JavaScript & TypeScriptV8 vs Istanbul
Use V8 on Node.js or Chromium, and Istanbul where V8 coverage isn't available, such as Firefox. Since Vitest 3.2 both produce the same reports.
Read comparisonCompared
How Supercov
compares
Coverage and security tools side by side: what each finds, what it misses, and when to use something else.
JavaScript & TypeScriptJavaScript & TypeScriptc8 vs nyc
Compare c8 and nyc coverage with the same JavaScript fixture. See how collection, source maps, and coverage criteria affect the result.
Read comparisonJavaScript & TypeScriptVitest vs Jest
Start a new Vite app with Vitest. Keep an established Jest suite unless you have a concrete reason to move. What differs, and what to check first.
Read comparisonJavaScript & TypeScriptPer-test coverage in Vitest
Vitest reports coverage for the whole run, not per test. Supercov runs your Vitest command and shows which tests cover any line, and what each test covers.
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RubySimpleCov vs Supercov
Compare SimpleCov and Supercov for Ruby line, branch, per-test, MC/DC, and assertion coverage, with a concrete missing-test example.
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PythonPython coverage tools
Compare Python coverage tools: coverage.py with pytest-cov, SlipCover, and Supercov. See per-test contexts, MC/DC, and assertion coverage side by side.
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RustRust coverage tools
Branch and MC/DC coverage on stable Rust: cargo-llvm-cov needs nightly for both, Tarpaulin measures lines, and Supercov measures line, branch and MC/DC on stable.
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SecuritySecurity scanners
Supercov, Codex CLI, Claude Code, Kolega, DeepSeek, GLM and Semgrep on 72 vulnerable repositories: how much each finds, how fast, and what it costs.
Read comparisonSecuritySupercov vs Codex CLI
Codex CLI finds more vulnerabilities; Supercov answers in 10 seconds for 5¢. Measured on 72 vulnerable repositories, with results by language.
Read comparisonSecuritySupercov vs Claude Code
Supercov finds more; Claude Code with Sonnet 5 is right more often. Supercov is 17 times faster at a twentieth of the cost, on 72 repositories.
Read comparisonSecuritySupercov vs Kolega
Kolega finds 91% of labelled vulnerabilities; Supercov finds 56% in 10 seconds. Measured on 72 RealVuln repositories, with results by language.
Read comparisonSecuritySupercov vs DeepSeek
DeepSeek agents are cheaper and a little more accurate; Supercov answers in 10 seconds. Measured on 72 vulnerable repositories, by language.
Read comparisonSecuritySupercov vs Semgrep
Semgrep's default rules find 9% of labelled vulnerabilities; Supercov finds 56% for 5¢ a repository. Measured on 72 vulnerable repositories.
Read comparisonCoding agentsQA tools for coding agents
Compare QA tools for coding agents: coverage, mutation testing, browser tests and reporting. See what each adds, what it needs and where it stops.
Read comparisonCoding agentsCodecov vs Supercov
Codecov reports coverage your tools already measured; Supercov measures it, including MC/DC and assertion coverage. Gate pull requests with either, or use both.
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Gogo test -cover, gomcdc, Supercov
MC/DC and branch coverage for Go: go test -cover measures statements, gomcdc adds MC/DC on Go 1.26, and Supercov adds MC/DC, per-test and assertion coverage on 1.22+.
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JavaJava coverage tools
Compare JaCoCo, OpenClover and Supercov for Java: bytecode counters, per-test coverage, MC/DC and assertion coverage, with Maven and Gradle commands.
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KotlinKotlin coverage tools
Compare Kover, JaCoCo and Supercov for Kotlin: Gradle reports and verification, per-test coverage for Kotest and Spock, MC/DC and assertion coverage.
Read comparisonWritten by the Supercov team. Versioned sources, concrete examples, and the trade-offs—not a universal winner.