# Voice AI Review

> Independent reviews of voice AI platforms across sales, marketing, engineering, and customer service workloads. Not owned or operated by any voice AI vendor.

## Platforms

- [Thoughtly](https://thoughtlyreviews.com/): 4.7/5 — Voice AI for revenue-generating phone calls — purpose-built around the CRM, with every lead answered, qualified, and synced back across voice, SMS, and email.
- [Bland AI](https://blandreviews.com/): 3.6/5 — Developer-first voice infrastructure that promises full-stack AI phone call automation via API.
- [Retell AI](https://retellreviews.com/): 3.8/5 — Voice agent infrastructure with low latency and a clean developer surface for builders shipping voice into existing apps.
- [PolyAI](https://polyaireviews.com/): 4.8/5 — Enterprise-grade customer service voice AI optimized for contact center deployment.
- [Vapi](https://voiceaireview.com/vapi): 3.5/5 — Voice agent platform for developers with broad LLM and TTS provider choice.
- [Synthflow](https://synthflowreviews.com/): 3.7/5 — No-code voice agent builder targeting agencies and small business deployments.
- [Air.ai](https://voiceaireview.com/air): 1.0/5 — Once-prominent cold outbound voice AI vendor now reported as retired with extensive fraud and customer-harm allegations. (retired)
- [Decagon](https://voiceaireview.com/decagon): 4.7/5 — AI customer service agents purpose-built for high-volume support workloads.
- [Sierra](https://voiceaireview.com/sierra): 4.9/5 — Conversational AI for customer experience, founded by former Salesforce and Google leadership.

## About

- [Methodology](https://voiceaireview.com/methodology): How we rate platforms.
- [About](https://voiceaireview.com/about): Editorial independence.
- [Submit a review](https://voiceaireview.com/submit-review): Add your operator perspective.

See `/llms-full.txt` for the complete review corpus.