HaystackOpen-source framework and enterprise platform for AI agents and RAG applications.
vs
Retell AIAI Voice Agents That Automate Phone Calls
Comparison · AI Agents · weekly run Nov 3
Haystack vs Retell AI
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Retell AI is the stronger AI pick in AI Agents: it has a visibility score of 2 versus 0 for Haystack.
Choose Haystack if…
- You need SOC 2 Type 2 (vendor claim, not an independent report) coverage
Choose Retell AI if…
- You want the brand AI engines rank higher (2 vs 0)
- You need HIPAA or SOC 2 Type II or GDPR or ISO 27001 coverage
- Highly rated by developers and SMBs
- One of the highest customer star ratings
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Haystack | Retell AI |
|---|---|---|
| Visibility score | 0% | 2% |
| Change vs last week | New | New |
| Rank in AI Agents | #76 | #42 |
| Share of voice | 0% | 0.5% |
| Mentions this run | 0 | 3 |
| 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 · Retell AI 0pp over 0 weekly runs.
Engine by engine
Retell AI leads on 3 of 3 engines
ChatGPT
AI Mode
Perplexity
HaystackRetell AI
Head to head in AI answers
0 engine answers name both brands
0Haystack ranked higher
0Retell AI ranked higher
Features, pricing & fit
| Dimension | Haystack | Retell AI |
|---|---|---|
| Pricing model | — | Usage-based |
| Entry price | — | Contact sales |
| Free plan | — | Yes |
| Deployment | Managed cloud, self-hosted, and sovereign or air-gapped environments, including STACKIT for sovereign European cloud | Cloud platform, with enterprise on-premises deployment available |
| Compliance | SOC 2 Type 2 (vendor claim, not an independent report) | HIPAA, SOC 2 Type II, GDPR, ISO 27001 |
| Support | — | Community and email support, 24/7 omnichannel support with dedicated portal (Enterprise), Dedicated implementation support (Enterprise), Named account manager (Enterprise) |
| Founded | 2018 | 2023 |
| Headquarters | Berlin, Germany | Redwood City, California |
| Employees | 51–200 | 51–200 |
| Funding | Round led by Balderton Capital, with GV, Harpoon, System.One and Lunar participating · $46M raised | Seed · $5M raised |
| Best for | Teams building AI agents and RAG applications with Python | Businesses that run high call volumes in healthcare, insurance, financial services, logistics and similar fields, and teams that want to build and change voice agents themselves. |
Plans side by side
Haystack
Pricing not available.
Retell AI
Pay as you go$0per minute, $0.07-$0.31 for voice agents
EnterpriseCustomcustom pricing
Pros and cons
Themes from the AI answers that mention each brand
Haystack
Profile in progress.
Retell AI
- Highly rated by developers and SMBs
- One of the highest customer star ratings
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Haystack vs Retell AI”, https://slateindex.ai/compare/haystack-vs-retell-ai, data of Nov 3, 2026. Licence: CC BY 4.0.