SunLicenseYour Pro WordPress plugin, licensed per site.
Free on wordpress.org, Pro licensed per site, refunds switched off.
Free plan · No credit card · Set up in minutes
Coding with an AI agent? Paste one prompt- WordPress
- WooCommerce
- PHP
- Envato
- Lemon Squeezy
- Payhip
- Stripe
Built for how you sell.
Site limits that hold
Domain as machine id: 1, 5, 25 sites.
TOO_MANY_MACHINESSell where you like
WooCommerce, Lemon Squeezy, Payhip and Envato.
Buyers move sites
Staging to live, freed in your portal.
Lite & StandardPro downloads, gated
Revoked or expired keys can't download.
StandardSentinel spots shared keys
And refunded licenses still in use.
Lite & StandardPHP SDK, any host
No dependencies: cURL or PHP streams.
PHP 8.0+Live before your next release.
- 1Create a free account
- 2Connect WooCommerce or Envato
- 3Check it in Pro settings
use SunLicense\SunLicenseClient;
function acme_pro_license_ok(): bool {
$cached = get_transient('acme_pro_license');
if ($cached !== false) return $cached === 'ok';
$client = new SunLicenseClient('https://api.sunlicense.com', token: 'slk_...');
$result = $client->validate(get_option('acme_pro_key'), [
'host' => wp_parse_url(home_url(), PHP_URL_HOST), // one site = one activation
]);
set_transient('acme_pro_license', $result->isValid() ? 'ok' : 'no', DAY_IN_SECONDS);
return $result->isValid();
}Questions, answered.
Can a plugin on wordpress.org check a license key?
No. wordpress.org's guidelines ban trialware, so a plugin hosted there can't lock features behind a license key. Keep the free plugin fully working there and sell Pro as a separate add-on plugin through WooCommerce, Lemon Squeezy, Payhip or Envato. Only the Pro add-on checks the key, and its readme should say it connects to SunLicense.
How does a per-site license limit work?
Your Pro add-on sends the site's domain as the machine fingerprint. Each new domain takes a slot on the license, and once all slots are used the check answers TOO_MANY_MACHINES. Buyers free a slot in your customer portal when they move a site, or you free it from the dashboard.
My plugin is GPL. What does a license key protect?
The GPL lets anyone share and modify your code, and a license key doesn't change that. What a key controls is what you provide: downloads of new releases, support, and any service your plugin calls on your servers. Refunded, revoked and over-the-limit keys stop working for all of that.
Does SunLicense deliver plugin updates into wp-admin?
Not by itself: there's no WordPress update server built in. On Standard, buyers download each Pro release from your customer portal, and only active licenses can. If you run your own update checker, it can call the same license check before offering an update.