with customizable maps and meteograms. Ideal for professionals and amateurs needing precise meteorological information.

Highlights
  • Worldwide GRIB data viewer
  • Offline map and forecast access
  • Detailed weather layers (wind, waves, currents)
  • Route planning and meteograms
  • GRIB file import/export
  • Animation and sharing options
Features
Currently charting
Read full description

WEATHERTRACK Amazing Weather Details at your Fingertips. Worldwide. "An incredibly comprehensive weather app - it accesses many data models from different agencies and provides worldwide coverage. The GRIB layers include wind, precipitation, wave height/direction/period, ocean and tidal currents, air and sea temps, relative humidity and more. WeatherTrack works offline, and GRIB files can be downloaded through an SSB connection, an Iridium AxcessPoint or as an email attachment and opened in the app." (App of the month! in Cruisingworld) http://goo.gl/PLzpI0 (at a glance) Official partner in the AMERICA's CUP TEAM ARTEMIS (2013) Forecasts for Professionals and Amateurs... "Great Tool - I hardly use my SSB radio for weather information any more. Whenever I can pick up Internet via mobile phone, WeatherTrack is much simpler and provides everything that I want." Everything you could ever want in one app: +++ GRIB VIEWER FEATURES in DETAIL: Select area of interest and get detailed GRIB data. View online/offline, point forecast or meteogram (graph). Weather types (GRIB layers): + Wind (10 m above MSL) + Gusts + CAPE + Precipitation (rain/snow) + Dew point + Cloud Cover + Waves Height/Direction/Period + Ocean current (RTOFS) + Barometric Pressure,Highs (H)/Lows (L) + Air-/Sea Temperature, Temp. at 500 mb + Relative Humidity, Geopot.Height at 500 mb Forecasts: + Worldwide Coverage + Forecasts up to 16 days (depending on data model) + Data models:GFS, COAMPS, NAVGEM; current: RTOFS; waves:WW3, WAM85, FNMOC-WW3/FNMOC-MED/FNMOC-EQAM + Resolution: 0.05°, 0.5°, 1°, 2°, 2.5° (dep.on data model) + Forecast interval: from 15 min up to 24hr (dep.on data model) + Updated every 6 hr (GFS) Map: + Offline, high res vector map. Use it offshore or in the mountains. + Zoom in - to 0.001° (111 m /121 yd) - (for very high res GRIB files) + Customizable + Online map (satellite/hybrid/map view) Specials: + Works easily with low bandwith + User friendly + Meteogram, dynamic, displays any layer + Open GRIB files from Email/Browser, 3rd party + Share (Twitter, Facebook, email) + City/Airport Search + Magnifier + In-app guide (offline) + Animation - watch & share + Import/export GRIB files to and from your PC + GRIB via Iridium access point +++ ROUTE WEATHER helps you plan your trip well (In-App purchase). http://goo.gl/PXFCIj (at a glance) + Create your own route. Import/Export to and from other apps (e.g. Dropbox). + Edit waypoints: name, lat/long, duration to next waypoint, (estimated) speed, fuel + Select wind mode: true, relative, apparent + Route Meteogram + Share complete route files by email and open in apps (e.g. Dropbox). + Online map. Display route in satellite/hybrid/map view. +++ GRIB Robot (subscription**) Makes the retrieval of GRIB files over satellite connections easy. +++Tidetech (subscription**) Worldwide hi res Ocean/tidal current +++ GLOBAl-LOCAL Satellite View + Fascinating view from space. + Worldwide clouds updated every 3 hours + Anywhere detailed Point Forecasts on your finger tip, not only for two million locations + World Clock, analog/digital +++ WEATHER ONLINE Selected online resources + Satellite + Radar + Fax + Aviation weather (partly) + Surface analysis + Snow precipitation and more. **SUBSCRIPTIONS AUTOMATICALLY RENEW unless auto-renew is turned off at least 24-hours before end of current period. Tidetech Price: USD $7.99/mo, $34.99/6 mo, $46.99/12 mo GRIB Robot Price: USD $2.99/7d, $5.99/mo, $15.99/3 mo, $28.99/6mo Your iTunes account will automatically be charged at the same price for renewal within 24-hours prior to end of current period unless you change your subscription preferences in your account settings. More: http://goo.gl/CQHG5H WeatherTrack, the Swiss Army Knife for Weather Enthusiasts! One app - many tools

