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Pocketenv vs tethered
Short answer: Pick Pocketenv if you want unified sandbox platform for agents and humans; pick tethered if you want in-process network firewall for Python. Pocketenv is free; tethered is free and open source.
Pocketenvthe universal sandbox runtime for agents and humans
tetheredYour app's network firewall — in one function call.Which to pick
Pick Pocketenv if you want…
- Unified sandbox platform for agents and humans
- Isolated execution environments
- Integrations with Cloudflare Sandbox, Deno Sandbox or Vercel Sandbox (on Pocketenv's list, not tethered's)
Pick tethered if you want…
- In-process network firewall for Python
- Integrations with requests, httpx or aiohttp (on tethered's list, not Pocketenv's)
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
- Starting price
- Pocketenv:Free
- tethered:Free
- Free plan or trial
- Pocketenv:Free to use
- tethered:Free to use
- 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
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.
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.
Pocketenv vs tethered FAQ
What is the difference between Pocketenv and tethered?+
Pocketenv: Offers a sandbox runtime for agents and humans, but does not enforce per-process network allow-lists.
Should I use Pocketenv or tethered?+
Pick Pocketenv if you want unified sandbox platform for agents and humans, isolated execution environments or integrations with Cloudflare Sandbox, Deno Sandbox or Vercel Sandbox (on Pocketenv's list, not tethered's). Pick tethered if you want in-process network firewall for Python or integrations with requests, httpx or aiohttp (on tethered's list, not Pocketenv's).
Is Pocketenv or tethered free?+
Yes, both are free, and tethered is open source.
Is Pocketenv or tethered open source?+
Yes, both are open source: Pocketenv (pocketenv-io/pocketenv on GitHub, MPL-2.0 license) and tethered (shcherbak-ai/tethered on GitHub, MIT license).
Do Pocketenv and tethered integrate with the same tools?+
Their integration lists don't overlap: Pocketenv lists Cloudflare Sandbox, Deno Sandbox, Vercel Sandbox, Daytona and 2 more; tethered lists requests, httpx, aiohttp, Django and 2 more.
On DevHunt
Pocketenv
73 upvotes · Launched on DevHunt on Apr 7, 2026
Based on each tool's website and DevHunt data. Details may change; check the official sites.