Buylib's free plan has no monthly fee — you pay a commission only when you make a sale. Paid plans exist if you'd rather trade a flat fee for a lower commission at higher volume.
Sell downloads, courses, physical goods, coaching, and subscriptions from the same store — not just a physical-product catalog.
Your store can also appear in Buylib's shared marketplace, giving you a discovery channel beyond your own marketing.
Shopify has a much larger app ecosystem and is built to scale to very large physical-product retailers with complex logistics needs. If that's your situation, it may still be the right tool. Buylib is built for independent creators and small sellers who want a simple way to sell digital products, physical goods, services, and subscriptions from one store, starting with zero upfront cost.