Retellai vs Vapi
Retellai scores 6.3 to Vapi's 5.5 among the voice agent platforms we rate, and is the better pick for 2 of the 4 kinds of buyer below.
Retellai wins, 6.3 to 5.5
Vapi charges $0.05 a minute for calls against Retellai's $0.07. Retellai holds ISO 27001 certification, which Vapi does not have. Retellai's AI answers in 55 languages; we could not find that figure on Vapi's site. Vapi lets you remove its branding on a plan and keeps an audit log; Retellai offers neither.
Pick Retellai if you need iso 27001 certification and more languages.
Pick Vapi if you want the lower per minute price and removable branding.
Best for
Who each one suits, decided on the criteria that matter to that buyer and the checked facts where the two differ.
- Price per minute of calls: Retellai $0.07, Vapi $0.05
- What the AI learns from: Website, files, notion, google_drive against Files
- ISO 27001: Retellai yes, Vapi no
How they score
Both are scored the same way, against the other voice agent platforms we rate, from facts on each vendor's own pages. Retellai leads on 3 of 7 criteria.
Where they differ
Every point where the two vendors' published facts disagree, with a link to where each fact was read. "Not published" means the vendor does not say either way.
Published by only one of them
Where they match (13)
Pricing, plan by plan
Every plan each vendor publishes, monthly and yearly where both are offered.
Retellai
Vapi
Pros and cons
From each tool's full review, written from the same checked facts.
Retellai
- Proprietary voice orchestration layer runs at approximately 600ms latency, making AI phone conversations feel natural rather than stilted.
- Supports multiple underlying LLMs including GPT-4.1, GPT-5, Claude 4.x, Gemini 3.x, and custom models, offering genuine flexibility competitors lack.
- Handles multi-turn conversations rather than simple single-question scripts, making it viable for complex call flows.
- Live demo page lets prospects actually receive a call from the AI, which is an effective and transparent way to evaluate voice quality.
- Covers a wide range of use cases including inbound support, outbound appointment reminders, lead qualification, and debt collection.
- Streaming RAG setup can automatically sync to website content, enabling dynamic knowledge base support for voice agents.
- Developer-friendly architecture appeals to technical teams that want to build and customize voice agents at scale.
- The company was founded in 2023, meaning the product and company maturity are still unproven compared to more established competitors.
- Knowledge base RAG feature is an add-on priced at $8/KB/month, which is not bundled and can add meaningful cost at scale.
- Performance and reliability data for complex or high-volume use cases remains limited due to the platform's early stage.
- Some use cases cited in research show mixed results, suggesting the platform delivers unevenly depending on the application.
Vapi
- Vapi achieves sub-500ms latency by handling all voice infrastructure between LLM, speech-to-text, and text-to-speech providers.
- The platform supports full LLM provider flexibility, allowing developers to swap between OpenAI, Anthropic, and others without rebuilding infrastructure.
- Speech-to-text and text-to-speech are modular, with support for Deepgram, ElevenLabs, and custom voice providers.
- Real-time monitoring is built into the platform, giving developers visibility into live call performance.
- Human handover and call routing are natively supported, making it viable for production customer-facing deployments.
- Enterprise Scale plan customers receive contractual uptime guarantees and a dedicated embedded engineer.
- The platform has demonstrated fast deployment timelines, with Ring reportedly going from zero to full inbound call volume in two weeks.
- Vapi requires significant technical fluency to set up and operate, making it inaccessible for most non-developer support teams.
- There is no native ticket management system, meaning it cannot function as a standalone helpdesk solution.
- Email automation is entirely absent from the platform, limiting its utility for full-service customer support workflows.
- Native integrations with major CRMs like Salesforce and HubSpot are not included out of the box.
- SMS and chat channels exist but are clearly secondary features, with the core product being voice-only.
- The API-first architecture means teams without engineering resources will struggle to unlock the platform's full capabilities.
Retellai vs Vapi: common questions
Which is better, Retellai or Vapi?
Retellai scores 6.3 and Vapi 5.5 out of 10 among the voice agent platforms we rate. Retellai is ahead on aI that answers your customers, security and privacy and integrations. Vapi is ahead on support and branding.
Is Retellai or Vapi cheaper?
Retellai's cheapest paid plan is $0.07/min and Vapi's is Usage-based (60+ min included). Compare what each plan includes below before going on price alone.
What can Retellai do that Vapi cannot?
On the facts both vendors publish: iSO 27001.
