ENTRY № 01 · LOGGED 08:41
Live % in the menu bar
Your battery percentage and charging state, always in view. A bolt variant and the green accent tell you at a glance that power is flowing.
INPUT CurrentCapacity · RES 1 sField report № 087 — battery telemetry
Your battery’s best friend.
Cellwright is a free, native macOS menu-bar app that keeps a calibrated eye on your battery — live percentage, time-to-full and time-to-empty, cycle count, temperature, and health — with smart alerts that tell you when to plug in… and when to unplug.
0%
CHARGING · 62 W IN
Time-to-full32 MIN
Cycle count214
Temperature31.2 °C
Health94 %
TR-A · Charge / discharge traceFull session · 62 min
Session 0001 · Cellwright 1.0— — : — — : — — localPoll 30 s · 0 network calls
The logbook · 6 entries
Everything it watches, written down.
Six readings, faithfully recorded. Cellwright keeps its eye on the numbers that matter — charge, cycles, temperature, health — and taps you on the shoulder exactly when you should plug in or unplug.
ENTRY № 02 · LOGGED 08:41
Time-to-full & time-to-empty
macOS's own estimates, surfaced where you can see them: how long until full while charging, how much runway you have while unplugged.
SRC macOS estimator · REFRESH 30 sENTRY № 03 · LOGGED 08:42
Cycle count & temperature health
The numbers that actually describe battery wear — cycle count, live temperature, and a health bar comparing max vs design capacity.
RANGE 0–1000 cycles · UNIT °C / °FENTRY № 04 · LOGGED 08:42
Smart unplug alerts
A gentle notification when you hit your low-battery threshold, and another at 100% suggesting you unplug for long-term health. Fires once, never nags.
TRIG 5–50% low · FULL 100%ENTRY № 05 · LOGGED 08:43
No dock icon
Cellwright lives only in the menu bar. No Dock clutter, no window to manage, nothing in your way.
FOOTPRINT menu bar · WINDOWS 0ENTRY № 06 · LOGGED 08:43
Private & offline
Zero network calls, no telemetry, no accounts. Your battery data never leaves your Mac — the app couldn't phone home if it wanted to.
NETWORK 0 calls · TELEMETRY noneMethod & materials
Built the way the OS is built.
Cellwright is a Cloverwright product — native Apple platforms, built in Swift and held to the same standard as our client work. Four steps, from silicon to shoulder-tap:
Read straight from IOKit
Cellwright reads the battery through IOPSCopyPowerSourcesInfo — the same well macOS itself drinks from: CurrentCapacity, MaxCapacity, DesignCapacity, IsCharging, TimeToFullCharge, TimeToEmpty, CycleCount, and Temperature. No guessing, no scraping menubar tooltips.
Native Swift, nothing else
Pure Swift and SwiftUI with a MenuBarExtra scene — no Electron, no webview, no background daemons. It launches in a blink, sips almost no memory, and renders like a first-party macOS citizen.
A 30-second sampling rhythm
Battery state is re-read every 30 seconds — plenty for values that change by the minute, and light enough that Cellwright barely registers on the battery it’s watching. Alerts are delivered once per threshold crossing, never as a nag.
An honest scope
Cellwright is monitoring plus smart alerts — nothing more. macOS gives third-party apps no API to limit charging, so we don’t pretend: at 100%, Cellwright simply suggests you unplug for long-term battery health.
Calibration note
Time estimates are macOS’s own, re-read every 30 seconds — a guide, not a promise: heavy workloads shorten them, idling lengthens them. And Cellwright can’t limit charging to 80% — no third-party Mac app can — so it watches the battery and alerts you at 100% instead.
Rate card · service order
Free. Forever.
Cellwright is a gift from the studio — a small, perfect tool, priced like one.
Rate cardINV-0000 · NO EXPIRY
Every reading — %, estimates, cycles, temperature, healthall six logbook entries, always on the panel
$0.00
Smart plug-in / unplug alerts with your own thresholdsfires once per crossing
$0.00
Launch at login and full SettingsMenuBarExtra, no dock icon
$0.00
Complete Xcode project source includedsix Swift files and a README — fork it, audit it
$0.00
Free updates, whenever Cellwright learns new tricksno subscription machinery
$0.00
Total due$0.00
NO TRIAL · NO SUBSCRIPTION · NO CATCHGet Cellwright free
Field manual · 6 entries
Questions, answered.
Q-01
Can Cellwright limit charging to 80%?
No — and neither can any other third-party Mac app. macOS gives apps no API to start, stop, or limit charging, so Cellwright doesn't pretend otherwise. What it does: watch your battery and alert you at 100% so you can unplug it yourself for long-term battery health.
Q-02
Will Cellwright work on Apple Silicon?
Yes — it's a universal Swift binary that runs natively on both Apple Silicon and Intel Macs running macOS 13 (Ventura) or later.
Q-03
How accurate are the time estimates?
They're macOS's own estimates, derived from your current power draw and charge rate. Treat them as a guide: heavy workloads make them shorter, idling makes them longer. Cellwright re-reads them every 30 seconds so they stay current.
Q-04
Can I customize the notifications?
Yes. Set your own low-battery threshold (5–50%), toggle the full-charge alert, and pick Celsius or Fahrenheit for the temperature readout. Cellwright asks for notification permission on first launch, and every alert fires once per threshold crossing — never as a nag.
Q-05
Does Cellwright drain the battery itself?
Barely. It polls IOKit once every 30 seconds — a trivial read of values macOS already maintains — and otherwise sits idle in the menu bar. No network calls, no background daemons, no measurable impact.
Q-06
Is it really free?
Yes. Free forever, no trial, no subscription, no account. The download includes the full Xcode project source — six Swift files and a README — so you can fork it, audit it, or make it yours.
Acquisition desk · one artifact
Take it to the bench.
Free for macOS 13 and later. One click, and your battery has a new best friend.
- ✓macOS 13 Ventura or later, Apple Silicon & Intel
- ✓Menu bar only — no dock icon, no windows
- ✓Full Xcode source in the zip — fork it, audit it
- ✓$0.00 — no account, no trial, no tracking
Cellwright 1.0 — for macOSApple Silicon & Intel · 116 KB · Free forever
$curl -O https://cellwright.cloverwright.com/downloads/Cellwright-1.0-source.zip
unpack → open in Xcode → press ⌘R → menu bar lights up
This build ships as a complete Xcode project — open it, press ⌘R, and Cellwright moves into your menu bar. A signed, double-clickable release is on the way. Cellwright monitors your battery and sends smart alerts; it does not limit charging. Cellwright is a Cloverwright product.