Semver Comparator & Range Calculator

Parse SemVer 2.0.0 versions, compare two with the full operator set, and match them against npm-style ranges — caret (^1.2.3), tilde (~1.2.3), hyphen (1.2.3 - 2.0.0), x-ranges, OR sets, and the six comparators. Includes a bulk max-satisfying finder and a version bumper. Pure client-side, no upload.

Parse a version

Strict SemVer 2.0.0 — rejects leading zeros, empty parts, missing core, and other spec violations.

Version string

stable rc alpha build

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Compare two versions

Precedence per the spec — a non-pre-release outranks a pre-release at the same M.m.p; build metadata is ignored.

Version A

0.9.0 1.2.3 2.0.0-rc.1

vs

Version B

1.0.0 2.0.0 2.0.0+build.7

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Match a version against a range

npm-style: caret, tilde, hyphen, x-ranges, OR, and the six comparators. The range is parsed and pretty-printed back so you can see what it actually means.

Version

Range

Range presets ^1.0.0 ~1.2.3 1.x 1.2.x >=1.0.0 <2.0.0 1.2.3 - 2.0.0 ^1.0.0 || ^2.0.0 *

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Find the highest version that satisfies a range

Paste one version per line, set a range, see every match and the highest-precedence one. Invalid lines are flagged inline. Blank lines and # comments are ignored.

Versions 0.9.0 1.0.0 1.2.3 1.4.2 2.0.0 2.1.0 3.0.0-beta.1 3.0.0

Range

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Bump a version

npm-compatible bumps. The pre-release id defaults to rc.

Current version Pre-release id

major minor patch premajor preminor prepatch prerelease

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Range syntax cheatsheet

Syntax	Meaning	Example
1.2.3	exact	1.2.3 matches only 1.2.3
>1.2.3 etc.	comparator	>=1.0.0 <2.0.0
^1.2.3	compatible (per npm)	^1.2.3 ⇒ >=1.2.3 <2.0.0
~1.2.3	patch-level (per npm)	~1.2.3 ⇒ >=1.2.3 <1.3.0
1.x / 1.2.x	x-range	1.x ⇒ >=1.0.0 <2.0.0
1.2.3 - 2.0.0	hyphen range	>=1.2.3 <=2.0.0
A || B	OR	^1.0.0 || ^2.0.0
*	any	matches every version

Pure client-side, works offline once loaded, no upload, no tracking. Built on the SemVer 2.0.0 spec and the npm range grammar.