LlamaIndex vs StackAI

Comprehensive side-by-side comparison — features, pricing, performance, and more.

Data last refreshed October 2026

LlamaIndex

LlamaIndex Inc.

AI Agents for Document OCR + Workflows

Freemium

82% verification coverage

StackAI

Stack AI (Eigen Inc.)

AI Agents for the Enterprise

Freemium

75% verification coverage

Trust & Reliability

LlamaIndex

Uptime:99.99%Status page

Users:100K-1M

Customers (per vendor):Jeppesen (a Boeing Company), NTT Data, Carlyle

GDPR

SOC 2

HIPAA

StackAI

Uptime:100.0%Status page

Customers (per vendor):BAE Systems, Mayo Clinic, MIT +7

GDPR

SOC 2

HIPAA

Too Close to Call

LlamaIndex (6.8) vs StackAI (6.7) — difference of 0.2 points

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

AI Comparison Summary

LlamaIndex

6.8

avg score

StackAI

6.7

avg score

Both tools score very similarly overall — the best choice depends on your specific priorities.

Based on 6 dimensions

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Too close to call — it's a tie

LlamaIndex

Best For

Engineering and R&D teams accelerating product development

Administrative operations streamlining business processes

Financial analysts building AI-powered financial models

Insurance companies automating claims and underwriting

StackAI

Best For

IT teams orchestrating AI across the enterprise

Organizations with regulated and complex operations

Legal teams redlining contracts and accelerating due diligence

Risk and compliance teams strengthening defense with AI

* Verdict is based on our algorithmic scoring of publicly available data. Learn about our methodology

LlamaIndex is best for

✍️Writing & Content7.0🤖Automation & Agents6.2🔍Research5.8

StackAI is best for

💬Chat & Conversation7.3💻Coding & Dev7.0🤖Automation & Agents7.0

Filter by your use case:

Limitations

LlamaIndex

Cons

LlamaParse is a commercial platform and not open source, though LlamaIndex and Workflows are open source projects.
Bonus credits on the Pro plan expire immediately upon downgrade and require a business email domain.

StackAI

Cons

No cons listed yet.

Weighted Score — Adjust What Matters to You

Pick a profile or drag sliders — scores and radar update instantly on the right.

Quick profiles:

Ease of Use5

Customization5

Support5

Integration5

Compliance & Data Protection5

Performance5

Planning Quality5

Dimension Comparison

LlamaIndex

6.8

/ 10

Your pick

StackAI

6.7

/ 10

Dimension Breakdown

Ease of Use

How intuitive is onboarding, UI navigation, and day-to-day usage for the target audience?

LlamaIndex

3.0

StackAI

3.0

Customization

Calculated

How much can users tailor workflows, settings, prompts, or outputs to their needs?

LlamaIndex

10.0▲ +2.0

StackAI

8.0

Support

How strong is the documentation, customer support, community, and learning resources?

LlamaIndex

10.0▲ +1.0

StackAI

9.0

Integration

Calculated

How well does it connect with other tools, APIs, and workflows?

LlamaIndex

5.0

StackAI

9.0▲ +4.0

Compliance & Data Protection

Calculated

Compliance certifications and data-protection posture, counted from ten verified signals: SOC 2 Type II, GDPR compliance, HIPAA, WCAG AA/AAA, PII redaction, licensed-only training, a published sub-processor list, a downloadable DPA, not training on user data, and a documented deletion path

LlamaIndex

8.0▲ +2.0

StackAI

6.0

Performance

Calculated

Latency + throughput speed

LlamaIndex

5.0

StackAI

5.0

Planning Quality

Calculated

Multi-step planning depth + replanning capability

LlamaIndex

—

StackAI

—

Calculated = derived from structured signals (integration count, API/open-source config, compliance certs, response-time). AI = LLM-assessed from public website content. Methodology

Task Performance

LlamaIndex

Task

StackAI

6.0

Role Definition

7.0

6.0

Task Decomposition

6.0

Agent Coordination

6.0

5.0

Inter Agent Communication

5.0

8.0

Workflow Orchestration

9.0

7.0

Tool Use Delegation

7.0

State Management

6.0

Error Recovery

6.0

7.0

Observability

8.0

7.0

Scalability Throughput

7.0

8.0

Workflow Building

9.0

4.0

Trigger Variety

8.0

* Task scores (1–10) are algorithmically generated from publicly available data.

Data is sourced from public information and vendor websites. It may not always be up-to-date — verify pricing and features directly with the vendor before purchasing.Report inaccuracy

Frequently Asked Questions

What are the main differences between LlamaIndex and StackAI?

LlamaIndex — "AI Agents for Document OCR + Workflows". StackAI — "AI Agents for the Enterprise". The Features section on this page compares them side by side.

Who is LlamaIndex best for compared with StackAI?

LlamaIndex is best for Engineering and R&D teams accelerating product development; and for Administrative operations streamlining business processes. StackAI is best for IT teams orchestrating AI across the enterprise; and for Organizations with regulated and complex operations.

How does the pricing of LlamaIndex compare with StackAI?

LlamaIndex is freemium, includes a free plan, paid plans start at $50/month. StackAI is freemium, includes a free plan. Always verify current pricing with the vendor.

Does LlamaIndex or StackAI have a free plan?

LlamaIndex has a free plan. StackAI has a free plan. Always verify current pricing with the vendor.

Do LlamaIndex and StackAI offer an API?

LlamaIndex offers a public API. StackAI offers a public API.

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