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Maurice
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CARTO started stamping "API KEY REQUIRED" across every keyless basemap tile on 26.08.2026. #2060 added a key field as the immediate answer, but it leaves a self-hosted instance needing an email exchange with CARTO before its maps look right, and every default in the client still pointed at CARTO. Default to OpenFreeMap Positron instead: no key, no account, no request limit, commercial use allowed, attribution required. OpenFreeMap serves vector tiles only, so the Leaflet basemap is a MapLibre style document rather than an XYZ template. maplibre-gl-leaflet hangs a GL canvas into Leaflet's own tile pane, which leaves everything above it alone - markers, GeoJSON, clusters, plugin layers, the custom panes, and the click handling, since Leaflet's CSS already puts pointer-events:none on that layer. maplibre-gl still arrives only through a dynamic import, so no chunk that draws a map grows by a megabyte. Switched: the trip planner, the MapView fallback every preview goes through, the journey map, collections, the atlas, the shared trip page and the offline tile prefetch. OpenFreeMap Positron and Bright join the tile presets in settings, the admin defaults and both mobile screens. A CARTO template that is already saved keeps working when a key backs it - that stays a supported choice. Without a key it is not drawn at all: resolveTileUrl falls back to the default rather than to a watermark, so an instance that upgrades with one in its settings sees the new basemap immediately and needs no migration. The stored value is left as it is, so the Map settings tab still shows what was chosen and the warning underneath it explains why - one sentence appended, in all 23 locales. OpenFreeMap asks for a credit of its own; OpenStreetMap alone under its tiles is wrong and a licence problem. attributionForTile() derives it from the URL rather than from a flag at each call site, and the shared trip map, which carried no attribution at all, now gets one. Offline maps keep working and get cheaper. A vector style is four things instead of one, so sync/glPrefetcher.ts walks the style document, its sprite, the Latin glyph ranges of each font stack it uses, the TileJSON - the planet path is versioned, so guessing it answers 200 with an empty body - and then the .pbf tiles. Over the Berlin bounding box TREK computes, raster z10-16 is 2237 requests and 34.6 MB and gives up above z16; vector z10-14 is 177 requests and 32.1 MB and stays sharp above that, because MapLibre scales the z14 tile rather than asking for another. The Workbox rule for tiles.openfreemap.org moves to CacheFirst and shares the prefetcher's cache, so browsing tops a downloaded region up instead of filling a second copy beside it - a versioned tile path can never be stale. Clearing offline maps clears it too. The atlas loses its second raster layer. It existed to warm the HTTP cache of neighbouring zoom levels, which a vector basemap does not need; a second one would only cost a second WebGL context. OpenFreeMap has no label-free style, so its labels are switched off on the live map instead - they are all symbol layers, while borders and coastlines are line and fill - re-armed on style.load so a theme switch keeps them off. Theme changes call setStyle in place rather than rebuilding the layer: a swap per toggle would leak a WebGL context, and browsers cap those in the low teens.