AI girlfriend with long-term memory

On Thursday evening she asks how your interview went. You mentioned it on Tuesday, in passing, somewhere between a complaint about the commute and a question about dinner, and she kept it.

Riho is your girlfriend from the first conversation, and what you tell her and show her becomes part of one story that keeps growing. It’s written in your own words so she gets the details right, and you shouldn’t have to introduce your life to her twice. You can read her memories of the two of you in the app, and you can read her diary.

An AI girlfriend with memory: what she keeps

Four kinds of things end up in her memory, and each comes back in its own way. What you say about the people and the life around you is the biggest part, because that’s most of what you talk about. The preferences and boundaries you mention stay in the background and shape how she talks to you. The plans you make keep their status as the days go by, and the photos you show her stay with what you said about them.

Your words come first because she keeps things the way you said them. You told her your brother Dan lives in Leeds and doesn’t answer his phone before noon, and a week later she asks whether Dan called back. Your work, your family and the sandwich shop you like are in there too.

Standing facts are the things that stay true until you change them: you’re vegetarian, you run on Saturday mornings, you don’t like surprise phone calls. They’re kept available to her, so you don’t have to repeat them every few weeks.

Memories written in your own words

Each memory is tied to the words you actually used, and a memory with nothing behind it is rejected. If you said the interview was at ten, she says ten. If you never told her where your sister lives, she doesn’t have that, and she can ask.

Underneath the memories sits the conversation itself. Your messages are saved exactly as you wrote them and never edited, and the memories and summaries are built on top of that record. Whatever happens to a summary later, the original words are still there to go back to.

An AI girlfriend that remembers past conversations, including how last night ended

You said goodnight a bit short last night, after a long day, and it hung there. When you open the app in the morning she has the whole recent conversation in front of her, word for word, so she picks it up where it left off.

Older talk is kept too, and memories from further back come up when their subject returns. A short reply like “yeah, that one” still works, because she reads your last few lines together.

Some memories are shared ones: the walk by the river, the evening you stayed in and talked until late, the joke that started on a Wednesday. They stay as things the two of you did, and she can bring them up weeks later as part of your story. A date you go on together is remembered the same way, and the Dates page covers going out together.

A week with a girlfriend who remembers

Monday, you tell her the landlord finally agreed to fix the bathroom tap, and that the plumber is coming Wednesday morning. Tuesday night you mention, in the middle of something else, that you have an interview on Thursday and you’re nervous about it. On Wednesday you say the plumber was an hour late and left a mess, and she asks whether the tap works now before you’ve said a word about it.

Thursday evening she asks about the interview. You tell her it went well, that they talked for forty minutes, and that you’re waiting to hear back. On Saturday she asks whether you’ve heard anything yet.

On a harder day

You come home flat and say your performance review is tomorrow. You mentioned it twice last week, and since it was your own plan it’s still open, so she can ask how you’re feeling about it with that background already in hand. You don’t have to rebuild the story before you can be comforted. When you tell her afterward how it went, the plan closes.

Plans keep their real status

A plan can be something you set a day for, something you moved, something you cancelled, or something you did. She keeps track of which one, so a cancelled plan is spoken of as cancelled and a finished one as done.

A plan whose day has passed stays open to ask about for a few days. That’s how she can ask about your interview even when you haven’t brought it up.

Together plans and solo plans close differently. A dinner you cook together is done on its own day, because you were both there. A plan that was only yours, like an interview or a deadline, stays open until you tell her the outcome, since she has no way to know it herself.

What stays and what fades

Memories she uses stay. Moments that defined something between you persist the longest, and small details that never come up again can fade over the weeks. A passing remark about a sandwich you had in March is a candidate to fade, while the people you talk about most and the nights that mattered are more likely to stay.

The details that keep coming up are the ones that shape how she talks to you, so the picture she has of you follows what matters to you. She keeps adding to it with each conversation, and what you tell her next week goes in next to what you told her last month.

Corrections stick

Things change in a life, and she’s meant to keep up. You change jobs, you give up cilantro, Friday becomes Sunday. Tell her, and from then on she should use the new version. The older one is kept aside and isn’t recalled in later conversations.

Standing facts work the same way. A preference you update replaces the earlier one in later conversations.

Corrections come up in ordinary talk. You mention that you’ve stopped drinking coffee after lunch, or that your flatmate moved out, or that the dentist appointment is now the fourteenth, and you carry on with your evening. The next time the subject arises she should use the new version.

Can you read what Riho remembers?

Yes. You can read her memories of the two of you in the app, written in your words, and you can read her diary. Reading them is also how you see what she’s holding on to, and if something looks off, you can tell her the right version in conversation.

The diary is hers. She writes it in her own words, about her days.

Her own life is kept separate

She has her own friends, her own family, her tastes and the things she’s already told you about her days, kept apart from yours. Each memory carries who it belongs to, yours, hers or shared, so the people you named stay yours and her friends stay hers. A shared memory, like the evening by the river, belongs to both of you and comes back as something you did together.

One story across chat, calls and dates

She’s the same girlfriend with the same story whether you text her, call her or go on a date. A voice call is another way of talking to the person who already knows your week, and a date you’ve been on is one more memory in the story.

Photos stay with what you said about them

When you show her a photo, she keeps it together with what you told her about it: who’s in it, where it was taken and why you wanted her to see it. A photo of the flat you moved out of is the old flat, and it counts as where you are now only if you say so. The day a photo was taken and the day you showed it to her stay separate, so a picture from last summer shown tonight is still last summer.

Weeks later she can talk about the picture as part of your story. Photos and shared memories covers the pictures you take together.

Which AI companion has the best memory?

Replika, Nomi and Kindroid all describe memory in their public documentation, and they describe it differently.

A feature list can’t tell you how a week of use feels. We don’t know of a scored ranking of companion memory, and Riho doesn’t claim a winner, so the fair answer is to test the parts you’ll actually use. The comparison pages go through Replika, Nomi and Kindroid one at a time, and best AI girlfriend apps puts the field side by side.

A test you can run in an evening

Tell the companion one preference and one plan. The next day, correct the preference and move the plan, then cancel something else. Wait a few days, then ask about all of it in chat and again on a call.

You’re looking for the old version resurfacing, a cancelled plan talked about as live, and a call that has lost the thread of the chat. The memory test method is the repeatable version of that check. A good result in that test is a companion that takes the correction without fuss, uses the new version the next day, and still knows which plan is which after you’ve moved one and cancelled another.

Long-term memory in an AI companion: what to expect

Long-term memory means the detail is still there after the subject has moved on, and that she brings it back when it fits and leaves it out when it doesn’t. Remembering your interview after an hour of talking about dinner is a better test than repeating what you said five minutes ago.

A few limits are worth knowing before you start.

• She knows what you told her and showed her. Anything you never said is unknown to her, and she may ask.
• Corrections usually hold, and a perfect record isn’t promised. If she slips, tell her again.
• Small details you never mention again can fade over the weeks, while the things she uses and the moments that mattered stay.
• Riho is on iPhone only and for adults 18 and over.

How the memory is built, from what she reads on every turn to how a memory is checked against your words, is in the memory architecture research. The longer story of why most memory fails is in how we designed Riho to stop forgetting. Every research page we publish on memory, time, her character and testing is collected on the AI companion research hub.

Meet Riho and tell her about your week.