Inworld

What is Inworld?

Inworld is a platform for adding realtime voice and language models to consumer apps. Through one API and a web playground you can use text to speech (TTS-2 and the faster TTS-2 Flash), speech to text (STT 1), speech to speech through a Realtime API, and LLM inference across more than 100 hosted models. The voice side includes custom voices, instant voice cloning, professional voice clones, voice design, steering, speaking-rate and temperature controls, and timestamps. Billing works from credits: you choose a plan, receive credits equal to its monthly price, and spend them across voice and inference usage. Unused credits on paid plans roll over for up to 3 months. TTS is billed per million characters, with On-Demand at $25 for TTS-2 and $15 for TTS-2 Flash, and higher tiers lowering the rate. The On-Demand plan is free to start and includes up to 70 minutes of TTS, and paid plans run from Creator at $25/mo to Growth at $1,500/mo, plus custom Enterprise terms.

Use cases

• Add text to speech to an app
• Build realtime voice agents
• Transcribe speech with an API
• Clone or design custom voices
• Create AI companion characters
• Run open LLMs through one inference API
• Produce audio for content projects

Who it's for

• Developers
• Consumer app teams
• Game developers
• AI startups

Why use Inworld

• Voice and language model inference come from one provider, which means fewer vendors and one bill.
• Per-character and per-hour usage pricing lets you start small and pay for what you use.
• Paid-plan credits roll over for up to 3 months, which softens uneven monthly usage.
• A playground lets you try voices and models before writing integration code.

Inworld features

• TTS-2 and TTS-2 Flash text to speech
• STT 1 speech to text
• Speech-to-speech Realtime API
• LLM inference on 100+ models
• Custom voices, voice cloning and voice design
• Steering, speaking rate and temperature controls on TTS
• Timestamps and custom pronunciation
• TTS Playground with workspace sharing and team management
• Volume discounts on higher tiers
• GDPR and SOC 2 Type II on every plan

How to get started with Inworld

1. Open the Inworld playground to try voices and models.
2. Create an account on the On-Demand plan and generate an API key.
3. Call the TTS, STT, Realtime or LLM endpoints from your application.
4. Monitor credit use on the Billing page and top up or auto-reload as needed.
5. Move to a paid tier when you need lower rates, more voices or higher concurrency.

Inworld limitations

• On-Demand includes about 70 minutes of TTS and 100 custom voices
• TTS Playground requests are capped at 2,000 characters on On-Demand
• Some premium LLM models and asynchronous transcription need a payment method on file
• HIPAA and BAA, ZDR and professional voice cloning are add-ons or higher-tier items
• A payment failure that exhausts retries downgrades the account to On-Demand

Inworld pricing

Yes, Inworld has a free plan. Paid plans start at $25 per month, according to the official pricing page on 24 Oct 2026.

Inworld plans

• On-Demand

  $0

  pay as you go

  • Up to 70 min TTS included
  • 100 custom voices
  • 2 professional voice clones
  • 100+ LLM models via Inworld Inference
  • Commercial license
  • Community support

• Creator

  $25/mo

  • $25 in credits per month
  • Up to 33% off TTS & STT rates
  • 500 custom voices
  • 4 professional voice clones
  • Team management

• Builder

  $100/mo

  • $100 in credits per month
  • Up to 40% off TTS & STT rates
  • 3,000 custom voices
  • Increased concurrency limits

• Developer

  $300/mo

  • $300 in credits per month
  • Up to 47% off TTS & STT rates
  • 10,000 custom voices
  • 25 professional voice clones
  • Priority email support

• Growth

  $1,500/mo

  • $1,500 in credits per month
  • Up to 53% off TTS & STT rates
  • 30,000 custom voices
  • Higher API concurrency & limits
  • ZDR, HIPAA & BAA (add-ons)

• Enterprise

  Custom

  • Price match available
  • Custom limits
  • SLA & DPA
  • EU & India data residency
  • Dedicated AM & Slack channel

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

Inworld alternatives

The main Inworld alternatives listed on Debuly are ElevenLabs, Cartesia, Deepgram, Together AI, Groq and Outspeed. The table compares pricing and platforms; order is A–Z.

1. 

   Cartesia

   Voice AI platform with Sonic text-to-speech, Ink speech-to-text and managed voice agents, priced by credits and minutes.

   Audio and voiceDeveloper platformsAutomation and agents
   FreemiumVisit Cartesia (official site)
2. 

   Deepgram

   Voice AI platform with speech-to-text, text-to-speech and Voice Agent APIs, available as a managed API, in-VPC or self-hosted.

   Audio and voiceDeveloper platformsAutomation and agents
   FreemiumVisit Deepgram (official site)
3. 

   ElevenLabs

   AI audio platform for text to speech, voice cloning, dubbing, transcription, music and conversational voice agents, via app or API.

   Audio and voiceAutomation and agentsVideoDeveloper platforms
   FreemiumVisit ElevenLabs (official site)
4. 

   Groq

   GroqCloud inference API that serves open models such as GPT-OSS and Whisper on Groq's LPU hardware, billed per token.

   Developer platformsAudio and voiceCoding
   FreemiumVisit Groq (official site)
5. Ou

   Outspeed

   Realtime voice AI API and text-to-speech for adding natural-sounding voice agents to web and mobile apps.

   Developer platformsAudio and voice
   PaidVisit Outspeed (official site)
6. 

   Together AI

   AI cloud for running open-source models through serverless and batch inference, dedicated endpoints, GPU clusters and fine-tuning.

   Developer platformsCoding
   PaidVisit Together AI (official site)

Inworld FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from inworld.ai · fetched 24 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

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