vs
Zendesk AI agents vs Sierra
Zendesk AI agents scores higher overall (7.9 vs 7.6), but the right pick depends on what you need.
Choose Zendesk AI agents if…
Teams already on Zendesk that want AI agents inside the same helpdesk
7.9/10★★★★★Full review →Choose Sierra if…
Large enterprises that want a custom, branded AI agent with white-glove deployment
7.6/10★★★★★Full review →Side by side
| Zendesk AI agents | Sierra | |
|---|---|---|
| Overall score | 7.9/10 | 7.6/10 |
| Rank in category | #2 of 10 | #3 of 10 |
| Price | Free trial · from $55/agent/month | Paid |
| Free version | 14-day trial of Suite Professional | — |
| Platforms | Web, API | Web, API |
| Made by | Zendesk | Sierra |
| Resolution quality | 8 | 9 |
| Ease of use | 7.5 | 6 |
| Features | 9 | 8 |
| Value for money | 6.5 | 5.5 |
| Platforms | 9 | 9.5 |
Zendesk AI agents: what the AI does
- AI agents on messaging, email and voice
- 80 languages with automatic switching
- Plain-language multi-step procedures
- Automated QA and policy auditing
- Copilot for human agents (add-on)
- Native to one of the most widely used helpdesks
- Broad channel coverage including voice
- Strong language support
- Built-in QA and auditing
- Entry tier only includes the basic AI agent
- Small included resolution allowance; overage adds up
- Copilot and other add-ons stack on top of seat prices
Sierra: what the AI does
- Ghostwriter agent builder from SOPs and transcripts
- One agent across chat, voice, SMS, WhatsApp and email
- Experiments and multivariate testing
- Monitors and full observability
- Long-horizon planning and proactive outreach (Horizon)
- Widest channel coverage, including voice
- Strong testing and monitoring tools
- Proven at very large brands
- Extensive compliance certifications (SOC 2, HIPAA, FedRAMP)
- No public pricing; reviews describe enterprise-sized contracts
- Needs significant engineering and deployment effort
- Not built for small teams