Terms of
service.
The terms that keep our products useful, safe and fair for everyone who uses them.
Effective date: 4 August 2026 · Version 1.0
1. About these terms
These Terms of Service (“Terms”) are an agreement between you and tongkenxin.com, a technology research and development team based at the University of Stirling Innovation Park, Stirling, Scotland, United Kingdom (“tongkenxin”, “we”, “us” or “our”). They apply to this website, our software and applications, related support and content (collectively, the “Services”). Privacy is described in our Privacy Policy.
Business support is available at support@tongkenxin.com. General contact and legal notices may be sent to contact@tongkenxin.com. “You” means the person using the Services or the organisation on whose behalf that person is using them.
Eligibility and authority
You may use the Services only if you can form a binding contract under the law where you live. Our Services are not directed to children under 13. If you are under 18, you need a parent or legal guardian’s permission where required. A higher local digital-consent age applies where the law sets one. You represent that information you provide is accurate and that you have authority to accept these Terms for a business.
2. Applications, App Store and Google Play
We may distribute apps through Apple’s App Store, Google Play or other official stores. Store terms, account terms, payment terms and device rules also apply. Apple and Google are not parties to these Terms and are not responsible for maintaining or supporting our apps, except as required by their store terms or applicable law. Apple is a third-party beneficiary of these Terms for iOS apps and may enforce them against you as applicable.
We grant you a limited, personal, non-exclusive, non-transferable, non-sublicensable, revocable licence to download and use each app on devices you own or control, for personal and lawful purposes. You may not copy, sell, rent, lease, redistribute, reverse engineer, decompile, disassemble, modify, create derivative works from, scrape, extract source code from or bypass technical protection in an app except where applicable law expressly allows it.
Updates and compatibility
We may release updates, security patches, new features or discontinuations. An app may require an up-to-date operating system or store account. We do not promise that every feature will be available on every device or in every country. You are responsible for compatible hardware, network access and backup of content that is important to you.
Purchases and subscriptions
Prices, taxes, renewal terms and billing are shown by the store before purchase. Apple or Google processes payment and manages store refunds, cancellation and restoration. Unless mandatory law says otherwise, subscription cancellation takes effect at the end of the current billing period; deleting an app does not necessarily cancel a subscription. We may offer a free trial, but the store’s displayed terms control the trial and conversion.
3. Acceptable and prohibited use
You agree to use the Services responsibly and comply with applicable law. You must not:
- use the Services to break the law, infringe rights, harass, defraud, stalk or harm another person;
- upload malware, exploit code, unlawful material or content that violates another person’s privacy or intellectual-property rights;
- interfere with, overload, probe, scan or defeat the security or operation of a Service;
- use bots, scraping, automated extraction or reverse engineering to discover non-public systems;
- use an app as a substitute for professional medical, fitness, financial, legal, valuation, property, tax or security advice;
- store content in an app when doing so would breach a confidentiality, export-control, data-protection or other obligation;
- attempt to identify, profile or track another person using our tools; or
- use advertising, rewards or referrals fraudulently, including repeated automated views, clicks or device manipulation.
You are responsible for the content you enter and for keeping your device, passcode and store account secure. We may suspend access that presents a security, legal or safety risk, while respecting applicable notice and appeal requirements.
4. Advertising, rewards and third-party services
Some apps may display advertising, including app-open ads, rewarded video ads, interstitial ads and banner ads. Potential advertising or mediation providers include Google AdMob / Google Mobile Ads SDK, Google Ad Manager, Meta Audience Network, AppLovin MAX, Unity Ads, Unity LevelPlay (formerly ironSource), Liftoff Monetize / Vungle, Mintegral, Pangle, Chartboost, Digital Turbine, InMobi, Moloco, Start.io, Verve Group, Amazon Publisher Services, Microsoft Advertising / Xandr and other partners identified in the relevant app. Not every app uses every provider.
Advertising is provided by third parties and may be based on contextual information or, where lawful and consented to, device and advertising identifiers. Rewarded ads are optional; any reward, eligibility and delivery conditions are displayed in the app. We do not guarantee the accuracy, availability, safety or suitability of third-party ads, products, websites or offers. Do not click an ad solely because we display it, and direct complaints about an advertiser’s product to that advertiser.
Third-party SDKs, stores, operating systems and links are governed by their own terms. We are not responsible for a third party’s independent service, content or privacy practice. Our Privacy Policy explains the data consequences and your consent controls.
