Amazon / Sports / BIAO-ZHI SELBSTBEHAUPTUNG DURCH VERTEIDIGUNG E.V.
REVIEW
A Wing Chun club from Lünen built its own app, and that's the whole story.
Biao-Zhi e.V. ships a Fire-tablet companion for its members — calendar, media library, shop, contact form. It's the niche of niches, and it works for exactly the people it's built for.
BY THE APP COMRADE DESK · MAY 11, 2026 · 3 MIN READ
Biao-Zhi Selbstbehauptung durch Verteidigung e.V.
BIAO-ZHI SELBSTBEHAUPTUNG DURCH VERTEIDIGUNG E.V.
OUR SCORE
6.4
AMAZON
★ 5.0
PRICE
Free
Most Amazon Appstore listings under the Sports category are fitness trackers, fantasy-league apps, or live-score services aimed at millions of users. Biao-Zhi Selbstbehauptung durch Verteidigung e.V. is none of those. It is the Fire-tablet companion for a single Wing Chun Kung Fu association in Lünen, a town of around 86,000 people in North Rhine-Westphalia, built so the dojo’s members can pull up the week’s training schedule and the latest instructional video without leaving the couch.
It is the kind of app that exists for forty people in one town, and that is not nothing. Plenty of small clubs never bother — they live on WhatsApp groups and a half-broken homepage. This one shipped a native build, in German, with a calendar, a media library, a shop, and a contact form. The whole product is exactly that, no more.
There is no review to write about competing self-defence apps here, because the comparison set is empty. Either you train at this dojo and the app is part of your week, or you don’t and it is a curiosity. Both readings are correct. The score reflects the second one — most readers — but the first one is the audience the developer was building for.
It is the kind of app that exists for forty people in one town, and that is not nothing.
FEATURES
Biao-Zhi Selbstbehauptung durch Verteidigung e.V. is the official Fire-tablet app for a Wing Chun Kung Fu association in Lünen, North Rhine-Westphalia — a registered German nonprofit (e.V.) teaching self-defence to its members. The app collects four club functions in one shell: a media library for training videos, a calendar of class times and seminars, a small shop for branded apparel and equipment, and a contact form into the dojo office.
There is no login wall on the storefront, so prospective members can browse the schedule and the shop before joining. Existing members get the same content in the same layout — no premium tier, no in-app purchases gating the videos. The app is free, ad-free, and built specifically to keep regulars connected to the dojo between sessions.
MISSION ACCOMPLISHED
The honest case for an app like this is that it exists at all. A regional martial-arts club shipping its own native Fire-tablet build, in German, with working calendar and media features, beats the alternative — a half-broken WordPress site, a Facebook group, a WhatsApp thread. Members opening their tablet in the morning see the week's classes and any video the Sifu uploaded after Tuesday's session. That's the entire job.
The four functions are correctly chosen. Calendar plus videos plus shop plus contact is what a sports-club app needs and nothing more. No gamification, no streaks, no social feed — just the things a member actually opens the app to do.
ROOM TO IMPROVE
Only members of this one dojo in Lünen will get value here. Anyone outside that catchment is downloading a contact form for a stranger. The app does not teach Wing Chun, does not stream classes for non-members, does not function as a general self-defence reference. The Amazon listing makes none of this immediately obvious — the title reads like a generic self-defence app and the screenshots show a media grid without context.
The app also hasn't been updated in over a year as of this review, which for a club-app is forgivable but still tells you the developer is the association's webmaster rather than a full-time team. Calendar entries depend on someone at the dojo keeping them current; if they don't, the most useful feature goes stale fast.
CONCLUSION
This is the niche of niches — an Amazon Fire app for one specific Wing Chun school in one specific German town. For members of Biao-Zhi e.V. it is genuinely useful and worth the install. For everyone else, it is a curiosity. The right kind of curiosity, though: proof that even small associations can ship a functional native app when they care enough to try.