VerlumoAIRealistic AI voices for narration and dubbing.
View detailsSignalWire provides programmable voice and video APIs for communications apps. It was built by the creators of FreeSWITCH, and it offers voice, messaging, video, and AI voice agents on one platform with transparent per-minute pricing.
Key Features
- Programmable voice and video APIs
- AI voice agents with flat pricing
- SIP, WebRTC, and PSTN support
- Messaging APIs
- Call recording and conferencing
- Built by FreeSWITCH creators
Pricing
| Plan | Price | Details |
|---|---|---|
| AI Agent Runtime | $0.16/minute | Full-stack AI voice runtime, including STT, LLM, and standard TTS. |
| Voice API outbound | $0.0080/minute | US local outbound voice calls, per minute. |
| Voice API inbound | $0.0066/minute | US local inbound voice calls, per minute. |
| SIP / WebRTC | $0.0030/minute | SIP and WebRTC voice transport, per minute. |
Prices as listed in 2026 research. Always check the official site for the latest price — plans change. Free plan: No free plan — paid plans only.
Best for: voice-heavy apps and AI voice agents that need predictable pricing.
Popular with: Developers, Business Owners, Marketers
Popular with: Developers, Business Owners, Marketers
How it works
The platform's AI agent runtime costs a flat $0.16 a minute, which includes speech recognition, language model orchestration, and text-to-speech. Voice transport is billed separately at standard rates, so the all-in cost is around $0.163 to $0.168 a minute.
SignalWire is best for developers building voice apps and AI agents who want clear, predictable pricing. A free trial is available, and the platform is known for good call quality and developer-friendly documentation.
Pros and Cons
✓ Pros
- Flat, predictable AI agent pricing
- Built by FreeSWITCH creators
- Transparent per-minute rates
✗ Cons
- No free plan, only a limited trial
- AI agent runtime is pricey at $0.16 a minute
- Smaller ecosystem than Twilio
Frequently Asked Questions
Is SignalWire free?
No — SignalWire has no free plan. Pay-as-you-go; AI agent runtime $0.16/minute.
What is SignalWire best for?
voice-heavy apps and AI voice agents that need predictable pricing.
What kind of tool is SignalWire?
SignalWire is a Voice & Audio tool on VerlumoAI.
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View detailsLast reviewed: November 2026