About Vantmetry
Vantmetry is a lightweight frontend error tracker. It captures the JavaScript errors and exceptions that slip past your testing and only surface in a real user's browser, and shows them with full stack traces mapped back to your original code.
Server-side errors already land in your logs. Frontend failures usually do not: they happen on someone else's device and vanish. Vantmetry exists to make them visible, without slowing your pages down and without turning your bill into per-event math.
Who builds it
Erol Živina builds and maintains Vantmetry and answers support directly. He also builds and maintains Media Sync, a WordPress plugin installed on more than 50,000 sites (wordpress.org profile), so shipping and supporting software that this many people depend on is nothing new.
How your data is handled
The tracker you embed is public on npm as vantmetry and on GitHub, so you can see exactly what you are shipping. It masks PII in the browser (emails, card numbers, SSNs, JWTs, auth tokens, and sensitive keys) before anything is sent. The full list is in the tracker documentation.
What Vantmetry does not collect:
- No end-user IP addresses are stored
- No cookies set on your users
- No tracking pixels
How it is stored:
- All connections are encrypted with TLS
- Each project is isolated in its own database files
- Sign-in uses magic links or passkeys, so there are no account passwords to steal or leak
- API secret keys are hashed with SHA-256 and never stored in plaintext
- Session tokens are hashed before storage
Data is stored on servers in Germany (IONOS). There is no time-based retention: it stays as long as the subscription is active, and when a project reaches its storage cap the oldest events rotate out first (see the data retention docs). Project and account deletion are available on request, and trial project data is deleted 60 days after the trial ends. Full detail is in the privacy notice.
Billing
Payments are processed by Freemius as Merchant of Record, so invoices, VAT, and refunds are all handled by Freemius. The Freemius Double Guarantee applies: a risk-free, no-questions-asked refund within 14 days. See the refund policy for the detail.