Strelka2
4.6
Free Strelka2 is praised for its accuracy and speed in variant calling, but requires computational resources and bioinformatics expertise.
A fast and accurate small variant caller optimized for germline and somatic variation analysis.
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Refined 3/4/2026
About Strelka2
Strelka2 is a small variant caller designed for analyzing germline and somatic variations in DNA sequencing data. It uses a tiered haplotype model for improved accuracy in germline variant calling, adaptively selecting between assembly and alignment-based haplotyping. For somatic variant calling, Strelka2 accounts for potential tumor cell contamination in normal samples. The tool incorporates a mixture-model indel error estimation method to enhance robustness against indel noise. A final variant re-scoring step, utilizing random forest models trained on call quality features, is applied to improve precision. Strelka2 accepts BAM or CRAM files as input and reports variants in VCF 4.1 format, supporting gVCF conventions for germline variant reporting. Integration with Manta structural variant caller is recommended for optimal somatic indel performance.
Core Capabilities
Strelka2 is a small variant caller designed for analyzing germline and somatic variations in DNA sequencing data.
Main Tasks
Haplotype-based Variant Detection
Explore all tools that specialize in haplotype-based variant detection. This domain focus ensures Strelka2 delivers optimized results for this specific requirement.