# AutoSend vs Sendmux AutoSend records 12,928 monthly visits with -50.1% month-over-month growth and Paid, Contact for Pricing pricing. Sendmux records 37 monthly visits with -98.3% growth and Free pricing. | Metric | [AutoSend](https://openaitools.app/tool/autosend) | [Sendmux](https://openaitools.app/tool/sendmux) | | :--- | :--- | :--- | | Website URL | https://autosend.com | https://sendmux.ai | | Categories | AI Email Marketing, AI Email Generator, AI API, AI Marketing | AI Developer Tools, AI Workflow, AI Email Assistant | | Pricing Model | Paid, Contact for Pricing | Free | | Monthly Visits | 12,928 | 37 | | MoM Growth Rate | -50.1% | -98.3% | | Primary Market | India | United States | | Direct Visits | 6,528 | 12 | | Review Score | 4.2 | 4.2 | | Saved Count | 0 | 0 | | Supported Platforms | Website | Website | ## AutoSend AutoSend gathers the three email jobs most teams end up splitting across separate tools, transactional sending, marketing campaigns, and automation, into one platform. Developers can send through a clean REST API or SMTP with official SDKs for Node.js, Next.js and other stacks, and the platform now supports an inbound email API that turns a received message into structured JSON with bodies, attachments, headers, and authentication checks parsed for you. Webhooks push real-time events for every delivery, open, bounce, or failure, so delivery health feeds straight into your own systems. On the marketing side, AutoSend provides campaigns for newsletters and product launches, a markdown-friendly email builder so non-developers can ship without blocking engineers, dynamic segmentation based on behavior and engagement signals, domain warmup to build sender reputation gradually, and smart triggers plus analytics for welcome, onboarding, and re-engagement flows. A distinguishing detail is multi-project support: separate projects can have their own contacts, domains, and API keys while still rolling up to a single bill. The pricing philosophy is a deliberate contrast with contact-based pricing, since AutoSend bills by send volume rather than how many contacts you store, which suits products with large user bases and small per-user email needs. The platform leans into agentic workflows, offering an MCP integration and a skill.md file aimed at assistants like ChatGPT, Claude, Codex, and Cursor, alongside a public status page and published delivery statistics. **Pricing & Plans:** AutoSend prices by email volume rather than contacts, with a free entry point for getting started, paid plans that scale with send volume, and enterprise arrangements via a demo; a $50-tier plan is referenced by a customer as supporting very large user counts. - **REST API, SMTP, and SDKs:** Send transactional email programmatically through a clean REST API or SMTP, with drop-in libraries for Node.js, Next.js, and other languages. - **Inbound email API:** Receive emails and get structured JSON with bodies, attachments, and headers parsed automatically, plus authentication checks. - **Campaigns and visual builder:** Create, personalize, and send newsletters and product launches with a markdown-based email builder, dynamic segmentation, and domain warmup. - **Automation and triggers:** Build welcome sequences, onboarding flows, and re-engagement campaigns that fire on user actions, contact property changes, or custom product events. - **Agent and MCP integrations:** An MCP server and skill file let AI agents and coding assistants create templates, manage contacts, send mail, and monitor delivery stats. **Strengths:** One platform covers transactional, marketing, and automation without splitting vendors; Volume-based pricing avoids penalizing products with large contact lists; Strong developer surface with REST API, SMTP, SDKs, webhooks, and an MCP server; Multi-project support with isolated contacts, domains, and keys on a single bill **Limitations:** Less brand recognition than legacy email giants, so social proof may be thinner for some buyers; Advanced enterprise needs may still require a sales conversation; Some listed customers cite the need for the team to be responsive during migrations [Profile (Markdown)](https://openaitools.app/tool/autosend.md) ## Sendmux Agents that need to handle email usually end up stitched together from two or three services: one platform for sending, another for receiving, and a pile of glue code to reconcile them. Sendmux collapses that into a single API surface. It covers outbound mail, agent mailboxes, routing controls, and delivery events, so an agent can send, receive, route, and react without juggling separate accounts and bills. A key design decision is that inbox data is formatted for machine consumption. Gmail and Outlook typically return full HTML bodies that burn thousands of tokens before the agent gets to the actual content. Sendmux strips signatures and quoted history by default and exposes links, headers, and attachment metadata only when asked, so the model spends its budget on the message rather than the markup. On the sending side, Sendmux is deliberately not a single-provider lock-in. A mailbox credential works as both a Bearer token for HTTP and a password for SMTP, and routing can be bound to specific