Comparison
Voice agent platforms, runtimes and model routers
A sourced comparison of Vapi, Retell AI, Bland AI, Pipecat and Speko across telephony, provider choice, runtime ownership, operations, pricing and tradeoffs.
A hosted voice agent platform, an agent runtime and a voice model router are not interchangeable. The platform manages more of the deployed agent. The runtime owns the realtime conversation loop. The model router selects or pins model APIs. Compare products only after choosing which boundary the team intends to own.
- Short answer
- Vapi, Retell AI and Bland AI are hosted products. Pipecat is a runtime framework. Speko Router is a hosted data plane and Gateway is a customer-side runtime.
- Author
- Speko engineering
- Reviewed by
- Speko engineering
- Published
- Last reviewed
Comparison matrix
Competitor category and billing statements were checked against official sources on ; Pipecat was checked on . The matrix compares product boundaries, not overall quality. Follow the source before making a purchasing decision.
| Option | Scope | Telephony | Provider choice and routing |
|---|---|---|---|
| Speko Router + GatewayVoice model router | ScopeCompatible model calls for STT, LLM and TTS. It does not run the conversation loop. | TelephonyNot included in the Router or Gateway boundary. Telephony and WebRTC remain with the application runtime. | Provider choice and routingThe application can pin a model or request measured automatic selection from eligible routes. |
| VapiHosted developer platform for voice agents | ScopeManaged agent orchestration with prompts, tools and a provider stack configured in the platform. | TelephonyTelephony is connected and billed separately from Vapi hosting and orchestration. | Provider choice and routingDevelopers configure supported STT, LLM and TTS choices. Model usage can be pass-through or BYOK. |
| Retell AIHosted phone-agent platform | ScopeManaged phone agents assembled from Retell-supported infrastructure and model components. | TelephonyPublished options include Retell carrier service and custom SIP, priced as separate components. | Provider choice and routingThe agent uses model and infrastructure choices supported by the Retell configuration surface. |
| Bland AIHosted phone automation platform | ScopeManaged phone-call automation, including campaign and call execution inside the Bland product. | TelephonyBland supports its own telephony and BYOT. Carrier, transfer and some outbound charges can be separate from connected-minute usage. | Provider choice and routingSTT, LLM and TTS are integrated into the connected-minute product rather than exposed as a neutral router. |
| PipecatOpen-source framework with an optional managed cloud | ScopePipecat is a code framework for realtime pipelines; Pipecat Cloud is a separate managed deployment service. | TelephonyA self-hosted application selects its transport or telephony integration. Pipecat Cloud offers managed deployment around Pipecat workloads. | Provider choice and routingDevelopers wire individual STT, LLM and TTS services in code, or point those services at an external router. |
| Option | Runtime ownership | Observability and failover | Pricing model |
|---|---|---|---|
| Speko Router + GatewayVoice model router | Runtime ownershipSpeko operates the routing API; the customer keeps LiveKit, Pipecat or a custom runtime. | Observability and failoverRoute, reason, failover-count and first-byte headers. Failover is pre-response only, not mid-stream. | Pricing modelRouter markup or an infrastructure rate; current terms are kept on the pricing page. |
| VapiHosted developer platform for voice agents | Runtime ownershipVapi operates the hosted platform; the customer configures the agent and connected services. | Observability and failoverThe platform owns call logs and orchestration. Fallback behavior stays within the configured provider paths. | Pricing modelUsage-based hosting and orchestration, plus model and telephony charges; BYOK providers can bill directly. |
| Retell AIHosted phone-agent platform | Runtime ownershipRetell operates the phone-agent platform and runtime; the customer configures the agent. | Observability and failoverCall operations and logs are platform-managed within the supported component boundary. | Pricing modelComponent pricing: voice infrastructure plus selected TTS, LLM, telephony and optional features. |
| Bland AIHosted phone automation platform | Runtime ownershipBland operates the phone automation stack; the customer configures workflows and integrations. | Observability and failoverCall execution and logs are platform-managed inside the phone automation boundary. | Pricing modelTiered monthly plans plus connected-minute usage. Carrier, BYOT, transfer and some outbound charges can add telephony cost. |
| PipecatOpen-source framework with an optional managed cloud | Runtime ownershipThe application team owns a self-hosted Pipecat runtime. Pipecat Cloud manages deployment infrastructure, scaling, operations and monitoring for hosted workloads. | Observability and failoverSelf-hosted teams own runtime operations; Pipecat Cloud provides a managed operational layer. Model-service behavior still depends on the configured services. | Pricing modelThe framework is open source. Self-hosted model, transport and hosting costs are separate; Pipecat Cloud is a separately priced managed service. |
Each option’s official sources and check date sit with its tradeoffs below.
What Speko Router and Gateway replace
Competitor-specific tradeoffs
Speko vs Vapi
Managed agent orchestration with prompts, tools and a provider stack configured in the platform.
- Developer-facing managed agent surface
- Configurable provider stack
- Platform owns more of deployment and call orchestration than a model router
- The bill spans platform, model and telephony components
- Provider compatibility and fallback coverage depend on the current platform configuration
- Moving to or from a hosted agent abstraction is a wider change than swapping a model API
Choose Vapi when a managed developer platform should own agent orchestration and provider configuration.
Speko vs Retell AI
Managed phone agents assembled from Retell-supported infrastructure and model components.
- Managed phone-agent product
- Component-based configuration and pricing surface
- Telephony and agent operations live in one hosted workflow
- The final rate depends on the selected model, telephony and optional components
- Provider choice is bounded by the platform-supported combinations
- A platform-managed runtime offers less code-level control than owning the loop
Choose Retell when the requirement is a managed phone-agent product rather than a standalone model-routing API.
Speko vs Bland AI
Managed phone-call automation, including campaign and call execution inside the Bland product.
- Phone-automation product boundary
- Managed campaign and call execution
- Integrated model components reduce the number of services the application wires directly
- The product boundary is phone automation, not a provider-neutral model API
- Monthly tier, connected-minute, carrier, BYOT and applicable transfer or outbound charges must be compared together
- Model-level control is bounded by the platform surface
Choose Bland when the managed phone automation workflow is the product requirement.
Speko vs Pipecat
Pipecat is a code framework for realtime pipelines; Pipecat Cloud is a separate managed deployment service.
- Code-level control of the realtime pipeline
- Open-source framework and service ecosystem
- Can use direct providers or an external model router
- Self-hosting leaves deployment, scaling and operational monitoring with the team
- Provider setup and cross-service policy live in application code
- Hosting and provider costs remain separate
Choose Pipecat for code-level control of the realtime conversation loop; choose Pipecat Cloud when its managed deployment boundary fits. Add Speko only if routed model services are useful inside that loop.
A practical evaluation order
- 01Decide who owns telephony and media transport.
- 02Decide whether the conversation loop lives in a hosted product or in your runtime.
- 03Decide whether model choice is fixed, application-managed or delegated to a router.
- 04Compare latency, quality, cost, failure behavior and observability on the same calls.
Choose the layer first. Compare products inside that boundary second.