v0.2.1-beta — GPU usage, split temperatures, app search & clearer frame-time

JankMark v0.2.1-beta

A zero-overlay Android performance profiler — read live FPS, frame-time, and
hardware telemetry from your phone over ADB on a clean PC dashboard.

Beta: stable for everyday use, but still gathering feedback. Please file
anything odd under Issues (logs are at Help ▸ Open Log Folder).

✨ Highlights

• Find your game fast — type-to-search the app list, or hit Detect to
  auto-select whatever's currently open on your phone.
• GPU usage on more devices — reads GPU usage without root on more phones;
  where a device blocks a stat, the chart now explains why instead of going blank.
• Per-sensor temperatures — separate CPU / GPU / battery lines; click the °C
  gauge to cycle Max → CPU → GPU → Battery, and hovering names each line.
• Frame time that matches what you see — real on-screen frame interval
  (120 FPS ≈ 8.3 ms, 60 FPS ≈ 16.7 ms) with an Even / Fractional / Uneven
  cadence indicator, and a built-in "?" explaining why a phone's frame time
  naturally steps up and down (it's vsync, not stutter).
• Readable charts — auto-scaling that ignores one-off spikes, plus pan +
  zoom on the report timeline so long sessions stay legible.
• Power, battery, voltage & current live charts, a session library
  (auto-saved, reopenable with full charts), PNG report export, and a
  "?" badge on every metric explaining what it means.

See the full CHANGELOG for everything new since 0.2.0-beta.

📥 Install

1. Download JankMark_Setup_v0.2.1-beta.exe below.
2. Windows SmartScreen may warn because the build isn't code-signed yet — click
   More info → Run anyway. (Signing is on the roadmap.)
3. Run it. ADB is bundled — no separate setup. On your phone, enable
   Developer Options → USB debugging, connect over USB, and accept the
   authorization prompt.

Requirements: Windows 10/11 · a USB cable · an Android device with USB debugging.

⚠️ Known limitations

• GPU usage is unavailable on some chipsets (e.g. Mali / Pixel) due to vendor
  policy — GPU clock speed still reads, and the app shows a short note explaining
  the gap.
• Connect over USB first. Wi-Fi works once paired, but full Wi-Fi pairing for
  Android 13+ is still being finished — USB is the reliable path for now.
• FPS may not resume after backgrounding the game. If you send the game to the
  background mid-session and return, the FPS meter can stay paused until you stop and
  restart the session. Known issue, fix coming in v0.2.2.

🙏 Feedback

This release was shaped almost entirely by beta-tester reports — thank you. Found a
bug or want a feature? Open an Issue.

v0.2.0-beta — First public beta

[0.2.0-beta] — 2026-06-21

First public beta release.

Added

• Session library — every completed session is auto-saved to
  %USERPROFILE%\.jankmark\sessions\. Access via File → Sessions to browse,
  open past sessions with full interactive charts, rename, or delete them.
• Screenshot export — "Screenshot" button in the report dialog captures the
  entire report to a PNG via a system file picker.
• Power consumption stat card and live chart (Watts, computed from battery
  voltage × current).
• Battery percentage live chart.
• Battery voltage live chart (3.0–4.5 V range) — useful for spotting voltage
  sag under sustained gaming load.
• Current draw live chart (0–5 A) — shows instantaneous amp draw in real time.
• Power section in session reports: average power, peak power, average battery %,
  average/minimum voltage, average/peak current.
• 5% Low, 1% Low, and 0.1% Low FPS — three low-percentile stats derived from
  frame-interval percentiles (p95/p99/p99.9), shown on the live dashboard and in
  session reports.
• GPU frequency telemetry — avg and peak GPU clock speed (MHz) in reports,
  alongside CPU frequency stats.
• CPU and GPU clock-frequency gauge toggles — click the unit label ("%" or
  "GHz") on either the CPU or GPU circular gauge to toggle between usage percentage
  and live clock speed. Useful for spotting thermal throttling at a glance.
• Branded onboarding screen — logo and tagline on the connection screen; USB
  and Wi-Fi tiles with illustrated glyphs; animated spinner during device search;
  inline "How to enable USB debugging" guide.
• Four-state session machine — Idle → Connecting → Recording → Stopped, each
  with a distinct visual state.
• Recording indicator: blinking red dot, REC label, and live elapsed mm:ss timer.
• Over-budget shading in the frame-time chart — semi-transparent red fill above
  the 16.67 ms threshold line.
• Live pulse dot on FPS and frame-time plots at the current leading edge.
• Help menu: Open Log Folder and Report an Issue.
• Keyboard shortcuts: Space → Start/Stop, C → Clear, Esc → Stop.
• Clean uninstall prompt in the uninstaller to permanently remove
  %USERPROFILE%\.jankmark\ (settings, sessions, logs).

Changed

• Zero-setup ADB: bundled adb.exe is used automatically — no manual PATH
  configuration or separate ADB install needed.
• CPU usage accuracy: switched from dumpsys cpuinfo (unreliable on Android
  8+) to /proc/stat jiffies-delta, the standard Linux method.
• Report charts use pyqtgraph (already bundled) instead of matplotlib, removing
  ~40 MB from the installed size.
• RAM stat card and RAM chart are linked: clicking the card toggles the chart
  between MB and % view.
• Crosshair value label snaps to the nearest recorded data point and flips below
  the crosshair line near the top of a plot to prevent clipping.
• Installer size ~141 MB (down from ~173 MB).

Fixed

• PausedOverlay (app not in foreground) text was clipping on the second line.
• RAM chart was starting at a 0–1 default range instead of the device's actual
  RAM ceiling.