What stays private
Fukameru is operated by Aren Clissold. It has no Fukameru sign-in, advertising, or cross-app tracking. Dictionary searches, card editing and study work on your device. Optional iCloud sync uses your private Apple database.
Cloud AI is optional and available only to adults aged 18 or older. When you use it, the text needed for generation is processed by Fukameru’s API on Cloudflare and by Google. Limited verification and usage records are also processed to protect the service and enforce allowances.
This policy covers the app and its TestFlight builds. AI-related processing applies only when you use a version with those features.
Data on your device and in iCloud
The app stores cards, words, readings, definitions, sentences, translations, tags, attached media, review history, search history and preferences. You choose files and photos through Apple’s system pickers.
If iCloud is available, your cards and review records may sync through your private CloudKit database. The developer cannot browse that database. Bundled dictionaries and Tatoeba examples are not uploaded to it. Apple handles iCloud under its own privacy policy.
Optional AI generation
Before your first AI generation, the app asks permission to send study text to Cloudflare and Google. The app asks again when its processing disclosure changes. The same permission covers definitions, example sentences, translations and speech.
- Definitions use the target word, its reading and the learning language.
- Example sentences also use your selected meaning, if any, and difficulty setting.
- Speech generation sends the word, reading or sentence to speak, together with a selected synthetic voice. Existing recordings and microphone audio are not uploaded.
Only the fields needed for each request are sent. The app does not upload your whole library, review history, images or imported deck files to the AI service.
Manual and bulk generation send requests when you start those actions. Selecting AI as the default sentence source, or enabling automatic filling of missing fields, can send requests in the background after you save a card. Automatic filling is off by default.
Cloudflare operates the API Worker, which calls Google’s Gemini API directly. Google’s Gemini models generate text and synthetic speech. The developer does not operate a database of your prompts or generated results. Results you keep are stored with your cards and may sync to private iCloud storage or be included in files you export.
Generated content can be inaccurate. Do not submit sensitive personal information, confidential material or information you do not have permission to share.
AI-only eligibility
Dictionary, cards, study and other non-AI features are available to people of all ages. Only optional AI generation has an 18+ requirement under the separate AI generation policy.
Choosing “Agree and generate” confirms that you are 18 or older and accept the AI policy. Declining leaves the rest of the app available. Acceptance is saved on your device and renewed when the policy or processing disclosure changes. No age-checking API, birth date or identity document is used.
Service verification and usage records
Fukameru uses Apple App Attest to verify the app installation without creating a personal account. Our Cloudflare API retains a pseudonymous installation key identifier, public key, verification counter, request identifiers, short-lived security challenges and request counts. These records provide authentication, prevent replay and abuse, and enforce the daily AI allowance. They are not used for advertising or cross-app tracking.
Network providers receive the connection information needed to deliver requests, including an IP address. Our application derives a daily salted IP hash for short-lived rate limiting instead of storing the raw address in its rate-limit database. Cloudflare and Google may separately process operational, security and billing information under their policies.
Retention and international processing
Study text and AI results
Fukameru’s application handles prompts and outputs to answer your request and does not persist them in its backend database or application logs. Requests go directly from the Worker to Google’s Gemini API.
Requests use Google’s Gemini API directly. Google’s handling depends on the account’s billing settings and API terms: unpaid services may use inputs and outputs to improve products; paid services do not use them for that purpose but may retain them for abuse monitoring. Cloudflare AI Gateway’s Zero Data Retention routing is not used. Fukameru does not log or persist study text or generated results in its backend. Processing may take place outside Japan.
Fukameru does not use your study content to train AI models. Cloudflare’s AI service terms also state that customer content is not used to train generative AI unless otherwise agreed.
Cloudflare and Google may process information outside Japan, including in the United States and other countries where they or their service providers operate. This service does not promise Japan-only storage or processing.
Fukameru’s security and allowance records
- Installation verification records expire after 90 days without a successful verification.
- Daily request counts expire two days after their last update; duplicate-request identifiers expire after 24 hours.
- Verification challenges and active-request records expire after two minutes. IP-hash rate-limit records expire one minute after their last update.
Expired records stop being used immediately and are removed by periodic cleanup. Infrastructure backups and providers’ own retention policies are separate.
Saved cards and support
Cards and media remain on your devices or private iCloud storage until you delete or manage them. Deleting a card or app does not recall requests already sent to providers, remove exported copies, or immediately erase provider security records. If you contact support, we receive your email address and the information you include and keep that correspondence as needed to handle the request and applicable obligations.
Your choices and requests
You can use the dictionary and study without cloud AI. To stop future generation, turn off automatic filling, choose Tatoeba or Manual as the default sentence source, and stop starting manual or bulk AI actions. Cancelling a request may discard its result after the provider has already processed it.
You can edit or delete cards, export them, and manage private iCloud data through Apple’s controls. Removing the app deletes its local data; iCloud and other devices may retain synced copies. Notification permission and selected-file access are managed through iOS.
For questions or applicable requests to access, correct or delete data handled by Fukameru, email fukameru@arenclissold.com. We may ask for the minimum information needed to identify the relevant records. Do not send passwords, identity documents or an unredacted deck. The developer cannot retrieve your private iCloud cards or guarantee deletion of records a provider must retain.
Provider policies and this website
Read Cloudflare’s privacy policy, Google’s privacy policy, Gemini service terms and Apple’s privacy policy for their practices.
This website is hosted by Cloudflare Pages, which processes connection information to deliver and secure it. We do not add advertising or analytics scripts. External links and email support use the destination’s services and policies. Bundled reference data and its licences are listed on the data-sources page.
Changes and contact
We update this page and its effective date when data practices change. Material AI-processing changes also update the in-app disclosure and require renewed permission before further generation.
Privacy contact: Aren Clissold, fukameru@arenclissold.com. General help is available on the support page.