On a custom or headless stack, start with how each tool reaches your catalog, cart and checkout, since that sets how much integration work the app needs.
Tools that build from your website don't need a commerce API. Twinr and WebtoNative wrap your live site in a WebView with native navigation and push, and AppMySite offers an advanced web view for any site. MobiLoud also builds on your existing site, and its team adds the native layer and maintains the app.
Native platforms connect to your backend through an API layer. Poq describes an API-first architecture, with its SynApps layer linking loyalty, search and CRM services. Shopgate's Unified Commerce API separates the app from the shop backend, and JMango360, Reskyt and Unbound Commerce integrate with custom backends as part of their managed builds.
Decide how much of the work you hand over. MobiLoud, Reskyt, JMango360, Poq and Unbound Commerce build the app for you. AppMySite, WebtoNative and Twinr are self-serve, and Shopgate pairs a turnkey app with an SDK, CLI and sandbox for your own developers.
Check how the price scales with traffic. Twinr and Shopgate meter app sessions above each plan's allowance, and MobiLoud meters monthly active users. Twinr starts at $25 a month and Reskyt at $450, while JMango360, Poq and Unbound Commerce price on request.