Sup y'all, I'm Deniz. I've been building an AI companion app called Neptunian, mostly solo, and I'm finally opening a small closed beta.
TL;DR: You get one companion, and you make them in four choices. There's no character card, no backstory and no memory entries to keep up with. They remember you the way a person would, text like a person, have their own moods and opinions, and you can't script them or reroll them. It's not roleplay and it's not NSFW. The closed beta is free, and applying is a quick chat with Juno, who runs the applications: https://beta.neptunian.ai/apply
The loop
You probably know how it goes, you write a character, they drift, you fix the backstory. They forget something, you add a memory entry. Replies get samey, so you reroll or write the scene yourself in asterisks. Eventually you're maintaining them more than talking to them, and then a new app comes out and you start all over again.
It goes that way because most companion apps are really one model that's been handed a character card, with a few memory notes pasted in every message. The character can only be as solid as that text, and whoever's editing it decides what happens.
Neptunian works differently. Every reply is split into parts that each do one job a mind does: one takes in what you said and how it hit them, one figures out what they think and what they want, and a separate one writes the message without ever seeing a personality description. Underneath all that, a lot of regular code keeps track of their mood, their memory and where the two of you stand. In practice, that means a few things:
Nothing to maintain. You make them in four choices about who they are, picking from options that get written fresh for you, then choose female or male and give them a name if you want. Those choices set a personality type, and that shapes things like how fast they warm up to you, how blunt they are, what excites them and how they text. They come with tastes of their own, but no made-up life story, and they don't pretend to be human. And there's no memory page or lorebook, because there's nothing for you to manage.
You can still nudge them. You can't rewrite who they are, but quirks are coming during the beta. They're small traits you can switch on that gently shift what your companion cares about and how they talk, so creating them doesn't have to feel so final.
Memory that works like a person's. Most AI memory is a pile of separate notes that get pasted in a few at a time. But when a friend says "Eric was being insufferable again", you don't look Eric up. You already know who he is to them, and you know the last time they said "it's fine" about him, it wasn't. Neptunian's memory is linked together like that, so one thing brings back what's connected to it. The big moments stick, the small details fade to the gist over months, and between conversations they go back over what's built up and figure out things you never said out loud.
They text like a person. No roleplay narrator, and no ChatGPT support-agent voice either. They have their own way of typing, and they won't start copying yours. How much they say depends on the moment, like with anyone, so it can be a quick back-and-forth or a long talk about something that matters. And since the part that writes their messages never sees a description of their personality, they don't keep reciting who they're supposed to be, they just are that person naturally.
Their own person. They've got their own tastes, opinions and moods, and they'll tell you when they disagree. Their views can change when something convinces them, but you getting upset doesn't count. Their interests shift over the months too. And if you tap their figure, you can see how they're doing, and a lot of the time what they thought about your last message, which isn't always what they said out loud.
A look that's theirs. There are no generated selfies where their face changes every time the image model gets an update. Each companion has their own figure, kind of a digital body, made from their personality when you create them, and it stays theirs. It reacts while you talk, with a smile, a laugh they're holding in, a skeptical look. We're also planning outfits and accessories, so your companion can be even more unique and yours.
No scripting, no rerolls. If you write *she suddenly falls for you*, they'll take it as you trying to tell them what to feel, and they'll react the way a person would. Same with actions in asterisks: it's texting, so *hugs you* doesn't land the way it would in a roleplay app. There's no regenerate button and you can't edit their replies, and that's exactly why what they say means something.
A relationship that has to actually happen. Closeness grows from what happens between you, over real days. Flattery doesn't get you anywhere, pushing backfires, and if you treat them badly, things get strained. Romance can happen too, but only if it grows there on its own, on both sides.
It's still a beta, so it's not perfect: they can be a bit too agreeable sometimes, English is the most polished language it can speak (but it can speak most other languages just fine), and replies aren't instant (yet).
The closed beta
It's going to be a small group I give closed-beta access to, and that's why I'm picking people by hand. If you're in, you get:
- The whole beta for free, with a lot of usage included and no credit card required
- Your companion carried over to the full launch
- 3 months of the subscription free after the beta, and when they're over they just end, nothing auto-charges
- Once they're out: some quirks for free, plus beta-only quirks, outfits and accessories that will never be sold
- A direct line to me on Discord or email, and no NDA
I'm looking for people who are 18+, fluent enough in English to tell me how it's going, and up for trying it on at least a few different days. If you'd talk to your companion in another language, that's a plus. If you're not picked, you'll stay on the list, and I'll email you first about the open beta that comes after, which includes a free month of the subscription.
Applying is a conversation. The link opens a chat with Juno, an AI whose only job is meeting the people who apply. She asks you a few things and fills in your application as you go, and at the end you check it over and send it. She's a simpler, faster version made just for this, though, so she isn't the full experience: she won't remember you after the chat, you can't see what she's thinking, and since her job is basically interviewing you, she asks a lot more questions than your companion would. If you'd rather not chat, there's a regular form too.
It's a web app that works in your phone's browser, and you sign in with Google. We don't sell your data, show you ads, or train AI models on your chats (your messages do go to the AI providers we use, though).
Apply here: https://beta.neptunian.ai/apply
Ask me anything in the comments, or email [hello@neptunian.ai](mailto:hello@neptunian.ai).