HaystackOpen-source framework and enterprise platform for AI agents and RAG applications.
vs
SimThe open-source AI workspace to build, distribute, and govern AI agents
Comparison · AI Agents · weekly run Nov 3
Haystack vs Sim
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Sim is the stronger AI pick in AI Agents: it has a visibility score of 2.3 versus 0 for Haystack.
Choose Haystack if…
- You need SOC 2 Type 2 (vendor claim, not an independent report) coverage
- You prefer a larger, established vendor (51–200 employees)
Choose Sim if…
- You want the brand AI engines rank higher (2.3 vs 0)
- You need SOC 2 Type II or ISO 27001 or GDPR coverage
- Technical control and model flexibility
- Self-hosting option
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Haystack | Sim |
|---|---|---|
| Visibility score | 0% | 2.3% |
| Change vs last week | New | New |
| Rank in AI Agents | #76 | #39 |
| Share of voice | 0% | 0.7% |
| Mentions this run | 0 | 5 |
| Positive in AI answers | — | — |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Haystack 0pp · Sim 0pp over 0 weekly runs.
Engine by engine
Sim leads on 3 of 3 engines
ChatGPT
AI Mode
Perplexity
HaystackSim
Head to head in AI answers
0 engine answers name both brands
0Haystack ranked higher
0Sim ranked higher
Features, pricing & fit
| Dimension | Haystack | Sim |
|---|---|---|
| Pricing model | — | Per seat |
| Entry price | — | Free; paid from $25 per seat / mo |
| Free plan | — | Yes |
| Deployment | Managed cloud, self-hosted, and sovereign or air-gapped environments, including STACKIT for sovereign European cloud | Cloud-hosted, or self-hosted in your own cloud with Docker or Kubernetes |
| Integrations | — | 275+ |
| Compliance | SOC 2 Type 2 (vendor claim, not an independent report) | SOC 2 Type II, ISO 27001, GDPR |
| Support | — | Dedicated support on the Enterprise plan |
| Founded | 2018 | 2025 |
| Headquarters | Berlin, Germany | San Francisco, CA, United States |
| Employees | 51–200 | 11–50 |
| Funding | Round led by Balderton Capital, with GV, Harpoon, System.One and Lunar participating · $46M raised | Series A · $7M raised |
| Best for | Teams building AI agents and RAG applications with Python | Companies that need to build, deploy, and govern AI agents across the organization with central control over access, spend, and data |
Plans side by side
Haystack
Pricing not available.
Sim
Free$0free forever
Pro$25per user/month, billed monthly
Max$100per user/month, billed monthly
EnterpriseCustomcustom, talk to sales
Pros and cons
Themes from the AI answers that mention each brand
Haystack
Profile in progress.
Sim
- Technical control and model flexibility
- Self-hosting option
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Haystack vs Sim”, https://slateindex.ai/compare/haystack-vs-sim, data of Nov 3, 2026. Licence: CC BY 4.0.