SayDeploy Plain comparisons of developer tools, AI coding tools included

DevWebUI vs devenv in 2026

DevWebUI and devenv compared on what each does, what each costs, how each is installed and what to check before you pick one for your dev servers.

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

devenv declares a dev environment once so every developer and CI get the same one, and can build containers and ship a Nix derivation from it. DevWebUI starts, stops and restarts local dev servers from one dashboard and shows each one's status, CPU, memory and logs.

OptionFree to usePaid planAccountInstall
devenvMIT licensed, so free to use [1]No paid plan is stated in its facts [1]Not stated in its factsOnce Nix is installed, on Linux, macOS and WSL [1]
DevWebUIFree, core features need no account [2]No paid tier is stated; it is free [2]Not needed for core features [2]devwebui-windows-x64.exe from GitHub Releases, or bun install then bun run dev [2]

The short answer

devenv lets a developer declare packages, languages, services, tasks, secrets and tooling once, so every developer and CI gets the same reproducible environment [1]. DevWebUI starts, stops and restarts local dev servers from one dashboard, and shows each one's status, CPU, memory and logs [2].

devenv's sources say it covers a reproducible environment for developers and CI [1], building OCI containers from the dev environment [1], and running integration tests with all processes active [1]. DevWebUI's sources cover a dashboard for starting and watching local servers [2], a small file in each repo that lists the servers to run [2], and a way for AI assistants to control your dev servers through 43 tools [2].

What devenv is built for

devenv's own page says it lets you define packages, languages, services, tasks, secrets and tooling once, and gives every developer and CI the same fast, reproducible environment [1].

It supports 43 preconfigured services, including PostgreSQL, Redis, MySQL, RabbitMQ, MinIO, Caddy and Elasticsearch [1]. It can build OCI containers from the development environment, with the same packages, versions and behavior [1]. It can run integration tests with all processes active using devenv test [1].

It can load secrets from Keychain, 1Password, LastPass or dotenv without committing their values [1]. It can ship a Nix derivation built from the dev environment as a deployable artifact [1]. Its cached shell startup is under 100 ms in the warm case, versus 4832 ms cold [1]. It is MIT licensed [1].

What DevWebUI is built for

DevWebUI is made by the team that publishes this site.

It lets you start, stop and restart your local dev servers from one dashboard, and see each one's status, CPU, memory and logs [2]. One small file per repo lists the servers to run, and processes changed in the GUI are written back to that file [2].

When a port is already taken, it shows which process holds it and can free the port if you ask [2]. You can open any server it manages through one DevWebUI address on your own machine, and live page reloading in your browser keeps working through it [2]. Errors are collected into one log that merges repeats and is kept across restarts, and each file:line link opens in your editor [2].

A setting in the repo file can start the project's Docker services first, such as a database, wait until they are ready and pass their connection settings to your servers [2]. You can also set threshold alert rules and see a history of the alerts that fired [2]. AI assistants can control your dev servers through 43 tools, using the same background service as the dashboard [2].

Pricing and fees

The devenv facts given here do not state a price, so its price is not published here. It is MIT licensed [1].

DevWebUI is free, and its core features need no account [2]. It is open source under the MIT License [2]. No paid tier price is stated in its sources.

Setting it up and daily use

devenv installs on Linux, macOS and WSL once Nix is installed [1]. It can search over 100,000 packages and every devenv option from the CLI, using the Nixpkgs version pinned by the project [1]. Its page says nothing more about setup or routine use here.

On Windows, DevWebUI is installed by downloading devwebui-windows-x64.exe from GitHub Releases [2]. On any operating system, you run bun install and then bun run dev [2]. There is a prebuilt Windows x64 app, other systems run it from source with Bun, and the tray app is Windows-only for now [2]. On Windows, a tray icon keeps DevWebUI running in the background and has Open, Restart and Quit options [2].

Daily, you control servers from the dashboard [2] or from a devwebui command-line tool that lets you control servers without the dashboard [2]. If the last shutdown was not clean, the next launch loads your projects but starts nothing automatically [2].

Things to check before you choose

Ask what you need the tool to do: declare one reproducible environment for developers and CI, or start and watch local dev servers. devenv's page speaks of a reproducible environment for every developer and CI [1], and DevWebUI's claims speak of local dev servers [2].

Check your operating system. devenv works on Linux, macOS and WSL once Nix is installed [1]. DevWebUI has a prebuilt Windows x64 app, and other systems run it from source with Bun [2].

Check what data leaves your machine. DevWebUI sends an anonymous install ping with update checks unless you set DEVWEBUI_NO_PING=1 [2]. Check devenv's own pages for its data handling, since the facts here do not cover it.

Check access control if others can reach the tool. DevWebUI can be set to ask for a key before other programs can control it, and a browser gets that key by typing a 6-digit pairing code, with a few listed exceptions [2].

How to choose

If you want one declared environment that every developer and CI gets the same, devenv's page says that is what it does [1].

If you want to build OCI containers from the dev environment, devenv's page describes that [1].

If you want to run integration tests with all processes active, devenv's page describes devenv test [1].

If you want to start, stop and restart local dev servers from one dashboard with status, CPU, memory and logs, DevWebUI's claims describe that [2].

If you want a small file in your repo that lists the servers to run [2], with Docker services started first [2], DevWebUI's claims describe that.

If you want a free tool with no account for core features, DevWebUI's claims say that [2].

Frequently asked questions

Is devenv free to use?

The devenv facts given here do not state a price, so its price is not published here. It is MIT licensed [1]. Check the project's own pages if you need more detail on cost or paid plans.

Is DevWebUI free and open source? [[c:devwebui-price]]

DevWebUI is free, and its core features need no account [2]. It is open source under the MIT License [2]. The sources here do not state any paid tier, so the only price they give is free [2]. Check the project's own pages if you need more detail on future plans.

How do you install devenv and DevWebUI?

devenv installs on Linux, macOS and WSL once Nix is installed [1]. On Windows, DevWebUI is installed by downloading devwebui-windows-x64.exe from GitHub Releases, and on any OS you run bun install and then bun run dev [2]. Other systems run DevWebUI from source with Bun [2].

Can devenv or DevWebUI work with AI assistants like Claude?

The devenv facts given here do not mention AI assistant support, so check its own pages. DevWebUI lets AI assistants control your dev servers through 43 tools, using the same background service as the dashboard [2].

Does DevWebUI send any data about the machine?

DevWebUI sends an anonymous install ping with update checks unless you set DEVWEBUI_NO_PING=1 [2]. Its sources here say nothing further about data collection. For devenv, the facts here do not cover data handling, so check its own pages before relying on either tool in a sensitive setting.

DevWebUI is free, and its core features need no account. [2]

Try DevWebUI

Sources

  1. devenv, devenv.sh, read 2026-10-20
  2. DevWebUI's own description of itself (the product of this site's publisher)

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