Respan Gateway vs Sun (2026)
A side-by-side comparison of Respan Gateway and Sun on pricing, features, and fit, so you can decide which is right for you.
Quick answer
Respan Gateway and Sun are both strong choices, but they fit different needs. Choose Respan Gateway if you mainly need managing multi-provider llm traffic for production ai applications — its edge is combines routing, observability, and evals in a single platform reducing tool sprawl. Choose Sun if you need building ai-powered voice bots for customer support — its edge is focused collaborative tooling makes team development faster. Respan Gateway starts at around $49/month based on usage volume; Sun starts at Pricing details not publicly listed; contact for paid tiers.
Features compared
- Unified LLM routing across multiple AI providers with a single API endpoint
- Built-in observability including request tracing, latency monitoring, and logging
- Automated evaluations to benchmark and compare model outputs at scale
- Fallback and retry logic to handle provider outages and reduce downtime
- Real-time voice API for AI agent communication
- Collaborative workspace for team-based agent design
- Multi-agent voice orchestration and routing
- Developer-friendly SDKs and integration documentation
Pros & cons
- Combines routing, observability, and evals in a single platform reducing tool sprawl
- Provider-agnostic design makes it easy to swap or mix LLM providers
- Saves engineering time by replacing custom middleware with ready-built infrastructure
- Relatively new platform so documentation and community resources are still maturing
- Advanced evaluation customization may require technical setup not suited for non-developers
- Focused collaborative tooling makes team development faster
- Real-time voice capabilities reduce latency in agent responses
- Developer-first design simplifies API integration and onboarding
- Pricing details are not transparently listed on the website
- Limited public documentation and community resources compared to established voice API providers
The verdict
Choose Respan Gateway if
you mainly need to managing multi-provider llm traffic for production ai applications. Its edge: combines routing, observability, and evals in a single platform reducing tool sprawl.
Choose Sun if
you mainly need to building ai-powered voice bots for customer support. Its edge: focused collaborative tooling makes team development faster.
Frequently asked questions
Is Respan Gateway better than Sun?
Neither is universally better. Respan Gateway is stronger for managing multi-provider llm traffic for production ai applications, with an edge in combines routing, observability, and evals in a single platform reducing tool sprawl. Sun is stronger for building ai-powered voice bots for customer support, with an edge in focused collaborative tooling makes team development faster. Pick based on your main task.
Which is cheaper, Respan Gateway or Sun?
Respan Gateway starts at around $49/month based on usage volume and Sun starts at Pricing details not publicly listed; contact for paid tiers. Free tier: Respan Gateway — Free tier available with limited requests and basic observability features; Sun — Limited API calls and basic features available on a free plan.
What is Respan Gateway best for?
Respan Gateway is best for managing multi-provider llm traffic for production ai applications, running automated evals to compare model quality across openai and anthropic, monitoring api costs and latency to optimize ai infrastructure spending.
What is Sun best for?
Sun is best for building ai-powered voice bots for customer support, creating multi-agent systems that communicate via voice, prototyping and deploying voice-enabled automation workflows.
Do Respan Gateway and Sun have free plans?
Respan Gateway: Free tier available with limited requests and basic observability features. Sun: Limited API calls and basic features available on a free plan. Check each tool's pricing page for current limits, as plans change.