A core commerce platform looks like a bargain. The base subscription is approachable, the onboarding is smooth, and you're selling in an afternoon. Then reality arrives in the form of the app store. You need reviews — there's an app. Email — an app. Loyalty, subscriptions, upsells, advanced reports, a better search bar — apps, all of them, each with its own monthly fee. Ten apps later your real bill is double the platform's, and it's the app tax nobody warned you about because the platform's marketing only ever showed you the base.
The app store is a stack in disguise.
Here's the thing the app store quietly does: it recreates the exact unbundled-stack problem inside one ecosystem. Each app is a separate vendor, with a separate subscription, a separate data model, a separate support team, and a separate place it can break. You didn't escape running a stack of tools — you just moved the stack inside a marketplace and gave it a unified-looking login. The reviews app and the loyalty app know nothing about each other, same as any two standalone tools.
The app store didn't replace your stack. It rebuilt it, charged you per app, and called it an ecosystem.
The two hidden costs.
The aggregate bill. Ten apps at $15–$50 each is $300–$500 a month on top of the platform — often more than the platform itself — spread across a dozen invoices nobody reconciles, which is exactly why nobody notices the total.
Die Integrationssteuer. Because the apps don't share a data model, your customer exists in the platform, the email app, the loyalty app, and the reviews app — four times, never quite in sync. The same fragmentation, duplication, and reconciliation you'd have with standalone tools, now inside one storefront.
What “included” should mean.
The alternative to an app tax is a platform where the apps aren't apps — they're modules on one data layer, included in the price, sharing one customer record. Reviews, email, loyalty, subscriptions, POS: not ten vendors you assemble and reconcile, but capabilities of one system that already agree with each other. “Included” should mean included, not “available in the marketplace for an additional monthly fee.”
App stores are great for the long tail of genuinely niche needs. They're a bad way to buy the things every store needs — email, reviews, loyalty, POS — because those shouldn't be ten separate vendors taxing you per app. When the platform is the cheap part of your bill, the app tax is the rest, and it's worth seeing the whole number.