An MMP switch or implementation typically takes between two and six weeks, depending on the complexity of your app, the number of campaigns running, and how clean your existing tracking setup is. You will need to integrate a new SDK, configure in-app events, reconnect your ad networks, and validate data before going live. The process is manageable, but it requires careful planning to avoid data gaps or campaign disruption. Below, we answer the most common questions marketers and app owners face when going through this process.
What actually happens during an MMP implementation?
An MMP (Mobile Measurement Partner) implementation involves integrating the MMP’s SDK into your app, configuring event tracking, connecting your ad network accounts, and validating that attribution data flows correctly. The MMP becomes the central system that ties together installs, in-app events, and campaign spend across all your channels.
In practice, this means your development team integrates the SDK into the iOS and Android builds of your app. Once the SDK is live, you define which in-app events to track, such as registrations, purchases, or subscription starts. Each ad network, whether that is Meta, Google, TikTok, or Apple Search Ads, then needs to be connected to the MMP so attribution can be assigned correctly.
After integration, you run a validation phase. This is where you test installs, trigger events manually, and confirm that the data appearing in your MMP dashboard matches what you expect. Skipping this phase is one of the most common causes of broken attribution setups.
How long does an MMP switch or implementation take?
A straightforward MMP implementation takes two to four weeks. A switch from one MMP to another, especially when live campaigns are running, typically takes four to six weeks. The timeline depends on your app’s complexity, how many ad networks you use, and whether your development team has the capacity to prioritise the SDK integration.
The longest part of the process is usually not the SDK integration itself, but the validation and parallel running phase. When switching MMPs, it is good practice to run both the old and new MMP simultaneously for a period of one to two weeks. This lets you compare attribution data between the two systems and catch discrepancies before fully committing to the new setup.
If your app has a large number of custom events, deep links, or complex funnel tracking, add extra time for configuration and testing. Rushing this phase leads to gaps in your data that are difficult to recover later.
What data do you lose when switching MMPs?
When you switch MMPs, you lose historical attribution data from the old platform. Your new MMP starts attributing installs and events from the moment it goes live. Any install or event that occurred before the switch will not appear in the new system, which creates a break in your reporting timeline.
This means cohort analyses and lifetime value calculations that depend on historical data will need to account for the cutover date. Some teams export raw data from their old MMP before switching to preserve a record, but this data cannot be retroactively imported into the new platform in a way that makes it fully comparable.
What you do not lose is your campaign performance going forward. Once the new MMP is correctly configured and validated, attribution accuracy from that point on should be equivalent to, or better than, your previous setup. The key is ensuring the new system is fully tested before you turn off the old one.
Which in-app events should be tracked from day one?
From day one, you should track the events that directly reflect user value and campaign performance. At minimum, this includes the install event, registration or sign-up, first meaningful action (such as a first purchase, booking, or content view), and any revenue-generating event like a subscription start or transaction.
Beyond these core events, consider tracking events that map to your funnel stages. For an e-commerce app, this might be add-to-cart and checkout initiation. For a fintech app, it could be account verification or first transfer. These mid-funnel events help you optimise campaigns and identify where users drop off.
It is worth noting that platforms like Meta and Google use in-app event data to train their algorithms. If you are running paid user acquisition, the quality and completeness of your event data directly affects how well your campaigns can optimise. Setting up events correctly from the start gives your campaigns a much stronger foundation than trying to retrofit tracking later.
How does an MMP switch affect live campaigns?
An MMP switch can temporarily disrupt attribution for live campaigns if it is not handled carefully. During the transition period, installs may be attributed to the wrong source or not attributed at all if ad network connections are not reconfigured in time.
The safest approach is to run both MMPs in parallel and only disconnect the old one once you have confirmed the new MMP is attributing correctly across all active channels. Before switching, update your tracking links in each ad network to point to the new MMP. Do not deactivate old tracking links until the new ones are confirmed to be working.
Budget pacing and campaign performance may look inconsistent during the transition, particularly if you use in-app events as optimisation signals. Alert your media buying team so they do not make reactive bid or budget changes based on incomplete data during the switchover window.
What should you check before going live with a new MMP?
Before going live with a new MMP, you should verify that the SDK is correctly integrated on both iOS and Android, that all core in-app events are firing as expected, that ad network integrations are active and returning attribution data, and that deep links are functioning correctly.
Run through this checklist before flipping the switch:
- SDK integration confirmed on both platforms with no crashes or conflicts
- Install event firing correctly for organic and paid installs
- All priority in-app events tested and visible in the MMP dashboard
- Ad network partner integrations connected and returning attributed installs
- Deep link routing tested across all entry points
- Postback configurations set up correctly for each ad network
- Fraud prevention settings reviewed and enabled where relevant
- Reporting dashboards and data exports set up for your team
If you are switching from an existing MMP, also confirm that your old tracking links have been replaced and that you have exported any historical data you need to retain.
Which MMP is the right choice for your app?
