# 4level

> Monitor rainwater or septic tank levels. Push alerts and widgets.

Canonical page: [https://chrome-stats.com/d/pl.ghostek.fourlevel](https://chrome-stats.com/d/pl.ghostek.fourlevel)

## Overview

- **ID:** `pl.ghostek.fourlevel`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** GHOSTek
- **Category:** TOOLS
- **Downloads:** 2
- **Last updated:** 2026-08-05
- **First published:** 2026-08-05
- **Publisher country:** PL
- **Data as of:** 2026-09-09
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=pl.ghostek.fourlevel)
- **Website:** [https://ghostek.pl](https://ghostek.pl/)
- **Privacy policy:** [https://ghostek.pl/polityka-prywatnosci.html](https://ghostek.pl/polityka-prywatnosci.html)

## Description

4level is a companion app for the 4level wireless liquid level sensor. Monitor the level in your septic tank, rainwater tank, or well from your phone—without opening the lid.<br><br>REQUIRED DEVICE: The app works with the 4level sensor (available for purchase at ghostek.pl). Without the sensor, the app won&#39;t display measurements.<br><br>KEY FEATURES:<br><br>📊 Current Level and Measurement History<br>Clear level graphs from the sensor&#39;s entire operating history. You can see the filling trend and a forecast for when the tank will be full.<br><br>🔔 Instant Push Alerts<br>Set an alarm threshold—when the level exceeds it, you&#39;ll receive a push notification with vibration. Further reminders will be sent if the level continues to rise. No more overflowing septic tanks.<br><br>📱 Home Screen Widget<br>The tank level is always visible on your phone&#39;s desktop—no need to open the app. The widget refreshes automatically.<br><br>🔋 Sensor Battery Status<br>The app displays the device&#39;s battery level and warns when it&#39;s time to replace it (a set of 4 AA batteries lasts over a year).<br><br>📧 Email Notifications<br>In addition to push notifications, you can enable email notifications—useful when your phone is out of range.<br><br>🏠 Home Assistant Integration<br>The sensor can be connected to your Home Assistant via MQTT—entities appear automatically.<br><br>HOW IT WORKS:<br>The 4level sensor is mounted above the tank. The millimeter-wave radar measures the level contactlessly (accuracy ±1 cm, range up to 10 m) and sends data via Wi-Fi to the cloud. The app displays measurements in real time and alerts when the threshold is exceeded.<br><br>APPLICATIONS:<br>• Septic tank and sewage tank—overflow alarm<br>• Rainwater tank—controlling water supply for irrigation<br>• Well—monitoring groundwater levels<br>• Any liquid tank

## Rankings

- #3,055,113 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/pl.ghostek.fourlevel)