Free WordPress plugin

Know before you
upgrade PHP.

CompatNav reads the code of every plugin and theme on your WordPress site and tells you, in plain words, what will break and what will only show deprecation notices on PHP 8.0 to 8.5. It runs on your own server.

Get CompatNav, free Getting started

58 checks
Nothing leaves your site
Reads code, never changes it

The CompatNav report saying “Not ready yet”, with a short “What to do first” list.

Your route

7.4today
8.0
8.1
8.2
8.3
8.4
8.5your choice

Choose where you’re going. CompatNav reports only what changes between the PHP your site runs today and that version. Simplified illustration.

One clear answer

Three signals. No guesswork.

Not every PHP message is an emergency. CompatNav sorts each finding into what will stop your site and what only adds a notice, then gives you one verdict.

Will break

Stops the page

A fatal error on the new PHP version: the plugin or theme stops working. Fix or replace it before you switch.

Deprecation notice

Keeps working

The code still runs; PHP only logs a notice. A cleanup item for a later update, not an urgent fix.

Safe to upgrade

Nothing active will break

“Safe to upgrade to PHP 8.5”, or “Not ready yet” with a short “What to do first” list.

Simplified illustration of the report’s labels; the colours mean the same as in the plugin.

What you get

Everything you need to plan the switch

Checks for PHP 8.0 to 8.5
58 checks for the changes each version brings, from removed functions to new deprecations.
Only what changes for you
It compares your PHP today with the version you choose and reports only the difference.
Next steps you can act on
For each plugin and theme: whether an update exists, each issue in plain words, a before/after example.
Reports to share
A self-contained HTML report that opens in any browser and prints to PDF, and a CSV file.
Built not to hang
Short background steps with a progress bar: pause, resume or cancel. Heavy files are skipped and listed.
Honest about its limits
Files it couldn’t check are listed with the reason, and while one is active the verdict never says “Safe”.

Private by design

Your code never leaves your server.

The scan runs entirely on your own server. CompatNav makes no external requests, and stores only scan results (file paths, line numbers, check IDs), never personal data.

Runs on your server. No code, file names or results are sent anywhere.
Only reads files. It never runs or changes the code it checks, and never applies fixes.
No personal data. Only scan results are stored.

See it before you install it