Parallax is a relationship insight app for couples. Both partners answer the same question; the app holds both answers privately until you've both submitted, then reveals them side by side. Over time it measures how well you understand each other.
This policy explains what we collect, what we don't, what we can and can't see, and what choices you have. We have written it plainly. If anything here is unclear, write to us at info@belvantis.com and we will revise the language.
When you sign in, we receive a stable identifier from your identity provider (Apple, Google, or email-and-password via Microsoft Entra). This identifier is unique to you and to Parallax. We use it to associate your device with your dyad. We do not receive your password.
When you pair with your partner, we store the dyad relationship — that your account is linked to theirs — along with each device's public key. The public keys are mathematical artifacts; they cannot be used to read your answers.
Every answer and prediction you write is encrypted on your phone before it leaves the device. The encryption key lives only on your and your partner's phones. The data we store on our servers is opaque ciphertext. We cannot decrypt it. Nobody can but you and your partner.
Parallax has two kinds of reflection notes. Private notes never leave your device — they are stored locally on your phone alone and we never receive them. Shared notes are written by one partner for the other; we encrypt them on your phone with the same end-to-end key your answers use, and store the opaque ciphertext on our servers so your partner can fetch and decrypt it. We cannot read shared notes.
If you write your own question for your partner, the question text is end-to-end encrypted on your device before it is stored. We hold opaque ciphertext for the question metadata and never see the question text.
If you subscribe, we store the subscription state (active, in trial, cancelled, etc.) so we know whether your account has access. Payment is handled entirely by Apple (App Store) or Google (Play Store). We never see your card, your billing address, or your payment history.
We measure broad navigation events — app open, button taps on non-answer screens, screen views excluding answer entry and reveal screens — using Aptabase, a privacy-first analytics service. These events do not include any of your answer content, predictions, or partner data. We do not use Google Analytics, Meta SDK, or any advertising identifier (IDFA / AAID).
When the app crashes, we capture a stack trace using Sentry. Crash reports from the answer-entry, pending, and reveal screens are dropped entirely; reports from other screens have any free-text fields scrubbed before they leave the device.
If you lose your phone and your partner has their phone, you can re-pair on a new device. You and your partner will generate fresh keys; your past answer history is not recoverable by us or by anyone else — the keys that could decrypt it are gone. We told you this in onboarding. It is the cost of nobody else being able to read your answers.
If you both lose your phones at the same time, your history goes with them.
If you choose to share insights with a therapist or counselor, you can grant them read-only access to per-domain match rates and large-gap flags — not your raw answers. You can revoke their access at any time. Counselor mode is not enabled by default and requires both partners to opt in.
Parallax is intended for adults in a romantic, committed dyad. We do not knowingly collect data from anyone under 18. If you believe a minor is using Parallax, write to us at info@belvantis.com and we will delete the account.
Parallax stores data on Microsoft Azure servers in the eastern United States. If you are using Parallax from outside the United States, your data is transferred to and processed in the United States. The data is encrypted both in transit and at rest, with the end-to-end encryption layer described above ensuring that your answer content is unreadable to us regardless of where it is stored.
You have the right to:
For users in the EU/UK: your supervisory authority is whichever data protection authority is established in your country.
If we make material changes, we will notify you in-app before the changes take effect. The current effective date is at the top.
Privacy questions: info@belvantis.com
Security disclosures: info@belvantis.com
General contact: info@belvantis.com
Belvantis · USA