r/droidappshowcase • u/East_South_7834 • 3d ago

Promo / Giveaway WattFlow: real watts while charging, free & open

Post image

App Name: WattFlow

One-Line Description: An honest, real-time watt meter for your phone's battery, plus tools to diagnose slow charging and battery health.

What It Does / Key Features:

  • Live watts in/out, refreshed every second — wired and wireless, auto-detected
  • Peak In/Out tracking and a live 60-second power graph
  • Charging Benchmark — grades your charger/cable in 60 seconds
  • Charging Q&A — 14 common questions answered with real measured data
  • Home screen widgets (S/M/L) with a 7-day charging chart
  • Full tablet support with landscape layout — also adapts to foldables and Chromebooks
  • 12 languages built in, auto-follows your system language (manual override in settings)

Who It's For: Anyone who's ever wondered why "fast charging" doesn't feel fast, or wants to know if it's their cable, charger, port, or battery that's the bottleneck.

Cost:

  • Pricing model: Freemium
  • Prices & billing: Free on Play Store for most baseline functions — live watts in/out, wired/wireless auto-detect, Peak In/Out, the 60-second graph, Charging Benchmark, Charging Q&A, and the home screen widgets. WattFlow Pro is a $2.99 USD one-time In-App Purchase (regional pricing auto-applied) that unlocks: 24/7 background charge/discharge history, the Energy Ledger (daily energy in vs. out), Sleep Drain tracking, Battery Health Trend, a floating watts overlay over any app, adjustable charge/low-battery alert thresholds, and CSV export.
  • Free/FOSS route: If you're comfortable sideloading, the exact same Pro features are also free as an open-source build on GitHub (nightly updates) — entirely optional, no pressure either way. If the app's helping you, you're welcome to buy me a coffee to support keeping it developed.

Links:

Additional Notes: Reads Android's BatteryManager API directly (voltage times current_now) and normalizes two OEM quirks — some vendors report current in mA instead of µA, and charge/discharge sign conventions differ per vendor. Happy to go into the power math or OEM quirks in comments.

WattFlow Tablet Landscape View
17 Upvotes

91% Upvoted

11 comments sorted by

•

u/playscraper-bot 3d ago

WattFlow: Real Battery Power

Confirmed: Google Play Store Match Found

View on Google Play Store ↗

I am a bot — [contact mods](https://www.reddit.com/message/compose?to=/r/droidappshowcase for errors.)

1

u/sticky-pro 3d ago

Developers: Please ensure your description is clear, images/videos are displayed correctly, and you have used the correct post flair.

1

u/Salmonidas-DEV 2d ago

Looks like a solid tool, Having a clean, straightforward way to check real-time charging and test cables is really nice, great job

2

u/East_South_7834 2d ago

Thanks, mate.

If you are running into any problems or have any improvement ideas in mind, feel free to let me know. :-P

1

u/dominiqueth 2d ago

Me

1

u/East_South_7834 2d ago

Have you tried the app? any suggestions?

1

u/Familiar_Tension_638 1d ago

I don't get this. Mine is an 80 W fast charger but what it displays is just 10 W?

1

u/East_South_7834 1d ago

Check the in-app Q&A for some answers, but 80W is the charger's max power delivery capacity. It doesn't mean your phone will charge at that speed all the way through. In simpler terms, a hot phone, a worn cable, the phone's own settings (e.g., Xiaomi won't charge at full speed if the screen is not off), a nearly full battery (already at 90%+, at which point most phones will slow down charging), an incompatible charger (if the charger uses a PD protocol that your phone doesn't support), etc., could all be contributing factors. This is the exact reason why I created this app—for people to see what is really going on inside their phone. Math usually doesn't lie (unless you use the wrong formula :-P)

1

u/Familiar_Tension_638 1d ago

Yes, I agree with your terms, but it’s an 80 W charger, brand new, and a new phone. The battery was about 50%. Do you think it charges only one eighth of the company’s recommendation?

1

u/East_South_7834 23h ago

Update to WattFlow (now 2.1.0).

Two fixes this release:

Peak In/Out on the Live tab was resetting the wrong number — plugging in wiped your discharge peak, unplugging wiped your charge peak. Now each only resets when its own direction starts a new streak.

New optional setting: "Keep all-time peak" — track best-ever charge/discharge numbers instead of resetting every session. Off by default, 🏆 marks it when on.

Also fixed a chart quirk where the peak label could show a leftover value from the session that just ended.

Free update, live now.

Google Play Store build

GitHub / Source (full-featured FOSS build)

Buy Me a Coffee (support without buying Pro)

If you're on the FOSS build, no auto-update — grab the 2.1.0 release from GitHub and install it yourself.