gzl.dev/blog
field notes, mostly
18 posts
August 27, 2026
7 min
Nine ways to say yes
I taught a Light Phone to speak an Oura ring's protocol over BLE. Then I spent a week failing to tap a button that doesn't exist.
Light PhoneBrightOuraBluetoothAndroid
August 21, 2026
6 min
Field notes on LightOS
What the Light Phone III's OS actually is underneath: Android with the Google removed, hardware that talks in key events, and conventions nobody voted on.
Light PhoneLightOSAndroid
August 21, 2026
1 min
A tape recorder, not a voice recorder
BrightRecorder: clips named for where and when, tapes that are just folders of WAVs, and the wheel finally doing the job it was born for.
Light PhoneBrightRecorder
August 18, 2026
2 min
Why I put an app store on a phone designed to have none
Yes, I see the irony. The argument for building it, why there's no server behind it, and the afternoon I accidentally dropped everyone's apps from the index.
Light PhoneBrightMarket
August 14, 2026
2 min
A good fork says thank you
A lot of what I ship is other people's work with my name nearer the top than it deserves. Some rules I try to fork by.
Light Phoneopen source
August 11, 2026
2 min
My bug reports file themselves
Shake the phone three times and the app files its own GitHub issue. Then an AI triages the queue every hour — under strict instructions that guessing is worse than waiting.
Light PhoneAItooling
August 8, 2026
2 min
Fifteen copies of the same file
The least interesting code I maintain is the code I'd save first in a fire. On finally building the shared library.
Light PhoneKotlin
August 8, 2026
2 min
BrightMarket is out
The app store ships: browse on a desktop, install by QR, track updates on the phone, and get your own app into the catalog.
Light PhoneBrightMarket
August 7, 2026
2 min
One column of scores
Twenty-two leagues from four keyless public APIs, in one grayscale column. How BrightSports gets scores with no account and no push.
Light PhoneBrightSports
August 6, 2026
3 min
The MetroCard inside my phone
I dissolved a transit card in acetone and moved its nervous system into the battery compartment. Tap-to-pay is back, sort of.
Light PhonehardwareNFC
August 6, 2026
2 min
Every button does what you tell it to
The follow-up to the keylayout post: BrightControl itself, why the defaults took longer than the code, and the trust problem with accessibility services.
Light PhoneBrightControldesign
August 5, 2026
1 min
Roll is out
The camera app ships: a filter wheel on real hardware, purikura with four-shot strips, date backs, and a privacy lesson from launch day.
Light PhoneRoll
August 4, 2026
2 min
The keylayout file Light left behind
The scroll wheel is just key events. Everything I learned reading Generic.kl off the phone, and the accessibility service that became BrightControl.
Light PhoneAndroid
August 2, 2026
3 min
Rewriting the camera
Roll's whole design is one gesture, stolen from a contact sheet. Plus the filters that got away from me — purikura on a monochrome phone, and datamoshing experiments that mostly produce mud.
Light Phonedesign
July 29, 2026
1 min
A QR scanner, and its desktop twin
The modern world hands you addresses as QR codes and the Light Phone couldn't read them. A scanner for the phone, a generator page for every other screen.
Light PhoneLightQR
March 22, 2026
1 min
BasilNet, a year later
What broke, what I'd trim, and how the media server quietly became infrastructure for everything else I build.
Dockerhomelabself-hosting
March 8, 2026
1 min
I built a bad DSLR on purpose
It took worse pictures than my phone. It's one of the most useful things I've ever built.
hardwarephotography
January 10, 2025
1 min
Building BasilNet: My Home Server Stack
How I built a 15-service media server with Docker Compose, Gluetun VPN, and Home Assistant integrations.
Dockerhomelabself-hosting
← all posts
August 5, 2026 · 1 min

Roll is out

Light PhoneRoll

Roll shipped yesterday. I wrote about the design a few days ago — the pull-down contact sheet, why it’s a rewrite — so this is the other half: what’s actually in the launch build, as posted to the community.

The headline feature is the wheel. The brightness wheel maps to a filter wheel, so changing looks is a physical gesture — you turn a dial on the side of a camera, the way it should be. The filters it turns through got out of hand in the best way: a Game Boy look, dithering, halftone, the old OS X Photo Booth effects, film emulations with baked-on date stamps in three styles, and purikura — the Japanese photo booth look, with dozens of settings including four-shot strips like the real booths print.

The rest of the launch list, quickly: QR reading built into the viewfinder. Favorites. A level, for people who can’t hang a photo straight (me). Shutter and focus sounds. A simple mode for quick shots. Noticeably faster capture and display than stock — the phone’s camera finally feels snappy. If you use my iMessage app, photos send straight from the roll. And shake-to-report, like everything I ship, so when it breaks on your unit I actually find out.

Two apps of mine make it better together: BrightControl can bind the hardware camera button to Roll, so the physical button opens it like a default camera should.

One launch-day lesson that had nothing to do with code: within hours, a commenter looked at my sample photo and identified not just the neighborhood but the floor I took it from. New York window views are fingerprints. Consider which windows you post.

It’s free and open source, like everything else: github.com/gi-os/LightCamera. Tell me what it needs. The best ideas in this app already came from other people, and I expect that to continue.