Sendmux records 37 monthly visits with -98.3% month-over-month growth and Free pricing. Spark Mail records 435,229 monthly visits with -13.5% growth and Freemium, Free Trial pricing.
Give every AI agent a real inbox and one API to use it
Smart, focused email with AI help — for individuals and teams
| Dimension / Metric | | |
|---|---|---|
| Official Domain | sendmux.ai | sparkmailapp.com |
| Pricing Model | Free | Freemium, Free Trial |
| Monthly Visits | 37 (37) | 435.23K (435,229) |
| MoM Traffic Delta | -2.2K (-98.3%) | -67.76K (-13.5%) |
| Primary Market & Share | 🇺🇸 United States (100%) | 🇺🇸 United States (31.3%) |
| Direct Visits / mo | 12 | 198.43K |
| User Rating | 4.2 | 4.3 |
| Supported Platforms | Website | Website |
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.
Smart, focused email with AI help — for individuals and teams
Spark's Smart Inbox and Priority highlight messages from important people and bundle newsletters and notifications so the rest of your inbox stays quiet.
An AI Assistant lets you find, summarize, and take action on anything in your inbox, while an AI writing assistant drafts emails and Auto-Drafts pre-writes replies.
Translate incoming messages, get instant summaries of long threads, and quickly grasp the point without reading every line.
Share drafts, leave private comments, delegate ownership, and track progress on email threads with your colleagues.
Blazing-fast keyboard-driven email experience with powerful AI features, but operates on a much higher subscription price point.
Blazing-fast keyboard-driven email experience with powerful AI features, but operates on a much higher subscription price point.
Significantly stronger team collaboration features with shared inboxes and internal chat, but less focus on standalone consumer AI drafting.
Significantly stronger team collaboration features with shared inboxes and internal chat, but less focus on standalone consumer AI drafting.
Email an AI assistant and let it run your schedules, inbox and CRM
Provides cross-platform support with integrated AI drafting, but lacks some of Spark's advanced shared team workspace features.
Provides cross-platform support with integrated AI drafting, but lacks some of Spark's advanced shared team workspace features.
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
Fast Apply and agent-tuned inference for coding agents
AI gateway, observability and guardrails for production LLM apps
Offers deeper AI-driven inbox organization and automated bundles, but has a different interface and navigation structure than Spark.
Offers deeper AI-driven inbox organization and automated bundles, but has a different interface and navigation structure than Spark.
SpecialistOne AI assistant that works wherever you work
SpecialistOne AI assistant that works wherever you work
One API key for 70+ AI models, 1,000+ data APIs and web tools
