Privacy Policy

1. What Vesta is

Vesta is a Multi-Criteria Decision Analysis (MCDA) tool. It helps you structure and compare alternatives across multiple criteria using methods such as AHP and PAPRIKA-style pairwise trade-offs. Your projects are stored in your account so you can access them from any device.

2. Data we collect

• Account information — your name, email address, and profile picture, provided by your Google account when you sign in via Google OAuth.
• Project data — the criteria, alternatives, weights, comparisons, and any other content you create inside Vesta.
• Usage analytics — anonymous product usage events (e.g. which features you use, how often you interact with the app) collected via PostHog. These events contain no personally identifiable information: your IP address is discarded before storage, and no names or email addresses are included. Analytics are necessary for us to understand how the product is used and to improve it.

3. How we use your data

• To authenticate you and associate projects with your account.
• To store and retrieve your projects across sessions and devices.
• To understand how the product is used and guide product improvements (analytics only).

We do not sell your data or use it for advertising.

4. AI-assisted features

Vesta offers optional AI-assisted guidance (e.g. pairwise comparison analysis). When you use these features, relevant project data is sent via a secure proxy to a third-party AI inference provider — either Cerebras or Groq — running open-weight models (GPT-OSS, Qwen-3). Both providers commit in their API terms not to use submitted data to train or fine-tune models. Data is not retained beyond the duration of the request.

5. Data storage and third-party processors

Your project and account data is stored in Google Firebase (Firestore and Authentication), operated by Google LLC. Anonymous usage analytics are processed by PostHog, Inc. By using Vesta you also agree to their respective privacy policies:

• Firebase Privacy Policy
• PostHog Privacy Policy

6. Data retention and deletion

Your projects and account data are retained for as long as your account exists. You may delete individual projects at any time from within the app. To permanently delete your account and all associated data — including all projects and their content — go to your profile page and use the Delete account option. This action is immediate and irreversible: your projects, profile, and authentication record are all removed.

7. Your rights

Depending on your jurisdiction you may have rights to access, correct, or delete your personal data. You can exercise your right to deletion directly in the app via the profile page.