Provides a massive hosted model catalog with instant access, but requires trusting a third-party platform instead of self-hosting.
#1LiteLLM records 576,967 monthly visits with +7.9% month-over-month growth and Freemium, Contact for Pricing pricing. Sendmux records 37 monthly visits with -98.3% growth and Free pricing.

Give every AI agent a real inbox and one API to use it
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | litellm.ai | sendmux.ai |
| Pricing Model | Freemium, Contact for Pricing | Free |
| Monthly Visits | 576.97K (576,967) | 37 (37) |
| MoM Traffic Delta |
| +42.48K (+7.9%) |
| -2.2K (-98.3%) |
| Primary Market & Share | 🇺🇸 United States (27.9%) | 🇺🇸 United States (100%) |
|---|
| Direct Visits / mo | 228.97K | 12 |
|---|
| User Rating | 4.8 | 4.2 |
|---|
| Supported Platforms | Website | Website |
|---|

One open-source AI gateway for 100+ LLM providers
Call 100+ providers and 1,800+ models using one request format, so you can swap models without changing application code.
Issue scoped keys per team, project or app, set monthly spend caps and see exactly who is driving usage and cost.
Distribute traffic across deployments, retry on failure and automatically fall back to another model or provider when one goes down.
Dashboards for request volume, tokens and cost per model, with support for logging and analytics integrations.

Give every AI agent a real inbox and one API to use it
Provision mailboxes on verified domains or a shared myagent.mx address, with clean JSON output that strips signatures and quotes.
Send over HTTP or SMTP using the same mailbox credential as a Bearer token and SMTP password, with Idempotency-Key retries and attachment support.
Bind keys to providers, delivery groups, weights, and quota windows so traffic stays inside the boundaries you set.
Signed webhooks for delivery and receipt events, an SSE stream for live mailbox clients, and typed change polling for resync.
Provides a massive hosted model catalog with instant access, but requires trusting a third-party platform instead of self-hosting.
#1
SpecialistHosts high-performance open-weight models directly on dedicated serverless infrastructure, but does not route across external providers.
#2Delivers automated model failover and budget governance through an API gateway, but with less open-source customization.

Collaborative inbox and email management for teams

Unified LLM gateway with failover and analytics, but offers less robust open-source developer SDK support.

Email an AI assistant and let it run your schedules, inbox and CRM

The universal context engine connecting agents to data, tools, and models

Managed auth and 10,000+ tools for the agents you're building
Fast Apply and agent-tuned inference for coding agents
AI gateway, observability and guardrails for production LLM apps

Provides managed multi-provider AI routing and cost tracking, but lacks the native open-source flexibility of LiteLLM.
Free / Open-sourceAn open-source alternative for unifying LLM providers, but features a less extensive ecosystem of middleware integrations.
Provides a massive hosted model catalog with instant access, but requires trusting a third-party platform instead of self-hosting.
SpecialistHosts high-performance open-weight models directly on dedicated serverless infrastructure, but does not route across external providers.
Delivers automated model failover and budget governance through an API gateway, but with less open-source customization.
Collaborative inbox and email management for teams
Unified LLM gateway with failover and analytics, but offers less robust open-source developer SDK support.
Fast Apply and agent-tuned inference for coding agents
Free / Open-sourceAn open-source alternative for unifying LLM providers, but features a less extensive ecosystem of middleware integrations.