Terms of Service
Effective September 25, 2026
These terms are an agreement between you and Airmass Wx ("Airmass Wx", "we", "us") covering your use of the Airmass Wx website and app (the "Service"). By using the Service or creating an account you agree to them. If you don't agree, don't use the Service.
1. Aviation safety: not an official briefing
Airmass Wx is a planning aid, not an official weather briefing. Its maps, soundings, thermal, cloud, wind, wave, ridge-lift and flight-distance products are automated computer model output. They are often wrong, they can be out of date, and they have not been reviewed by a meteorologist.
Soaring, hang gliding and paragliding carry a risk of serious injury and death. You, as pilot in command, are solely responsible for deciding whether and how to fly. Before every flight get an official weather briefing (in the US, from 1800wxbrief.com or 1-800-WX-BRIEF), check NOTAMs and TFRs, and use current official charts. Airspace shown in the Service is for reference only and is not a substitute for current aeronautical charts.
Never rely on Airmass Wx as your only source of weather or airspace information.
2. Accounts
- You must be at least 13 years old to create an account, and 18 (or have a parent or guardian's permission) to buy a subscription.
- Give an email address you control and keep your password to yourself. You are responsible for what happens under your account.
- One account is for one person. Don't share it or sell access to it.
- You can delete your account at any time from the account page. Cancel any subscription first.
3. Free and Pro plans
The free plan includes a 12-hour forecast. Pro is a paid subscription that adds the full multi-day forecast, extra models and layers and the other features listed in the app. Features may change as we improve the Service.
4. Subscriptions, free trial and renewal
- Prices. Pro is billed monthly or yearly at the price shown in the app and on the checkout page, plus any applicable tax. Payments are processed by Stripe; we never see or store your full card number.
- Free trial. Each account can get one 7-day free trial. A payment card is required to start it. If you don't cancel before the trial ends, your subscription starts and your card is charged the plan price on the day the trial ends.
- Automatic renewal. Your subscription renews automatically at the end of each billing period (monthly or yearly) and your card is charged the then-current price until you cancel.
- Cancelling. Cancel any time from Account → Manage subscription, or email us. Cancelling stops future renewals; you keep Pro until the end of the period you've paid for (or until the trial ends) and are not charged again.
- Price changes. We'll email you at least 30 days before any price increase applies to your subscription. You can cancel before it takes effect.
- Failed payments. If a renewal payment fails, Stripe will retry it for a few days. If it still fails, your account returns to the free plan.
5. Refunds
- Cancel during the free trial and you are never charged.
- If you were charged for a renewal you didn't intend (for example, you forgot to cancel), email us within 14 days of the charge and we'll refund it, provided the paid period has not been substantially used.
- If the Service is down or broken for an extended period through our fault, contact us and we'll refund or credit you fairly.
- Otherwise, payments are non-refundable and we don't give refunds or credits for partly used periods, except where the law requires it.
6. Acceptable use
Don't:
- scrape, bulk-download, resell or redistribute forecast data or map tiles, or build a competing service from them;
- get around plan limits, share Pro access or use someone else's account;
- attack, overload, probe or reverse-engineer the Service's security, or interfere with other users;
- use the Service for anything illegal.
We may suspend or close accounts that break these rules. If we close a paid account for no fault of yours, we'll refund the unused part of your subscription.
7. Data sources and ownership
Forecasts are computed from public weather model data including NOAA HRRR and GFS, ECMWF IFS (Copyright © 2026 European Centre for Medium-Range Weather Forecasts (ECMWF), source www.ecmwf.int, CC BY 4.0, changed by our computations; ECMWF accepts no liability for the data or their use) and DWD ICON (ICON data: Deutscher Wetterdienst (DWD), via Open-Meteo, CC BY 4.0). Radar, satellite, observations, warnings and airspace come from NOAA/NWS, the Iowa Environmental Mesonet, CIRA SLIDER (Colorado State University), the FAA and other providers named in the app, and base maps from the providers credited on the map. The Airmass Wx software, design and derived products belong to us. Your settings, uploaded waypoints and flight tracks stay yours. Waypoint and track files are read in your browser and aren't uploaded to us.
8. No warranty
The Service and all forecasts are provided "as is" and "as available", without warranties of any kind, express or implied, including accuracy, fitness for a particular purpose and non-infringement. We don't promise the Service will be accurate, current, uninterrupted or error-free.
9. Limitation of liability
To the fullest extent the law allows, Airmass Wx and its operator are not liable for any personal injury, death, property or aircraft damage, or any indirect, incidental, special, consequential or punitive damages arising from your use of, or reliance on, the Service or any forecast, even if told such damage was possible. Our total liability for any claim is limited to the amount you paid us in the 12 months before the claim, or US$50, whichever is greater.
Some places don't allow some of these limits. In those places they apply only as far as the law allows.
10. Indemnity
You agree to cover any claims, losses and costs (including reasonable legal fees) brought against us by others that arise from your flying, your misuse of the Service or your breach of these terms.
11. Changes and ending the Service
We may update these terms. If a change is significant, we'll tell you in the app or by email before it takes effect, and continuing to use the Service after that means you accept it. We may change or discontinue the Service. If we shut down Pro, we'll refund the unused part of any paid period.
12. General
These terms are governed by the laws of the United States and of the U.S. state where Airmass Wx's operator lives, without regard to conflict-of-law rules. If any part of these terms can't be enforced, the rest still applies. Not enforcing a term isn't a waiver of it. These terms and the Privacy Policy are the whole agreement between you and us about the Service.
13. Contact
Questions, refunds, bug reports or feedback: eitanlev.steinberg@gmail.com.