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The industry standard since 1985. Comprehensive but expensive and anchored to a desktop workflow that requires office visits between field measurements and customer proposals.

Desktop-only Windows software with $800-3,500 training costs

Web-based and ACCA-approved with 150,000+ users. Good Manual J but Manual S is still in Beta, no psychrometric tools, and per-project pricing can add up quickly.

Manual S equipment selection still in Beta — incomplete J/S/D workflow

Comprehensive Manual J/S/D with ACCA approval. Solid calculations but the desktop-first interface feels dated, and you need to buy separate tools for psychrometrics and commercial work.

Desktop-focused with dated interface and fragmented product line