# Watt Charging Speed — Wattage Meter & Charger Test

> Real-time charger wattage monitoring and comparison tool for iOS devices. (iPhone/iPad app by Sindre Sørensen.)

- Source: https://appshunter.io/ios/app/watt-charging-speed/id6760211479 (this page in markdown: same URL + `.md`)
- Developer: [Sindre Sørensen](https://appshunter.io/developer/1881331882)
- Category: Utilities, Productivity
- Price: $1.99
- Rating: 4.23/5 from 13 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.6 · 3 MB
- Languages: American English, Filipino, French (France), German (Germany), Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål and 6 more
- Released: 2026-03-10
- Data updated: 2026-10-28
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/watt-charging-speed/id6760211479/reviews.md

## What is Watt Charging Speed?

How fast is your charger? Plug in your iPhone or iPad and Watt Charging Speed estimates your charging speed in watts: the power reaching your battery. Tell a fast charger from a slow one, and see whether your cable keeps up.

HOW IT WORKS, HONESTLY
iPhone and iPad don't let apps read the charging power from the hardware. Watt works out the charging speed from how quickly your battery percentage rises, combined with your device's battery capacity. That means:
• The figure is an estimate of the watts reaching the battery. That is less than the charger's rated output: a 20 W charger usually reads below 20 W, and that is expected
• iOS reports the battery level in steps, so the first reading can take up to about 10% of charging. After that, the figure follows your charge
• The longer a session runs, the steadier the estimate
• If Watt doesn't know your device's battery capacity, it says so and uses a typical value

WHAT YOU SEE
• A watt estimate while you charge
• Color-coded speed labels: Fast Charging, Charging, Slow Charging and Trickle Charge
• A charging ring and a graph of the session
• Estimated time until fully charged
• A notice when charging seems to have paused, for example with Optimized Battery Charging

COMPARE CHARGERS AND CABLES
• Create benchmark tests for a battery range (for example 30% → 80%) and run one with each charger or cable
• Compare the results for the same range
• See which charger or cable performs best

CHARGING HISTORY
• Sessions are saved automatically with average watts, duration and battery range
• Label each session with the charger you used
• Compare sessions over time to spot a slow cable or an aging charger

MADE FOR YOUR DEVICE
• Has the battery size of every iPhone and iPad that runs iOS 18.6: from iPhone XS to iPhone 18 Pro Max and iPhone Duo, and from older iPads to the latest iPad Pro (M5)
• On a few iPhone Pro models Watt asks once whether your iPhone has a SIM card tray, because the battery differs slightly. You can change the answer in Settings
• On iPad and an open iPhone Duo, the charging ring and status stay on screen while you switch between Details and Benchmark

PRIVATE, ONE PRICE
• Pay once: no subscription, no ads, no account
• No tracking. All data stays on your device
• Works offline

FEEDBACK
Something looks off, or you have an idea? Tap Send Feedback in Settings or in How It Works. It opens an email with your app version, iOS version and device model filled in.

GOOD TO KNOW
iOS pauses apps in the background, so keep Watt Charging Speed open while it follows your charge. It keeps the screen awake during a session so nothing is interrupted.

Perfect for testing a new charger, finding out why charging feels slow, or settling which of your cables belongs in the drawer.

## Key features

- Real-time wattage display
- Color-coded speed indicator
- Estimated time to full charge
- Benchmark different chargers
- Charging history tracking
- Offline functionality

## Chart rankings

- #59 in Top Paid · Utilities (US App Store)

## Is Watt Charging Speed safe?

Not enough ratings yet to assess Watt Charging Speed.

## Is Watt Charging Speed legit?

Watt Charging Speed appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Watt Charging Speed is 65 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/watt-charging-speed/id6760211479/reviews.md

### 1/5 — Does NOT work!

*2026-07-29*

Don’t waste your money

### 2/5 — Deceptive Description

*2026-06-19*

This app doesn’t actually give you “real time” wattage as it claims. It attempts to calculate based on battery level changes but this often yields absurd results which are not technically possible.

