1. About this policy
This policy describes how Kazuma Sasaki (operator of tradeanderror, hereafter "we") collects, uses, and protects personal data through the web service "tradeanderror." We comply with Japan's Act on the Protection of Personal Information, the Telecommunications Business Act, the Consumer Contract Act, and related laws.
Operator: Kazuma Sasaki
Address: Aoyama Marutake Bldg. 6F, 3-1-36 Minami-Aoyama, Minato-ku, Tokyo 107-0062, Japan
Contact: hello@tradeanderror.com
2. What we collect
(1) Account information
- Email address (required)
- Name / display name (optional)
- Registration timestamp and source
(2) Trade data
- Journal entries, entry logs (text, tags, numbers)
- Screen-recording clips (only when you use the recording feature)
- Trade notes and review notes
(3) Technical data & logs
- IP address
- Browser type and version
- Access timestamps and pages viewed
- Error logs
(4) Payment data
Payments are processed by Stripe, Inc. We do not store card numbers or bank account information.
3. iPhone app data
The iPhone app collects only the following, through the same Supabase authentication that the web uses. The app contains no proprietary tracking or advertising SDKs.
- Authentication info from Sign in with Apple or Google OAuth (email, name, account user ID)
- Your own clips, journal entries, and tags created on the web (read for display; quiz judgements written back)
- Minimal app operational logs (crash diagnostics; no personally identifying information)
The iPhone app does not access IDFA, cross-site tracking, location, contacts, photo library, camera, or microphone. See "App Privacy" on the App Store listing for details.
4. Sensitive personal information
We do not collect or store sensitive personal information as defined by Article 2(3) of Japan's Act on the Protection of Personal Information (medical history, criminal record, disability, biometric facial identifiers, etc.). We do not perform face recognition, biometric authentication, or emotion analysis.
5. How we use your data
- To provide, operate, maintain, and improve the Service
- To grant and manage early-registrant benefits
- To send notification emails (service availability, important events)
- To respond to your inquiries
- To prevent and respond to abuse and security incidents
- To produce anonymized statistics
- To respond to lawful requests from public authorities
6. Sharing with third parties
We do not provide personal data to third parties except with your consent, where required by law, where necessary to protect life or property, or in connection with a corporate reorganization where the business continues to be provided.
7. Service providers
| Provider | Role | Country |
|---|---|---|
| Supabase, Inc. | Database, auth, file storage | USA |
| Vercel, Inc. | Web hosting | USA |
| Resend, Inc. | Transactional email | USA |
| Stripe, Inc. | Payment processing | USA |
| Google LLC | Analytics & OAuth | USA |
| Apple Inc. | Sign in with Apple, App Store | USA |
Data may be transferred to or stored in the United States. Each provider operates under its own privacy policy and applicable data protection commitments (DPAs, SCCs as appropriate).
8. Data retention
- Account data: kept while the account is active and for a reasonable period after deletion to satisfy legal and operational requirements
- Trade clips and journal entries: retained until you delete them; permanently deleted within 30 days of account deletion
- Technical logs: rotated on a rolling basis (typically 90 days)
9. Your rights
You may request access to, correction of, or deletion of your personal data. You may also opt out of non-essential email communications. Requests can be sent to the contact email above; we will respond within a reasonable time and as required by applicable law.
10. Cross-border transfers
Some of our service providers are located outside Japan, primarily in the United States. We rely on the providers' privacy frameworks and standard contractual clauses where applicable to ensure equivalent protection.
11. Cookies
See our cookie policy for details on the cookies we use and how to manage them.
12. Children
The Service is intended for users 18 and older. If we learn that we have collected personal data from a person under 18, we will delete it.
13. Updates
We may update this policy. Material changes will be notified to your registered email in advance. Your continued use of the Service after the effective date of the updated policy constitutes your acceptance.
Questions about this policy? Email hello@tradeanderror.com.