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Side-by-side facts to help you choose between voice agents or platforms.
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Voice Agent Platform
Robylon
AI customer-support agents for email, chat, WhatsApp and phone calls that connect to your helpdesk and take actions.
Enterprise Agent
Sierra
Enterprise AI agent platform for customer service across voice and digital support channels.
Highlighted rows differ between these picks
| Attribute | Robylon | Sierra |
|---|---|---|
| Platform type | Voice Agent Platform | Enterprise Agent |
| Pricing | Subscription pricing Free plan; Pro from $25/month; phone calls from Business at $180/month | Enterprise pricing Quote-based enterprise pricing |
| Test it | Free trial | — |
| Calls | Inbound, Outbound | Inbound |
| Human handoff | Yes | Yes |
| Setup difficulty | Medium | Enterprise |
| Use cases | Customer Support | Customer Support |
| Useful for |
|
|
| Integrations | ||
| Zendesk | — | |
| Freshworks | — | |
| Intercom | — | |
| Salesforce | — | |
| HubSpot | — | |
| Shopify | — | |
| — | ||
| Twilio | — | |
| Exotel | — | |
| Aircall | — | |
| +6 more across these tools — see each profile for the full list. | ||
Platform type
- Robylon
- Voice Agent Platform
- Sierra
- Enterprise Agent
Pricing
- Robylon
Subscription pricing
Free plan; Pro from $25/month; phone calls from Business at $180/month
- Sierra
Enterprise pricing
Quote-based enterprise pricing
Test it
- Robylon
- Free trial
- Sierra
- —
Calls
- Robylon
- Inbound, Outbound
- Sierra
- Inbound
Human handoff
- Robylon
- Yes
- Sierra
- Yes
Setup difficulty
- Robylon
- Medium
- Sierra
- Enterprise
Use cases
- Robylon
- Customer Support
- Sierra
- Customer Support
Useful for
- Robylon
- • Support teams automating tickets and calls together
- • Ecommerce order and returns questions
- • Helpdesk-connected escalation
- • Starting free on chat before adding voice
- Sierra
- • Enterprise support teams
- • Policy-aware customer agents
- • Complex support workflows
Integrations
| Robylon | Sierra | |
|---|---|---|
| Zendesk | — | |
| Freshworks | — | |
| Intercom | — | |
| Salesforce | — | |
| HubSpot | — | |
| Shopify | — | |
| — | ||
| Twilio | — | |
| Exotel | — | |
| Aircall | — |
+6 more across these tools — see each profile for the full list.
What would these cost to run?
Enter your call volume once and see Robylon and Sierra priced at the same usage, ranked alongside every other platform.