Terms of use
Using the apps
You may install and use our apps for your own personal, non-commercial purposes on devices you own or control, under the terms of the store you got them from (Apple's App Store or Google Play). Don't copy, modify, reverse-engineer or redistribute the apps except where the law allows it.
Purchases, subscriptions and refunds
Paid features are sold as in-app purchases through the App Store or Google Play. Subscriptions renew automatically until you cancel them in your App Store or Google Play account settings; cancelling stops the next renewal but does not refund the current period. Free trials convert to a paid subscription at the end of the trial unless cancelled first. Refunds are handled by Apple and Google under their policies: request one through Apple or Google Play. We cannot issue refunds directly.
Your data
Our apps store your data on your device. You are responsible for backing it up, for example by exporting it from the app's settings before changing phones. See each app's privacy policy for details.
Pool Calculator: dosing is an estimate
Pool Calculator provides estimates based on the readings and pool details you enter and on published chemistry guidance. The results are not a substitute for the instructions on a product's label, for professional advice, or for your own judgement. Always follow the product label, never mix chemicals, add smaller amounts and retest. You are responsible for the chemicals you add to your pool and for the safety of anyone using it.
Fuel Log: figures are informational
Fuel economy, cost and service-reminder figures are calculated from the values you enter. They are for your information only; follow your vehicle manufacturer's service schedule.
No warranty
The apps and this website are provided "as is" and "as available", without warranties of any kind, express or implied, including fitness for a particular purpose. We do not promise that they will be error-free or uninterrupted.
Limitation of liability
To the fullest extent permitted by law, Four Sails is not liable for any indirect, incidental, special or consequential damages, or for any loss of data, arising from your use of the apps or this website. Our total liability for any claim is limited to the amount you paid us for the app in the twelve months before the claim. Some jurisdictions do not allow these limits, so they may not apply to you.
Changes
We may update the apps and these terms. If a change is significant we will note it in the app or on this page, and the effective date above will change. Continuing to use an app after a change means you accept the updated terms.
Governing law
These terms are governed by the laws of the State of California, USA, without regard to its conflict-of-law rules. Where these terms conflict with the mandatory consumer-protection laws of the country you live in, those laws apply.