Inworld AI vs Smallest AI: Features, Pricing and User Reviews 2026

Inworld AI offers six plans to fit different needs. The On-Demand plan is free and includes up to 70 minutes of text-to-speech, 100 custom voices, and access to the Realtime API and LLM Router.

Paid plans start with Creator at $25 a month, then Builder at $100, Developer at $300, and Growth at $1,500 a month, each lowering usage rates and raising custom voice and concurrency limits. Yearly billing brings the effective monthly price down on every paid plan.

Standard text-to-speech is billed per million characters, starting at $25 and dropping to $12.50 on Growth, while speech-to-text is billed hourly from $0.15 down to $0.10.

Enterprise plans offer custom pricing, on-premises deployment, and rates as low as $5 per million characters.

Smallest AI uses a pay as you go pricing model for its Agents and Models. New users start with $10 in free credits and only pay for what they use afterward.

Agent calls cost between $0.09 and $0.21 per minute depending on the model used, and text messages cost $0.005 each. Add-ons include Knowledge Base storage at $3 per GB per user, Knowledge Base queries at $2 per 1,000 queries, and PII removal at $0.01 per minute. Renting a phone number costs $10 per month.

For voice models, Lightning text to speech costs $0.175 per 10,000 characters, while Pulse speech to text starts around $0.003 per minute.

Larger teams can choose the Enterprise plan, which offers custom pricing, dedicated infrastructure, priority support, and compliance features, with agent calls priced as low as $0.05 per minute.