Overview of Respan Gateway
Respan Gateway is an AI infrastructure platform that connects your application to over 1,000 AI models through a single endpoint. Beyond basic routing, it provides production-grade reliability and control features such as fallbacks, retries, caching, spend limits, alerts, and full traces for every call. The platform also includes observability, evals, prompt management, monitors, and cost controls—all in one place—so teams don’t need to stitch together multiple tools to debug production. Respan Gateway is open source and can be self-hosted, making it a strong choice for organizations that need deep control over their AI stack.
Why Look for Alternatives
While Respan Gateway offers a comprehensive feature set, it may not be the perfect fit for every team. Some organizations might prioritize different capabilities:
- Agent orchestration and delivery: Teams that want ready-made agents accessible through chat apps rather than building on infrastructure.
- Embeddable chat UI and billing: Developers who need a quick way to embed a customer-facing agent with built-in usage billing.
- Runtime security and governance: Organizations focused on preventing prompt injection and data exfiltration at the tool boundary.
Additionally, some teams may find Respan Gateway’s breadth overwhelming or may prefer a more specialized tool that aligns with their primary use case. Budget, technical expertise, and existing workflows also play a role in choosing an alternative.
Top Alternatives
1. AgentSky
Score: 38/100
AgentSky provides fully managed, long-horizon agents (such as Claude Code, Codex, Hermes, and OpenClaw) out of the box. It allows you to interact with agents through popular chat apps like WhatsApp, iMessage, Telegram, Slack, and Discord without additional integration work. With 700+ plugins for common SaaS tools (GitHub, Gmail, Notion, Jira, etc.), AgentSky reduces setup for agent workflows. It also offers a Mac app that can run agents locally and seamlessly move to the cloud, plus team collaboration features so multiple people can follow and interact with agent sessions.
Pros:
- Fully managed agents with long-horizon capabilities
- Access via chat apps without extra integration
- 700+ plugins for SaaS tools
- Mac app for local/cloud hybrid use
- Team collaboration features
Cons:
- Focuses on agent orchestration, not model routing, fallbacks, caching, or spend controls
- Lacks deep observability, evals, prompt management, and cost governance
- Limited to 130 models from 46 makers (vs. Respan’s 1,000+)
- No self-hosted or open-source option
- Lacks PII redaction, per-customer spend limits, and load balancing
Use cases: Choose AgentSky if you want to quickly deploy and interact with ready-made AI agents through chat apps and plugins, rather than building and operating your own model gateway. It suits teams that prioritize agent accessibility and collaboration over low-level routing, observability, and cost control.
2. 21st Agents SDK
Score: 35/100
21st Agents SDK offers a complete, embeddable chat UI and session management out of the box, reducing frontend work. It provides TypeScript-first agent definition with one-command deployment, simplifying the developer experience. Built-in usage billing and observability are tailored for customer-facing agents. Backed by Y Combinator, it indicates active development and support.
Pros:
- Embeddable chat UI and session management
- TypeScript-first agent definition with one-command deployment
- Built-in usage billing and observability for customer-facing agents
- Backed by Y Combinator
Cons:
- No multi-model routing, fallbacks, or load balancing across 1,000+ models
- Lacks advanced gateway features like PII redaction, per-customer spend limits, and caching
- No self-hosted or open-source option; deployment tied to their platform
- Limited to agent-specific use cases, not a general AI infrastructure layer
Use cases: Choose 21st Agents SDK if you need to quickly build and embed a customer-facing AI agent with a ready-made chat UI and built-in billing, rather than managing multi-model routing and production reliability across many providers.
3. Aethra AI
Score: 35/100
Aethra AI focuses on runtime security and governance for AI agents, blocking prompt injection and data exfiltration at the tool boundary. It uses provenance-based enforcement (trusted vs. untrusted data labels) rather than pattern matching, reducing false positives. The open-source SDK (Apache 2.0) with offline enforcement works without relying on a hosted service. An optional control plane provides human approvals, audit evidence, and a kill-switch for agent actions. It is strong on security-specific use cases like preventing sensitive data leaks and unauthorized actions.
Pros:
- Runtime security and governance for AI agents
- Provenance-based enforcement reduces false positives
- Open-source SDK (Apache 2.0) with offline enforcement
- Optional control plane with human approvals, audit evidence, and kill-switch
- Strong for preventing sensitive data leaks and unauthorized actions
Cons:
- No model routing, fallbacks, caching, or spend limits across 1,000+ AI models
- Lacks observability features like full traces, evals, prompt management, and cost controls
- Not a gateway; cannot serve as a single API endpoint for multiple model providers
- Early-stage pre-seed product with limited track record
- Requires integration at the agent/tool level rather than being a drop-in replacement for an AI gateway
Use cases: Choose Aethra AI when your primary concern is securing AI agents against prompt injection and data exfiltration, especially if you need provenance-based enforcement and human approval workflows. It complements rather than replaces Respan Gateway if you also need model routing, observability, and cost management.
How to Choose
Selecting the right alternative depends on your team’s priorities:
- If you need ready-made agents and chat app integration: AgentSky is a strong choice for quickly deploying and interacting with agents through popular messaging platforms, with extensive plugins and team collaboration.
- If you’re building a customer-facing agent with embedded chat and billing: 21st Agents SDK simplifies frontend work and provides built-in usage billing, ideal for agent-specific use cases.
- If security and governance are paramount: Aethra AI offers runtime protection against prompt injection and data exfiltration, with provenance-based enforcement and human approval workflows.
Consider whether you need a full AI gateway with routing, observability, and cost controls (Respan Gateway’s strength) or a specialized tool that addresses a specific pain point. Evaluate factors like self-hosting requirements, model catalog size, and integration effort. For teams that need both security and gateway capabilities, Aethra AI can complement Respan Gateway rather than replace it.
