Move off AppMeasurement without losing your history
Migrating off AppMeasurement.js to Adobe's newer collection library is the move every Adobe Analytics team eventually has to make, and the real fear isn't the migration itself - it's a gap in the data where a quarter of history used to be. Webclat runs both libraries in parallel during the cutover so nothing goes dark while the switch happens. The team keeps its year-over-year comparisons intact through the transition.
The situation
Everyone agrees we need to get off AppMeasurement and onto the newer Adobe collection library, but nobody wants to be the one who breaks a full quarter of reporting to do it.
The pain
A botched migration means a visible gap in trend lines, a scramble to explain it to leadership, and a team that's now afraid to touch anything else in the stack.
What we implement
We run your existing AppMeasurement calls and the newer Adobe Experience Platform Web SDK side by side on the same pages until the two report the same numbers, then retire the old library - what's called parallel tracking.
What you get
- Year-over-year and quarter-over-quarter comparisons that survive the migration without a visible seam.
- A validated cutover date backed by matching numbers, not a guess.
- A data layer that's ready to feed Customer Journey Analytics next, instead of needing another rebuild.
Illustrative, not a measured result: a B2B software company mid-migration might run both libraries for several weeks before the numbers reconcile closely enough to cut over; the actual window depends on template count and data layer complexity.
FAQ
Will we lose historical data when we migrate to the Web SDK?
No - historical data already collected under AppMeasurement stays in your report suite; migration doesn't rewrite the past. The risk is a discontinuity going forward if the new implementation doesn't collect the same things the same way, which is exactly what the parallel-tracking period is designed to catch before you rely on it.
How long does the parallel-tracking period last?
Long enough for the two libraries to agree within an acceptable tolerance across your key metrics - typically a matter of weeks, not months, but it scales with how many templates and third-party tags are involved. We don't set a fixed end date in advance; the numbers decide when it's safe to cut over.