1. Compliance: Synthflow positions itself as a voice AI solution for SMEs, making it more suitable for agencies and small businesses. However, it lacks key compliance certifications such as HIPAA, SOC2, and GDPR, making it unsuitable for larger companies that require these standards. Retell, on the other hand, meets the needs of both mid-market and enterprise clients with full compliance.
2. Pricing: Synthflow uses a subscription-based pricing model instead of a usage-based one, which requires purchasing a subscription to use the service—there’s no option for pay-as-you-go. This makes it less flexible for developers or companies in a trial phase. In contrast, Retell operates on a usage-based model, so you only pay for what you use at the end of the month. With Synthflow at $0.18/min compared to Retell’s $0.07/min, Retell is half the price.
3. Customizability: Synthflow is not developer-friendly, offers limited customization options, and doesn’t support custom LLMs. Retell, on the other hand, is highly customizable, developer-friendly, and comes with detailed, comprehensive documentation.
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