Focused on developers or other technically-minded ecommerce store creators. Seems to have an enterprise focus based on the customers they highlight (Staples, for example). They also develop lots of Shopify plugins, making this comparison a bit complicated. Most of the info below focuses on WooCommerce.

Pricing info:

Bold Checkout Pricing & Overview

You can use Bold Checkout on its own or with WooCommerce:

WooCommerce Integrated Bold Checkout Overview

API info:

Bold Commerce Developer Docs | Bold Commerce Developer Docs

You’ll need Bold Subscriptions (an additional $49.99 / month) if you want to offer subscriptions with Bold Checkout:

Bold Subscriptions Overview

Zapier info:

Bold Commerce Integrations | Connect Your Apps with Zapier

Note that whether or not you can accept Apple Pay, Google Pay, and PayPal ultimately depends on the payment gateway you use. Bold is not a payment gateway in itself, hence the separate CC fees. More info on supported payment gateways here:

Connect a Payment Processor to Bold Checkout