WattBench
15 days old
Not in any tracked top chart right now.
Updated 24 Oct 2026 · rankings refresh through the day
DeveloperSeth Egger
CategoryUtilities
Price2.99 EUR
Released
Rating★ 5.0 (1)
Version1.2
Age rating4+
First seen by us
14 Oct 2026
14 Oct 2026Rating
5.0 ★
1 ratings
Measured
WattBench on the App Store
App details
App ID
6816404264
Publisher
Seth Egger
On the store since
Oct 2026
Under a year
Minimum OS
iOS 17.0+
iPhone XS and later
Devices
iPhone · iPad
Content rating
4+
Languages
1
EN
Size
6 MB
Also listed in
Developer Tools
Where WattBench's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
5.0 ★
1 ratings
Measured
Ratings
1
Measured
About WattBench
WattBench turns your iPhone into a wireless display, data logger and test bench for the FNIRSI FNB58 USB power meter.
Connect over Bluetooth and watch voltage, current and power live. See what your charger is doing on the USB data lines. Record a whole charge cycle with the phone locked. Then run guided tests that answer real questions: how much a power bank actually holds, how fast a phone really charges, and whether a cable is wasting power.
LIVE
• Big, glanceable voltage, current and power with peak hold
• USB data lines: D+ and D− voltages and the meter's temperature
• Charger detection: Quick Charge, USB PD, Apple, Samsung and BC 1.2 patterns named automatically
• Full-screen chart with V, A, W or all three, up to the last 60 minutes, in portrait or landscape, with pinch to zoom
• Trip counter for energy (Wh) and capacity (mAh) without starting a recording
TESTS
• Power Bank Capacity: compares what a bank really delivers with the mAh on its label
• Device Charge: shows the fast, tapering and trickle phases of a charge, with a battery estimate
• Cable & Charger Check: guides you through load steps with a USB electronic load and grades the resistance of the cable and charger
RECORDINGS AND REPORTS
• Recordings keep running with the screen locked and survive a crash or a Bluetooth drop; dropouts are shown honestly as gaps
• Lock Screen, Dynamic Island and Apple Watch Smart Stack show live readings while you record
• Automatic markers when the charger changes mode or voltage
• Session reports with zoomable charts, range statistics, a power histogram, a voltage-versus-current plot, cumulative energy, temperature and D+/D− over time
• Compare up to four sessions on one chart
• Export PDF reports and CSV files
ALERTS
• Over- and under-voltage, over-current, over-power, current below, voltage drop, disconnect, over-temperature and "fast charge lost", with presets
• Banners in the app, notifications in the background, with Stop & save during a recording
PRIVATE BY DESIGN
No account, no ads, no analytics, no network access. Your recordings stay on your iPhone.
REQUIREMENTS
The FNIRSI FNB58 USB power meter with Bluetooth. Turn Bluetooth on in the meter's settings menu, then tap Connect. A USB electronic load is recommended for the power bank and cable tests. No meter yet? Tap Try Demo Data to explore every screen.
User guide and test recipes: https://redthoroughbred.github.io/wattbench/guide.html
WattBench is an independent project and is not affiliated with or endorsed by FNIRSI.
Connect over Bluetooth and watch voltage, current and power live. See what your charger is doing on the USB data lines. Record a whole charge cycle with the phone locked. Then run guided tests that answer real questions: how much a power bank actually holds, how fast a phone really charges, and whether a cable is wasting power.
LIVE
• Big, glanceable voltage, current and power with peak hold
• USB data lines: D+ and D− voltages and the meter's temperature
• Charger detection: Quick Charge, USB PD, Apple, Samsung and BC 1.2 patterns named automatically
• Full-screen chart with V, A, W or all three, up to the last 60 minutes, in portrait or landscape, with pinch to zoom
• Trip counter for energy (Wh) and capacity (mAh) without starting a recording
TESTS
• Power Bank Capacity: compares what a bank really delivers with the mAh on its label
• Device Charge: shows the fast, tapering and trickle phases of a charge, with a battery estimate
• Cable & Charger Check: guides you through load steps with a USB electronic load and grades the resistance of the cable and charger
RECORDINGS AND REPORTS
• Recordings keep running with the screen locked and survive a crash or a Bluetooth drop; dropouts are shown honestly as gaps
• Lock Screen, Dynamic Island and Apple Watch Smart Stack show live readings while you record
• Automatic markers when the charger changes mode or voltage
• Session reports with zoomable charts, range statistics, a power histogram, a voltage-versus-current plot, cumulative energy, temperature and D+/D− over time
• Compare up to four sessions on one chart
• Export PDF reports and CSV files
ALERTS
• Over- and under-voltage, over-current, over-power, current below, voltage drop, disconnect, over-temperature and "fast charge lost", with presets
• Banners in the app, notifications in the background, with Stop & save during a recording
PRIVATE BY DESIGN
No account, no ads, no analytics, no network access. Your recordings stay on your iPhone.
REQUIREMENTS
The FNIRSI FNB58 USB power meter with Bluetooth. Turn Bluetooth on in the meter's settings menu, then tap Connect. A USB electronic load is recommended for the power bank and cable tests. No meter yet? Tap Try Demo Data to explore every screen.
User guide and test recipes: https://redthoroughbred.github.io/wattbench/guide.html
WattBench is an independent project and is not affiliated with or endorsed by FNIRSI.
Latest updates
1.2