Relay vs ZER0 - Unblock Your Agents: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Relay and ZER0 - Unblock Your Agents — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
R
Relay
Relay
AI phone receptionist that builds itself from a business's website to answer every call and book, reschedule, or cancel appointments 24/7.
Key features
- One-Click Build: Paste a website and Relay drafts the agent profile, knowledge base, prompt, and call wiring in about 38 seconds.
- 24/7 Call Answering: Picks up every call day or night in the caller's local time, with no voicemail or hold music.
- Real Calendar Booking: Checks live availability and writes appointments, reschedules, and cancellations directly to the business's existing booking system.
- Booking Integrations: Connects to 7+ systems including Google Calendar, Square, Calendly, Outlook, Housecall Pro, Workiz, and Vagaro with one sign-in.
- Grounded Answers: Answers caller questions from the business's own facts and knowledge base rather than guessing.
- No-Config Setup: Requires no dashboards, prompt engineering, or manual call-flow building.
Best for
- Missed-Call Recovery: Capture bookings from calls that would otherwise ring out when staff are busy or closed.
- Appointment-Based Businesses: Let salons, clinics, and home-service providers automate booking, rescheduling, and cancellations by phone.
- After-Hours Coverage: Answer and book calls 24/7 without hiring overnight reception staff.
- Fast Agent Deployment: Stand up a working phone agent from a website link without engineering time.
- FAQ Handling: Answer common caller questions about hours, services, and pricing from the business's own information.
ZER0 - Unblock Your Agents
Zero
Platform to discover, connect, and use agent services across the internet, unblocking AI workflows and integrations.
Key features
- Service Discovery: A centralized registry and discovery mechanism to find agent services and capabilities across the internet, reducing manual service discovery overhead.
- Unified Connector Layer: Connects disparate agent endpoints through standardized APIs or adapters so applications can invoke remote agents with a consistent interface.
- Secure Access & Authorization: Provides authentication and permissioning controls to gate which agents or clients can call specific services and to record access events for auditing.
- Orchestration & Routing: Routes requests between callers and agent services, enabling composition of multi-step or multi-agent workflows with controlled execution paths.
- Developer Tooling: SDKs, API endpoints, or integration helpers (platform-agnostic) to simplify embedding discovered agent services into applications and prototypes.
- Monitoring & Telemetry: Collection of usage and operational metadata to help track agent performance, errors, and invocation metrics for debugging and optimization.
- Interoperability: Adapters and connectors designed to bridge different agent implementations or hosting environments so capabilities can be reused across platforms.
- Governance Controls: Policy and governance primitives to define allowed behaviors, blocklists, or rate limits for connected agent services.