Anthony Crisp

I build small, careful software.

Mostly Android and the web, usually for a problem I have myself. I like projects with a hard constraint at the centre — no signal, no permissions, no resampling — because the constraint does most of the design work.

Work

blueNOS
ongoingIn progress
An Android music player that controls the whole audio path to a pair of Bluetooth earbuds, not just the part before it leaves the phone.
Play a 44.1 kHz file over Bluetooth and something in the chain almost certainly resamples it, silently, every time. Android pins the A2DP stream to one sample rate when the codec is configured, and with LDAC enabled it defaults to 96 kHz — so every 44.1 kHz file you own is converted on the way out.
Other players can tell you this is happening. What they cannot do is stop it: changing the A2DP codec configuration needs a privileged permission no ordinary app can hold. blueNOS matches the link rate to the source instead, downsampling hi-res by integer decimation and never crossing the 44.1/48 boundary — the one conversion genuinely worth eliminating.
The name is the rule the whole thing is organised around: non-oversampling, over Bluetooth. It is being renamed and will move to a home of its own at antinode-audio.com.
KotlinJetpack ComposeMaterial 3A2DP / LDAC
Boomer Solitaire
2026Released
A calm, dignified Klondike for Android. No ads, no accounts, no tracking, no internet — provably.
The manifest declares no permissions at all, so the app is structurally incapable of phoning home. That is the feature: not a promise in a privacy policy, something you can verify.
Every deal is winnable unless you ask for otherwise — a built-in solver proves a winning line exists before the deal is offered. Unlimited undo with no penalty, hints that prefer uncovering hidden cards, and a continuous auto-save that survives process death, rotation or a week away.
KotlinJetpack ComposeRoom
Tree Tracker
ongoingIn progress
Catalogue and map a rare oak collection — a field app for recording specimens, and a website for browsing, filtering and exporting them.
Built for one collection in particular: several hundred Quercus on an estate in Norfolk, catalogued outdoors and often with no mobile signal. That constraint shapes everything — recording has to work standing in a field with no bars, and reconcile later.
A shared core package holds the domain types, document mapping, filtering and geo that both clients agree on, written against the shape the data takes rather than against either Firebase SDK, because the phone and the website use different ones.
TypeScriptReact NativeExpoNext.jsFirebase
PawSafe
2026Paused
Community reporting for broken glass, with a map and proximity alerts — so a walk can avoid what someone else already found.
Report a hazard with a photo and a pin; everyone nearby sees it on a map and gets an alert on approach. Hazards clear by consensus rather than by decree — three confirmations to mark one gone, a cooldown per device, and a hysteresis buffer on the geofence so an alert does not flicker while you stand next to it.
Paused in 2026 and deliberately left inert: the database emptied and closed, sign-in disabled, and hosting switched to a static holding page that says so. Taking something down carefully is its own piece of work.
FirebaseGoogle MapsService Workers
- paw-safe.uk

Work

blueNOS

Boomer Solitaire

Tree Tracker

PawSafe