Terms of Service

1. What the service covers

Best Tracker provides personal bookkeeping, bill splitting, shared ledgers, statement import, AI bookkeeping, AI auto-logging (bulk recognition from screenshots and shortcut-based logging), the AI ledger connector and reporting. The exact scope may change with the product version, device operating system or operational arrangements.

2. AI auto-logging

AI auto-logging relies on screenshots you provide yourself, or screen captures produced through a system shortcut. Those images are used solely to recognise the entries they contain and create bookkeeping records; the results are stored as text in your ledger. Recognition may be imperfect — you can review and edit entries both before and after they are filed, and you are responsible for confirming that your final records are accurate.

3. The AI ledger connector

The AI ledger connector is built on the MCP protocol and lets you authorise a third-party AI agent to access and act on your ledger data. Authorisation is initiated entirely by you, its scope is yours to choose, and it can be revoked at any time inside the app. You are responsible for assessing the reliability of any agent you connect. We do not accept liability for losses arising directly from data processing, mistaken actions or data leakage caused by a third-party agent you have authorised, but we will provide the assistance you need to revoke access and inspect activity records.

4. Your account and its security

You should keep your account, verification codes and the devices you sign in on secure. Losses caused by disclosing or lending your account, or by failing to keep your device secure, are your own responsibility. If you notice anything unusual about your account, please contact us promptly.

5. Acceptable use

You may not use this service for anything unlawful, to infringe the rights of others, to interfere with the normal operation of the product or to circumvent its security measures. You may not upload malicious code, unlawful content or material that infringes third-party rights.

6. Your data and content

The ledgers, entries, notes and images you enter or upload belong to you or to the relevant rights holder. We process that data only to the extent necessary to provide services such as syncing, recognition, reporting and backup.

7. Membership and paid services

7.1 Membership types

Some advanced features of Best Tracker require a membership. We may offer recurring memberships such as monthly and annual plans, as well as a lifetime membership bought with a single one-off payment. The price, service period, range of included features and usage allowances of each membership type are governed by what is published on the purchase page at the time you buy.

7.2 The scope of your benefits is what was published at the time of purchase

The membership benefits you receive are limited to the features and allowances set out on the purchase page at the time of your purchase. Features that we later add, develop independently or introduce by bringing in third-party technology (including but not limited to new AI capabilities, new model versions and new connector types) are not automatically included in the membership you have purchased; we are entitled to price such new features separately or to place them in a separate paid tier. When we launch a new feature, we will state whether it is included in existing membership benefits.

7.3 Confirming your purchase and activation

A membership is a digital service, and the corresponding benefits are activated immediately once payment succeeds, so please make sure the membership type, service period and account you have selected are correct before you buy.

Depending on the payment channel and network conditions, there may be a short delay before a payment is credited. If your payment succeeds but the benefits are not activated, please first try restarting the app to refresh, or send us your user ID and proof of payment so that we can deal with it — please do not pay a second time. Where duplicate payments have created extra orders, we will verify them and refund the duplicated amount as set out in Section 7.5.

7.4 Auto-renewal

For recurring memberships you can choose to enable auto-renewal. Auto-renewal is not a compulsory part of buying a membership; you may instead choose a single-period purchase without auto-renewal.

Before you enable auto-renewal, we will show you separately and prominently on the purchase page: the renewal cycle, the amount charged each period, the time of the first charge and the rules governing the timing of subsequent charges, and exactly how to cancel auto-renewal. Auto-renewal can be enabled only after you have confirmed that information.

If you enable auto-renewal through WeChat Pay, you must separately confirm the direct-debit authorisation on the WeChat Pay contract page; auto-renewal starts only once that authorisation succeeds. WeChat Pay will send you a payment notification after each charge is completed. You can review that authorisation and cancel it at any time via WeChat → Me → Services → Wallet → Payment Settings → Automatic Payments; once it is cancelled, no further charges will be made.

