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Web API

AI characters for any stack

Custom engine, browser game, mobile app or backend service: call the same characters you design in Neocortex over a simple REST API.

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  • Free plan
  • No credit card
  • Unity, Unreal, Godot, Web SDK and Web API
Cora, the Neocortex AI character, waving hello

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Get started

From zero to a talking character in Web API

  1. 1

    Design your character

    Build and test it in the visual editor.

  2. 2

    Create an API key

    Generate a key in the dashboard and keep it on your server.

  3. 3

    Send a message

    POST to the chat endpoint with your character and the player's message, and read the reply.

Requirements

  • Any language that can make HTTPS requests
  • A free Neocortex account and API key
Read the Web API docs

What you get

Built for Web API developers

01

Chat

Send a message and get the character's reply with context.

02

Streaming TTS

Speech streamed as it is generated.

03

Speech-to-text

Transcribe player audio in the character's language.

04

Sessions

Session IDs and paged history keep conversations going.

05

Actions and emotions

Replies carry actions and emotion tags for your game logic.

06

Any engine

Custom engines, web, mobile and backend services.

How it works

Characters you design, not prompts you babysit

  • Personality, emotion, knowledge and world are nodes you connect, not prompts you rewrite.
  • Intents and actions turn what a player says into something your game does.
  • Test every character in the browser for free before it reaches your engine.
neocortex.link/dashboard/characters
Neocortex visual character editor: emotion, personality, accent, language, voice and knowledge nodes connected to an agent, with intents mapped to in-game actions

What Our Customers Say

Discover what creators are saying about building with Neocortex.

After trying several Smart NPC providers, I came across Neocortex while looking for a stateful conversational AI solution for our Virtual Education platform. Neocortex stood out and topped all our key considerations.

Vallikat Peethamber
Managing Director

Neocortex opened scalable solutions for our VR platform, letting us create scenarios that make training more immersive. Keeping AI agents within clear boundaries is hard, but Neocortex handles it very well and makes customization easy.

Ottó Farkas
IT Specialist / Project Manager

In classroom practice, Neocortex and its action-based mechanism provide students with an out-of-the-box way to bridge conversational agents into software and hardware-based interaction design workflows.

Hongming Li
Lecturer / Instructor

I found out about Neocortex while I was working on my final-year project, and the platform's ease of integration and accessibility enabled me to seamlessly implement smart NPCs in my application. Highly recommend it!

Angela Pellillo
Backend Developer

Neocortex was the first step in bringing LLM-powered NPCs into a real Unity3D prototype, fast-tracking development and growing my TikTok account from 0 to 4000 followers within a month!

Brandan Chen
Associate Game Producer

After trying several Smart NPC providers, I came across Neocortex while looking for a stateful conversational AI solution for our Virtual Education platform. Neocortex stood out and topped all our key considerations.

Vallikat Peethamber
Managing Director

Neocortex opened scalable solutions for our VR platform, letting us create scenarios that make training more immersive. Keeping AI agents within clear boundaries is hard, but Neocortex handles it very well and makes customization easy.

Ottó Farkas
IT Specialist / Project Manager

In classroom practice, Neocortex and its action-based mechanism provide students with an out-of-the-box way to bridge conversational agents into software and hardware-based interaction design workflows.

Hongming Li
Lecturer / Instructor

I found out about Neocortex while I was working on my final-year project, and the platform's ease of integration and accessibility enabled me to seamlessly implement smart NPCs in my application. Highly recommend it!

Angela Pellillo
Backend Developer

Neocortex was the first step in bringing LLM-powered NPCs into a real Unity3D prototype, fast-tracking development and growing my TikTok account from 0 to 4000 followers within a month!

Brandan Chen
Associate Game Producer

From idea to playable character in a weekend

Game-jam teams use Neocortex to put talking, acting AI characters into playable games within a single weekend.

Read a game jam story

FAQ

Neocortex for Web API: common questions

What can I build with the Neocortex Web API?

AI NPCs in custom engines or browser games, chat companions in web and mobile apps, and backend services that coordinate AI characters.

How do I authenticate?

Send your API key in the x-api-key header. Keep keys on your server, never in a shipped client.

Does the API support voice?

Yes. The API includes streaming text-to-speech and speech-to-text.

Is there a free tier?

Yes. Neocortex has a free plan with monthly credits.

Comparing tools?

How Neocortex compares for Web API teams

ElevenLabs Agents alternative

ElevenLabs Agents is a voice pipeline for web, mobile and phone. Games need more: a stable SDK in every engine you ship, characters that act, and costs that do not grow with every minute of play.

Hume EVI alternative

Hume's documentation says its EVI and TTS APIs are being sunset on November 13, 2026, with account data deleted afterwards. Neocortex gives your characters a new home with voice in and out.

Inworld AI alternative

Inworld moved its focus to voice and inference for consumer apps and retired Character Studio. Neocortex keeps character design visual, game-first and in your engine.

Make your first API call

Free plan, no credit card. Build a character in the browser and talk to it in minutes.

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