AI SUPPORTSOFTWAREBrowse 30 tools 
Side-by-side comparison
Compare audience fit, channels, integrations, knowledge sources, public pricing information, and operational considerations.
Both products appear in ai support agents and voice and contact-center ai and agent builders. That overlap gives you a starting point; it does not mean the products cover the same channels, workflows, or deployment model.
Developer platform for building, testing, deploying and monitoring production voice and chat agents.
Developers and startups building phone agents with APIs, webhooks and custom logic.
Explore its buying criteria: AI support agents · Voice and contact-center AI · Agent builders.
Full Retell AI profile and vendor sources · Checked 2026-09-02
Collaborative platform for designing, testing and deploying chat and voice AI agents for customer experience.
CX, product and design teams that need collaborative agent design, testing and channel deployment.
Explore its buying criteria: AI support agents · Voice and contact-center AI · Agent builders.
Full Voiceflow profile and vendor sources · Checked 2026-09-02
The table below preserves each vendor’s scope and qualifiers. An unlisted feature is unverified here; it is not a claim that the feature is unavailable.
Before you decide
Retell AI: Voice cost combines infrastructure, speech, model, telephony and optional per-minute features. Chat is charged per AI message. Phone numbers cost $2/month; 20 concurrent calls are included, with additional concurrency $8/month each. Use the selected configuration to estimate the monthly bill. Voiceflow: Usage-based billing for agency and partner workspaces; business pricing depends on deployment scope and self-serve or managed implementation. Ask for current plan, usage, collaborator and telephony charges before budgeting. Ask both vendors to quote the same expected workload, required channels, and implementation scope. Include required subscriptions and usage charges before comparing the total; the listed starting prices alone may cover different work.
The recorded sources for Retell AI include prompts; documents/knowledge bases; API tools; business systems. For Voiceflow, they include websites; documents; knowledge bases; APIs; structured data. Ask each vendor to demonstrate ingestion or live access for the exact system you use, with permissions and refresh behavior. A source missing from this directory is not proof that a vendor cannot support it.
Use the same sample of real support requests, approved knowledge, and escalation rules in both pilots. Can it cite or restrict answers to approved knowledge? What happens when the agent is uncertain? Which actions can it complete beyond answering? Record answer quality, completed tasks, human handoffs, and total cost in the buyer worksheet. Check these specific cautions before launch: Retell AI: Telephony, model, speech and other provider costs may be separate; technical integration work is expected. Voiceflow: Credits and external telephony/model charges apply; confirm included editors and production limits.
Record your requirements and pilot results in the buyer worksheet →
On a small screen, swipe the table to compare both products.
| Criterion | Retell AI | Voiceflow |
|---|---|---|
| Best fit | Developers and startups building phone agents with APIs, webhooks and custom logic. | CX, product and design teams that need collaborative agent design, testing and channel deployment. |
| Key capabilities | voice agent builder, drag-and-drop flows, call transfer, DTMF, transcripts, simulation testing, webhooks | visual conversation design, knowledge base, voice and chat, simulations, analytics, team collaboration |
| Company sizes | small, mid-market, enterprise, developer/startup | small, mid-market, enterprise, agency |
| Channels | phone, web chat, SMS, telephony | web chat, voice, phone, API, custom interfaces |
| Integrations | telephony providers, webhooks, REST APIs, CRM/helpdesk via APIs | Twilio, Vonage, Salesforce, Zendesk, APIs/webhooks |
| Knowledge sources | prompts, documents/knowledge bases, API tools, business systems | websites, documents, knowledge bases, APIs, structured data |
| Pricing model | Voice cost combines infrastructure, speech, model, telephony and optional per-minute features. Chat is charged per AI message. Phone numbers cost $2/month; 20 concurrent calls are included, with additional concurrency $8/month each. Use the selected configuration to estimate the monthly bill. | Usage-based billing for agency and partner workspaces; business pricing depends on deployment scope and self-serve or managed implementation. Ask for current plan, usage, collaborator and telephony charges before budgeting. |
| Pricing summary | Pay as you go: advertised voice range $0.07–$0.31/minute and chat from $0.002/message (USD). No base subscription commitment; selected models, telephony and add-ons can increase the total. Enterprise is quoted. | No current public monthly rate. Agency and partner users can start a free trial; business deployments require a pricing discussion. A managed enterprise deployment is likely to require a higher budget than a self-serve chatbot; confirm with a quote. |
| Free plan or trial | $10 in free credits to build and test; pay-as-you-go access has no commitment. | Free trial for agencies and partners, with no credit card required; business demos available. |
| Differentiator | Transparent usage entry point and production-oriented voice tooling for developers. | Strong collaborative design/testing workflow for both chat and voice agents. |
| Considerations | Telephony, model, speech and other provider costs may be separate; technical integration work is expected. | Credits and external telephony/model charges apply; confirm included editors and production limits. |
Developers and startups building phone agents with APIs, webhooks and custom logic.
Transparent usage entry point and production-oriented voice tooling for developers.
CX, product and design teams that need collaborative agent design, testing and channel deployment.
Strong collaborative design/testing workflow for both chat and voice agents.
Verify current pricing, limits, security, and required integrations directly with each vendor before purchasing.