5. Your content and our intellectual property
You retain ownership of content you create or store in an app. You give us only the limited licence reasonably necessary to provide a requested feature, answer support, secure the Service or comply with law. We do not claim ownership of your local-only content and do not use it for advertising.
The Services, including software, code, interfaces, designs, names, logos, text, graphics, audio, inventions and documentation, belong to tongkenxin.com or our licensors and are protected by intellectual-property laws. We grant no rights except the licence expressly stated in these Terms. “tongkenxin.com”, our logo and product names may not be used without written permission.
If you send feedback, suggestions or ideas, you permit us to use them without payment or restriction, provided we do not identify you publicly without permission. Do not send confidential information through an unsolicited channel.
6. Availability, changes and termination
We work to make the Services dependable, but a Service may be unavailable for maintenance, updates, network failures, events outside our control or a product retirement. Features and content may change. We will take reasonable steps to give notice of material changes where required.
You may stop using a Service at any time. We may suspend or terminate access if you materially breach these Terms, create a risk, misuse rewards or violate law. On termination, your licence ends and you must stop using and delete the relevant app, except that provisions intended to survive — intellectual property, disclaimers, liability limits, disputes and payment obligations — continue. Local app content may be lost when an app is deleted, so maintain your own lawful backups.
7. Warranties, liability and consumer rights
To the maximum extent permitted by law, the Services are provided “as is” and “as available”. We do not promise uninterrupted operation, error-free results, complete accuracy, compatibility with every device, a particular commercial outcome or that a tool is suitable for a professional decision. We may rely on third-party services and data sources.
Nothing in these Terms excludes or limits liability that cannot legally be excluded, including liability for fraud, fraudulent misrepresentation, death or personal injury caused by negligence, or your statutory consumer rights. If you are a consumer in the UK or EEA, you retain legal guarantees and remedies that apply to digital content and services, including rights concerning conformity and digital-content repair, replacement, price reduction or termination where applicable.
Subject to the preceding paragraph, we are not liable for indirect, incidental, special, consequential or punitive loss, loss of profits, revenue, goodwill, opportunity or data, or loss caused by your failure to back up content. To the maximum lawful extent, our total liability for a claim relating to a Service is limited to the amount you paid us for that Service in the 12 months before the event, or GBP 100 if you paid nothing. These limits apply only to the extent permitted in your jurisdiction.
You agree to indemnify us against third-party claims arising from your unlawful use, your content or your breach of these Terms, except to the extent caused by our own negligence or misconduct. This clause does not apply where prohibited by consumer law.
8. Regional terms and governing law
United Kingdom
These Terms are governed by the law of Scotland, unless the mandatory law of your home jurisdiction gives you a different right. Scottish courts have non-exclusive jurisdiction; consumers may bring proceedings in the courts of the part of the UK where they live.
European Economic Area and Switzerland
Mandatory consumer protection and digital-content laws in your country apply. Nothing prevents you from using an available local dispute-resolution body or bringing a claim in your country of residence. We do not require arbitration that would remove a non-waivable consumer right.
United States and Canada
US and Canadian consumers retain mandatory state, federal and provincial protections. Nothing here waives rights under the CCPA/CPRA, other comprehensive state privacy laws, PIPEDA or substantially similar provincial law. Where a limitation is not enforceable, it is narrowed to the maximum enforceable extent. Any arbitration or class-action waiver that would be unlawful or unenforceable in your jurisdiction does not apply.
Other countries
Users in Brazil, Australia, New Zealand, Japan, South Korea, Singapore, India, South Africa, Thailand, China and elsewhere retain mandatory rights under applicable consumer, privacy and digital-services laws, including LGPD, the Privacy Act, APPI, PIPA, PDPA, the Digital Personal Data Protection Act, POPIA and PIPL where applicable.
9. Changes to these Terms
We may revise these Terms to reflect product changes, security improvements or legal requirements. We will publish the updated version and effective date. Material changes may be shown in an app or website notice. If you continue to use a Service after the effective date, the revised Terms apply to future use. If you do not accept a revision, stop using the Service and contact us about any paid-service rights.
10. Contact
Questions, complaints and legal notices should be sent to:
tongkenxin.com
University of Stirling Innovation Park
Stirling, Scotland, United Kingdom
contact@tongkenxin.com
Business support: support@tongkenxin.com
These Terms and the Privacy Policy are the complete agreement about the Services unless a specific written product agreement says otherwise.