ThunderVolt works out what your battery actually needs — from its measured degradation, your Mac's temperature, and what's on your calendar — then sets the charge ceiling to match and holds it at the hardware level. 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, and heat does more damage than cycle count. macOS can cap charging — but it can't tell you what your battery's real capacity is doing, or move the ceiling when your Mac runs hot, or lift it the night before a 7am flight.
From your calendar and thermal sensors down to the SMC. No terminal, no config files.
Adjust limits, check health, and override modes from whichever device is closest.
Live charge gauge, slider for instant overrides, scheduled rules, and a thermal heatmap, in a 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 over to your Mac.
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. Setup asks for two things: Full Disk Access, which macOS requires before anything can read your battery controller, and an administrator prompt to install a privileged helper. That helper is what reads and writes your Mac’s SMC (System Management Controller), the same hardware interface macOS uses. It does not use Accessibility access. Your battery data stays on your Mac — the app has no analytics and no telemetry.
Other limiters set a ceiling and stop there. ThunderVolt decides what the ceiling should be: BMS Calibration scores 6 signals to keep your health reading honest, health trends show the capacity curve over months, and Adaptive Mode reads heat and your calendar so flights are handled without manual scheduling. It also has native iOS and watchOS apps, where most limiters are Mac-only, and one license covers up to 3 Macs.
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+.
Yes. Cancel anytime from your account. Subscriptions have a 14-day refund window. Your 7-day free trial requires no credit card.
Not your battery data. Charge level, health, cycles, temperature and power draw are processed on your Mac and never sent to us — there is no analytics SDK and no telemetry in the app. Calendar access is read-only and stays on-device, and iPhone-to-Mac communication runs over your local network or your own iCloud account. Two things do reach our licensing server, and only those: the email address you bought with, to check your subscription is active, and a salted hash of your Mac's serial number, so one Mac gets one free trial. Both are itemised in the privacy policy.
Download the app and 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 · No tracking