Tracking web-to-app conversions under ios att - what actually works?

Since ATT dropped, our conversion analytics feel broken. We need granular user journey data from web campaigns to app subscriptions but can’t use IDFA. Anyone found a compliant method to track which ad creatives lead to paying users without relying on probabilistic models? Bonus if it works with re-engagement campaigns.

Stopped relying on IDFA completely.
Our web flow captures email early, ties it to campaign UTMs.
When users subscribe via web or app, we match via email hash.
Web2Wave’s dashboard shows true LTV per ad group.

First-party data is key.
We use web conversions to tag users before app install.
Platform’s API sends this data to MMPs as custom events.
Now we get cohort-based attribution despite ATT.

Focus on aggregated analytics instead of user-level tracking.
Compare campaign date/time stamps with app install spikes.
Not perfect, but helps estimate effectiveness.

Server-side tracking bridges the gap.

Tested Facebook’s Conversions API for this.
Warm audiences from web flows convert 3x better than cold app install campaigns.
Not as precise as old tracking, but better than nothing.

Some analytics providers claim they solve this.