These Terms govern your access to and use of the Euler Tech website, our mobile and web apps, and any other services we provide. By downloading, installing, or using any of our products, you agree to these Terms and to our Privacy Policy.
These Terms constitute a binding agreement between you and Euler Tech Co., Limited, a private company limited by shares incorporated in the Hong Kong Special Administrative Region with its registered office at Flat 3305, 33/F, Tower 1, Lippo Centre, 89 Queensway, Admiralty, Hong Kong. If you do not agree to these Terms, do not install or use our products.
Separately, your use of our mobile apps is subject to the End‑User Licence Agreement, which is incorporated into these Terms by reference.
You must be at least 13 years old (or the minimum age required by law in your country) to use our products. If you are below the age of majority where you live, you may only use our products with the involvement of a parent or legal guardian.
Some of our apps do not require an account. Where an account is required, you are responsible for keeping your credentials confidential and for all activity that takes place under your account. Notify us at info@eulercore.com if you believe your account has been accessed without your permission.
Our products include the eulercore.com website, our mobile applications distributed through the Apple App Store and Google Play, and any browser‑based tools we make available. We may add, change, or discontinue features at any time. Where a change materially reduces functionality you have paid for, we will offer a reasonable remedy, such as a pro‑rata refund or a continuation of the prior feature set.
In‑app purchases and subscriptions are sold by Apple (for iOS and iPadOS apps) and Google (for Android apps) on our behalf. Your purchase is subject to the terms of the relevant store, in addition to these Terms. We do not receive your payment card details.
Prices are displayed in your local currency where available and are inclusive of applicable taxes. The exact price charged is shown on the store's confirmation screen before you complete the purchase.
Subscriptions renew automatically at the end of each billing period (monthly or annual, as you selected) at the then‑current price, unless cancelled at least 24 hours before the renewal date. Your Apple ID or Google Play account will be charged at confirmation of purchase and again on each renewal.
You can cancel at any time through your Apple ID or Google Play account settings. Instructions are provided on our support page. Cancellation takes effect at the end of the current billing period; you keep access to the subscribed features until then.
Refunds for in‑app purchases and subscriptions are processed by Apple and Google according to their published policies. Details and step‑by‑step instructions are in our Refund Policy.
Where a free trial is offered, the trial period and the price that will be charged at the end of the trial are clearly displayed before you accept. If you do not cancel before the trial ends, the subscription will begin and the disclosed price will be charged. You can cancel at any time during the trial without charge.
Some of our apps are free to download and are supported by third‑party advertising. By using an ad‑supported version of a product, you agree to see advertising served through our advertising partners. You can remove advertising by purchasing the advertised one‑time removal or by subscribing to an ad‑free tier, where available. Section 5 of our Privacy Policy describes how advertising works and what data is shared.
You agree to use our products in accordance with our Acceptable Use Policy. We may suspend or terminate access if we reasonably believe that your use violates that policy, applicable law, or the rights of any third party.
You retain all rights in any content you create, upload, or store using our products. Where a product offers cloud sync or similar services, you grant us a worldwide, non‑exclusive, royalty‑free licence to host, copy, transmit, and display that content solely as necessary to provide the service to you. We do not use your content for advertising and we do not train machine‑learning models on it.
Our products, including the software, designs, logos, and brand names "Euler Tech" and the names of individual products, are owned by Euler Tech or its licensors and are protected by intellectual property laws. Subject to your compliance with these Terms, we grant you a limited, personal, non‑exclusive, non‑transferable, revocable licence to use our products for your own non‑commercial use. All rights not expressly granted are reserved.
Our products include open‑source components released under licences that accompany those components. Attribution and licence texts are listed in the "About" screen of each app and are also available on request at info@eulercore.com.
We may occasionally offer pre‑release or beta features. These are provided "as is", may contain defects, and may be modified or removed at any time. We may collect additional diagnostic data during beta programmes, which is described when you opt in.
We provide our products with reasonable skill and care. To the maximum extent permitted by law, except as expressly set out in these Terms, our products are provided "as is" and "as available", and we disclaim all other warranties, whether express, implied, statutory, or otherwise, including any warranty of merchantability, fitness for a particular purpose, title, and non‑infringement. Some jurisdictions do not allow the exclusion of certain warranties; in those jurisdictions the warranties are limited to the greatest extent permitted by law.
To the maximum extent permitted by law, neither party will be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, or for loss of profits, revenue, goodwill, or data, even if advised of the possibility of such damages. Our aggregate liability arising out of or relating to these Terms will not exceed the greater of (a) the amount you paid to Apple or Google for the relevant product in the twelve months preceding the event giving rise to the claim, and (b) twenty US dollars. Nothing in these Terms limits liability that cannot be excluded by law, such as liability for death or personal injury caused by negligence or for fraud.
To the extent permitted by law, you agree to defend, indemnify, and hold harmless Euler Tech and its officers, employees, and contractors from any third‑party claims arising out of your breach of these Terms or your misuse of our products.
These Terms remain in effect for as long as you use our products. You may stop using our products at any time. We may terminate or suspend access if you materially breach these Terms. Upon termination, provisions that by their nature should survive will survive, including ownership, limitations of liability, and dispute resolution.
We may modify our products or these Terms from time to time. For material changes to the Terms, we will give reasonable advance notice through the apps, our website, or by email. Continued use of the products after the effective date of a change constitutes acceptance of the change. If you do not agree, you should stop using the products before the change takes effect.
These Terms are governed by the laws of the Hong Kong Special Administrative Region, without regard to its conflict‑of‑laws principles. Any dispute arising out of or in connection with these Terms shall be referred to and finally resolved by arbitration administered by the Hong Kong International Arbitration Centre under the HKIAC Administered Arbitration Rules in force when the notice of arbitration is submitted. The seat of arbitration shall be Hong Kong, and the language of the arbitration shall be English. Nothing in this section prevents either party from seeking injunctive or other equitable relief in a court of competent jurisdiction. Where mandatory consumer protection law in your country of residence gives you additional rights, those rights are not affected by this section.
If you obtained our app through the Apple App Store, you acknowledge that these Terms are between you and Euler Tech only, not Apple, and that Apple is not responsible for the app or its contents. Apple is a third‑party beneficiary of the provisions of these Terms that relate to your licence to use the app, and may enforce them against you.
If you obtained our app through Google Play, the Google Play Terms of Service also apply to your download and installation of the app.
These Terms, together with the documents referenced in them, constitute the entire agreement between you and us regarding our products and supersede any prior agreements on the subject matter. If any provision is held unenforceable, the remaining provisions will remain in full force. Our failure to enforce any right is not a waiver of that right. You may not assign these Terms without our consent; we may assign them to an affiliate or successor in connection with a corporate transaction.
Questions about these Terms should be sent to info@eulercore.com or by post to the registered office set out above.