Capture the property. Publish from the kerb.
Casement is a native iPhone and Android app for listing agents. You walk a property, capture it room by room, dictate the notes that become the listing copy, and publish a draft before you leave the kerb — then run showings, geofenced open-house check-in and buyer leads out of the same app. It is built for the agent working alone in an empty house with one hand on a phone, not for a desk.
A BuildspaceLabs reference build. We designed Casement in-house to show how we approach native mobile — it is not a client engagement, and every name, record and figure inside these screens is fictional demo data.
Casement is designed twice — once in the iOS idiom and once in Material 3 — on top of a shared domain core, rather than one layout wrapped twice for both stores. The frameworks below are the stack each side is specced against.
3 surfaces from the build — 2 in the iOS idiom and 1 redesigned in Material 3 on Android. Everything inside the frames is fictional demo data.
The 7am screen: hero capture card for the half-finished draft at 12 Alder Row, an overnight buyer lead, a "needs finishing" carousel of three drafts with progress rings, and the day's showings as a grouped inset list with a drive-time chip, a swiped row showing the Confirm / Reschedule / Navigate actions, the running Live Activity, and a three-tile stat strip.
The screen the agent stands in the room with: full-bleed viewfinder over the staged primary bedroom, horizon guide reading level, room progress rail, LiDAR measure overlay, capture cluster, and the dictation sheet at its medium detent carrying the live transcript, the draft listing copy, extracted feature chips and the upload queue.
The same day, the same records and the same numbers as the iOS home screen, expressed in Android idioms: top app bar and supporting text, filled and elevated cards, outlined draft cards with linear progress, primary tabs, list items with leading time badges and trailing assist chips, tonal swipe actions, an extended FAB for capture, a snackbar for the pending uploads and a navigation bar with a pill indicator.
The case for building this twice rather than wrapping a web app. Each one is designed around an operating-system capability a browser either cannot reach or cannot be trusted to hold.
AVFoundation and CameraX drive per-room presets, HDR bracketing and 4K60 walkthrough video, with a live horizon guide fed by CoreMotion / SensorManager so every room shot lands square to the wall. The web camera API gives you a frame grab and nothing else.
ARKit RoomPlan on LiDAR iPhones and ARCore Depth on Android measure the room where the agent is standing (4.2 m × 3.6 m, 15.1 m²) and assemble a floor-plan scaffold. There is no browser equivalent to the depth sensor.
SFSpeechRecognizer and Android SpeechRecognizer keep transcribing in a basement or a stone-walled cottage; the dictated note turns into draft listing copy on-device, offline.
URLSession background transfer and WorkManager with a foreground service push a capture set up over hours, honouring a Wi-Fi-only policy, a cellular budget cap and battery-aware scheduling. A backgrounded browser tab is suspended and loses the transfer.
CoreLocation region monitoring and the Android Geofencing API wake the app on arrival and open visitor check-in, with NFC tap and QR badge fallback and a signed on-device visitor log.
Time-sensitive APNs and high-priority FCM land a buyer lead through a Focus mode; an iOS Live Activity in the Dynamic Island and an Android ongoing notification hold the running showing timer; EventKit and CalendarProvider sync showings both ways into the agent's own calendar.
The target architecture this build is specced against, chosen per constraint rather than per habit — the stack shifts with the problem.
Casement is a reference build, so there is nothing to buy on this page. If your team has a problem that needs this kind of depth — offline for a full shift, real sensors, work that has to happen with the screen off — tell us about it and we will tell you honestly whether we are the right people to build it.