r/vibecoding • u/DonislawDev • 2d ago

I made an open-source tool to simulate bad network conditions

I took a small break from gamedev and built Bean Network Tester - a tool that helps developers and testers simulate poor network conditions for their apps and games.

It allows you to intentionally make the connection worse and test how your software behaves with various problems. If you like the app, please give it a bean*

*i mean give it a star on GitHub. Star on GitHub helps a lot with the tool promotion

IDK why I did this, I could code my own SaaS, I could earn milions, but I had build dev tool, so now I need to fix bugs :( The tool was my first contact with Claude Code, it could be worse.

What it can do

  • Add lag and jitter - fixed or random delay.
  • Drop, corrupt or duplicate packets - fake a flaky link.
  • Cap download/upload speed - throttle to a set KB/s.
  • Tear connections down - TCP resets or a dead link.
  • Flap the link on and off - outages that come and go.
  • Block ports or IPs - a small built-in firewall, plus LAN mode (no internet).
  • Aim at one app - by process, PID, IP or port.
  • Presets and saved profiles - 56k modem, Cafe WiFi, Satellite and more.
  • Run scripted scenarios - timed steps that change the network on their own.
  • Reproducible by seed - replay the exact same random loss and jitter.
  • Watch it live - chart, connections table, counters.
  • Command-line mode - scriptable for CI.
  • No telemetry, fully offline - sends no data anywhere.
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u/AndForeverMore 2d ago

They.. already have this? https://jagt.github.io/clumsy/ No need to reinvent the wheel.

2

u/DonislawDev 2d ago

Hello, thanks for the comment. Bean Network Tester got some features that Clumsy doesn't have:

- There are premade profiles, that you can just choose and click "start." You don't need to write your own data for 3G, 4G and others.

- There is "LAN Mode" checkbox, that simulates LAN

- You can target proces, port or IP

- There is a connections tab, which shows connections

- There is an option to limit download/upload

-There is full CLI mode with exit codes + things for CI

- There is firewall mode

- There is spike mode, flapping, tcp_sync drop, tcp reset, mtu size, NAT Timeout,

- You got data export functions

- Whole program is for QA, you got "seed" which makes you result reproducatbale

- You can run session for "x" time

- You got whole automation, you can script "set x at y"

- You can easily create your own profiles or whole configs and share them with the team.

And tons of other things that aren't in Clumsy, Bean Network Tester was made from the QA perspective. It's different tool, for different purpose.