RoBrain vs Vmette

RoBrain and Vmette are both agent frameworks tracked by AIDiveForge. Below is a side-by-side comparison of pricing, capabilities, platforms, and ownership — sourced from each tool's live website and verified before publishing.

RoBrain

RoBrain sits between your team's AI coding tools — Claude Code, Cursor, Copilot, Codex CLI — and a shared Postgres instance, capturing not just decisions but the alternatives your team ruled out. An MCP server runs inside the editor and surfaces relevant history before the agent acts; a batch Synthesis scan reads the whole corpus on a schedule to flag contradictions and drift that no single session would catch. That cross-session contradiction detection is where it separates from alternatives that only check at insertion time or silently delete the losing decision. Self-hosted on Apache 2.0 with your own Postgres; cloud extraction and the Planning API are paid-only features.

Vmette

The threat model vmette solves is concrete: prompt injection on a fetched web page, a malicious package in an AI-suggested install, or model output that does something you didn't intend — all of it lands inside the VM, not on your host. The isolation is hardware-level, not a container namespace that a determined process can escape. Because everything runs on-device, no agent output leaves your machine to a third-party cloud sandbox. The ceiling appears at the edges: vmette is macOS-only, and teams whose agents need to run on Linux servers or in CI pipelines will need a different isolation strategy.

Attribute	RoBrain	Vmette
Pricing	Paid	Free
Free trial	No	No
Open source	Yes	Yes
Has API	Yes	No
Self-hosted option	Yes	Yes
Platforms	Node.js 18.18+, npm/pnpm; Docker for local Postgres + Perception API; integrates with Claude Code, Cursor, Copilot, Codex CLI	macOS 11+
Released	2026	—
Pros	Stores rejected alternatives as a structured field alongside each decision, so the agent surfaces why an approach was ruled out — not just what was chosen — before it re-proposes something your team already vetoed. Cross-session Synthesis scan reads the entire decision corpus on a schedule, so contradictions that accumulate across weeks and multiple developers get flagged rather than sitting invisible until they cause a revert. Old and new decisions both stay queryable when your team changes course, so reconstructing why a reversal happened is a query, not a memory exercise — unlike tools that silently replace the losing decision. One shared Postgres for the whole team works across Claude Code, Cursor, Copilot, and Codex CLI simultaneously, so a decision made in one editor is visible to an agent running in another without manual sync. Apache 2.0 self-hosted path keeps decision history on infrastructure you control, so teams with data residency requirements or cost sensitivity on API calls can run the full open-source layer without a cloud dependency.	Hardware-isolated VM boundary rather than a container namespace, so a misbehaving agent or malicious package cannot reach your host filesystem or credentials through a kernel-sharing escape path. ~1-second boot time on macOS, which means the isolation overhead does not force you to batch or pre-warm — each agent invocation gets a fresh, ephemeral environment without a meaningful delay penalty. Fully on-device with no cloud dependency, so agent output, file contents, and API tokens passed into the VM never transit a third-party sandbox service. MIT-licensed and free with no commercial tier, so teams that would otherwise pay for a hosted sandbox can run unlimited isolated executions without metering or subscription cost. MCP integration is documented, which means Claude Code, Cursor, and other MCP-compatible agents can delegate execution directly without a custom integration layer.
Cons	The automatic pre-action warning — surfacing veto context before an agent makes an unsafe suggestion — is a cloud-only feature; self-hosted teams trigger inject queries manually via the CLI, which means the protection only fires when a developer remembers to ask for it, not automatically at the moment of risk. Synthesis runs as a scheduled batch scan, not in real time; a contradiction introduced between scans will not be flagged until the next run, so teams moving fast in a single day can still ship a conflicting decision before the corpus-wide check catches it. The value scales with history depth and team size — the vendor's own qualifier is that a project under a few months old with a single developer and one AI tool does not justify the setup cost. Teams in that situation who set this up and find the overhead exceeds the benefit tend to revert to a maintained CLAUDE.md and revisit RoBrain only when the codebase and team grow.	macOS-only: teams whose agents run in Linux-based CI pipelines, on Linux developer workstations, or in any cloud environment hit a hard stop — the virtualization layer is Apple-specific, and there is no Linux port described in the repository. Those teams route to a different isolation solution entirely. No API surface: external systems cannot programmatically query vmette's state, inspect VM lifecycle, or integrate isolation into orchestration tooling beyond what the MCP interface exposes. Teams building automated pipelines with custom tooling will find the integration surface thin. Early-stage project with a single-digit star count and no open issues, which means community-sourced debugging help, third-party tutorials, and documented production war stories are absent — teams encountering edge cases in agent behavior are working from the README and source alone.

Bottom line

RoBrain is paid while Vmette is free; only RoBrain exposes a public API. Choose based on which difference matters most for your workflow.

Frequently asked questions

What is the difference between RoBrain and Vmette?

RoBrain is Paid and open source, while Vmette is Free and open source. Compare pricing, free trial, API, platforms, and pros/cons in the table above on AIDiveForge.

Is RoBrain better than Vmette?

It depends on your workflow. Use the side-by-side attributes (pricing, open source, API, self-hosted, platforms) to decide. AIDiveForge does not rank a universal winner — we publish verified facts so you can choose.