How to use the Semver Range Checker
Single: enter a version and a semver range — green means the version satisfies the range.
Batch: enter multiple versions (one per line) to see which ones satisfy the range.
What is it?
Semantic Versioning (SemVer) is the standard for version numbers: MAJOR.MINOR.PATCH. Range specifiers define which versions are acceptable: ^ (caret) allows compatible changes (same major), ~ (tilde) allows patch changes only, and explicit operators (>=, <, =) give precise control.
SemVer ranges appear in package.json, Cargo.toml, Go modules, and many CI/CD configurations to control which dependency versions are acceptable.
Benefits
Production-ready configs from the first commit
Generated Dockerfiles, docker-compose.yml, and Kubernetes manifests follow established best practices — multi-stage builds, non-root users, health checks — out of the box.
Eliminate scheduling and configuration bugs
Visual cron builders show exact next fire times; validated .env files enforce correct key-value formatting — catch errors before they cause silent failures in production.
Keep secrets and artefacts out of version control
Complete .gitignore files for every language and framework prevent API keys, .env files, build directories, and IDE settings from ever reaching a remote repository.
Faster container builds and CI/CD pipelines
Correctly ordered Dockerfile layers cache dependencies aggressively — a package.json-first copy order turns multi-minute builds into seconds on unchanged dependencies.
Frequently asked questions
What does ^ (caret) mean?
^1.2.3 means >=1.2.3 <2.0.0 — any version that doesn't break the public API. It's the npm default when you install a package.
What does ~ (tilde) mean?
~1.2.3 means >=1.2.3 <1.3.0 — only patch updates. More conservative than caret.
What is a pre-release version?
Versions like 1.0.0-beta.1 or 2.0.0-rc.2 are pre-releases. They are excluded from ranges by default unless explicitly included or the range uses -prerelease tags.