Show HN: MST – Free BOM and drawing-check tools for equipment engineers

Check P&ID tags. Compare BOM revisions. Review drawing data.

LINE LIST + REVIEWED P&ID RECORDS → DISCREPANCIESLine List Check ↗

Compare a line list with reviewed P&ID records. Find missing line numbers, duplicate identities and differences in endpoints, size, piping class or service. Review and export CSV.

REQUIRED FILES + LOCAL FOLDER → HANDOFF REVIEWDelivery Package Check ↗

Check a drawing delivery manifest against selected local files. Find missing PDFs or STEP files, empty files and ambiguous names. Review and export findings without uploading documents.

P&ID TAGS + FROM/TO CSV → REVIEW LISTConnection Table Check ↗

Compare a connection table with reviewed P&ID tags and optional BOM assignments. Find missing endpoints, repeated pairs and unmapped tags. Export source-record findings.

PRINTED TAGS → LIST COMPARISONP&ID Tag Check ↗

Read and review tag text, then compare it with your equipment or instrument list. Export unmatched tags.

REVISION A → REVISION BBOM Compare ↗

Compare two BOM CSV files by part number. Find added or removed parts and quantity, description or material changes. Free, no file upload.

BOM + MODEL INDEX → HANDOFF REVIEWBOM–Model Check ↗

Match a BOM to model filenames and declared revisions. Find missing mappings, conflicting versions and files absent from your selection. Export a review list.

DRAWING → SPREADSHEETDrawing to BOM ↗

Read an existing parts table from a PNG, JPEG or PDF. Review the rows and export Excel or CSV.

EXPORTED DATA → REVIEWED BOMBOM Check ↗

Check a BOM CSV for duplicate part numbers, missing quantities and conflicting fields. Review and export every column locally. Free, no sign-in.

DRAWING SHEETS → REGISTERTitle Block Reader ↗

Read drawing numbers, titles and revisions. Check each sheet and export a drawing register.

DRAWING SET A → DRAWING SET BDrawing Register Compare ↗

Find added, removed and changed drawing sheets by drawing number and sheet. Compare revision labels and export a review list.

These existing DrawingDiff services have separate processing and usage terms.

Use these tools here, or inspect and adapt the MIT-licensed source on GitHub. Examples use synthetic engineering data. Suggestions for a useful mechanical design tool are welcome in the repository.