If you enable auto-renewal through the Apple App Store or Google Play, charges are made by the relevant app store under its own rules, and receipts, subscription status and the cancellation option are all provided by that app store. You can check your next billing date and cancel your subscription at any time: on iOS, go to Settings → Apple Account → Subscriptions; on Android, go to Google Play → Menu → Subscriptions. Under app store rules, cancellation must be completed at least 24 hours before the next billing date, otherwise you will still be charged for that period.

The membership page in the app provides a way to check your subscription status, together with links through to the subscription management pages of each of the channels above. Cancelling auto-renewal does not affect the benefits of the period you have already paid for; you can continue to use them until that period ends. Where a charge has been made and the service period has already begun, the fee for that period is handled as set out in Section 7.5.

7.5 Payment channels and refunds

You can buy a membership through an Apple App Store in-app purchase, a Google Play in-app purchase or WeChat Pay. Refunds are handled differently depending on the channel:

If you purchase through the Apple App Store or Google Play, orders, charges and refunds are handled independently by the relevant app store under its own refund policy. We have no authority to issue refunds for those orders directly, so you need to apply to the app store concerned. When you make such a request, we will provide the assistance you need, such as verifying orders and usage records.

If you purchase through WeChat Pay, the following rules apply. Membership services are digital goods and services within the meaning of Article 25 of the Law of the People's Republic of China on the Protection of Consumer Rights and Interests, and they are delivered immediately upon activation, so the right to return goods without giving a reason does not apply to any portion that has been activated and whose service period has begun, and the fees for that portion will not be refunded.

However, in any of the following circumstances you may contact us to request a refund, and once we have verified it we will return the relevant amount by the original payment route within 15 working days:

(i) duplicate charges, incorrect charges or incorrect order amounts caused by a system fault — the amount overcharged will be refunded;

(ii) payment succeeded but the membership benefits were never activated, and we were unable to restore them for you within a reasonable period;

(iii) the service suffers a major fault or a sustained failure of core functionality that we fail to fix within a reasonable period after you report it — a refund is calculated pro rata on the number of unused days;

(iv) we failed to give the prominent notice on the purchase page required by Section 7.4 before you enabled auto-renewal — the fee for that renewal period will be refunded;

(v) the payment falls within the circumstances relating to minors set out in Section 7.6;

(vi) the service is terminated in the circumstances set out in Section 9 of these Terms, in which case that Section applies.

7.6 Payments by minors

This service does not offer paid features to minors under the age of 14. A minor under the age of 18 must obtain their guardian's consent before using any paid feature.

Where a minor has used a guardian's payment account without that guardian's consent to make a payment that is not commensurate with the minor's age and mental capacity, the guardian may contact us to request a refund. So that we can verify the situation, the guardian should provide the following: proof of identity for the guardian and the minor together with proof of their relationship, proof of ownership of the payment account, the order number or proof of payment, and a written account explaining that the payment was made by the minor acting alone. Once we have verified this, we will refund the amount concerned and may at the same time take the protective measures necessary in relation to the account.

7.7 Changing and upgrading your membership type

The different membership types are separate products from one another. If you already hold a monthly or annual membership and then buy a lifetime membership, you must pay the lifetime membership price current at that time in full, and the amount you paid for the recurring membership is not credited against it as a price difference. The remaining service period of your original recurring membership is unaffected and can be used until it expires, after which it will not renew. If you already hold a lifetime membership, please do not also buy a recurring membership.

7.8 Price changes are not retroactive

We may adjust membership prices in line with our operating costs, and any adjustment applies only to new purchases and new renewal periods that occur after it takes effect. If you have already completed a purchase, you will not be asked to pay the difference when prices rise, and no difference will be refunded when prices fall or a promotion is run.

7.9 Account binding and the prohibition on transfers

Membership benefits are bound to the registration method by which that account was originally created when the membership was activated (mobile number, email address or third-party account), are for your own use only, and may not be unbound, changed, transferred, lent, rented out, sold, given away or shared with anyone else. You may not buy, top up, split or resell membership benefits through unofficial channels, nor use technical means to bypass payment verification, forge proof of payment or abuse the refund process.

