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 who we are, what we collect, what we don't, what we can and can't see, how long we keep it, 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.
Parallax is operated by Belvantis LLC (a Virginia, USA limited liability company), the data controller for the personal data described here. You can reach us about anything in this policy — privacy questions, access or deletion requests, or security disclosures — at info@belvantis.com, or by mail at the address at the end of this policy. We do not currently have a designated Data Protection Officer; the contact above reaches the person responsible for privacy.
When you sign in with Apple or Google, those providers federate your sign-in through Microsoft Entra External ID, which gives us a stable identifier that is unique to you and to Parallax. We use it to associate your devices with your dyad. We never receive your password.
We store the first name you choose so your partner's app can show who they're paired with, and so we can address you in the app. It is stored on our servers and shared with your paired partner. You can change it any time in Settings.
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 ("what I think") and prediction ("what I predict my partner thinks"), and every weekly pulse response, 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 prompt — the wording you choose — is stored on our servers, keyed to your account, so it stays available to you across devices, sign-outs, and re-pairings. We can read these prompts: they are stored the same way as the questions in our public library, and are not part of the end-to-end-encrypted layer. We hold them only to keep your personal question library available to you; we never use them for advertising or share them for that purpose. Your partner's answers to a custom question are always end-to-end encrypted and remain unreadable to us, exactly like answers to any other question.
With "create a set," you can describe a topic you'd like to explore with your partner, and we generate a set of questions for it. To do this, the topic you type is sent from our servers to our AI provider, Anthropic (the Claude API), which returns the generated questions; we then store your topic and the generated questions on our servers, keyed to your account, so the set stays available to you. The topic you type is the only thing sent to Anthropic — it is processed under Anthropic's commercial API terms, under which your inputs are not used to train models. Your partner's answers are never sent to Anthropic or to any AI service; only the questions you ask leave our servers, and only when you tap to generate a set.
From a round that both of you have already revealed, you can tap "ask omnithink" to get a reflection from Omnithink, another Belvantis product. When you do — and only on that explicit tap — that round (the question and both partners' revealed answers and predictions) leaves Parallax's end-to-end-encrypted world and is sent to Omnithink, where it is processed and stored under Omnithink's own privacy policy until you delete it there. This never happens automatically, and only for rounds already revealed to both of you. If you never tap it, no round content is ever sent to Omnithink.
When a round uses a question from our published library, our servers record which library question was issued to your dyad and when. The question itself is public material from our library — not something you wrote — and what you and your partner answered stays encrypted as described above. We also keep a count of how many questions were issued and how many answer envelopes were submitted, never their contents.
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.
If you allow notifications, your device's push token (from Apple's APNs or Google's FCM) is stored so we can tell you when your partner has answered. Notification text contains only your partner's first name and a brief, generic message — never any answer content. You can turn notifications off in your device settings; the token is removed when you sign out.
In the builds we distribute through the app stores, when the app crashes we capture technical details with Sentry: a stack trace, the app version, and your device model and operating-system version. Crash reports do not include your answers, predictions, or notes — that content is end-to-end encrypted and is not part of a crash report — and we do not attach your name. Local development builds send nothing.
We use a privacy-first analytics service (Aptabase) to measure broad, anonymous navigation events — such as app opens and taps on non-content buttons. These events never run on the answer-entry or reveal screens and never include your answer content, predictions, or partner data. We do not use Google Analytics, the Meta SDK, or any advertising identifier (IDFA / AAID).
If you choose to suggest a question for our public library, the text you submit is added to a proposal in our public, open-source question repository on GitHub, attributed to an opaque account identifier (and a display name only if you supply one). Anything you submit there is public and becomes part of public version history; do not include anything private in a suggestion.
We keep our use of outside services deliberately small, and we never share your data for advertising. The services that may process data on our behalf are:
For users in the EU, UK, and other regions with similar laws, we rely on these lawful bases under the GDPR / UK GDPR:
The content you and your partner create — your answers, predictions, pulse responses, and shared notes — is end-to-end encrypted on your device, so we hold only ciphertext we cannot read. All data is additionally encrypted in transit (HTTPS/TLS) and at rest on our servers. The local database on your phone is itself encrypted. Access to our systems is limited and our administrative actions are logged. No system is perfectly secure, but we design Parallax so that the most sensitive thing — what you actually said — is never readable by us. If we ever become aware of a data breach affecting your personal data, we will notify you and any required authority as the law requires.
We do not use automated decision-making that produces legal or similarly significant effects about you. Your empathy-match scores are computed on your own device, and the AI "create a set" feature only drafts questions for you to choose from — neither makes decisions about you.
Parallax stores data on Microsoft Azure servers in the United States. If you use Parallax from outside the United States, your data is transferred to and processed in the United States and by the other providers listed above. For transfers from the EU/UK, we rely on the data-processing terms and transfer safeguards offered by these providers (such as Standard Contractual Clauses and, where applicable, the EU–US Data Privacy Framework). Your answer content is encrypted in transit and at rest, and the end-to-end encryption layer keeps it unreadable to us regardless of where it is stored.
Your answer history is protected by an encryption key that lives only on you and your partner's phones — not on our servers. Because of that, how recovery works depends on your settings:
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 for adults (18 and over) in a romantic, committed relationship. We do not knowingly collect personal 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.
Depending on where you live, you have the right to:
We aim to respond to any request within 30 days. We do not discriminate against you for exercising these rights. If you are in the EU/UK and believe we have mishandled your data, you also have the right to lodge a complaint with your local data protection authority.
If you are a California resident: in the past 12 months we have collected the categories of personal information described above — identifiers (your account identifier, display name, device push token), commercial information (subscription status), internet/usage activity (anonymous navigation events, crash diagnostics), and the content you create (your custom-question and AI prompts, which we can read, and your answers, which we cannot). The relationship context of this content may be considered "sensitive personal information"; we use it only to provide the service you asked for and do not use it to infer characteristics about you.
We do not sell your personal information, and we do not "share" it for cross-context behavioral advertising — and we have not done so in the past 12 months. You have the right to know, access, correct, and delete your personal information, to limit the use of sensitive personal information, and not to be discriminated against for exercising these rights. To exercise any of them, use the in-app controls above or write to info@belvantis.com; you may use an authorized agent, and we will verify the request through your account.
If we make material changes, we will notify you in-app before the changes take effect, and we update the "last updated" date at the top. Continued use of Parallax after a change takes effect means you accept the updated policy.
Privacy questions, data requests, and security disclosures: info@belvantis.com
Belvantis LLC
11166 Fairfax Blvd, PMB 1155, Ste 500
Fairfax, VA 22030-5017, USA