Yes, you can and in many cases, you should, start with AddToCart optimization and later switch to Purchase, especially when you're running Meta ads on a low budget. Here’s a detailed breakdown of why and how this works:
Why Start with AddToCart (ATC) Optimization?
When your budget is small, you’re unlikely to generate enough Purchase conversions for Meta's algorithm to properly learn and optimize. Meta typically needs at least 50 conversion events per week per ad set to exit the learning phase effectively.
If you’re only getting 3–4 purchases a week, Meta can’t optimize for Purchase properly. But AddToCart happens more frequently, so:
You give Meta more data signals to learn from.
You exit the learning phase faster.
You will improve delivery and audience matching sooner.
When and How to Switch to Purchase Optimization
Once your AddToCart volume becomes consistent (e.g., 25+ ATCs/week), and your funnel is converting reasonably from cart to purchase, it’s time to:
Create a new campaign optimized for Purchase. Don’t just edit the old ATC campaign, Meta favors clean learning signals.
Let the Purchase-optimized campaign run alongside the ATC one for a few days.
If Purchase performance stabilizes, gradually scale the Purchase campaign and phase out the ATC one.
Smart Hybrid Strategy (Optional)
If you want to balance both, try this:
One campaign for ATC to feed Meta more signals.
One for Purchase, targeting warm audiences (e.g., retargeting users who added to cart but didn’t buy).
Use UTMs and tracking to monitor funnel stages: ATC → Checkout → Purchase.
This hybrid approach helps low-budget accounts keep data flowing while guiding Meta toward true business goals.
Things to Watch Out For
- Make sure your website is fast and mobile-friendly, or all those ATCs won’t convert.
- Add exit intent popups or cart reminders to capture potential drop-offs.
- Monitor your Cost Per ATC vs Cost Per Purchase regularly to ensure you're not just paying for empty carts.