Summary: Migration anxiety is usually about whether your plugins will work. This article explains what the analyser measures, what the fit score means, and why publishing the gaps is better than discovering them after a move.
What the analyser does
The analyser parses a plugin or theme and compares the WordPress functions, classes, constants and hooks it uses against what the platform actually supports. A missing symbol is a gap only if standard WordPress provides it and wp³ does not.
The result is a fit score and, more usefully, the exact list of missing functions.
Reading the scores
Current analysis puts WooCommerce at 0.70, UpdraftPlus at 0.75, Elementor at 0.85 and WordPress SEO at 0.88. A higher score means fewer missing symbols, but the missing ones matter more than the number.
A score of 0.88 with only cosmetic gaps is a very different situation from 0.70 with a missing checkout function. Read the list, not just the percentage.
Why we publish the gaps
A compatibility tool that only reports success is useless. Publishing the missing functions lets you judge the risk yourself and lets us prioritise the work that matters most to real sites.