What Stapel does

The wide widget (4×2) is the card that is ready: its colour, its mark and its barcode, with three tappable chips under it for the cards you used next most recently. Walk into a shop it knows and the code switches to that card, with the shop you are standing in named above it. Zero taps between you and the code. That switch is on by default; off, the card you used most recently stays.

The small widget (4×1) is a single row, edge to edge: the card itself, in its own colour, with the barcode across the full width. Tapping opens that card. Standing nowhere in particular, it is the card you used most recently.

There is no middle setting to pick. Switching it on asks for precise location, for "allow all the time" and for notifications, and without all three the switch does not move. Set Stapel's location in Android to "only while using the app", or to approximate, and that is not a modest variant but a dead end: Play Services geofencing refuses such a grant, so the app says on the screen what is missing rather than switching on something that would never fire.

On, there are two separate switches, both about what happens on arrival rather than about the measuring: whether the shop you are standing in is named above the barcode, and whether the card may appear on the lock screen. That last one is off; what it costs is on the privacy page.

Underneath this is Google Play Services' GeofencingClient with a radius of about 150 metres, re-armed on the nearest stores whenever you move meaningfully. The app still asks Android directly for your position rather than fused location, and Stapel sends it nowhere. What the geofencing itself gets to see is on the privacy page.

On arrival the widget changes, the tile retargets and one notification fires. That notification is probably the most useful part: nobody is looking at their home screen while walking into a shop.

Hundreds of rows, most of them with a card. The Dutch ones are loyalty programmes and memberships that do carry a card, plus a handful of chains that run nothing and are listed precisely so the app does not suggest them. Alongside those are the foreign rows, for Belgium, Germany, Austria, France, Spain, Italy, Portugal, the United Kingdom, Ireland, Poland, the United States, Canada, Denmark, Sweden, Norway, Finland, Iceland, Brazil, Japan, Australia, New Zealand, Mexico and South Africa. Which countries the app also knows the shops for is a separate list, on the store data page. Some cards are honoured at more than one chain; Colruyt Xtra, for instance, at Colruyt, OKay, Bio-Planet, Spar, Dreamland and DATS 24. The catalogue grows most weeks, so this page does not quote a total that would only be right until the next release.

The app ships brand logos for most of the list: a few files also serve a sister chain in another country, Lidl's among them. They come from Wikimedia Commons and are there only to make the card you already hold recognisable; the provenance and licence of each one is in the app under Privacy → Licences. A chain without a logo gets the brand colour and an icon instead. Any chain that would rather not see its logo here only has to ask.

The list updates itself. It ships with the app as a floor, and the app picks up a signed version once a month over the same secured route as the store data: no account, no extra permission, no new server. When a chain renames its programme you do not have to wait for a new version of the app. The Brands screen says when your list was last updated.

Six of the Dutch programmes were renamed in 2025 or 2026. An outdated name or a wrong colour is a real bug: report it.

Your cards, vouchers and folders in one file you put where you like, and a read-back on the new device. No cloud, no account. The file is not encrypted: it is plain JSON, so you can still open it in ten years, and anyone holding it can read your codes. The app says so on the backup screen too.

Android separately does Auto Backup, which puts a copy in your Google account. The app names that and you can switch it off; how is on the privacy page.