How to stop stray background processes for AI coding tool users in 2026

Q: Is DevWebUI free for AI coding tool users?

DevWebUI is free, and its core features need no account. It lists each managed server with its status, CPU, memory and logs, so you can check what is still running. There is a prebuilt Windows x64 app; on other systems you run it from source with Bun.

Learn how to find and stop stray background processes left by AI coding tools, with steps, common mistakes and a tool option.

By SayDeploy · 2026-10-27

SayDeploy is published by LunarWerx, which makes some of the tools compared here.

Find the processes an AI coding tool left running, match each one to its project, stop the leftovers, and check that their ports are free. Restart only the services you need, one at a time.

Option	What it does	Cost
DevWebUI	Starts, stops and restarts local dev servers from one dashboard, and shows status, CPU, memory and logs. ^[1]	Free, and core features need no account. ^[1]
Terminal commands	Stops a process when you type the command for it.	not published
Saved project scripts	Runs a saved set of commands to stop or restart services.	not published

What you need before you start

Before you stop stray background processes, know which ones belong to your project. An AI coding tool may start a dev server, a file watcher or a test runner and leave it running after the session ends, so list what is running before you change anything.

Note the port each process uses, the folder it was started from and the command that started it. Make sure you can tell your project processes apart from system programs, so you do not stop something you need. Keep your terminal open to the same folder so you can check output as you go.

Decide in advance whether you want to stop everything or only the processes from one project. Having this list ready makes it easier to stop the right processes and to start them again later.

Step by step

List every process your session started. Write down its name, the folder it runs from and the port it uses, so the full set is visible before you stop anything.

Match each process to its project. Group processes by folder or port, and mark any that belong to another project you still need.

Stop the leftovers that no project needs. Begin with processes that hold a port, because they are the most likely to block the next start.

Check that each port is free. A port that is still in use after a stop can mean a child process is still running, so look for it before continuing.

Read the output from the stop step. A failure to stop can point to a process that was started by another tool or by a script.

Restart only the services you need, one at a time. Starting them in order makes it clear which one causes a problem.

Save the working list of commands or settings. A saved list makes the cleanup easier to repeat after the next session.

Repeat the check at the end of each session. Looking at running processes after work prevents them from piling up.

Tools that can do it

DevWebUI is made by the team that publishes this site. DevWebUI lets you start, stop and restart local dev servers from one dashboard, and see each one's status, CPU, memory and logs. ^[1] When a port is already taken, DevWebUI shows which process holds it and can free the port if you ask. ^[1] It also collects errors into one log that merges repeats and is kept across restarts. ^[1] If you prefer the command line, a devwebui command-line tool talks to the same REST API, so you can control processes without the GUI. ^[1] There is a prebuilt Windows x64 app; on other systems you run it from source with Bun. ^[1]

Terminal commands are another option. You type a command to stop a process, which requires you to know its name or number, and you repeat that step by hand each time.

Saved project scripts can group the same commands so they run together. Check whether a script stops child processes as well as the main one, since a leftover child process is a common cause of a busy port.

For any option, check how it finds the process it stops, how it handles ports, and which operating systems it supports. The facts for the other options are not listed here, so check each tool's own documentation before you choose.

Common mistakes to avoid

Stopping a process by name alone can end the wrong one, especially when several projects use the same tool. Check the folder or port first. Leaving processes from an earlier session running is one common reason ports stay busy, so review the list at the start of each session.

Restarting everything at once makes it hard to see which service caused a failure. Ignoring the output can hide the message that explains why a process would not stop. Changing ports or settings without writing them down makes the cleanup hard to repeat. Test the stop and start steps after each change so the setup stays understandable.

Frequently asked questions

How can AI coding tool users stop stray background processes?

Start by listing what is running, then match each process to its project folder or port. Stop the leftover ones, check that their ports are free, and restart only the services you need. Doing this in a fixed order makes it clear which process caused a problem and avoids stopping something a project still depends on.

Is DevWebUI free for AI coding tool users?

DevWebUI is free, and its core features need no account. ^[1] It lists each managed server with its status, CPU, memory and logs, so you can check what is still running. ^[1] There is a prebuilt Windows x64 app; on other systems you run it from source with Bun. ^[1]

Can DevWebUI free a port that a leftover process is holding?

When a port is already taken, DevWebUI shows which process holds it and can free the port if you ask. ^[1] Check the process name before freeing the port, so you do not stop a program you still need. After the port is free, restart only the services you want to keep running.

Does DevWebUI start processes again after an unclean shutdown?

If the last shutdown was not clean, the next launch loads your projects but starts nothing automatically. ^[1] Review the projects that loaded, then start only the servers you need, one at a time. Starting them individually makes any leftover process easier to spot before it causes a conflict.

Can DevWebUI collect errors from several running servers in one place?

DevWebUI collects errors into one log that merges repeats and is kept across restarts, and each file:line link opens in your editor. ^[1] That helps you see which server produced a failure without searching separate windows. Check the log before restarting, so the messages are still there to read.

DevWebUI is free, and its core features need no account. ^[1]

Try DevWebUI

Sources

DevWebUI's own description of itself (the product of this site's publisher)