**Developer response:** You're right on both counts, and this review pushed us to fix it properly. Thank you.

The absurd readings came from how we calculated wattage: iOS only reports battery level in coarse 5% steps, often with a delay, and our old approach measured over a short time window — so a delayed level jump could produce spikes that were physically impossible. Update 1.1.1 replaces this: wattage is now measured between observed level changes, so both endpoints sit exactly on a step boundary, and readings that would be distorted by delayed reporting after unlocking are discarded. The impossible spikes are gone.

You're also right that "real-time wattage" oversold it. iOS doesn't give apps access to a hardware power meter — every reading is an estimate derived from battery level changes and your device's battery capacity. We've rewritten the App Store description to say exactly that, and the app now needs a few minutes before showing its first (reliable) number instead of showing a fast wrong one.

If you give 1.1.1 a try and still catch an implausible reading, we'd genuinely like to hear about it.

### 2/5 — 측정하기 너무 힘듬..

*2026-06-01*

화면이 꺼지면 측정이 안된다고 안내하면서, 화면은 자꾸 꺼지도록 되어있음. 계속 화면을 쳐다보면서 안꺼지게 터치해야함. isIdleTimerDisabled = true 가 필요함.

**Developer response:** 정확한 진단 감사합니다 — 말씀하신 그대로였습니다.

사실 앱에는 isIdleTimerDisabled 처리가 있었지만, 충전 상태가 "변경될 때"만 동작하도록 되어 있었습니다. 그래서 충전기를 먼저 연결한 뒤 앱을 여는 경우(대부분의 사용자가 이렇게 사용하시죠) 상태 변화가 감지되지 않아 화면이 계속 꺼졌던 것입니다.

1.1.1 업데이트에서 수정했습니다: 이제 앱을 열 때 이미 충전 중이어도 화면이 꺼지지 않으며, 앱이 다시 활성화될 때마다 설정을 재적용합니다. 더불어 측정이 중단되었더라도 세션 전체의 평균 전력을 표시하도록 개선했고, 벤치마크 테스트가 멈추는 문제도 함께 수정했습니다.

덕분에 가장 중요한 버그를 잡을 수 있었습니다. 업데이트 후에도 문제가 있다면 꼭 알려주세요!

### 1/5 — A fuir

*2026-05-16*

attention cet appli ne fait que calculer le temps entre un changement de % de batterie et estime une puissance de charge, ne vous faites pas avoir comme moi !

**Developer response:** Vous avez raison sur la méthode — et c'est justement le problème : notre description ne le disait pas assez clairement. Merci de nous l'avoir signalé, nous l'avons corrigée.

Pour être totalement transparent : iOS ne donne à aucune app l'accès à un wattmètre matériel. Estimer la puissance à partir de la vitesse de montée du niveau de batterie, combinée à la capacité exacte de la batterie de votre appareil, est la seule méthode possible — c'est ce que font toutes les apps de ce type. La nôtre aurait simplement dû l'assumer dès la première ligne.

Depuis, deux choses ont changé : la description sur l'App Store explique désormais honnêtement comment l'estimation fonctionne et ses limites, et la mise à jour 1.1.1 rend cette estimation nettement plus fiable (mesure entre les changements de niveau observés, plus de pics impossibles, moyenne de session après interruption).

Si vous lui redonnez une chance, nous serions heureux d'avoir votre avis — et si l'app ne vous convient toujours pas, votre critique nous aura au moins aidés à être plus honnêtes. Merci.

### 5/5 — Best modern tool -

*2026-03-29*

If you looking for decent tool that actually works get this

**Developer response:** Thank you for your review!

## Frequently asked questions about Watt Charging Speed

### What is Watt Charging Speed?

Watt Charging Speed is a utility app that displays your device's real-time charging wattage. It helps you identify fast vs. slow chargers and track charging history.

### How does Watt Charging Speed work?

Simply plug your iPhone or iPad into a charger, and the app will show the live wattage output. It also provides a color-coded indicator for charging speed and estimates the time to a full charge.

