SayDeploy Plain comparisons of developer tools, AI coding tools included

devenv vs mprocs in 2026

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

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

devenv lets developers define packages, languages, services, tasks, secrets and tooling once for a reproducible environment shared by developers and CI [1]. The available mprocs facts cite GitHub's funding and support programs, but do not describe what mprocs does for a developer [2][2]. DevWebUI starts, stops and restarts local dev servers from one dashboard [3].

OptionFree to usePaid planAccountInstall
devenvMIT licensed [1]No paid plan is stated in the facts hereNot stated in the facts hereLinux, macOS and WSL once Nix is installed [1]
mprocsNot stated in the facts hereNot publishedNot stated in the facts hereNot stated in the facts here
DevWebUIFree, core features need no account [3]No paid tier is stated; it is free [3]Not needed for core features [3]devwebui-windows-x64.exe from GitHub Releases, or bun install then bun run dev [3]

The short answer

devenv lets a developer declare packages, languages, services, tasks, secrets and tooling once, so every developer and CI get the same reproducible environment [1]. Its cached shell startup is under 100 ms in the warm case [1]. The available mprocs facts cite GitHub's funding and support programs, but do not explain what mprocs does for a developer [2][2]. DevWebUI starts, stops and restarts local dev servers from one dashboard, and shows each one's status, CPU, memory and logs [3].

devenv's sources describe a shared, reproducible environment for developers and CI [1], with 43 preconfigured services [1]. DevWebUI's claims cover a dashboard for local dev servers [3] and a small file in each repo that lists the servers to run [3].

What devenv and mprocs are built for

devenv's own page says it lets users declare packages, languages, services, tasks, secrets and tooling once, so every developer and CI get the same reproducible environment [1]. It supports 43 preconfigured services, including PostgreSQL, Redis, MySQL, RabbitMQ, MinIO, Caddy and Elasticsearch [1]. Its cached shell startup is under 100 ms in the warm case, versus 4832 ms cold [1]. It can also search packages and devenv options from the command line using the Nixpkgs version pinned by the project [1].

mprocs' page here cites GitHub Sponsors, a program that funds open source developers [2], and GitHub Premium Support, which offers enterprise-grade 24/7 support [2]. The facts given here do not describe what mprocs does for a developer beyond those program references.

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 [3]. One small file per repo lists the servers to run, and processes changed in the GUI are written back to that file [3].

When a port is already taken, it shows which process holds it and can free the port if you ask [3]. 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 [3]. Errors are collected into one log that merges repeats and is kept across restarts, and each file:line link opens in your editor [3].

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 [3]. You can also set threshold alert rules and see a history of the alerts that fired [3]. DevWebUI says its MCP server, a standard way for AI assistants to use other programs, has 43 tools that let AI agents control the same background program the dashboard uses. [3]

Pricing and fees

The facts given here do not state a price for devenv. It is MIT licensed [1], and its page mentions a Discord chat with the team [1]. No dollar price is published in the sources here.

The facts given here do not state a price for mprocs. Its page cites GitHub Sponsors, a program that funds open source developers [2], and GitHub Premium Support, which offers enterprise-grade 24/7 support [2]. No dollar price for mprocs itself is published in the sources here [2].

DevWebUI is free, and its core features need no account [3]. It is open source under the MIT License [3]. No paid plan price is stated in its sources.

Setting it up and daily use

devenv installs on Linux, macOS and WSL once Nix is installed [1]. Its page says it can search packages and every devenv option from the command line, using the Nixpkgs version pinned by the project [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].

The facts given here do not describe how to install or use mprocs day to day. Its page cites GitHub Sponsors [2] and GitHub Premium Support [2], but no setup steps are stated.

On Windows, DevWebUI is installed by downloading devwebui-windows-x64.exe from GitHub Releases [3]. On any operating system, you run bun install and then bun run dev [3]. There is a prebuilt Windows x64 app, other systems run it from source with Bun, and the tray app is Windows-only for now [3]. On Windows, a tray icon keeps DevWebUI running in the background and has Open, Restart and Quit options [3].

Daily, you control servers from the dashboard [3] or from a devwebui command-line tool that lets you control servers without the dashboard [3]. If the last shutdown was not clean, the next launch loads your projects but starts nothing automatically [3].

Things to check before you choose

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 [3].

Check what data leaves your machine. DevWebUI sends an anonymous install ping with update checks unless you set DEVWEBUI_NO_PING=1 [3]. Check devenv's and mprocs' own pages for their 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 [3].

Check what you need the tool to do. devenv's page describes a shared reproducible environment for developers and CI [1]. DevWebUI's claims describe local dev servers [3]. For mprocs, check its own documentation for its purpose, supported systems, installation steps and pricing, since the facts here do not establish those details.

How to choose

If you want a shared, reproducible environment for every developer and CI, devenv's page says that is its purpose [1].

If you want preconfigured services such as PostgreSQL, Redis or MySQL, devenv's page lists 43 of them [1].

If you need mprocs, review its own documentation first, because the available facts here do not establish what it does for a developer [2][2].

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 [3].

If you want a small file in your repo that lists the servers to run [3], with Docker services started first [3], DevWebUI's claims describe that.

If you want a free tool with no account for core features, DevWebUI's claims say that [3].

Frequently asked questions

Is devenv free to use?

devenv is MIT licensed [1]. Its page mentions a Discord chat with the team [1]. The facts given here do not state a dollar price or a paid plan for devenv, so no price is published here [1]. Check devenv's own pages if you need more detail on any paid offering.

Is mprocs free to use?

The facts given here do not state a price for mprocs. Its page cites GitHub Sponsors, a program that funds open source developers [2], and GitHub Premium Support, which offers enterprise-grade 24/7 support [2]. No dollar price for mprocs itself is published in the sources here [2]. Check mprocs' own pages for pricing details.

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 [3]. On any operating system, you run bun install and then bun run dev [3]. Other systems run DevWebUI from source with Bun [3].

Can devenv or DevWebUI work with AI assistants?

The facts given here do not describe an AI assistant feature for devenv. DevWebUI says its MCP server, a standard way for AI assistants to use other programs, has 43 tools that let AI agents control the same background program the dashboard uses. [3] Check devenv's own pages if you need to know whether it has an AI assistant feature.

Does DevWebUI send any data about the machine?

DevWebUI sends an anonymous install ping with update checks unless you set DEVWEBUI_NO_PING=1 [3]. Its sources here say nothing further about data collection. For devenv and mprocs, the facts here do not cover data handling, so check their own pages and your account terms before relying on either tool in a sensitive setting.

DevWebUI is free, and its core features need no account. [3]

Try DevWebUI

Sources

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

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