Alternatives
10 best Mainbrella alternatives
Tools that cover the same task as Mainbrella (ai agent sandboxes), ranked by how completely their pricing, free tier and API access are documented. Checked Oct 7, 2026.
- Mainbrella starts at
- $5/mo
- Free plan
- Free trial
- API
- API available
- 01
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.
- 02
Mem0
Mem0 provides persistent memory infrastructure for AI agents and applications so context survives across sessions, users, and agents. The platform offers hosted plans with SDK integration plus open-source options for developers building production agents that need durable recall.
Best for: Agent builders and app teams that need hosted memory layers with defined add and retrieval quotas.
- 03
Pre.dev
pre.dev is a long-horizon coding agent that plans, builds, and verifies software over extended runs in the browser or terminal. It connects to many SaaS tools, publishes previews, and sells separate RL coding tasks to AI labs through pre.dev Labs.
Best for: Developers and teams who want an autonomous coding agent with planning, verification, integrations, and optional enterprise RL task sourcing.
- 04
Freestyle
Freestyle provides full Linux VMs purpose-built for long-running AI agents with millisecond startup, live cloning, pause/resume, nested Docker, and custom networking. Developers use the VMs for coding agents, browser automation, and containerized workloads.
Best for: Teams building autonomous agents that need persistent Linux environments, previews, and Docker inside the VM.
- 05
Code Interpreter SDK
E2B provides secure cloud sandboxes and Code Interpreter SDKs so agents run code in isolated microVMs.
Best for: Teams building AI agents, code interpreters, or eval harnesses that need isolated machines with shell, filesystem, and browser access.
- 06
Frederick
Frederick provides AI agents that build software, run background jobs, and operate browser sessions on behalf of startup teams. The product bundles coding agents, scheduled background workers, shared multiplayer workspaces, and hosted compute so founders can ship apps and automate go-to-market tasks from one control plane.
Best for: Founders and small teams who want autonomous coding, browser, and background agents instead of stitching separate dev and ops tools.
- 07
KERNEL
KERNEL provides cloud browser infrastructure for AI agents and web automations, spinning up sandboxed Chromium sessions with stealth, managed auth, GPU acceleration, live view, and telemetry. Developers connect via CDP, WebDriver BiDi, Playwright, OpenAPI, MCP, or official SDKs in TypeScript, Python, and Go.
Best for: Teams building QA, healthcare, e-commerce, or GTM agents that need reliable real-browser automation at scale.
- 08
Brnch
Brnch is code hosting built for people and AI-agent sessions, with revision-bound approvals and signed merge receipts. It records who authored and approved a change and which independent checks ran on the merged tree. MCP clients can inspect repositories, while paid plans add hosted coding agents, AI review and previews.
Best for: Teams wanting traceable agent contributions, protected merges and an assistant connection to hosted repository data.
- 09
ClevAgent
ClevAgent is a companion workspace for running AI coding agents with built-in safety and efficiency guardrails. The site describes natural chat with agents, real-time interventions for risky commands or secrets, and pricing previews for Free and Pro tiers ahead of launch.
Best for: Developers orchestrating multiple agents who want guardrails for secrets, dangerous commands, and workflow efficiency.
- 10
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.
Mainbrella alternatives: common questions
What is the best free alternative to Mainbrella?
cmux has an ongoing free plan. Free tier includes the native macOS terminal, local agents with your own API keys, and community support at $0/month. Free plans change, so check the vendor before relying on one.
What is the cheapest Mainbrella alternative?
Brnch has the lowest listed starting price at $8/mo, compared with $5/mo for Mainbrella.
Which Mainbrella alternatives have an API?
cmux, Mem0, Pre.dev, Freestyle, KERNEL mention API or developer access.