Retell AIAI Voice Agents That Automate Phone Calls
vs
Stack AIAI Agents for the Enterprise
Comparison · AI Agents · weekly run Nov 3
Retell AI vs Stack 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 1.4 for Stack AI.
Choose Retell AI if…
- You want the brand AI engines rank higher (2 vs 1.4)
- You need a self-hosted or on-premises option
- Highly rated by developers and SMBs
- One of the highest customer star ratings
Choose Stack AI if…
- hosted no-code agent builders
- free tiers for experimenting
- solid G2 and Slashdot ratings
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Retell AI | Stack AI |
|---|---|---|
| Visibility score | 2% | 1.4% |
| Change vs last week | New | New |
| Rank in AI Agents | #42 | #51 |
| Share of voice | 0.5% | 0.4% |
| Mentions this run | 3 | 3 |
| Positive in AI answers | — | 0% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Retell AI 0pp · Stack AI 0pp over 0 weekly runs.
Engine by engine
Retell AI leads on 2 of 3 engines
ChatGPT
AI Mode
Perplexity
Retell AIStack AI
Head to head in AI answers
0 engine answers name both brands
0Retell AI ranked higher
0Stack AI ranked higher
Features, pricing & fit
| Dimension | Retell AI | Stack AI |
|---|---|---|
| Pricing model | Usage-based | Usage-based |
| Entry price | Contact sales | Contact sales |
| Free plan | Yes | Yes |
| Deployment | Cloud platform, with enterprise on-premises deployment available | Multi-tenant cloud, VPC, or on-premise |
| Integrations | — | 500+ |
| Compliance | HIPAA, SOC 2 Type II, GDPR, ISO 27001 | HIPAA, GDPR, SOC 2 Type II, ISO 27001 |
| Support | Community and email support, 24/7 omnichannel support with dedicated portal (Enterprise), Dedicated implementation support (Enterprise), Named account manager (Enterprise) | Community support on Discord, Email support, Priority support, Dedicated support |
| Founded | 2023 | 2023 |
| Headquarters | Redwood City, California | San Francisco, CA, United States |
| Employees | 51–200 | 51–200 |
| Funding | Seed · $5M raised | Series A · $19M raised |
| Best for | 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. | IT teams and enterprise architecture teams that need to orchestrate, deploy, govern, and scale AI across the enterprise, including finance, risk and operations teams. |
Plans side by side
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
Retell AI
- Highly rated by developers and SMBs
- One of the highest customer star ratings
Stack AI
- hosted no-code agent builders
- free tiers for experimenting
- solid G2 and Slashdot ratings
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Retell AI vs Stack AI”, https://slateindex.ai/compare/retell-ai-vs-stack-ai, data of Nov 3, 2026. Licence: CC BY 4.0.