CartEngine builds focused, one-time-purchase WooCommerce plugins — Stock Alert Pro and BadgePro — with no subscriptions and no bloat.
Category
Ecommerce
Pricing
One-time purchase for each plugin (no subscription): Stock Alert Pro is $49 early-access and WooCommerce BadgePro is $29 early-access, both including future updates and sold via instant Gumroad download.
CartEngine is an independent WooCommerce plugin studio that builds focused, single-purpose extensions for WordPress stores. Rather than bundling many features into one subscription-based suite, the company sells standalone plugins as one-time purchases: Stock Alert Pro adds back-in-stock email notifications with a FIFO waitlist queue and demand analytics, while WooCommerce BadgePro adds rule-based product badges (sale, new, hot, low-stock) with a custom style designer. Both plugins target WooCommerce 7.0+/WordPress 6.0+ stores on PHP 8.0+, and are built for compatibility with modern block themes as well as popular classic themes such as Storefront, Astra, OceanWP, Kadence and GeneratePress. CartEngine positions itself against bloated, tracking-heavy plugin suites, emphasizing predictable behavior, no subscriptions and no tracking. The company is run as an independent/solo operation rather than a large vendor.
Key Features
Back-in-stock notifications — Stock Alert Pro shows an AJAX subscription form on out-of-stock WooCommerce products and emails customers automatically once inventory is replenished.
FIFO stock-limited queue — Notifications respect available stock, only alerting the number of subscribers that can actually purchase the restocked quantity.
Demand analytics dashboard — Tracks which out-of-stock products have the most subscriber demand and measures conversion/revenue generated from back-in-stock emails.
Custom badge style designer — Lets merchants set badge colors, gradients, shapes, font sizes and positioning, with six pre-built templates and five placement options on the product image.
GDPR-compliant opt-in — Stock Alert Pro uses double opt-in subscription and one-click unsubscribe to keep back-in-stock notifications GDPR-compliant.
Pros & Cons
Pros
One-time purchase pricing for both plugins — no recurring subscription fees
Narrowly-focused plugins designed to do one job well, reducing plugin bloat and conflicts
Stock Alert Pro includes GDPR-compliant double opt-in and one-click unsubscribe
Broad theme compatibility, including modern WooCommerce block themes and popular classic themes
Cons
Small two-product catalog compared to larger WooCommerce plugin suites
No pricing shown on the homepage — prices are only listed on individual product pages
Run as an independent/solo operation, which may limit support capacity and release cadence
BadgePro's early-access version still lacks advanced AND/OR rule chains and bulk badge assignment