Feature 04 — Cross-Device Stitching

They clicked on mobile.
Converted on desktop.

Most attribution systems treat a click on someone's iPhone and a form submission from their MacBook as two unrelated events. The conversion goes unattributed. Your cost-per-lead inflates. Your best campaigns look worse than they are.

See It in Action → View Live Dashboard
~40%
Of B2C conversions involve more than one device in the journey
Email
Hash is the strongest cross-device signal — same person, any device, always
No PII
The email is hashed one-way before it enters the system — it cannot be reversed

Why cross-device breaks attribution

Cookies are device-specific. Session storage is browser-specific. An IP address changes between mobile data and home WiFi. Every standard attribution method relies on one of these — and none of them survive a device switch. Google can stitch journeys for logged-in Google users, but that's a fraction of your audience and it's Google's data, not yours.

How email hash solves it

When a user submits your form, HashVex hashes their email address using a one-way function before it enters the attribution system. That hash is the same on every device, in every browser, at any point in time. A mobile click followed by a desktop form submission from the same email address gets stitched into one verified conversion — no cookies, no login required.

Token source priority

HashVex uses a cascade of identifiers — the strongest available signal takes priority. This means you always get the most reliable cross-device identifier, with automatic fallbacks if the primary isn't available.

1
Email hash
Strongest signal. Same person on any device, any browser, any time. Collected on form submit.
BEST
2
Phone hash
Second strongest. Collected on form submit if email isn't available. Same cross-device reliability.
STRONG
3
gclid / fbclid
Click-level ID from the ad platform. Single-session only, but cryptographically unique per click.
GOOD
4
IP + fingerprint
Probabilistic fallback using screen resolution, timezone, language. Works when nothing else is available.
FALLBACK

What this means for B2B campaigns

In B2B, the research cycle is longer. A decision-maker might see your LinkedIn ad on their phone during a commute, do more research on their work laptop, and fill out a contact form that evening on their home computer. Three sessions. Three devices. One lead. Standard attribution counts zero — or if something fires, it's accidental. HashVex counts one, correctly attributed to the campaign that started the journey.

Same person.
Any device.

HashVex stitches the journey without storing the identity. The email is hashed before it enters the system. The attribution is accurate. The privacy is maintained. That's not a compromise — that's just better engineering.

Try the Demo → View Dashboard