If you genuinely need to change your sign-in method for objective reasons, such as your mobile number being deactivated, you can contact us and we will help you, provided we are able to verify that you are the account holder. As a rule, we will do this only once for each account.

7.10 Consequences of breach

If you engage in any of the conduct described above, or otherwise act in breach of Section 5 of these Terms, we may, depending on the seriousness of the case, issue a warning, restrict certain features, suspend your membership benefits, or go as far as terminating your membership and closing your account. Where your membership is terminated because of your breach, the fees you have paid will not be refunded. Before imposing any restriction or termination we will make reasonable efforts to notify you, and we will keep an appeals channel open to you.

8. Lifetime membership

8.1 What “lifetime” means

In these Terms, “lifetime membership” means that, throughout the product life cycle during which the relevant Best Tracker service continues to be operated, you may use the benefits you purchased without paying again. It does not refer to the span of your natural life, nor does it constitute a promise by us that the service will exist for ever. Section 9 of these Terms governs the circumstances in which the product life cycle ends and how they are handled.

8.2 Scope of benefits

Section 7.2 of these Terms applies equally to the scope of lifetime membership benefits, which are therefore governed by the features and allowances set out on the purchase page at the time of your purchase. Where we launch new features later, we will try to bring them within lifetime membership benefits, but for features that involve ongoing third-party costs (especially AI-related capabilities) we reserve the right to price them separately.

8.3 Usage allowances for AI features

Features such as AI bookkeeping, AI auto-logging and the AI ledger connector incur a real cost charged by third-party model providers each time they are called. Lifetime members' use of those AI features is therefore subject to a usage allowance calculated on a monthly basis, the exact size of which is governed by what is published on the purchase page. Once your allowance is used up you can still use all non-AI features as normal, and you may choose to buy additional allowance on a pay-as-you-go basis or wait for the allowance to reset in the next calendar month.

Because the pricing and supply of upstream model providers may change, we reserve the right to adjust the monthly AI allowance for lifetime members in the light of market conditions. To protect your reasonable expectations, any such adjustment is subject to the following limits: (i) before the adjustment we will give you no less than 30 days' advance notice by in-app notification, in-app message or other reasonable means; (ii) the adjusted allowance will not fall below the guaranteed minimum allowance published on the purchase page; (iii) if the adjustment has a material adverse effect on your core benefits, you may raise an objection within 30 days after the notice is issued, and we will discuss with you providing additional allowance, extending other benefits, or applying the valuation method set out in Section 8.5.

8.4 Preventing abuse

Lifetime membership benefits are designed for normal personal use by a single individual. If reasonable technical means show that you are calling the service with automated scripts, making bulk requests at abnormal frequencies, sharing one account among several people, or using the account to provide commercial bookkeeping services or to resell the service, or are otherwise going beyond the range of normal personal use, we may limit how often the relevant features can be called and deal with the matter as set out in Section 7.10. Lifetime membership benefits are non-transferable and indivisible. If the account holder dies, their heirs may contact us to request a data export; the membership benefits themselves are not inheritable.

8.5 How the value of benefits is calculated

Where these Terms require the remaining benefits of a lifetime membership to be valued (for example when handling an objection under Section 8.3 or the wind-down arrangements under Section 9.2), then unless the law provides otherwise or the parties agree otherwise, the used and unused portions are calculated on a straight-line amortisation over 5 years from the date of purchase. That amortisation period is used solely for valuing benefits; it is not a commitment by us as to how long the service will be operated, nor does it mean that the service will end after 5 years.

9. Changes to, suspension of and termination of the service

9.1 Routine updates and adjustments

We may update, improve, suspend or adjust the service in order to enhance the experience, fix problems, keep pace with operating system updates or meet legal and regulatory requirements. Where a change materially affects membership benefits, we will give advance notice by reasonable means such as an in-app notification, an in-app message or an official announcement.

