GleanEnterprise AI that understands your company
vs
SierraHelps businesses build better, more human customer experiences with AI.
Comparison · AI Agents · weekly run Nov 3
Glean vs Sierra
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Sierra is the stronger AI pick in AI Agents: it has a visibility score of 1.5 versus 0.9 for Glean.
Choose Glean if…
- AI answers describe it more positively (56% vs 33% positive)
- You need ISO 42001 or HIPAA or TX-RAMP Level 2 or SOC 2 Type II or ISO 27001 or GDPR coverage
- Enterprise search across many connected apps
- Seen as a market leader in enterprise search
Choose Sierra if…
- You want the brand AI engines rank higher (1.5 vs 0.9)
- You prefer a larger, established vendor (1,001–5,000 employees)
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Glean | Sierra |
|---|---|---|
| Visibility score | 0.9% | 1.5% |
| Change vs last week | New | New |
| Rank in AI Agents | #63 | #49 |
| Share of voice | 0.4% | 0.5% |
| Mentions this run | 3 | 3 |
| Positive in AI answers | 56% | 33% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Glean 0pp · Sierra 0pp over 0 weekly runs.
Engine by engine
Sierra leads on 2 of 3 engines
ChatGPT
AI Mode
Perplexity
GleanSierra
Head to head in AI answers
0 engine answers name both brands
0Glean ranked higher
0Sierra ranked higher
Features, pricing & fit
| Dimension | Glean | Sierra |
|---|---|---|
| Deployment | Per-customer search model stored in the customer's VPC | Managed and forward-deployed, with no self-serve option. |
| Integrations | 250+ | — |
| Compliance | ISO 42001, HIPAA, TX-RAMP Level 2, SOC 2 Type II, ISO 27001, GDPR | — |
| Support | Help Center | — |
| Founded | 2019 | 2024 |
| Headquarters | San Francisco, CA | San Francisco, California, United States |
| Employees | 501–1,000 | 1,001–5,000 |
| Funding | Seed or early-stage round (emerged from stealth) · $765M raised | Series E, led by Tiger Global and GV |
| Best for | Large enterprises that want AI answers and agents grounded in their own permission-aware company data | Businesses that want customer service AI agents across chat and voice, built by customer experience teams with or without engineering support. |
Pros and cons
Themes from the AI answers that mention each brand
Glean
- Enterprise search across many connected apps
- Seen as a market leader in enterprise search
- Finds answers and internal experts quickly
- Recommended for enterprise-wide knowledge search
Sierra
Profile in progress.
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Glean vs Sierra”, https://slateindex.ai/compare/glean-vs-sierra, data of Nov 3, 2026. Licence: CC BY 4.0.