How to Switch MMPs Without Losing a Single Data Point (14-Step Checklist)
Migrating MMPs is terrifying — but it doesn't have to be. Follow our 14-step checklist used by 200+ apps to switch with zero data loss.
Switching MMPs is the task most growth teams dread. The fear of losing months — or years — of attribution data keeps teams stuck with tools they've outgrown. But with the right process, you can migrate with zero data loss. Here's the exact process used by 200+ apps.
Phase 1: Pre-Migration (Days 1-7)
Before You Touch Anything
- ✓Export ALL historical data from your current MMP — every report, every dimension, every date range
- ✓Document your current naming conventions: campaign names, ad set structures, custom parameters
- ✓Audit all integrated partners and confirm the new MMP supports every single one
- ✓Map your current MMP's data schema to the new MMP's schema
- ✓Set up the new MMP account and configure SKAdNetwork before touching your SDK
- ✓Create a rollback plan — if something goes wrong, how do you revert?
- ✓Brief your UA team: what's changing, timeline, and who owns each step
The #1 Pre-Migration Mistake
Most teams jump straight to SDK integration. Don't. The single biggest cause of data loss is naming convention misalignment between the old and new MMP. If your campaign 'US_iOS_Facebook_SummerSale' is named differently in the new system, you lose the ability to compare historical vs. new performance. Spend 2-3 days just on naming alignment.
Phase 2: Parallel Testing (Days 8-21)
This is the critical phase. Run both MMP SDKs simultaneously for 2 weeks minimum. Both SDKs fire on every install and event, giving you side-by-side attribution data to compare.
Parallel Testing Protocol
- ✓Integrate new MMP SDK alongside existing SDK
- ✓Run for minimum 14 days — 30 days ideal for full attribution windows
- ✓Daily: compare attribution numbers between old and new MMP
- ✓Investigate any discrepancy >5% — usually reveals a config issue
- ✓Test every conversion event: install, registration, purchase, subscription
- ✓Verify deep linking: deferred deep links, regular deep links, universal links
- ✓Check fraud detection: are both MMPs flagging the same suspicious traffic?
Phase 3: Gradual Cutover (Days 22-30)
Don't flip a switch. Gradually transition to the new MMP while keeping the old one running on legacy app versions. Users who don't update their app will still send data to the old MMP for months — that's expected.
Cutover Steps
- ✓Release new app version with only the new MMP SDK
- ✓Keep old MMP active for legacy app versions
- ✓Update all ad network postbacks to point to the new MMP
- ✓Update SKAdNetwork settings for new MMP
- ✓Monitor both MMPs for 7 days post-cutover
- ✓Decommission old MMP after 30+ days of clean data on the new one
The Bottom Line
A well-planned MMP migration takes 30 days with zero data loss. The parallel testing phase eliminates risk entirely. For the printable checklist and vendor scorecard template, get the full toolkit.
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