Privacy Policy

Last updated: January 2026

At Fourier Study, we take your privacy seriously. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our AI research platform.

Information We Collect

Account Information

When you create an account, we collect your name, email address, and password (securely hashed). We do not store passwords in plain text.

Research Content

We store your research queries, conversations, generated content (briefs, audio summaries, flashcards, deep research reports), and any documents you upload for analysis.

Usage Data

We collect information about how you interact with our platform, including content modes used, session duration, and feature usage patterns.

How We Use Your Information

Provide, maintain, and improve our AI research services
Generate personalised research content based on your queries
Send you password reset emails and important service updates
Store and retrieve your generated content (audio, documents, flashcards)
Enable content sharing features when you choose to share

Data Security

Passwords are hashed using bcrypt with salt
All data transmission is encrypted using HTTPS/TLS
User data is isolated using user-specific storage paths
Session tokens are securely generated and stored

Data Retention & Deletion

We retain your data for as long as your account is active. You can delete individual conversations at any time, or permanently delete your account and all associated data. Upon account deletion, all data is removed within 30 days.

Your Rights (UK GDPR)

Right of Access — Request a copy of all personal data we hold about you
Right to Rectification — Request correction of inaccurate personal data
Right to Erasure — Request deletion of your personal data ("right to be forgotten")
Right to Data Portability — Request your data in a structured, machine-readable format
Right to Object — Object to processing of your personal data in certain circumstances

Third-Party Services

We use Anthropic Claude, OpenAI, and Google Gemini for AI processing; ElevenLabs and Google Cloud TTS for audio generation; Brevo for transactional email; Stripe for payment processing; and Neon Database for secure PostgreSQL hosting.

Contact Us

Questions about this Privacy Policy? Contact us at info@wachump.net or use the data export and deletion features in your account settings.

Fourier Study — Evidence-First AI Research with Hybrid Retrieval (RRF)

Investment-grade AI research with zero fabrication. Every chat turn runs hybrid retrieval — vector (pgvector) and keyword (Postgres full-text) search fused via Reciprocal Rank Fusion — so the model only ever sees the highest-signal evidence, and every factual claim is grounded in verified sources with anchored citations.

What Fourier does

Hybrid retrieval on every turn — vector + keyword search fused via Reciprocal Rank Fusion (RRF, k=60) across your documents, conversations and highlights
Live web research with verified citations across every claim
Deep research reports with cross-verification and source grounding
Document analysis for PDFs, Word documents and spreadsheets
Multi-format outputs: chat, executive summaries, slides, audio briefings, flashcards
Project management with task boards, timelines and risk maps
Google Workspace integration for Calendar, Drive, Docs and Sheets
Study mode with personalised learning, progress tracking and Socratic feedback

For analysts, researchers and decision-makers

Fourier is built for professionals who need accurate, verifiable information. Every output is traceable to its source. Enable JavaScript to access the application, or learn more at fourierstudy.net.