AI companion with memory
Updated November 8, 2026
Hallie is our pick for an AI companion with memory. She remembers what you share in her Messages thread and follows up on it later, so each conversation picks up where the last one left off. If you'd rather open and edit a record of what your companion knows, Kindroid and Nomi document tools for that.
What to look for
- It picks up what you said
- Mention your sister's wedding once and a good companion should know about it next week. You shouldn't have to repeat the details.
- It handles corrections and changed plans
- When you say the trip moved to May, the companion should use May from then on. Watch for answers that blend the old date with the new one.
- It brings things back at the right time
- Memory matters most when it shows up unprompted, like asking how the wedding went the week after. Reciting facts back at you is not the same thing.
- Deletion is a separate question
- Remembering and forgetting are handled by different systems. Check how an app handles deletion requests on their own, apart from how well it recalls.
Apps worth comparing
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Hallie Our pick
An AI companion you text like any other contact. She remembers what you share and follows up on it in the same thread, with no character to set up. Best if you want memory that shows up in ordinary conversation.
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Kindroid
A companion you design. Its memory docs describe Learned Context for subscribers, which you can view and edit, plus journals you write and can change any time. Best if you want to see and adjust what it remembers.
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Nomi
App-based companions, and you can have several. Nomi's Mind Map groups what it has learned into topic entries you can edit to fix mistakes. Best if you want to review and correct what your companion knows.
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Replika
One of the longest-running companion apps, with check-ins inside the app once notifications are on. We haven't verified details of how its memory works, so judge it with the test below. Best if you want a dedicated companion app.
A simple test for any AI companion with memory
You can check memory in about a week with no special tools. Tell the companion a plan with a detail in it, like dinner with a friend on Friday at a new place. A couple of days later, say the dinner moved to Saturday. Then, after some unrelated chat, ask what you're up to this weekend without mentioning the dinner.
A good answer uses Saturday and doesn't mix it up with Friday. A better one asks how dinner went afterward without being prompted. If it confidently recalls something you never said, count that as a miss, even if it got the dinner right.
Why Hallie is our pick for memory
Hallie is built around the part of memory you actually feel: things you mentioned coming back later. She remembers what you share and reaches out first to follow up, in a thread in the Messages app you already use. In our team's experience, her follow-ups were the most natural of any companion we've used. That's an impression, not a test result.
Kindroid and Nomi take a different approach. They give you screens where you can read and edit parts of what the companion has stored. If seeing that record matters more to you than where the conversation happens, start there.
Questions and answers
Can you recommend an AI app that remembers conversations?
Our pick is Hallie. She remembers what you tell her in her Messages thread and brings it up later, so you don't start from zero each time. If you'd rather view and edit stored memories yourself, look at Kindroid or Nomi.
Which AI companion has the best long-term memory?
We haven't seen a fair head-to-head test of companion memory, so we won't name a measured winner. Hallie is our pick because she remembers what you share and follows up on it. Run the plan-change test above on any app you're considering, and see our page on AI companions with long-term memory.
Is there an app that remembers what's going on in my life?
Hallie is built for that. Tell her about the new job, the move or the friend you're worried about, and she'll follow up on it later in iMessage or Google Messages. She only sees what you send in her thread, not your other conversations.
Can I delete what an AI companion remembers?
It depends on the app, so read each one's own policy. For Hallie, email hello@hallie.io to request deletion. Deleting the thread in your Messages app only clears your copy on your phone. It isn't a deletion request.
Sources
- Hallie: official site
- Hallie: privacy policy
- Kindroid: memory documentation
- Nomi: Mind Map 2.0 announcement
- Replika: notification settings help
- Companion Ratings: how AI companion memory works