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Pocketenv vs tethered

Offers a sandbox runtime for agents and humans, but does not enforce per-process network allow-lists.
Pocketenvthe universal sandbox runtime for agents and humanstetheredYour app's network firewall — in one function call.

Side by side

What it is
Pocketenv:Pocketenv provides a universal sandbox runtime to instantly launch secure, isolated dev environments for code, agents, and teams.
tethered:tethered is a zero-dependency Python library that enforces outbound network allow-lists at runtime.
Best for
Pocketenv:Unified sandbox platform for agents and humans
tethered:In-process network firewall for Python
Who it’s for
Pocketenv:Developers, AI agents, and teams needing fast, portable execution environments.
tethered:Python developers who need runtime network egress control, including AI-generated code and third-party libraries.
Pricing
Pocketenv:Free
tethered:Open source
Open source
Pocketenv:Yes, 72 GitHub stars
tethered:Yes, 10 GitHub stars
Works with
Pocketenv:Cloudflare Sandbox, Deno Sandbox, Vercel Sandbox, Daytona, Modal, E2B
tethered:requests, httpx, aiohttp, Django, Flask, FastAPI
DevHunt upvotes
Pocketenv:73
tethered:1
Launched on DevHunt
Pocketenv:Apr 2026
tethered:Mar 2026

Pocketenv features

  • Multi-provider sandbox support. Run environments on Cloudflare, Deno, Vercel, Daytona, Modal, E2B and more via a single interface.
  • Instant disposable environments. Spin up isolated dev environments in seconds that are automatically destroyed when done.
  • Git repository loading. Clone and work with any Git repo directly inside the sandbox.
  • Secure port and service exposure. Expose ports and services safely without exposing your host network.
  • Browser-based VS Code. Launch a full VS Code instance in the browser from within the sandbox.
  • Reproducible environment sharing. Create shareable links that reproduce the exact sandbox state for collaborators.
  • Point-in-time backups. Rollback a sandbox to a previous state using built-in backup snapshots.
  • CLI installation. Install Pocketenv via a single curl command for quick local access.
Pocketenv on DevHunt →Alternatives

tethered features

  • Process-wide activation. Call activate() once to set a global allow-list for all outbound sockets.
  • Scoped tightening. Use scope() to apply tighter restrictions to specific code paths or libraries.
  • Zero external dependencies. Implements checks by hooking Python's native socket layer, no extra packages needed.
  • Works with common frameworks. Compatible with requests, httpx, aiohttp, Django, Flask, FastAPI, and any socket-based library.
  • Subprocess propagation. Automatically propagates policies to child processes via site-packages bootstrap.
  • Locked-mode integrity checks. Detects tampering of policy payloads and filesystem changes.
  • DNS divergence repair. Falls back to safe DNS resolution when standard lookup fails.
  • Simple API. One-line allow-list declaration blocks unauthorized network calls with EgressBlocked exceptions.
tethered on DevHunt →Alternatives

Based on each tool's website and DevHunt data. Details may change; check the official sites.