iOS Changes and Facebook Ads: Everything You Need to Know
iOS 14.5's App Tracking Transparency reduced the data Meta receives for targeting and reporting. Meta has since dropped the eight-event limit; today the priorities are the Conversions API, first-party data, broad targeting and better measurement.
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Apple's iOS 14.5 update in 2021 introduced App Tracking Transparency, which requires apps to ask permission before tracking people across other apps and websites. Most iPhone users opted out, which reduced the data available to Meta for targeting, optimisation and reporting. Meta responded with Aggregated Event Measurement and pushed advertisers towards the Conversions API. Several early restrictions have since been eased: in 2023, Meta removed the requirement to configure and rank eight conversion events. Today, the priorities are server-side tracking, strong first-party data, broad automated targeting and measurement that doesn't rely on last-click attribution.
What changed with iOS 14 and 14.5?
Apple released iOS 14 in September 2020, and with iOS 14.5 in 2021 began enforcing its App Tracking Transparency framework. Apps must now show a prompt asking users for permission to track them across other companies' apps and websites. Opt-in rates have been low, so much less user-level data flows back to ad platforms.
How it affected Facebook and Instagram ads
- Less complete conversion tracking: the Meta Pixel receives less data from people who opt out, so reported conversions are often lower than actual results.
- Smaller retargeting audiences: people who opt out are harder to include in website retargeting and dynamic ads.
- Delayed and modelled reporting: some results are reported later and partly estimated.
- Shorter attribution windows: Meta's 28-day attribution windows were removed; the standard options are now up to 7-day click and 1-day view.
- App campaigns: app install measurement on iOS relies on Apple's SKAdNetwork.
How Meta responded
Meta introduced Aggregated Event Measurement to measure conversions from people who opt out while respecting their choice. Initially, advertisers had to verify domains and configure and rank up to eight conversion events. In 2023, Meta removed the need to prioritise eight events and the Aggregated Event Measurement configuration tab; the protocol now runs in the background.
Meta has also invested heavily in modelling and automation, including Advantage+ campaigns, which rely on strong conversion signals and creative rather than detailed targeting.
What to do now
- Set up the Conversions API. Send conversion events from your server alongside the Pixel to recover signal lost in the browser. This is now the single most important tracking step.
- Improve event quality. Pass high-value events, such as purchases and leads, with accurate values and good customer information (with consent) to improve matching.
- Build first-party data. Grow your email and customer lists for custom audiences and lookalikes, which are less affected by tracking opt-outs.
- Embrace broad and automated targeting. With less granular data, broad audiences and Advantage+ often perform well when fed strong creative and clean conversion data.
- Measure beyond the platform. Combine Meta reporting with your own analytics, post-purchase surveys and blended metrics such as total revenue versus total marketing spend.
- Verify your domain. It's no longer required for event configuration, but Meta still recommends it.
Frequently asked questions
What did iOS 14.5 change for advertisers?
It required apps to ask permission before tracking users across other apps and websites. Most users opted out, reducing the data available for ad targeting, optimisation and reporting.
Is there still an eight-event limit on Meta?
No. In 2023, Meta removed the requirement to configure and prioritise eight conversion events for Aggregated Event Measurement.
What is the Meta Conversions API?
A way to send conversion events to Meta from your server rather than only through the browser Pixel, which improves the data Meta receives despite browser and iOS restrictions.
Do Facebook ads still work after iOS 14?
Yes. Results are measured differently, but advertisers with good server-side tracking, first-party data and strong creative continue to perform well.
Need help with Meta tracking?
Our performance marketing team sets up Conversions API tracking and measurement for premium brands so campaigns are optimised on accurate data.
