ThunderVolt controls your charging at the hardware level — automatically, intelligently, every 60 seconds. With companion apps for iPhone and Apple Watch.
From €2.99/mo · No credit card required · Cancel anytime
Every charge cycle above 80% accelerates electrochemical aging. macOS caps charging at 80% — but only sometimes, only manually, and never intelligently.
Six purpose-built systems working together — from the SMC up to your calendar. No tweaks, no terminal, no compromises.
One battery brain. Three glass surfaces. Adjust limits, peek at health, override modes — from whichever device is closest.
Live charge gauge, slider for instant overrides, scheduled rules, and a thermal heatmap — all in a single menu bar app under 12 MB.
Notifications when Adaptive Mode shifts gears. Tap to override, swipe to dismiss, never spam. Full charge-control lives one tap deeper.
Glance at battery health, toggle modes, and confirm charging status without pulling out your phone — or walking to your Mac.
Finally an app that actually writes to the SMC instead of just showing me numbers. Adaptive Mode is surreal — my Mac is at 65% when hot, 80% normally, and 100% for flights.
Software Engineer, MacBook Pro M3
I used another charge limiter for a year. ThunderVolt's calendar integration alone is worth switching — it knows my flights before I do. Battery health went from 89% to 95% after calibration.
Product Designer, MacBook Air M2
The iPhone widget + Watch complication combo is what sold me. I can check my Mac's battery from the couch. Zero data leaves my devices. That matters.
Security Researcher, MacBook Pro M4
Every plan includes Mac, iPhone, and Apple Watch. 7-day free trial. No credit card required.
All plans include a 14-day refund window. Compare all features on our Pro page.
Yes. ThunderVolt is Apple-notarized, signed with a verified Developer ID, and undergoes automated malware scanning. It requires Accessibility access to write charge limits to your Mac's SMC (System Management Controller) — the same hardware interface macOS uses. No data leaves your device, ever.
Three differences: (1) ThunderVolt includes native iOS and watchOS companion apps — other limiters are Mac-only. (2) Adaptive Mode reads your calendar for automatic flight/travel charging — others require manual scheduling. (3) Our BMS Calibration uses 6-signal scoring vs basic cycle count. Plus, ThunderVolt costs less and works on up to 3 Macs per license.
ThunderVolt works on all Apple Silicon Macs (M1–M4) and Intel Macs with a T2 chip or later, running macOS 14 Sonoma or newer. This includes MacBook Air, MacBook Pro, iMac, Mac Mini, Mac Studio, and Mac Pro. iPhone requires iOS 18+. Apple Watch requires watchOS 11+.
Absolutely. You can cancel anytime from your account — no questions asked. Subscriptions have a 14-day refund window. Your 7-day free trial requires no credit card.
No. Zero. ThunderVolt processes all battery data locally on your Mac. We don't have servers to send it to. Calendar access is read-only and stays on-device. iPhone-to-Mac communication is end-to-end encrypted over your local network or iCloud.
Download the app, start your trial — no credit card needed. Full access to all Pro features for 7 days. After the trial, subscribe to continue. If you don't subscribe, the app reverts to Free tier with basic charge limits and monitoring.
7-day free trial. No credit card. Works on up to 3 Macs.
Download ThunderVolt Free →For macOS 14+ · Apple Silicon & Intel · 100% private