General
- The web apps are made out of own interest and to test new browser technologies.
- The web apps do not contain any ads.
- I do not collect any data (except the data that is automatically stored by the webserver, see Data Protection).
- You can see the Permissions and the Stored Data for each web app in the web app details.
- Every web app which stores local data has a 'Delete All' function to clear the localstorage.
- You can easily review the code of each web app just by using the view source function of your browser.
- The web apps are free of charge and provided 'as is', without warranty of any kind, see Terms of Use (License).
- Installing Progressive Web Apps (PWA): pwa_install_en.pdf
- Progressive Web Apps (PWA) installieren: pwa_install_de.pdf
- Android is a trademark of Google LLC
- iPad, iPod, iPhone and Safari are trademarks of Apple Inc., registered in the U.S. and other countries.
- Microsoft®, Windows® are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
Web App: Simple Time Tracker
Description: Simple Time Tracker helps you to track your weekly working time (or any other time). You can set start time, end time and duration of your break and calculate the summary for each day. The weekly overview keeps you up to date with the summaries for each day. Please read Important Saving Issues to prevent data loss.
Note: The development of the previous version Weekly Time Tracker has been stopped. Please use Simple Time Tracker instead.
Supported Devices: Simple Time Tracker should run on iPhones/iPads (iOS11.3 or higher, Safari) and Android devices (4.4 or higher, Chrome, Firefox). It should also run on Windows Phone devices but this has not been tested.
Legal: Simple Time Tracker is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for correctness and completeness of the information provided. Use at your own risk. For details please see Terms of Use (License).
Load Web App https://time.cjpj.de
Web App Details | |
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Title: | Simple Time Tracker |
Version: | 2.7 - Release Date: 04.09.2020 |
Permissions: | Internet connection - link to legal pages (not needed for function) |
Stored Data: | Start/end/break time for each weekday using localstorage |
Web App URL: | https://time.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Stopwatch
Description: Simple Stopwatch is a stopwatch with basic functions. You can select start/stop and set a split time. There is a large time display in landscape mode. The maximum stop time is 10 hours.
Important: Setting Display-Timeout to OFF will prevent your device from dimming and locking the screen. This can drain your battery.
Supported Devices: Simple Stopwatch should run on iPhones/iPads (iOS11.3 or higher, Safari) and Android devices (4.4 or higher, Chrome, Firefox). It should also run on Windows Phone devices but this has not been tested.
Legal: Simple Stopwatch is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for correctness and completeness of the information provided. Use at your own risk. For details please see Terms of Use (License).
Load Web App https://sw.cjpj.de
Web App Details | |
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Title: | Simple Stopwatch |
Version: | 4.0 - Release Date: 12.08.2020 |
Permission: | Internet connection - link to legal pages (not needed for function) |
APIs: | Screen wake lock API - set display timeout off |
Stored Data: | - |
Web App URL: | https://sw.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple List
Description: Simple List is a simple ToDo list with 4 list types. You can filter by list type and search for list items. You can also add often used items from a history list. Please read Important Saving Issues to prevent data loss.
Note: The development of the jQuery based version has been stopped. Please use this version instead.
Supported Devices: Simple List should run on iPhones/iPads (iOS11.3 or higher, Safari) and Android devices (5 or higher, Chrome, Firefox). It should also run on Windows Phone devices but this has not been tested.
Legal: Simple List is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for correctness and completeness of the information provided. Use at your own risk. For details please see Terms of Use (License).
Load Web App https://list.cjpj.de
Web App Details | |
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Title: | Simple List |
Version: | 1.5 - Release Date: 10.10.2020 |
Permission: | Internet connection - link to legal pages (not needed for function) |
Stored Data: | List item/type/date/time and last used items using localstorage |
Web App URL: | https://list.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: my smart tv
Description: my smart tv is a simple links list for German Media Libraries (Mediatheken), video on demand, video and news sites.
Supported Devices: my smart tv is a responsive website and optimized for displaying on tv screens but it can also be used on iPhones/iPads and Android devices. It should also run on Windows Phone devices but this has not been tested.
Legal: my smart tv is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for correctness and completeness of the information provided. Use at your own risk. For details and external links please see Terms of Use (License) and Disclaimer.
Load Web App https://mystv.cjpj.de
Web App Details | |
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Title: | my smart tv |
Release Date: | 26.01.2023 |
Permission: | Internet connection - link to external pages |
Stored Data: | - |
Web App URL: | https://mystv.cjpj.de |
Web App: Simple Battery
Description: Simple Battery shows basic information about your mobile device battery (Current Level, Charging Status). With Track Charging you can track how long it takes to charge your battery. Please read Important Saving Issues to prevent data loss.
