Level AI vs Sierra: Complete Comparison (2026)
An in-depth comparison of Level AI and Sierra to help you choose the right tool for your business.
Last updated: November 2026
Level AI
6.8/10
Level AI is a contact center AI platform that offers automated quality assurance, real-time agent assist, virtual agents and voice-of-customer analytics for high-volume support teams.
Sierra
7.4/10
Sierra is an enterprise conversational AI platform that builds and runs customer service agents across chat, voice, SMS, WhatsApp and email.
Feature-by-Feature Comparison
| Feature | | |
|---|---|---|
| Scores | ||
| Overall Rating | 6.8/10 | 7.4/10 |
| Integration | 7/10 | 8/10 |
| Analytics | 9/10 | 8/10 |
| Customization | 7/10 | 9/10 |
| Ease of Use | 7/10 | 7/10 |
| Support | 7/10 | 8/10 |
| Cost | 3/10 | 2/10 |
| Scalability | 8/10 | 9/10 |
| Security | 9/10 | 9/10 |
| Output Quality | 7/10 | 9/10 |
| Pricing | ||
| Free plan | No | No |
| Cheapest paid plan | Contact for pricing | Contact for pricing |
| Estimated cost for 10 users | Contact for pricing | Contact for pricing |
| Features | ||
| AI Agents | ||
| Chatbots | ||
| Enterprise Controls | ||
| Text Generation | ||
| Data Analysis | Not listed | |
| Knowledge Base Search | Not listed | |
| Transcription | Not listed | |
| Voice and Audio | Not listed | |
| Workflow Automation | Not listed | |
Which One Should You Choose?
Why choose Level AI
- Higher Analytics score (9/10 vs 8/10)
- Higher Cost score (3/10 vs 2/10)
- Better fit for healthcare (7/10 vs 5/10)
- Better fit for mid-market (7/10 vs 5/10)
Why choose Sierra
- Higher Customization score (9/10 vs 7/10)
- Higher Output Quality score (9/10 vs 7/10)
Pros & Cons
Level AI
Pros
- Automated QA scores every interaction rather than the small manual sample supervisors usually review.
- Security credentials are broad: SOC 2 Type II, ISO 27001, PCI DSS, HITRUST, HIPAA BAA, SSO and SCIM.
- PII such as card numbers and SSNs is redacted before AI processing, and sub-processors cannot train on customer data.
- Native integrations with Genesys, Five9, NICE and Salesforce.
- Review ratings are strong, around 4.5 out of 5 across about 157 aggregated ratings.
Cons
- No public pricing, so every deal goes through sales.
- Some G2 reviewers say it struggles to score multiple topics accurately within one sentence.
- Narrowly focused on contact centers, so it is not useful as a general AI tool.
- The pending Five9 acquisition adds uncertainty about the roadmap and standalone availability.
Sierra
Pros
- Outcome-based billing means customers usually pay only for resolved conversations or other agreed results, not for each seat.
- Three build options cover both CX teams and engineers: the no-code Agent Studio, the code-first Agent SDK, and Ghostwriter for building agents from SOPs.
- One agent runs across chat, voice, SMS, WhatsApp, email and ChatGPT, keeping context between channels.
- Its list of compliance attestations is broad, covering SOC 2, ISO 27001, ISO 42001, HIPAA, PCI DSS and FedRAMP.
- It has a strong roster of enterprise customers, including SiriusXM, ADT, Rocket Mortgage and SoFi.
Cons
- There is no public pricing, and competitor estimates put annual contracts at about $150,000 or more.
- There is no self-serve or trial tier, so small teams cannot try it on their own.
- Implementation is largely vendor-led, which can make customers depend on Sierra's team for changes.
- There are few public reviews (7 on Gartner Peer Insights) to verify claims against.
- Some reviewers say voice quality still falls short of human level, and that complex telephony setups depend on how far the integration goes.
Not sold on either?
Frequently Asked Questions
Sierra scores higher on our AI Software criteria: 7.4/10 against 6.8/10 for Level AI. The largest gap is in Customization: 7/10 for Level AI and 9/10 for Sierra.
No, neither Level AI nor Sierra lists a free plan.
Level AI is the better fit for healthcare: we rate it 7/10 for them, against 5/10 for Sierra.
