Alternatives
10 best Agent 37 alternatives
Tools that cover the same task as Agent 37 (code), ranked by how completely their pricing, free tier and API access are documented. Checked Oct 4, 2026.
- Agent 37 starts at
- Not listed
- Free plan
- No free plan
- API
- API available
- 01
Maritime
Maritime hosts persistent AI agents, each in its own Firecracker micro-VM with durable disk. Agents sleep when idle, wake in about a second, and scale from a free tier to paid plans with configurable RAM, SSD, and always-on options.
Best for: Developers shipping user-specific or long-running agents who need isolated VMs with fast wake times.
- 02
Inkbox
Inkbox gives AI agents a unified identity with email, phone, iMessage, a public internet address, and Agent2Agent channels plus a credential vault. Y Combinator–backed Inkbox ships plugins for Claude Code, Codex, ChatGPT, and other agent hosts so agents can communicate like teammates.
Best for: Developers and startups operating multiple agents that need real-world contact surfaces and cross-channel memory.
- 03
smol machines
smol machines provides fast, hardware-isolated Linux microVMs that run locally via smolvm, in smol cloud, or self-hosted with the same SDK and .smolmachine artifact. Pricing combines hourly base machine fees plus consumption for CPU, memory, disk, and egress, with account credits for new users and tiered monthly platform fees on Pro and Startup plans.
Best for: Developers and platform teams who need portable microVMs for agent sandboxes, CI workloads, or always-on apps across laptop and cloud environments.
- 04
Amika
Amika provides multiplayer cloud workstations where developers and coding agents share VMs loaded with their preferred agents. Customers bring their own LLM keys and pay for platform access plus sandbox compute credits with concurrent sandbox limits per tier.
Best for: Developers and small teams running multiple coding agents in shared cloud sandboxes instead of local-only setups.
- 05
cmux
cmux is a free, open-source macOS terminal built on Ghostty for multitasking with AI coding agents. It adds vertical tabs, split panes, notification rings, an in-app browser, and optional cloud VMs on paid plans for remote agent sandboxes.
Best for: Mac developers running Claude Code, Codex, Gemini CLI, or other terminal agents who want organized workspaces and optional cloud VMs.
- 06
AgentMail
AgentMail is an email inbox API built for AI agents, giving each agent its own inbox to create threads, send and receive mail, handle attachments, and integrate via SDKs or MCP. The product targets developers wiring agents into real email workflows with multi-tenant controls and optional custom domains.
Best for: Developers and AI product teams that need programmatic email inboxes for agents rather than human Gmail workflows.
- 07
Brainbase Labs
Brainbase Labs hosts internal AI agents that self-improve through evaluations, observability, and hillclimbing. The platform offers managed agent APIs, orchestration across models and harnesses, sandboxes, auth, and deployment options from managed cloud to private cloud and on-premise.
Best for: Teams shipping production agents who want managed hosting, evals, orchestration, and enterprise deployment options.
- 08
Composio
Composio is an agent integration platform with 1,500+ toolkits, OAuth and trigger handling, SDKs, CLI, and MCP endpoints so coding agents and chat apps can call Gmail, Slack, GitHub, and other SaaS APIs securely. Hobby and Pro tiers meter tool calls and triggers while Enterprise adds SSO, governance, and custom billing.
Best for: Developers and teams shipping agents in Claude, Cursor, Codex, or custom harnesses who need managed OAuth, triggers, and a broad SaaS action catalog.
- 09
Agno
Agno is a self-driving agent platform with an open Agent SDK, AgentOS runtime, and control plane that runs in your cloud. Teams build and serve customer-facing or internal agents with sessions, traces, memory, knowledge, evals, and integrations to Claude Code, Codex, and Cursor.
Best for: Platform engineers owning agent infrastructure in their own cloud who want a control plane without usage-based egress fees.
- 10
Revdoku
Revdoku gives AI agents dedicated email inboxes with cloud storage, attachment handling, and REST, CLI, or MCP access. Teams provision mailboxes, connect AI workflows, and manage files generated by agents or APIs under EU hosting options.
Best for: Developers building AI agents that need real email addresses and file storage integrations.
Agent 37 alternatives: common questions
What is the best free alternative to Agent 37?
Maritime has an ongoing free plan. Free plan includes three agents forever with one machine running at once and Discord community support. Free plans change, so check the vendor before relying on one.
What is the cheapest Agent 37 alternative?
Revdoku has the lowest listed starting price at $9.99/mo.
Which Agent 37 alternatives have an API?
Maritime, Inkbox, smol machines, Amika, cmux mention API or developer access.