Terms of service

Effective date: 1 October 2026

By using HanFlow, you agree to these terms. If you do not agree, do not use the application.

Learning tool

HanFlow provides educational practice and automated feedback. Generated explanations, pronunciation assessments, translations, and handwriting assessments can be imperfect and should not be treated as professional certification.

Your data and accounts

You remain responsible for backups and device security. Android 3.64.0 and later does not connect Google sync or external AI providers, and needs no account or API key. The website and earlier Android versions may offer those optional connections; in those editions you remain responsible for your external accounts and any provider charges.

Advertising

HanFlow is free. Web practice and the starter guide do not show ads. In the Android app, your first 50 questions carry no automatic advertising, and after that your first 20 questions each day carry no automatic advertising. Ordinary advertising may appear once those allowances are used. In Android version 3.61.0 and later, full-screen ordinary ads are offered at most once per 20 eligible answers, between activities. Those Android versions also offer optional rewarded ads in Settings, including before those allowances run out.

HanFlow sells nothing. There are no in-app purchases, subscriptions or paid tiers, and no payment is ever required to use any part of the app.

App-only ad credit

The rewarded-credit system described here is available in Android version 3.61.0 and later. The web app and older Android versions do not offer it.

Completing an optional rewarded ad earns at least 0.01p of app-only credit. HanFlow tops this up to the ad network’s reported value converted to GBP. Reported values may be estimates; they do not guarantee the publisher’s final earnings. Ordinary ads do not earn credit. Each rewarded viewing requires your choice; skipping never blocks core learning.

This version uses fixed credit-conversion rates dated 29 September 2026: 1 USD = 0.7548921180096874 GBP and 1 EUR = 0.85718 GBP. GBP values need no conversion. If the value or currency is unavailable or unsupported, the minimum reward still applies. Fractional pennies accumulate.

Settings shows the credit needed for a renewable 24-hour ad-free pass or permanent ad-free access. Confirming an unlock deducts that amount. A pass expires 24 hours after activation; permanent access has no time limit on that installation. Credit has no cash value outside HanFlow and cannot be transferred, withdrawn or exchanged for money.

Credit and unlocks belong to this Android installation. They are excluded from learning backups, Google sync and Android backup or transfer. Resetting learning progress preserves them, but uninstalling or clearing app storage removes them. Rewarded ad availability depends on the network; HanFlow imposes no daily viewing quota. Development builds use a separate demo wallet.

Acceptable use

Do not use HanFlow to violate law, interfere with services, bypass provider limits, or access another person's data without authorization.

Availability

HanFlow is provided as available, without a guarantee that every device, speech engine, AI model, or third-party service will remain compatible or continuously available.

Changes

These terms may be updated as HanFlow changes. A revised effective date will identify the current version.

Contact

Questions: [email protected].