AI Companion Glossary
Every term that comes up around AI girlfriend apps, decoded with zero fluff. Tripped up by something in our rankings or the blog? It's in here. Everything in this category is 18+ only.
- AI companion Basics
- An app that chats as a chosen character with a persistent, personalized personality, often adding voice, images and memory. "AI girlfriend" and "AI boyfriend" apps are AI companions with a romantic framing. The ten apps we rank are all companions of some flavor.
- LLM (Large Language Model) Under the hood
- The AI model that writes a companion's replies. It predicts language from training patterns, which is why staying in character depends on how the app keeps feeding it the persona. Better LLMs hold a personality more consistently.
- NSFW Content
- Not Safe For Work: adult or explicit content. "NSFW-capable" apps allow it for adults 18+; app-store apps usually filter it out. We flag each app's policy in the Top 10.
- SFW Content
- Safe For Work: non-explicit content. "SFW-leaning" apps like Replika stay away from explicit territory by design, trading heat for a gentler feel.
- Persona Character
- The personality, look and backstory a companion holds. A strong persona stays consistent across a chat and, with memory, across sessions. Our characters page tours common persona types.
- Hearts / credits Pricing
- A pay-per-use currency some apps use instead of a flat subscription. Swipey AI uses hearts: you spend them on premium actions instead of a fixed monthly fee. Both models are legit; just make sure you can see the cost before you pay.
- Roleplay Feature
- Acting out a scene or scenario with a companion. Better apps keep the character inside the scene without you re-explaining where you are every message.
- Context window Under the hood
- How much recent conversation the model can hold at once. Bigger window means more of the current chat stays in mind before old lines drop off. Not the same as long-term memory.
- Memory Feature
- A system that stores details beyond the context window so a companion recalls them in future sessions. It's the single thing that most separates a companion from a plain chatbot.
- Image gen Feature
- Creating pictures of a companion from a prompt or her set look. On NSFW-capable apps this can include adult imagery for 18+ users. Quality varies a lot; Candy AI leads on it in our ranking.
- Voice / TTS Feature
- Text-to-speech that lets a companion talk. Good voice adds tone and warmth text can't, but only when it matches the character. A mismatched voice breaks the vibe faster than no voice.
- Character card Character
- A shareable bundle of a persona's traits and settings, common on community platforms. It's a starting template; the live chat is where the character actually forms.
- Jailbreak Content
- Trying to trick a filtered model into producing content it normally blocks. We don't recommend it: it's against most platforms' terms. Picking an NSFW-capable app built for adults is the honest route.
- Freemium Pricing
- Free to start with paid upgrades. Most companion apps are freemium. Free-tier generosity varies wildly; Character.AI's is the most open, while image-first apps gate the good parts.