### Can I compare different chargers with Watt Charging Speed?

Yes, you can benchmark your chargers and cables by creating custom battery range tests and comparing their performance side by side within the app.

### Does Watt Charging Speed require an internet connection?

No, Watt Charging Speed is designed to work completely offline. It does not require an internet connection and all data stays on your device.

### Is Watt Charging Speed free to use?

Watt Charging Speed is a paid app, available for $0.99. It does not contain ads or in-app purchases.

### What devices are supported by Watt Charging Speed?

Watt Charging Speed is compatible with iPhones and iPads. It has an age rating of 4+.

### How often is Watt Charging Speed updated?

The latest version, 1.1.0, was released on April 22, 2026. Updates typically address performance improvements and new features.

### What do users think of Watt Charging Speed?

Based on the available data, Watt Charging Speed has a perfect 5.0-star rating from 3 reviews, indicating a very positive user sentiment.

## Version history (last 5 releases)

### 1.5 — 2026-10-26

New devices, a clearer first reading and a better iPad layout:
• The first reading can take up to about 10% of charging, and Watt now says so while it waits
• Battery sizes for iPhone 18 Pro, iPhone 18 Pro Max, iPhone Duo and iPhone 17e, and for iPad Pro (M5), iPad Air (M3 and M4), iPad (A16) and iPad mini (A17 Pro)
• Battery sizes for iPhone XS, iPhone XS Max, iPhone XR and older iPads too, so every iPhone and iPad that runs iOS 18.6 is covered
• Corrected battery sizes for iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max and iPad (10th generation)
• iPhone 17 Pro and iPhone 17 Pro Max outside the US: battery data is now more accurate for your model, so readings may differ slightly from earlier sessions
• On some iPhone Pro models Watt asks once whether your iPhone has a SIM card tray, so it uses the right battery. You can change the answer in Settings
• Devices Watt doesn't know yet now show "Battery capacity estimated for this device"
• New on iPad and an open iPhone Duo: the charging ring and status stay on screen while you switch between Details and Benchmark
• New: Send Feedback in Settings and in How It Works

### 1.4 — 2026-09-15

Accuracy fixes for sessions and benchmarks:
• Sessions that charge all the way to 100% are now saved with the correct end level and duration
• A benchmark no longer saves a misleading result if the app was in the background when the target level was reached — it now tells you to run the test again
• A finished benchmark no longer keeps the screen awake or blocks other tests
• The live wattage follows the current rate when charging slows down, and very low power is correctly shown as trickle charging
• Fixed text being cut off with "…" when a large accessibility text size is enabled

### 1.3 — 2026-08-27

Your charging history just got personal:
• Label each session with the charger and cable you used, and add your own notes — tap any past session to edit
• Sessions are no longer lost if you unplug while the app is in the background
• New "Charging Paused" state when iOS pauses charging, and clearer guidance while measuring
• Accurate wattage on iPhone 11, 12, and SE models
• Benchmark results now show the battery range actually measured, plus localized number formatting and bug fixes

### 1.2 — 2026-07-31

Charging just got more insightful:
• Watt graph for every benchmark result — see how each charger performed over time
• Rename benchmark tests and charger labels
• Haptic feedback when you plug in, complete a benchmark, or save a session
• Smoother graphs during long sessions, improved translations, and bug fixes

### 1.1.2 — 2026-07-20

Improved timing of the rating prompt — it now only appears after a completed measurement or benchmark, never during one.

## Apps similar to Watt Charging Speed

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Watt CS: Charging Speed Meter](https://appshunter.io/ios/app/watt-cs-charging-speed-meter/id6766040428) | 5.0 (1) | $0.99 | Utilities |
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All apps by Sindre Sørensen: https://appshunter.io/developer/1881331882

## Related topics

[cable charging](https://appshunter.io/ios/topics/cable-charging) · [watt charging speed](https://appshunter.io/ios/topics/watt-charging-speed) · [charging speed testing](https://appshunter.io/ios/topics/charging-speed-testing)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-28.*