providers, delivery groups, weights, and quota windows. Events arrive through signed webhooks, an SSE stream, or typed change polling, which means agents can react in real time rather than running polling loops. SDKs for TypeScript and Python, a CLI, framework integrations, and an MCP endpoint make it straightforward to wire the whole thing into an existing agent stack. **Pricing & Plans:** Sendmux is listed as free, with two free mailboxes available to start and agent onboarding designed to be self-service. Pricing beyond the initial free mailboxes is not detailed on the landing page, so check the pricing page for current tiers. - **Agent mailboxes:** Provision mailboxes on verified domains or a shared myagent.mx address, with clean JSON output that strips signatures and quotes. - **Provider-flexible sending:** Send over HTTP or SMTP using the same mailbox credential as a Bearer token and SMTP password, with Idempotency-Key retries and attachment support. - **Routing controls:** Bind keys to providers, delivery groups, weights, and quota windows so traffic stays inside the boundaries you set. - **Real-time events:** Signed webhooks for delivery and receipt events, an SSE stream for live mailbox clients, and typed change polling for resync. - **Developer tooling:** Official SDKs for TypeScript and Python, a CLI, LangChain and AI SDK integrations, and a hosted MCP endpoint with OAuth. **Strengths:** One API for sending, receiving, routing, and events; Inbox payloads tuned for LLM token efficiency; Not locked to a single sending provider; Practical developer tooling: SDKs, CLI, MCP, framework integrations **Limitations:** Newer platform, so the surrounding ecosystem and community material are still small; Using your own sending providers puts deliverability and domain reputation on you; Agent mailboxes still depend on correct DNS setup for verified domains [Profile (Markdown)](https://openaitools.app/tool/sendmux.md) ## Frequently Asked Questions ### How do AutoSend and Sendmux compare in monthly traffic? AutoSend has 12,928 monthly visits, while Sendmux has 37. Traffic estimates describe audience size, not product quality. ### How do their growth rates compare? AutoSend has a month-over-month growth rate of -50.1%; Sendmux has -98.3%. ### How does pricing compare? AutoSend: Paid, Contact for Pricing. AutoSend prices by email volume rather than contacts, with a free entry point for getting started, paid plans that scale with send volume, and enterprise arrangements via a demo; a $50-tier plan is referenced by a customer as supporting very large user counts. Sendmux: Free. Sendmux is listed as free, with two free mailboxes available to start and agent onboarding designed to be self-service. Pricing beyond the initial free mailboxes is not detailed on the landing page, so check the pricing page for current tiers. ## Alternatives | # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | 1 | [Mailchimp](https://openaitools.app/tool/mailchi-mp) | 10,071,636 | +1.1% | Freemium | AI-assisted email and SMS marketing that turns audiences into customers | [.md](https://openaitools.app/tool/mailchi-mp.md) | | 2 | [Klaviyo](https://openaitools.app/tool/klaviyo) | 6,674,207 | +6.1% | Paid | The AI-powered B2C CRM for email, SMS, and personalized marketing at scale | [.md](https://openaitools.app/tool/klaviyo.md) | | 3 | [Brevo](https://openaitools.app/tool/brevo) | 6,527,382 | +5.8% | Freemium | All-in-one customer platform for email, SMS, CRM, and automation | [.md](https://openaitools.app/tool/brevo.md) | | 4 | [MailerLite AI Drag & Drop Editor](https://openaitools.app/tool/mailerlite-ai-drag-drop-editor) | 4,999,868 | -3% | Freemium, Paid | AI-assisted newsletter editor for email, pages and forms | [.md](https://openaitools.app/tool/mailerlite-ai-drag-drop-editor.md) | | 5 | [GetResponse](https://openaitools.app/tool/getresponse-fr) | 2,174,621 | +1.3% | Free Trial, Paid | AI email marketing, automation and landing pages in one revenue platform | [.md](https://openaitools.app/tool/getresponse-fr.md) | | 6 | [Smartlead](https://openaitools.app/tool/smartlead-ai) | 952,377 | +4.3% | Free Trial, Paid | AI-native cold email platform for scaling outbound without limits | [.md](https://openaitools.app/tool/smartlead-ai.md) | | 7 | [Robly Email Marketing](https://openaitools.app/tool/robly-com) | 740,230 | +29.7% | Free Trial, Paid | Email marketing with AI send-time optimization to lift opens | [.md](https://openaitools.app/tool/robly-com.md) | | 8 | [Missive](https://openaitools.app/tool/missive) | 631,353 | +0.2% | Free Trial, Paid | Collaborative inbox and email management for teams | [.md](https://openaitools.app/tool/missive.md) | | 9 | [ActiveCampaign AI](https://openaitools.app/tool/activecampaign-ai) | 526,760 | +0.5% | Free Trial, Paid | Autonomous marketing automation powered by AI agents | [.md](https://openaitools.app/tool/activecampaign-ai.md) | | 10 | [Carly AI](https://openaitools.app/tool/carly-ai) | 340,001 | +1.5% | Freemium | Email an AI assistant and let it run your schedules, inbox and CRM | [.md](https://openaitools.app/tool/carly-ai.md) | --- Source: https://openaitools.app/compare/autosend-vs-sendmux More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)