Inworld AI

Inworld AI is a developer platform for building AI-powered non-player characters (NPCs) in games and interactive experiences. Founded in 2021, Inworld has raised more than $117 million at a $500 million valuation from investors including Lightspeed Venture Partners, Founders Fund, Kleiner Perkins, Intel Capital, CRV, and Microsoft's M12 fund, and provides the infrastructure to create characters that respond to player conversation, remember past interactions, and behave consistently with their defined personality.

What Inworld Enables

Emotionally expressive characters — Inworld's character engine generates not just dialogue but emotional state — characters can be curious, suspicious, friendly, or frightened, and their emotional state changes based on what the player says or does. This affects voice tone and behavioral choices.

Long-term memory — Inworld characters remember prior conversations across sessions. If you told a character your character's name in session 1, they remember it in session 10. Characters can hold grudges, build relationships, and evolve.

Goals and motivations — Characters have defined goals they pursue (guard this location, find information, protect their family) and make decisions aligned with those goals. Players can discover and engage with character motivations through dialogue.

Safety and guardrails — Inworld includes content moderation layers so characters stay appropriate for the game's rating, even under adversarial player inputs.

Engine integrations — Inworld provides SDKs for Unity, Unreal Engine, Roblox, and custom game engines. Voice synthesis is powered by Inworld's own Realtime TTS models — ranked #1 on independent TTS quality benchmarks in 2026 — with third-party providers like ElevenLabs also usable as alternatives for voiced NPCs.

Use Cases

Inworld is used by game developers, interactive film studios, and experience designers. Notable use cases include AI game masters, companion characters in RPGs, and interactive museum guides.

Pricing

Inworld offers a free On-Demand tier for evaluation and prototyping (includes limited TTS minutes and access to 100 stock voices), plus paid credit-based plans: Creator ($25/month), Builder ($100/month), Developer ($300/month), and Growth ($1,500/month), with custom Enterprise pricing above that. In June 2026, Inworld cut prices more than 50% across TTS, STT, and LLM usage in response to cost pressure across the consumer AI market, with per-character TTS rates now starting around $10–15 per million characters at mid-tier volumes.

Pricing

Inworld uses purely usage-based pricing rather than subscription tiers — for example, Inworld TTS runs $5 per million characters (standard voice) or $10 per million characters (highest-quality voice). Safety, Memory, and Knowledge features are included at no additional cost on top of usage. On-premise/custom deployments are quoted directly.