Supported Devices: Simple Battery only runs on Chrome on Android (5.X or higher). Firefox seems not to support battery level anymore. Chrome on Android seems not to support the charging/discharging time.
Legal: Simple Battery is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for correctness and completeness of the information provided. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://bat.cjpj.de
App Details | |
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Title: | Simple Battery |
Version: | 4.3 - Release Date: 10.10.2020 |
Permission: | Internet connection - link to legal pages (not needed for function) |
APIs: | navigator.getBattery - get battery status |
Stored Data: | Charging date/time/level/duration using localstorage if track charging is activated |
Web App URL: | https://bat.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Gemischrechner
Beschreibung: Gemischrechner (only German version available) ermittelt die Mengen für 2Takt Öl - Benzin Gemische. Für gängige Mischungsverhältnisse können Benzin-/Ölmengen berechnet oder aus einer Tabelle entnommen werden.
Unterst. Geräte: Gemischrechner sollte auf iPhone/iPads (ab iOS11.3, Safari) und Android Systemen (ab 4.4, Chrome, Firefox) funktionieren. Es müsste auch auf Windows Phone Geräten laufen aber das wurde nicht getestet.
Nutzungsbedingungen: Gemischrechner ist kostenlos. Keine Gewähr für Richtigkeit der bereitgestellten Informationen! Benutzung auf eigene Gefahr. Werte sind gerundet. Weitere Details unter Nutzungsbedingungen (Lizenz) und Haftungsbeschränkung.
Load Web App https://mix.cjpj.de
App Details | |
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Title: | Gemischrechner |
Version: | 4.0 - Release Date: 15.10.2023 |
Permission: | Internet connection - link to legal pages (not needed for function) |
Stored Data: | - |
Web App URL: | https://mix.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Level
Description: Simple Level can be used as simple spirit level on devices with a gyro sensor (gyroscope). Devices should have a flat back side. There is a circular and a tubular mode available, depending on device orientation. Please Calibrate before use. Please read Important Saving Issues to prevent data loss.
Supported Devices: Simple Level works best with Chrome on Android 5.X or higher. For Safari (iOS13 and later) you have to calibrate and grant the Motion&Orientation access. Safari, Firefox do not support tubular mode.
Legal: Simple Level is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy of displayed information. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://lev.cjpj.de/
App Details | |
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Title: | Simple Level |
Version: | 5.2 - Release Date: 22.04.2023 |
Permission: | Internet connection - link to legal pages (not needed for function) Motion&Orientation access - Grant required for iOS13+ |
APIs: | deviceOrientationEvent - get orientation |
Stored Data: | Calibration values/date/time using localstorage |
Web App URL: | https://lev.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Ruler
Description: Simple Ruler can be used to measure short length with a ruler on your screen. Landscape mode is highly recommended. Please Calibrate before use by measuring your horizontal screen width in landsscape mode with a real ruler. Verify the result after calibrating with a real ruler. Please read Important Saving Issues to prevent data loss.
Supported Devices: Simple Ruler works best on Android 5.X or higher with Chrome. You should create an icon on your start screen and launch the web app in full screen mode.
Legal: Simple Ruler is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy of displayed information. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://rul.cjpj.de
App Details | |
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Title: | Simple Ruler |
Version: | 3.6 - Release Date: 10.10.2020 |
Permission: | Internet connection - link to legal pages (not needed for function) |
Stored Data: | Calibration date/time/value/unit using localstorage |
Web App URL: | https://rul.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Speed
Description: Simple Speed measures your current speed in km/h (kilometer per hour) or mph (miles per hour). You can also track you max. speed. A device with activated GPS is required.
Important: Setting Display-Timeout to OFF will prevent your device from dimming and locking the screen. This can drain your battery.
Supported Devices: Simple Speed should run on iPhones/iPads (iOS11.3 or higher, Safari) and Android devices (4.4 or higher, Chrome, Firefox). Switching off the display-timeout will only work on newer Android devices.
Legal: Simple Speed is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy of displayed information. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://speed.cjpj.de
App Details | |
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Title: | Simple Speed |
Version: | 4.0 - Release Date: 12.08.2020 |
Permission: | Internet connection - link to legal pages (not needed for function) precise Location (GPS and network-based) |
APIs: | Geolocation API - get position Screen wake lock API - set display timeout off |
Stored Data: | - |
Web App URL: | https://speed.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Position
Beschreibung: Simple Position (only German version available) ermittelt die geograph. Breite und Länge in Dezimalgrad (5stellig gerundet). Gerät mit aktiviertem Standortdienst wird benötigt. Die Position kann auf Karte gezeigt oder per externer Anwendung gesendet bzw. geteilt werden (jeweils als externe Links zu Google Maps).
