Short answer: they blend modern language models with memory, voice, and visuals to create chats that feel fluid, personal, and fun. Below is the quick tour (tech made simple) plus tips to get the best experience.

The Engine: LLM + Memory = Natural Flow

At the core is a large language model (LLM) that understands context, tone, and intent. Apps layer a lightweight memory system on top—so your companion remembers favorites, inside jokes, and ongoing story threads. The result: fewer “robot” moments, more smooth back-and-forth.

• Language core: Keeps character, tone, and pacing consistent.
• Memory: Saves highlights (preferences, callbacks) and surfaces them later.
• Style guardrails: Prompts + safety rules keep scenes comfy and on-brand.

Voice, Images & Scene-Setting

Many apps now offer expressive voice calls (natural pacing, pauses, interruptions) and image support for looks or scenes. Combine quick scene prompts—“late-night walk by the beach”—with voice for instant immersion.

Comfort Controls You Can Trust

Good apps put you in charge. Content filters keep things respectful, profiles let you set boundaries, and memory tools let you reset or clear history anytime. Tip: define your vibe up front—“slow burn, playful teasing, shorter replies”—and your companion adapts quickly.

How to Pick the Right App

• Personality controls: Can you tune style, kinks, boundaries, and scenarios?
• Memory quality: Does it remember callbacks across sessions?
• Voice options: Multiple voices, expressive prosody, easy call start/stop.
• Images & rules: Clear guidance so you’re never guessing.
• Pricing: Free tier to try; premium for unlimited messages, voice, and custom looks.

What Premium Usually Unlocks

Feature	Free	Premium
Messages	Daily cap	Essentially unlimited
Voice calls	Trials	Long sessions
Images	Basic	Custom looks & galleries
Memory depth	Short-term	Richer long-term callbacks
Role-play tools	Simple prompts	Scenarios, safe words, personas

Pro Tips for Better Chats

• Set the vibe: “Playful, a bit jealous, quick replies.”
• Use callbacks: Reference a past moment to trigger memory.
• Scene cards: One-line setups guide pacing and mood.
• Switch to voice: When you want momentum or closeness.

Why This Feels So Real

Before each reply, the app pulls a few relevant moments from your history and includes them in the prompt. That’s how it remembers your favorite movie or a nickname—and why your chats feel continuous instead of “starting over.” Add light structure—“three messages of slow build, then a kiss”—and you get the pacing you want.

Tech & Ethics in a Nutshell

These experiences are designed for fun, creativity, and connection. Keep it consensual, stay within guidelines, and use the privacy tools (export/delete) when you want a fresh start. That balance—play + control—is what makes modern AI companionship click.