プライバシーポリシー

更新日: March 20, 2026

STT.ai ("we," "us," or "our") is committed to protecting your privacy. This Privacy Policy explains what information we collect, how we use it, and what choices you have. By using STT.ai, you agree to the practices described in this policy.

私たちが収集する情報

アカウント情報

When you create an account, we collect your email address and, optionally, your name. If you sign in through a third-party provider (e.g., Google), we receive basic profile information from that provider.

支払い情報

When you purchase credits or subscriptions, payment is processed by our third-party payment providers (Stripe, Square). We do not store your full credit card number. We retain transaction records (amount, date, and payment method type) for accounting purposes.

オーディオファイル

When you upload audio for transcription, your files are sent to our GPU server for processing and deleted immediately after transcription is complete. We do not permanently store your audio files. Audio is transmitted over HTTPS (TLS 1.3) and processed in memory.

When you provide a URL for transcription (e.g., a YouTube or podcast link), the audio may be temporarily downloaded to disk on our server using yt-dlp before processing. These temporary files are deleted immediately after transcription is complete. The URL you provide is not stored after processing.

転写

Generated transcripts are stored in your account so you can access them later. If you enable client-side encryption, the transcript is encrypted in your browser before being saved to our servers — we cannot read the stored version. Note: during processing, the server handles the transcript in plaintext before returning it to your browser for encryption. You may delete your transcripts at any time.

使用データ

We collect basic usage information such as pages visited, features used, transcription requests made, timestamps, browser type, and IP address. This helps us improve the Service and diagnose issues.

ゼロ・ノウハウ暗号化

STT.ai offers an optional client-side encryption mode for stored transcripts. When enabled, your transcript is encrypted in your browser using AES-256-GCM with a key derived from your password before being saved to our servers. We never have access to your encryption keys, and cannot read or recover encrypted transcripts. Note: audio must be sent unencrypted to our GPU for transcription — the encryption protects the stored transcript, not the processing step. For more details, visit our Security page.

私たちが利用する情報

We use collected information to:

• Provide, maintain, and improve the Service.
• Process transactions and manage your account.
• Send transactional emails (receipts, account notifications, security alerts).
• Monitor for abuse and enforce our 利用規約.
• Analyze aggregate usage trends to improve performance and features.

クッキーと分析

Essential Cookies

We use essential cookies that are necessary for the Service to function. These include:

• Session cookies: to keep you logged in and maintain your session.
• CSRF tokens: to protect against cross-site request forgery attacks.
• Language preference: to remember your selected language.

These cookies are strictly necessary and cannot be disabled without breaking the Service.

Analytics Cookies

We use Clicky for website analytics to understand how visitors interact with STT.ai. Clicky may set cookies to track page views and sessions. You can opt out of analytics tracking through your browser settings or by visiting our プライバシーの管理 page.

Advertising Cookies

We do not use advertising cookies or trackers. We never have and we never will.

You can disable non-essential cookies (analytics) through your browser settings or our Privacy Settings page. Essential cookies cannot be disabled as they are required for the Service to function.

データ共有

We do not sell your personal data. We never have and we never will.

We share information only in the following limited circumstances:

• Payment processors: Stripe and Square process your payments. They operate under their own privacy policies.
• Legal requirements: We may disclose information if required by law, subpoena, or court order.
• Safety: We may share information if necessary to protect the rights, property, or safety of STT.ai, our users, or the public.

音声ラボの貢献

STT.ai offers an optional Voice Lab program where you can contribute audio samples to help improve open-source speech recognition models. Participation is entirely voluntary and opt-in. Contributed audio is licensed under CC-BY-SA and may be included in publicly available datasets used to train open-source models. You can withdraw from the Voice Lab at any time through your account settings. Contributions made prior to withdrawal that have already been incorporated into released datasets may not be removable.

データハンドリング

If you use the STT.ai API, the same privacy protections apply. Audio submitted via the API is processed and deleted immediately. API request metadata (timestamps, endpoints, response codes) is logged for rate limiting and debugging purposes and is retained for up to 90 days.

８．データの保存・削除

We retain different types of data for different periods:

• Audio files: Deleted immediately after transcription is complete. This includes both uploaded files and files temporarily downloaded from URLs.
• Transcripts: Stored until you delete them or until your account is deleted.
• Account data: Retained while your account is active. After account deletion, personal information is removed within 30 days, except where retention is required by law.
• Usage and analytics data: Anonymized after 90 days.
• Payment records: Retained as required by applicable tax and financial regulations.

