Heurix Search for WooCommerce

Heurix Search intercepts WooCommerce product search and replaces the results
with ones computed by the Heurix engine — without touching your templates, your
faceted filters or your product pages. Only which products come out, and in
what order, changes.

What the plugin does:

• Indexes your published catalog into your Heurix account
• Re-syncs each product when it is saved (price, stock, new product)
• Replaces native search results with Heurix’s, in the relevance order returned
• Steps aside silently — native WooCommerce search, unchanged — when Heurix is
  temporarily unreachable

What the plugin does not do (v0.2.1):

• It does not search variation attributes separately (colour, size): the parent
  product is indexed, not each individual variation

Compatibility: what has actually been run

The headers above carry only versions that have REALLY BEEN RUN. Recorded on
22 September 2026, completed on the 23rd.

ONE OF THOSE LINES IS LESS PRECISE THAN THE MEASUREMENT, AND THE PARSER IS WHY.
Tested up to says 7.1; WordPress 7.1.2 is what ran. Plugin Check 2.1.0 — the
official wordpress.org tool — rejects the third number: “invalid_tested_upto_minor
[…] should only include major versions 7.1”, an ERROR, measured on this plugin
on 23 September 2026. The exact number is on the WordPress line below.

• PHP 8.1.34 and 8.5.10: the tests/ suites, green on both (49 assertions on the
  morning of 22 September, 59 after the two suites added that day). The version
  announced before that day was 7.4, and 7.4 had never been run once.
• WordPress 5.9 to 7.1.2: RUN. 7.1.1 and 7.1.2 on the circuit-breaker bench
  (MariaDB 12.3.3, and SQLite through the SQLite Database Integration plugin
  3.0.2), then 5.9.18, 6.0.16, 6.1.14, 6.3.12, 6.5.12, 6.7.9 and 6.9.9 on
  23 September 2026, each with a WooCommerce that accepts it, inside a real
  product loop. The records carry the version (wordpress.version) and the
  archive verified against its published sha1.
  The lower bound is measured under PHP 8.1, and it is WordPress that sets it,
  not this plugin: 5.8.17 and 5.6.21 do not start under PHP 8.1, because mysqli
  throws by default there and their wp-db.php does not set
  mysqli_report( MYSQLI_REPORT_OFF ). That line appears in WordPress 5.9,
  with the WordPress comment that names PHP 8.1.
  NOT MEASURED: WordPress 5.8 and earlier under a PHP they accept (they go down
  to 5.6.20). That would need a PHP 7.x, ruled out on 23 September — the
  Homebrew formula has been dead since 2022, it would mean a third-party tap and
  one more php-fpm. That gap cannot open on a merchant’s site: WordPress refuses
  to activate a plugin whose Requires PHP is not satisfied, and ours asks for
  8.1.
• WooCommerce 6.1 to 11.1.2: RUN, on 23 September 2026. Thirteen versions played
  inside a real product loop, on WordPress 7.1.2 (tests/banc-disjoncteur,
  crochets scenario). What was checked each time: that WooCommerce sets
  posts_per_page before the plugin reads it, that the Customizer’s
  loop_shop_per_page takes effect, that the order returned by Heurix survives
  the loop, and that page two returns the next slice.
  The lower bound is measured, not chosen: 6.0.0 does not hold
  (loop_shop_per_page has no effect, page 2 comes out empty), 6.1.0 holds. The
  lines “WC requires at least: 7.0” and “WC tested up to: 9.0” announced until
  22 September rested on nothing at all.
  Not measured: the intermediate versions of each branch (the runs cover 4.9.5,
  5.9.2, 6.0.0, 6.1.0, 6.2.0, 6.3.0, 6.5.0, 6.7.0, 6.9.5, 7.0.0, 7.9.2, 8.9.5,
  9.9.7, 10.9.4, 11.1.2), and WooCommerce 3.9.5, which stops on a PHP error
  before reaching the measurement.

What this means for you: on WooCommerce 6.0 or older, Heurix search shows the
first page and returns an empty second one. The plugin does not detect this — it
does not read the WooCommerce version, only whether it is present.

