Which event should Meta optimise on?

TL;DR

• Meta is “obedient”: it finds whoever triggers the event you pick. Optimise on start trial and you get trial-starters, including impulsive ones who cancel within the hour.¹²
• The event needs volume and quality. Start trial has the volume. Purchase has the quality, but it is often too expensive and too delayed for a young app.³
• Qualified trial: send the trial event only if it isn’t cancelled within ~1–2 hours. That’s the default recommendation when you’re starting out.⁴⁵
• Above ~$100K/month, move to backend-enriched events, e.g. a trial plus 3–4 sessions in the first 24 h. Send them server-to-server via the MMP and map them in Meta.⁴
• The event is locked when an ad set launches. Test events with two identical ad sets in one campaign that differ only in the event.⁶
• Don’t optimise on onboarding completion. Send the most important event within minutes of install.⁷

Details

Budget math (Anas Maqsood, Sep 2026). Meta needs ~50 conversions per week per ad set, not per campaign:³⁸

• $20 cost per trial → ≥$1,000/ad set/week ≈ $4K/month.
• $100 cost per purchase → ≥$5,000/ad set/week.
• Samet Durgun’s lower floor: at least 5 events a day per campaign.⁹ By Sep 2026, for 100K+/month spenders, he asks for 10 events a day in every ad set (What subscription apps spending $100K+/month on Meta have in common).¹⁰

Why trials leak. Anas sees trial→paid of 15–25% typically, 35%+ for very good apps. The fix is less about trial length and more about the event Meta learns from.¹ Samet’s example: if a younger audience gives cheaper trials that don’t convert 3–7 days later, “you’re burning money”.¹¹

Qualified trial definitions in use:

• Adapty sends the trial event after 2 hours if it wasn’t cancelled, and says some clients saw campaign performance improve.⁵ By Sep 2026 its Attribution product’s default was 3 hours, adjustable. Murat Menzilci pitches it for 7-day-trial apps that can’t use ROAS optimisation.¹²¹³
• Samet: “trial started and not cancelled within the same hour”. If you sell a yearly-with-trial and a weekly-no-trial plan that convert similarly, bundle “trial not cancelled in 1 h + purchase” into one custom event.¹¹
• Waiting the full 7 days for trial→paid is real, but the delay plus purchase-level budgets make it hard for new apps. A trial with a short delay “is the real event”, just cleaner.⁴

What purchase optimisation does to your funnel (Samet’s experience). Purchase campaigns bring far more intent. Organic install→paid of 2% can become 10–20% on a Meta purchase campaign, and a 10% trial rate can become ~30% on a trial campaign. CPI usually rises a lot, up to ~5× the install-campaign CPI. A few accounts see similar CPIs either way.¹⁴

Cheap trials vs valuable trials (Murat Menzilci, Sep 2026). Two users can both start a trial, one cancelling at once and one converting to annual. Send plain trial events and Meta treats them as the same audience. His slide: campaign A had the cheaper cost per trial (~$8), but campaign B, with dearer trials, had the better LTV and ROI. More signals are not better signals.¹⁵¹⁶ The next step up is a predicted-LTV value sent with the event, which tells Meta to find valuable users rather than trial-starters. Adapty computes and sends pLTV itself.¹⁷¹⁸ Samet’s caveat: pLTV hasn’t always helped in his accounts, because the model itself has to be sound.¹⁹

Testing events. You can’t send Meta a sequence of events per user and have it learn from all of them. Pick one. To compare, launch one campaign with two identical ad sets (same ads), one on start trial (control) and one on qualified trial. Then carry the winner into creative testing.⁶ Keep it simple: a simple setup that works beats a complex one that doesn’t.²⁰

Diagnosis. If install→trial is low, look at onboarding first. But the cause can also be the event: Meta may be finding the best trial users rather than the best paying users.²¹

Disagreements / caveats

• Steve P. Young’s starter advice is plain start-trial optimisation with a 50-trials/week budget (How much Meta budget does an app need? (the 50-events math)). The qualified-trial view says that’s fine for volume but leaks quality. The two fit together: start-trial first, qualified trial once volume allows.
• Both guests spoke on Adapty’s channel, and Adapty sells qualified-trial events. The “performance improved” claim is unquantified.
• Anas says the 50/week learning threshold matters only for evergreen campaigns, not test ad sets (see Testing campaigns vs evergreen campaigns for app ads on Meta — forcing spend and graduating winners).

See also

• Signal engineering — auditing and shaping the conversion events ad platforms optimise on — audit what actually reaches Meta first
• SKAN, AEM and CAPI — how app conversions reach Meta after ATT — how the event reaches Meta after ATT
• Running paid ads to a web2app funnel — the same event ladder for web funnels
• What subscription apps spending $100K+/month on Meta have in common — the wider 100K+ playbook
• Anas Maqsood, Samet Durgun, Murat Menzilci

Footnotes

1. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 03:57 — Anas Maqsood ↩ ↩²

2. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 04:48 — Anas Maqsood ↩

3. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 07:15 — Anas Maqsood ↩ ↩²

4. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 08:57 — Anas Maqsood ↩ ↩² ↩³

5. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 06:25 — Murat Menzilci ↩ ↩²

6. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 10:41 — Anas Maqsood ↩ ↩²

7. LTV mastery: Getting high-value subscribers from Meta @ 19:18 — Samet Durgun ↩

8. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 15:31 — Anas Maqsood ↩

9. LTV mastery: Getting high-value subscribers from Meta @ 13:48 — Samet Durgun ↩

10. Scaling Subscription Apps Past $100K MRR: Advanced UA Tactics for Subscription Apps @ 25:03 — Samet Durgun ↩

11. LTV mastery: Getting high-value subscribers from Meta @ 18:27 — Samet Durgun ↩ ↩²

12. Scaling Subscription Apps Past $100K MRR: Advanced UA Tactics for Subscription Apps @ 20:18 — Murat Menzilci ↩

13. Scaling Subscription Apps Past $100K MRR: Advanced UA Tactics for Subscription Apps @ 46:57 — Murat Menzilci ↩

14. LTV mastery: Getting high-value subscribers from Meta @ 21:00 — Samet Durgun ↩

15. Scaling Subscription Apps Past $100K MRR: Advanced UA Tactics for Subscription Apps @ 05:10 — Murat Menzilci ↩

16. Scaling Subscription Apps Past $100K MRR: Advanced UA Tactics for Subscription Apps @ 09:42 — Murat Menzilci ↩

17. Scaling Subscription Apps Past $100K MRR: Advanced UA Tactics for Subscription Apps @ 07:05 — Murat Menzilci ↩

18. Scaling Subscription Apps Past $100K MRR: Advanced UA Tactics for Subscription Apps @ 42:36 — Murat Menzilci ↩

19. Scaling Subscription Apps Past $100K MRR: Advanced UA Tactics for Subscription Apps @ 41:47 — Samet Durgun ↩

20. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 12:19 — Anas Maqsood ↩

21. Why Your Meta Campaigns Attract Users Who Never Pay | Anas Maqsood @ 39:11 — Anas Maqsood ↩