Android app · in testing
Thumb Arc
Reach the whole screen from one corner. A small pad under your thumb with a cursor, two buttons and a scroll ring, for limited reach or grip, or a busy other hand.
01
Move
Slide on the pad to move a cursor anywhere on screen. It snaps onto buttons when it's close.
02
Click and hold
Tap L to click and R to long-press, wherever the cursor is.
03
Turn the ring
Scroll lists, set sliders, move the text cursor and turn pages, like a dial.
No internet permission. Nothing on your screen leaves your phone.
Thumb Arc is in testing before its Google Play launch. Want to try it early? Write to me and I'll add you as a tester. Privacy policy.
Products
More things I build
LightningPDF
LivePDF generation API for HTML, CSS and Markdown.
Go · Redis · S3
ThunderHooks
LiveCapture, inspect and replay webhooks.
Go · templ · per-tenant SQLite
devformat.tools
LiveDeveloper tools that run in the browser, plus an MCP server.
Go · SQLite
Octavo Reader
Public betaEPUB and PDF reader for Obsidian, desktop and mobile.
TypeScript · pdf.js
Tenantree
BetaBack office for Kenyan property managers: M-Pesa reconciliation, owner ledgers, WhatsApp.
Go · HTMX · Turso