| Aspect | Official CSI Digital Subscription | Free Excel Download | |--------|-----------------------------------|----------------------| | | 100% correct | 80–95% (varies widely) | | Level 4 numbers | Yes | Rarely complete | | Change log (2018→2020) | Detailed | Often missing or wrong | | Updates | Automatic for errata | Never updated | | Cost | $329 (CSI member) / $470 (non‑member) for 1‑year access | Free or <$50 | | Legality | Licensed | Likely unlicensed |
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If you are a member of a large construction alliance: | Aspect | Official CSI Digital Subscription |
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