devenv vs FlyEnv

devenv uses Nix to define development environments for teams and CI. A project configuration can specify packages, languages, services, tasks, secrets, variables, files, and shell scripts. The project lists 58 supported languages and 42 preconfigured services, including PostgreSQL, Redis, MySQL, RabbitMQ, and Elasticsearch. Processes can be supervised with dependencies and restarts, while tasks can run in parallel and integrate with shells or commits. SecretSpec can read declared secrets from sources such as Keychain, 1Password, LastPass, dotenv, and environment variables. devenv can build OCI containers and run integration tests with its processes active; documentation also describes GitHub Actions use for checks, builds, and tests. It requires Nix and works on Linux, macOS, and WSL. As of devenv 2.4, the project no longer builds, tests, or releases it for Intel Macs. Projects must be explicitly trusted before automatic activation. The software is free and MIT licensed, with GitHub and Discord linked for help and community. Cached shell startup is listed as under 100 ms after the first build; devenv Cloud is in private beta.

FlyEnv is a desktop application for managing local development environments on Linux, macOS and Windows. It supports container-free local workflows and offline operation. Developers can install and switch among language runtimes including PHP, Node.js, Python, Java, Go, Ruby and Rust, then scope runtime settings to a project. Those settings are stored in a.flyenv file and control the toolchain used by terminals, editors and run commands. The local-site module includes settings for custom domains, document roots, server ports, PHP binding, rewrite rules, reverse proxies and HTTPS. Listed database integrations include MySQL, PostgreSQL, MariaDB, MongoDB, Qdrant, ClickHouse and Neo4j; its AI integrations include tools and services such as Codex, Ollama and Claude Code. The free plan includes 3 local sites and 3 custom projects per runtime. The Pro License costs 10.00 USD once and includes unlimited local sites and custom projects, with one active device at a time. FlyEnv is intended for personal or business development use.