Mem.ai is AI-powered notes and memory and Perplexity AI is AI search engine. We compared both — and added Lucy OS1 to the mix so you can see the full picture.
TLDR:Mem.ai and Perplexity AI are both capable tools in their respective categories. Neither offers persistent cross-session memory, automatic calendar and email awareness, or the always-on working presence that modern knowledge workers need. Lucy OS1 was built specifically for this gap — it remembers your context across every session, reads your live calendar and inbox, and stays present alongside your work. Both Mem.ai and Perplexity AI are solid for their core use cases; Lucy OS1 is the alternative if you want an AI that genuinely knows you.
MEM.AI · MEM LABS
AI-powered notes and memory — "AI that gets smarter the more you use it."
Pricing: Free; Mem Pro $14.99/month
PERPLEXITY AI · PERPLEXITY AI
AI search engine — "Ask anything."
Pricing: Free; Pro $20/month
| Feature | Mem.ai | Perplexity AI |
|---|---|---|
| Voice conversation |
No
Mem is text-only; no voice input or output
|
Limited
Perplexity has voice input on mobile but is primarily text-first
|
| Calendar integration |
No
No calendar integration
|
No
No calendar integration
|
THERE IS A THIRD OPTION
While both Mem.ai and Perplexity AI are strong in their domains, neither has the Neural Memory that Lucy OS1 brings. Lucy remembers your projects, your calendar, and your preferences across every single conversation — without you having to repeat yourself.
Lucy outperformed Mem.ai on 3 features and Perplexity AI on 4 features in our full head-to-head comparisons. It reads your Google Calendar and Gmail before each session, and it is designed to stay open alongside your work — not just respond when you ask.
Try Lucy OS1 FreeCOMPARE MEM.AI WITH OTHER TOOLS
COMPARE PERPLEXITY AI WITH OTHER TOOLS
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