Verdict: The Litter-Robot 4 is more reliable and has a proven long-term track record; the PetKit Pura Max 2 is a strong alternative at half the price for single-cat households willing to trade some reliability for significant savings.
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Winner: Litter-Robot 4
Spec-by-spec comparison
Litter Robot 4
PetKit Pura Max 2
Price
$699
$299
Mechanism
Rotating globe sift
Drum rotation sift
App Subscription
$29.99/yr (full features)
Free
Weight Scale
No (uses time/frequency)
Yes — per-cat weight
Multi-Cat Support
Excellent
Good (up to 3 cats)
Reliability Track Record
Excellent — years of iteration
Good — newer hardware
Litter Robot 4
What works
Proven reliability across multiple product generations
Robust multi-cat performance
App usage pattern monitoring can detect health anomalies
What doesn't
Costs $699 — nearly twice the PetKit
Full app features require $29.99/year subscription
Consumable liners are branded and recurring
PetKit Pura Max 2
What works
Less than half the price: $299 vs $699
Cat weight scale for longitudinal health monitoring
No subscription required for app features
What doesn't
Younger hardware with less refined sifting reliability
PUREZONE pods add $50-70/year in consumables
Customer support and warranty infrastructure less established
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