covsnap computes per-target and per-exon depth metrics from BAM/CRAM files, producing an interactive HTML report with PASS/FAIL classifications and visual coverage summaries. Includes a cross-platform graphical interface (Tkinter) and supports gene symbols (single or comma-separated), genomic regions, and BED files as input. Ships with a bundled GENCODE v44 hg38 gene index — no internet or GTF files required at runtime.