9.2 Discontinuing the service on our own initiative

If we decide on our own initiative to discontinue all or the core parts of the Best Tracker service, we will:

(i) announce it no less than 30 days before the date the discontinuation takes effect, by in-app notification, in-app message and official channels;

(ii) immediately stop selling all membership products from the date of the announcement;

(iii) provide a data export window of no less than 90 days from the date of the announcement, during which you can export your ledger, entry and note data in full in a common format such as CSV or Excel, and we will provide the export guidance and assistance you need;

(iv) offer affected members a substitute arrangement of equivalent value, including but not limited to extending or granting equivalent benefits in other products we still operate, issuing exchange vouchers of equivalent value, or helping you migrate to an alternative product and bearing the associated migration costs. The value of the unused benefits to be matched is calculated using the method set out in Section 8.5.

In addition to accepting the substitute arrangement described above, users who bought through the Apple App Store or Google Play may still apply to the app store concerned for a refund themselves, in accordance with that store's policy.

9.3 Force majeure and liquidation

If the service can no longer be provided because of force majeure such as an earthquake, flood, epidemic or war, because of changes in laws, regulations, regulatory policy or administrative orders, or because we enter bankruptcy, dissolution or liquidation proceedings, we will use our best efforts, so far as objectively possible, to give advance notice and to preserve a data export window. In those circumstances we will deal with the resulting claims and debts through the statutory procedures and will bear no compensation liability beyond the fees you have actually paid. This Section does not release us from any liability we must bear under mandatory provisions of law.

9.4 Dependence on third-party services

The AI-related features of this service depend on the interfaces and computing power provided by third-party model providers and cloud providers. If such a third party suffers a service outage, withdraws an interface, raises its prices substantially, changes its terms of use or stops supplying us for its own compliance reasons, we may be forced to adjust, restrict or withdraw the corresponding features. We will make reasonable efforts to find an alternative and to tell you in advance, and such circumstances are not treated as a breach by us. If they have a material adverse effect on core membership benefits, the matter is handled by reference to Section 8.3.

9.5 Withdrawal of an individual feature

If we withdraw a non-core feature that was not your main purpose in buying a membership, this does not amount to termination of the service and we will not provide a refund or compensation for it. If the feature withdrawn forms a core part of your membership benefits, the matter is handled by reference to Section 9.2(iv).

10. Disclaimer and limitation of liability

Best Tracker is a bookkeeping and data-organisation tool. Reports and AI recognition results are for reference only and do not constitute financial, tax, investment or legal advice. You should verify your records against your actual receipts and your own judgement.

We will make reasonable efforts to keep the service stable and your data secure, but we do not warrant that the service will be absolutely uninterrupted or absolutely free of errors. Where the service is temporarily unavailable because of a network fault, a device problem, system maintenance, your own actions or a third-party cause, we will restore it as soon as we can.

To the maximum extent permitted by law, our aggregate liability under these Terms shall not exceed the total fees you actually paid for this service in the twelve months preceding the dispute; for lifetime members, it shall not exceed the total one-off fee you actually paid. We are not liable for indirect losses, loss of expected profits or loss of data value. This Section does not apply where we cause you personal injury or damage to property through wilful misconduct or gross negligence.

11. Changes to these terms

We may revise these terms in response to changes in laws and regulations or to adjustments in our business. Where a revision affects your material rights or obligations, we will give notice no less than 7 days before it takes effect, by in-app notification or official announcement, and will mark the update date on the page. If you do not agree with a revision, you can stop using this service; if you have already bought a membership, you can contact us before the revision takes effect and we will reach a solution with you as set out in Section 8.5. If you continue to use this service after a revision takes effect, you are deemed to accept the revised terms.

12. Governing law and dispute resolution

The conclusion, validity and interpretation of these terms, and the resolution of disputes under them, are governed by the laws of the mainland of the People's Republic of China. Any dispute arising from these terms should first be resolved by friendly negotiation between the parties; if negotiation fails, either party may bring proceedings before a People's Court with jurisdiction.

13. Contacting us

If you have questions about these terms or about using the service, you can reach us through the feedback option in the app or via the contact details we publish officially.