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

Screenshots

WeatherTrack GRIB4 screens
SailFlow4 screens

Verdict

The call

The clearest difference is price: SailFlow at Free against WeatherTrack GRIB's $9.99. SailFlow also leads on ratings volume (5.9K vs 161). On rating, review sentiment, update cadence and ads 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

SailFlow is free to download; WeatherTrack GRIB costs $9.99 up front. WeatherTrack GRIB sells 10 in-app purchases, starting at $2.99 per 7 days and SailFlow sells 10 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for WeatherTrack GRIB against 4.7 for SailFlow. That said, the two scores are not equally well evidenced: SailFlow has 5.9K ratings behind it against 161, so its average is the more settled of the two. Written reviews are what separate them: 89% of WeatherTrack GRIB's written reviews are positive against 84% of SailFlow's.

UpkeepUpdate frequency

WeatherTrack GRIB ships an update every 6 weeks, SailFlow every 3 weeks. Both last shipped on November 10, 2026.

Scorecard2 real differences · 9 level
WeatherTrack GRIB versus SailFlow: the parameters behind the verdict, then further details
ParameterWeatherTrack GRIBSailFlow
Price$9.99Free — better
Rating4.7 (161 ratings)4.7 (5.9K ratings) — better
Positive reviews89.4% of reviews — better84.1% of reviews
Number of ratings1615.9K — better
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#106#39 — better
DevicesiPhone, iPad, iPod, MaciPhone, iPad, iPod, Apple Watch
Requires iOS14.0 — better15.0
Further details — not scored
Size131 MB137 MB
Age rating4+4+
DeveloperBest Search Infobrokerage, IncWeatherFlow

Customer experience

WeatherTrack GRIB

All ratings154 ratings
Positive95.5%
Neutral1.3%
Negative3.2%
Written reviews357 reviews
Positive89.4%
Neutral3.6%
Negative7.0%

SailFlow

All ratings5,827 ratings
Positive96.6%
Neutral1.8%
Negative1.7%
Written reviews364 reviews
Positive84.1%
Neutral4.1%
Negative11.8%

Bugs and requests

WeatherTrack GRIB

Not enough reviews yet to summarise bugs or 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

In-app purchases

10 purchases

WeatherTrack GRIB

Subscriptions6
  • GRIB Robot$2.997 Days
  • GRIB Robot$5.991 Month
  • Tidetech Currents$7.991 Month
Show 3 more
  • GRIB Robot$15.993 Months
  • Tidetech Currents$34.996 Months
  • Tidetech Currents$46.991 Year
One-time4
  • Offline High Resolution MapFree
  • Advanced Local Forecast$0.99
  • MeteoPlus$2.99
Show 1 more
  • Route Weather$5.99
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

Questions

Is WeatherTrack GRIB free?
WeatherTrack GRIB costs $9.99, and also offers in-app purchases.
Is SailFlow free?
SailFlow is free to download, with in-app purchases available.
Which has better reviews, WeatherTrack GRIB or SailFlow?
SailFlow is rated higher. WeatherTrack GRIB averages 4.7 out of 5 from 161 ratings, while SailFlow averages 4.7 from 5.9K ratings.
Do WeatherTrack GRIB or SailFlow have ads?
Neither WeatherTrack GRIB nor SailFlow shows ads.
Which is updated more often, WeatherTrack GRIB or SailFlow?
WeatherTrack GRIB ships an update every 6 weeks, and SailFlow every 3 weeks. Most recently, WeatherTrack GRIB was updated on November 10, 2026 and SailFlow on November 10, 2026.
Which is more popular, WeatherTrack GRIB or SailFlow?
WeatherTrack GRIB currently peaks at #106 in the App Store charts, and SailFlow at #39. Chart position reflects recent download velocity rather than total install base.

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