You may delete your account at any time through your account settings or by emailing hello@stt.ai. When you delete your account, we remove your personal information and transcripts within 30 days, except where retention is required by law.

個人情報保護法に基づく権利

If you are located in the European Economic Area (EEA) or United Kingdom, you have the following rights under the General Data Protection Regulation (GDPR):

• Right of access: You may request a copy of the personal data we hold about you.
• Right to rectification: You may request that we correct inaccurate or incomplete data.
• Right to erasure: You may request that we delete your personal data.
• Right to data portability: You may request a machine-readable copy of your data.
• Right to restrict processing: You may request that we limit how we use your data.
• Right to object: You may object to our processing of your personal data.
• Right to lodge a complaint: You have the right to lodge a complaint with a supervisory authority in your country of residence.

Our legal bases for processing personal data under the GDPR include: performance of a contract (providing the Service), legitimate interest (improving the Service and preventing abuse), consent (analytics and marketing), and legal obligation (financial record-keeping).

To exercise any of these rights, please contact us at hello@stt.ai. We will respond within 30 days.

CCPAに基づくあなたの権利

あなたがカリフォルニア州の住民なら、カリフォルニア消費者プライバシー法 (CCPA) は、あなたに次の権利を与えます。

• 知る権利 あなたは、私たちが収集したあなたの個人情報のカテゴリと特定の部分の公開を要求することができる。
• 削除権限: 個人情報の削除を要求することができます。
• 売却を拒否する権利 私たちはあなたの個人情報を売ることはありません。オプションはありません。
• 差別免除権 私たちはあなたがCCPAの権利を行使したことに対して差別をしません。

CCPAの申請をするには、メールで hello@stt.ai.

子どものプライバシー

Our servers are located in the United States. If you access the Service from outside the United States, your data will be transferred to and processed in the United States. Audio files may be processed on our US-based GPU servers. By using the Service, you consent to the transfer of your data to the United States.

欧州経済領域およびイギリスのユーザの場合、GDPRの要求に従ってデータが保護されていることを確認するために標準契約条項およびその他の合法的な転送メカニズムに依存します。

セキュリティ

STT.aiは13歳未満の子供を対象としたものではありません。 私たちは13歳未満の子供から個人情報を意図的に収集しません。 13歳未満の子供がアカウントを作成したことを発見した場合、私たちはそのアカウントと関連データを即座に削除します。 13歳未満の子供がサービスを使用していると思う場合は、以下のメールアドレスに連絡してください。 hello@stt.ai.

このポリシーの変更

あなたのアカウントのエクスポート機能を使って、いつでも全ての転写をエクスポートできます。転写は、TXT、SRT、VTT、DOCX、JSON、PDFなどの多くのフォーマットでエクスポートできます。私たちが保有しているあなたの全ての個人情報の完全なコピーが必要な場合は、以下に連絡してください。 hello@stt.ai 30日以内に 提供します。

プライバシーの管理

私たちは、お客様のデータを保護するために、産業標準の技術的および組織的な措置を実施しています。これには、転送中の暗号化 (TLS)、静止中の暗号化、およびオプションのクライアント側暗号化が含まれます。我々のセキュリティ実践についての詳細については、我々のセキュリティ実践に関する政策を参照してください。 Security ページ

コンタクト

私たちは、このプライバシーポリシーを時々更新する場合があります。 重要な変更がある場合、このページの上部にある「最終更新日」を更新し、ユーザーにメールまたはアプリ内の通知を通じて通知します。 変更が公開された後に、サービスを継続して使用すると、更新されたポリシーの受諾となります。

プライバシーの管理

分析オプションおよびデータエクスポートを含むプライバシー設定を管理できます。 プライバシー設定 ページ

連絡先とデータ保護

こちらのプライバシーポリシー、我々のデータ実践に関する質問、またはデータ保護権を行使したい場合は、我々のデータ保護責任者に以下の宛先で連絡してください。

STT.ai
データ保護責任者
メールアドレス: privacy@stt.ai
一般問い合わせ hello@stt.ai
Web: https://stt.ai