appimagetool vs electron-builder

appimagetool is a free Linux command-line utility that creates an AppImage from an existing AppDir. It is intended for application authors packaging desktop Linux software for distribution across common Linux distributions. The project describes it as a low-level component and recommends community higher-level tools for most users. Command-line options cover listing AppImage files, setting or guessing update information, selecting Squashfs compression, and excluding files. GPG signing is supported with a signing key and additional arguments. When update information is embedded and zsyncmake is installed, the tool can create a zsync file. Build instructions list x86_64, i686, aarch64, and armhf targets. The current version downloads the latest AppImage runtime, or accepts a local runtime file. Update information can be guessed from GitHub Actions and GitLab CI environment variables. An AppDir is required, and ARCH must be set when binary architecture cannot be determined, such as with multiple architectures or shell scripts. Source code is under the MIT License, subject to stated exceptions and dependency terms.

electron-builder is a free, open-source tool for packaging Electron apps for distribution on Linux, macOS, and Windows. It creates installers, portable builds, and archives, with targets ranging from DMG, PKG, AppImage, and DEB to NSIS, MSI, ZIP, and other formats. Command-line packaging and silent installation are supported. The electron-updater package provides differential updates, staged rollouts, and documented providers including GitHub Releases, Amazon S3, DigitalOcean Spaces, Cloudflare R2, Keygen, and generic HTTP(S) servers. Update manifests may be signed with Ed25519 and checked against a public key embedded in the app. Configured credentials enable macOS notarization and Windows Authenticode signing; ASAR integrity hashes are enabled by default, and Electron Fuses can disable selected features at package time. GitHub Actions guidance covers CI/CD builds and publishing. In v27, publishing must be explicitly requested. One build constraint matters: macOS signing requires macOS, and native dependencies generally need compilation on the target platform unless prebuilt binaries are used.