Voltway: Battery & Power
Power flow & battery forensics
Only for Mac
Free · In‑App Purchases
Mac
See exactly where your Mac's watts go — and understand your battery properly.
Voltway draws a live, animated power-flow diagram of your Mac: how many watts are coming out of the wall, how many the Mac is drawing, and whether the battery is charging or supplying. Then it opens up the battery data macOS keeps to itself.
THE POWER FLOW DIAGRAM
Watch power move in real time between the adapter, your Mac and the battery. Flow thickness and particle speed track real wattage, so a heavy charge looks different from an idle desk at a glance. Voltway also shows the USB-C Power Delivery ladder your adapter advertises and which profile was actually negotiated.
It is drawn honestly. Each flow is measured independently, so Voltway says plainly that the figures are not expected to add up exactly — and it never shows your adapter's label rating as if it were live draw. A 96W adapter feeding an idle Mac is delivering about 7W, and Voltway tells you so.
BATTERY FORENSICS
• THREE HEALTH NUMBERS, RECONCILED — macOS genuinely reports three different figures for one battery. Voltway shows all three and explains why they differ, instead of hiding the ones that disagree.
• LEARNED CAPACITY (Qmax) per cell — what the fuel gauge has actually measured your cells can hold, and how recently it re-learned.
• CELL VOLTAGES AND IMPEDANCE — impedance growth is an earlier warning of degradation than capacity fade, and almost nothing surfaces it.
• CYCLES — against the 1000-cycle rating these packs actually carry.
• TEMPERATURE — now, plus the lifetime average, maximum and minimum.
• TIME AT HIGH CHARGE — how long your pack has sat above 80%, measured by Voltway itself.
CHARGE CONTROL (optional)
Limiting charge means writing to your Mac's system power controller, which needs privileges a Mac App Store app is not allowed to request. So Voltway keeps that work in a small, separate, notarized helper you install yourself — the App Store app never escalates and never installs anything.
With Voltway Pro and helper 1.2.1, choose a stop level from 50% to 100% in 1% steps and a separate resume level at least five points lower. Charge control depends on supported firmware. macOS, sleep and safety recovery may allow charging above the selected level. The helper restores normal charging after the connected app stops responding or a safety override takes effect.
Voltway also detects when macOS's own 80% limit is what is holding your battery, so you are never confused about which limit is acting.
WHAT VOLTWAY WILL NOT CLAIM
No Mac exposes a charge-rate control, so Voltway does not pretend to slow your charger. It does not show "cycles saved", because that is not honestly computable, and it does not repeat the folklore about charging to 80%.
VOLTWAY PRO
Free forever: the entire read-only product — the power-flow diagram, the battery forensics, the charge-residency histogram and CSV export. Voltway Free keeps the last 7 days of charge history. No helper, no privileges, no nagging.
Pro adds the charge-control tools above and keeps your full charge history instead of the last 7 days. It is available monthly, annually with a 3-day free trial, or as a one-time lifetime purchase.
Privacy Policy: https://mwsupplylimited.github.io/voltway/privacy.html
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Choose your charge limit precisely.
• Select stop levels from 50% to 100% in 1% steps, with a separate resume level.
• Changing the resume level keeps your chosen stop level unchanged.
• Charge control now follows the percentage displayed by macOS and honors your selected resume threshold.
• Clearer helper setup, update and charging-status messages.
• Helper 1.2.1 keeps the adapter enabled throughout sleep preparation.
Charge control requires Voltway Pro, supported Mac firmware and the optional, separately downloaded Charge Helper 1.2.1. Upgrade the helper from our website, then re-enable your preferred limit. macOS and safety recovery can allow charging above the selected level.
The developer, Matthew Wong, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Matthew Wong
- Size
- 1.6 MB
- Category
- Utilities
- Compatibility
Requires macOS 14.0 or later.
- Mac
Requires macOS 14.0 or later.
- Mac
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Voltway Pro (Annual) $19.99
- Voltway Lifetime $39.99
- Voltway Pro (Monthly) $2.99
- Copyright
- © 2026 MW Supply Limited
