rehydra scans LLM prompts for accidental personal information before they reach a model.
Open source
17 alternativesGreywall
Greywall provides a deny-by-default sandbox for AI coding agents, with kernel-enforced isolation on Linux and macOS.
About Greywall
Greywall is a container-free sandbox for AI coding agents on Linux and macOS. In deny-by-default mode it restricts filesystem access, network connections and system calls to what is explicitly allowed, and blocks commands such as rm -rf / and git push --force.
It also provides greywatch, an allow-by-default mode that logs network activity through greyproxy with a dashboard, and a learning mode that traces filesystem use to generate least-privilege profiles. Built-in profiles cover tools including Claude Code, Cursor and Codex. Linux use requires bubblewrap and socat.
Key features
- Deny-by-default filesystem limited to working directory unless allowed
- Network routing through greyproxy with live allow/deny dashboard
- Command blocking for commands like rm -rf /
- Built-in profiles for Claude Code, Cursor, Codex and others
- Learning mode traces access and generates least-privilege profiles
- Observability mode allows all network while logging activity
Best for: Developers on Linux or macOS who run AI coding agents and want to limit filesystem and network access.
Good for
- Works without containers or Docker overhead
- Includes one-command profiles for common AI coding agents
- Provides learning and observability modes to review activity before locking down
Watch out for
- Linux use requires installing bubblewrap and socat
- Manual release tarballs include only the greywall binary
- Supports only Linux and macOS
Greywall at a glance
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, macOS
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Greywall alternatives
Tools and sites you could use instead, ranked by how closely they match.
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Open source
15 alternatives
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Greywall FAQ
What is the difference between greywall and greywatch?
greywall denies filesystem and network access by default to only what is allowed, while greywatch uses a permissive filesystem and allows all network requests but logs them on the greyproxy dashboard.
How can Greywall be installed?
On macOS with Homebrew, on Linux or Mac with install.sh, or with Go install, mise, manual tarballs, or building from source.
What dependencies are needed on Linux?
bubblewrap and socat are required, while xdg-dbus-proxy and libsecret-tools are optional. Status can be checked with greywall check.
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