What leaves your device
When you scan your fingerprints, the image is processed inside your own browser — in a Web Worker, which is an isolated part of your phone's processor. The classifier reads the pattern, labels it (for example, "Ulnar Loop"), and discards the image immediately. Only the label is sent to our servers.
Your phone camera
Captures fingerprint image
On your deviceWeb Worker
Classifies pattern on-device
On your deviceImage discarded
Never leaves your device
On your devicePattern label sent
1 word per finger (e.g., "WHORL")
Sent to serverSteps 1–3 run entirely in your browser. Only the output of step 4 (a short word per finger) ever touches our servers.
You can verify this yourself. Open your browser's developer tools, go to the Network tab, clear it, and complete a scan. You will see one small API call carrying the labels — no image upload.
What we actually store
For the fingerprint feature specifically: ten pattern labels, one per finger. A confidence score. A timestamp. That is the full record.
Sample row in our database
FingerprintProfile table{
"leftThumb": "ULNAR_LOOP",
"leftIndex": "PLAIN_WHORL",
"leftMiddle": "ULNAR_LOOP",
"leftRing": "PLAIN_WHORL",
"leftPinky": "ULNAR_LOOP",
"rightThumb": "PLAIN_WHORL",
"rightIndex": "PLAIN_ARCH",
"rightMiddle": "ULNAR_LOOP",
"rightRing": "DOUBLE_LOOP",
"rightPinky": "ULNAR_LOOP",
"confidence": 0.87,
"scannedAt": "2026-04-13T14:22:05.000Z"
}That is the entire record. Ten words, one confidence score, one timestamp. No image data, no biometric template, nothing reconstructable back into a fingerprint.
You cannot reconstruct a fingerprint from the word "WHORL". These labels are categories that millions of people share — they are not identifying data.
Is the science real?
This is the honest answer most assessment tools avoid.
- Dermatoglyphics (the study of fingerprint patterns) has active research correlating pattern types with neurological and cognitive traits, but the evidence base is still emerging, not conclusive.
- We treat fingerprint pattern as one signal among six perspectives. It is capped at 15% in the scoring engine and scaled by per-user classifier confidence — never the sole driver of a recommendation.
- When perspectives disagree (e.g., your fingerprint suggests one strength but peer feedback suggests another), we surface the disagreement rather than hide it.
- Our classifier uses classical computer vision (orientation fields and Poincaré index for singular point detection). It classifies into 8 NIST subtypes that are standard in forensic fingerprint analysis.
If you prefer, you can use PerspectiveMap without scanning your fingerprints at all. The other five perspectives (psychometric, resume, reflection, context, peer) produce a meaningful result on their own.
For the full walkthrough — weights, known limits of each signal, how peer divergence works, and an honest read on DMIT — read our methodology page.
How we make money
If a product is free and you cannot see how it makes money, you are usually the product. Here is our answer.
- We charge institutions (schools, Me@AI clubs) for deployment and mentor tools.
- We do not sell student data. Ever. To anyone.
- We do not run advertising.
- We do not share data with third parties except infrastructure providers under contract (Hetzner for hosting, Resend for email).
Security & disclosure
If you think you have found a security issue, please report it to security@vsumup.org. We respond to every report. Our disclosure policy is published at /.well-known/security.txt.
Privacy Officer: privacy@vsumup.org. That inbox is monitored by a human, not a ticketing system.
Privacy policy summary
- What we collect: account email, age bracket, fingerprint pattern labels (if you choose to scan), questionnaire responses, resume content you paste, peer feedback, and context/experience you enter.
- Where it lives: our PostgreSQL database, hosted on Hetzner servers in Germany, encrypted at rest and in transit.
- Who sees it: you, your assigned counselor or mentor (if you have one), and our engineering team for support and debugging.
- How long we keep it: until you delete it or your account. There is no automatic retention expiry — your data is yours until you say otherwise.
- What we never do: sell data, share with ad networks, train external AI models on your data, or transfer data outside of the providers listed above.
Full policy is available on request from privacy@vsumup.org.
Delete everything
One click, hard delete. If you are signed in, go to Settings → "Delete my account". All records — fingerprint labels, questionnaire answers, resume text, reflections, peer feedback, commitments, the lot — are removed within 30 days.
If you cannot sign in, email privacy@vsumup.org from the address on your account and we will do it manually within 5 business days.