音叉 onsa
A chromatic and instrument tuner for an E Ink phone. Black on white, no color anywhere, and the screen stays awake while you play.
Built for the Mudita Kompakt, whose 4.3" panel has sixteen grays, a slow redraw, and is read at arm's length on a music stand.
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Michael Moessner's Tuner, re-clothed for E Ink. It is a serious instrument: chromatic and per-instrument tuning, a pitch history plot, a cents readout, stretch tuning, and a temperament editor that goes well past equal temperament — just intonation, meantone, Werckmeister, Kirnberger, and any custom scale you care to enter.
None of that is mine. What is mine is what it looks like and how it behaves on this screen.
One appearance. Light, dark, black-night and dynamic color are gone. The panel has one appearance — dark marks on a light ground, in daylight — and a theme setting the hardware cannot honor is a setting that lies. The Appearance row is gone from settings with it.
In tune is not green. Upstream says in-tune and out-of-tune in green and red. On sixteen grays those arrive as two near-identical mid-tones, so an app leaning on them says nothing and says it confidently. Both are black here, and the reading is carried by where the needle sits against the center line — which is how a mechanical tuner did it before anyone had a color display.
The screen stays on by default. Upstream makes this a setting and defaults it off; it is still a setting, and it now starts on. A tuner sits on a music stand and is glanced at between phrases, and you cannot put down a bow to wake a phone.
No icons on settings rows. On this panel a small glyph beside every row costs a column of width and renders as a smudge. The label is the thing.
MMD lists. The scrolling lists use MMD's, which step rather than glide — a fling on E Ink is a smear.
Larger plot type. Upstream's 14sp is sized for a phone in the hand. This is read from a music stand.
Names that fit. The temperament list gave every row the same circled letter and then had no width left for its title, so six rows read "Equal temperame…" and were told apart only by the line beneath. The badge column is gone there and the titles have two lines. The instrument list keeps its drawings, because a guitar and a violin are told apart by them.
./gradlew assembleRelease
A release is signed by a keystore in signing/, which is not in this repository. Without
it the release APK builds unsigned and will not install anywhere — there is no fallback
key by design.
After Tuner by Michael Moessner. The pitch detection, the temperaments, the note naming and the instrument definitions (all but the banjo) are his, unchanged — that is the substance of the app, and roughly ten thousand lines of it.
The 5-string banjo and its eleven tunings come from carefulcarpenter on the Mudita forum (heavencanthandle on GitHub), who added them in a fork of this app. They sit in the instrument list beside the guitar and the basses, one row a tuning, short fifth string first.
The interface was already Jetpack Compose, so this is a re-clothing rather than a rebuild: the theme is MMD, Mudita's E Ink component library.
Download https://github.com/wanderwildwood/onsa/releases/latest/download/onsa.apk
and sideload it. That address always points at the newest release, and every release
publishes a .sha256 beside the APK if you would rather check than trust.
For updates without doing this by hand, add this repository to Obtainium:
https://github.com/wanderwildwood/onsa
GNU General Public License v3.0 or later. See LICENSE.
Note that this is or later, not the GPL-3.0-only these apps otherwise use. The work it derives from was published under "version 3 of the License, or (at your option) any later version", and that option was granted to everyone downstream. It is not mine to take away.
Copyright © wander wildwood, and © 2024 Michael Moessner for the parts that are his.