The right MMP depends on the size of your app, the ad networks you use, your reporting needs, and your budget. The two most widely used platforms are Adjust and AppsFlyer. When comparing AppsFlyer vs Adjust, AppsFlyer is often preferred by larger teams who need advanced reporting and broad network integrations, while Adjust is frequently chosen for its clean interface, strong privacy framework, and competitive pricing for growing apps.
For most apps scaling in 2026, both platforms offer reliable attribution, fraud protection, and deep link capabilities. The practical differences come down to specific integrations, the depth of reporting your team actually uses, and how well the platform fits your existing tech stack.
If you have an inherited tracking setup or an outdated app tracking setup, the choice of MMP is often less important than the quality of the implementation. A well-configured Adjust implementation will outperform a poorly set up AppsFlyer account every time. Before investing time in comparing app attribution tools, audit what you already have and identify whether the problem is the tool or the configuration.
At Wuzzon, we have hands-on experience implementing and migrating between all major MMPs, including Adjust, AppsFlyer, and Branch. Whether you are starting from scratch, dealing with an inherited tracking setup, or looking to do a proper app tracking audit, our team can help you get it right. Explore our app growth stack services to see how we approach measurement and attribution, or talk to one of our specialists to get a free consultation on your current setup.
Frequently Asked Questions
Can we implement a new MMP without involving our development team?
No — SDK integration always requires developer involvement, as the MMP’s SDK needs to be embedded directly into your iOS and Android app builds and submitted through app store review. However, you can reduce the burden on your dev team by preparing all event specifications, ad network credentials, and postback configurations in advance so that when developer time is available, the integration moves quickly. Some MMPs offer no-code or tag-manager-assisted setups for basic configurations, but these are limited and not recommended as a substitute for a proper SDK integration.
What is a postback and why does it matter for my ad networks?
A postback is an automated signal that your MMP sends to an ad network when a specific event occurs — such as an install, registration, or purchase — so the network knows its ad drove that action. Without correctly configured postbacks, platforms like Meta and Google cannot receive the conversion signals they need to optimise your campaigns, which directly impacts your cost per acquisition and ROAS. Before going live with a new MMP, always verify that postbacks are configured for each active ad network and that the correct events are being passed back with the right parameters.
How do we handle deep links during an MMP migration without breaking the user experience?
Deep links need to be recreated and thoroughly tested in the new MMP before you decommission the old ones, since deep link formats and routing logic differ between platforms. Map out every entry point that uses deep links — including paid ads, email campaigns, push notifications, and organic social — and replace them systematically rather than all at once. Test each link on both iOS and Android across fresh installs and re-engagements, and keep a fallback URL in place during the transition period to prevent users from hitting dead ends.
What is the biggest mistake teams make when switching MMPs?
The most common and costly mistake is turning off the old MMP before the new one has been fully validated. Teams often underestimate the parallel-running phase and rush to complete the migration, which results in attribution gaps and campaign data that cannot be recovered. A close second is failing to brief the media buying team about the transition — when attribution data looks inconsistent during a switchover, uninformed media buyers may make reactive bid or budget changes that damage campaign performance unnecessarily.
Will switching MMPs affect our App Store or Google Play rankings?
A well-managed MMP switch should have no direct impact on your store rankings. However, if the transition causes a disruption to your paid user acquisition campaigns — for example, if attribution breaks and campaign spend becomes inefficient — the resulting drop in install volume could indirectly affect ranking signals. To avoid this, time your migration during a lower-spend period if possible, and ensure your campaigns are running normally and attributing correctly before scaling back up.
How do we know if our current MMP setup is underperforming before we decide to switch?
Signs of an underperforming MMP setup include unexplained discrepancies between ad network reported installs and MMP attributed installs, in-app events that are missing or misfiring, deep links that fail to route correctly, and postbacks that are not delivering conversion signals to your ad networks. Before assuming the tool itself is the problem, run an attribution audit to assess whether the issue is configuration-related — in many cases, a misconfigured setup on the right platform is the actual culprit, and a migration is not necessary. If your setup is clean and the platform still cannot meet your reporting or integration needs, that is the right time to evaluate alternatives.
Is it possible to migrate MMPs mid-campaign without pausing ads?
Yes, it is possible to migrate without pausing campaigns, but it requires careful coordination and a strict parallel-running period. The key is to update tracking links in each ad network to point to the new MMP before disconnecting anything from the old one, and to monitor attributed install volumes in both systems simultaneously to catch any drop-off early. Avoid making any campaign structure changes — such as new ad sets, budget shifts, or creative swaps — during the migration window, as this makes it harder to isolate whether performance changes are caused by the MMP transition or the campaign changes themselves.
Related Articles
- Why do my app marketing numbers not add up?
- 5 reasons there's a gap between app clicks and installs
- Best MMP pricing compared for apps: AppsFlyer vs Adjust
- How do I know which ad channel is actually driving app installs?
- Why does my app ad open the wrong screen in-app?
- What is the role of a mobile measurement partner in app advertising?
- How do you advertise an app using performance-based marketing?
- What are the most common mistakes when advertising apps?
- What is app store creative localization?
- How do you optimize an app title for the app store?
EN 
NL 