THE TWO BOUNDS GUARD EACH OTHER, AND THAT IS MEASURED. WordPress refuses to
activate a plugin whose Requires at least or Requires PHP is not satisfied —
verified on 23 September 2026, both ways:

"Current WordPress version (6.9.9) does not meet minimum requirements
 [...] The plugin requires WordPress 7.1."
"Current versions of WordPress (6.9.9) and PHP (8.1.34) do not meet
 minimum requirements [...] requires WordPress 7.1 and PHP 9.9."

So “Requires at least: 5.9” is not an idle line. WordPress 5.9 to 6.2 officially
accept PHP 5.6.20, and we have exercised them only under 8.1 — but a site on
PHP 7.x cannot activate this plugin at all, since Requires PHP: 8.1 forbids
it. What we have not measured therefore cannot happen on a merchant’s site.

“Requires PHP: 8.1” IS STILL A PRECAUTIONARY BOUND. 8.1.34 and 8.5.10 are
exercised; nothing below. It is the one holding the whole thing up, and it has
never been taken down.

A THIRD BOUND, DECLARED ON PURPOSE: WooCommerce MUST BE ACTIVE TO ACTIVATE THIS
PLUGIN, on WordPress 6.5 and later. That is the plugin dependency header, added
at the request of the wordpress.org review. Two things it is worth knowing,
measured on 27 September 2026:

• WordPress resolves the dependency by the NAME OF THE INSTALLED FOLDER, not by
  WooCommerce itself. If your WooCommerce lives in a folder that is not called
  woocommerce, WordPress will refuse to activate this plugin even though
  WooCommerce is running and the plugin would work. Rename the folder to
  woocommerce, or install WooCommerce from wordpress.org.
• A plugin that is ALREADY ACTIVE is not deactivated if the dependency stops
  being satisfied. Upgrading to a version carrying this header cannot turn your
  search off.

On WordPress 5.9 to 6.4 the header does nothing at all — it is ignored in
silence, and does not even show on the Plugins screen. There, as before, the
plugin activates without WooCommerce and simply does nothing: it tells you so on
the Plugins screen, and native WooCommerce search is untouched.

Requirements

An active Heurix account, with a server API key (prefix hx_) and a catalog
created. See heurix.fr/docs to get started.

The external service, what it costs, and what it receives

This plugin is an interface to Heurix, a hosted search service
(https://heurix.fr). Ranking, typo tolerance and trade synonyms are computed by
the service; the plugin handles indexing and the replacement of results.

No feature of the plugin is locked, time-limited, or held back for a paid
version. All the code shipped is active from activation onwards, with no
licence key and no subscription check, and the zip contains no dormant code
waiting to be unlocked. What you pay for is the service, not the plugin.

Service pricing, as of 23 September 2026: from EUR 19 excl. VAT per month on
monthly billing, with a 14-day free trial and no credit card required (see
heurix.fr/pricing). The trial is not a
sandbox: it is the full service, and the same API key keeps working unchanged
once you subscribe. No feature appears or disappears at that point.

Terms of Service: https://heurix.fr/en/cgv.html

What is sent to Heurix, and when

Nothing leaves your site until you have entered your API key on the
WooCommerce > Heurix Search settings page. Entering it is what grants consent;
without it the plugin opens no outbound connection at all.

At indexing time (manually, then whenever a published product is saved or
deleted), for each product: its WooCommerce ID, its SKU, its name, its
description, its stock state, its price, its public URL, its brand and its main
category.

On each visitor search: the term typed, the number of results requested and the
pagination offset. Nothing else. The plugin sends no IP address, no visitor
ID, no cookie and no browser header, and it does not read $_SERVER. Every
request leaves from the WordPress server; the visitor’s browser never contacts
Heurix and never sees the API key.

Privacy policy: https://heurix.fr/en/privacy.html

If the service stops responding, native WooCommerce search takes back over
automatically: the shop stays usable without an active subscription.