Wichtig: Google Maps ist nicht in diese App integriert, sondern wird nur als externe Webseite aufgerufen und die Position übergeben
Unterst. Geräte: Simple Position sollte auf Android Systemen (ab 6, Chrome) und iPhones/iPads (iOS12.2 oder höher, Safari) funktionieren. Firefox, ältere iPhones und ältere Android Geräte unterstützen die Senden/Teilen Funktion nicht.
Nutzungsbedingungen: Simple Position ist kostenlos. Keine Gewähr für Funktion oder Richtigkeit der bereitgestellten Informationen! Benutzung auf eigene Gefahr. Werte sind gerundet. Weitere Details unter Nutzungsbedingungen (Lizenz) und Haftungsbeschränkung.
Load Web App https://pos.cjpj.de
App Details | |
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Title: | Simple Position |
Version: | 4.4 - Release Date: 05.09.2020 |
Permission: | Internet connection - Link auf Maps Seite genauer Standort (GPS and network-based) |
APIs: | Geolocation API - Positionsermittlung Web Share API - Positionsübergabe |
Stored Data: | - |
Web App URL: | https://pos.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Light
Description: Simple Light just shows different color lights on your screen. You can set color, size, blinking mode and deactivate the display-timeout. It also shows the current battery level.
Important: Deactivation of display-timeout can drain your battery. Deactivation is done by a workaround (playing a preloaded, invisible, small video in a loop).
Supported Devices: Simple Light should run on iPhones/iPads (iOS11.3 or higher, Safari) and Android devices (5.0 or higher, Chrome, Firefox). It should also run on newer Windows Phone devices but this has not been tested. No Battery level support for iOS and Windows Phone. Firefox seems not to support battery level anymore.
Legal: Simple Light is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy of displayed information. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://light.cjpj.de
App Details | |
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Title: | Simple Light |
Version: | 3.2 - Release Date: 12.09.2020 |
Permission: | Internet connection - link to legal pages (not needed for function) |
APIs: | navigator.getBattery - get battery status |
Stored Data: | - |
Web App URL: | https://light.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Notes
Description: Simple Notes just offers you a fast and easy way to keep your text notes. Please read Important Saving Issues to prevent data loss.
Supported Devices: Simple Notes should run on iPhones/iPads (iOS11.3 or higher, Safari) and Android devices (4.4 or higher, Chrome, Firefox). It should also run on newer Windows Phone devices but this has not been tested (Win Phone 8.1 seems to have problems to edit a note).
Legal: Simple Notes is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy of displayed information. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://notes.cjpj.de
App Details | |
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Title: | Simple Notes |
Version: | 3.7 - Release Date: 10.10.2020 |
Permission: | Internet connection - link to legal pages (not needed for function) |
APIs: | Web Share Target API - receive Share Info |
Stored Data: | Notes text/date/time using localstorage |
Web App URL: | https://notes.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Draw
Description: Simple Draw is a simple drawing app with basic functions. You can select different colors and shapes from the menu. Please read Important Saving Issues to prevent data loss.
Supported Devices: Simple Draw should run on iPhones/iPads (iOS11.3 or higher, Safari) and Android devices (4.4 or higher, Chrome, Firefox). It should also run on Windows Phone devices but this has not been tested.
Legal: Simple Draw is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for correctness and completeness of the information provided. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://draw.cjpj.de
App Details | |
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Title: | Simple Draw |
Version: | 2.6 - Release Date: 10.10.2020 |
Permission: | Internet connection - link to legal pages (not needed for function) |
Stored Data: | Drawings (SVG) using localstorage |
Web App URL: | https://draw.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Altitude
Description: Simple Altitude shows the height of the position above the mean sea level in meters or feet (measured via GPS, integer rounded). You can save an altitude and show the delta (difference) to your current altitude. Please read Important Saving Issues to prevent data loss
Important: If GPS signal is too low just wait a few seconds. If GPS signal is still too low (e.g. in a building) try to get a better signal outside, press Reset and try again.
Supported Devices: Simple Altitude should run on iPhones/iPads (iOS11.3 or higher, Safari) and Android devices (5 or higher, Chrome, Firefox). On Android devices altitude accuracy may not to be supported and the height deviation seems to be larger. For some devices, the altitude may not be supported at all.
Legal: Simple Altitude is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy of displayed information. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://alti.cjpj.de
App Details | |
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Title: | Simple Altitude |
Version: | 1.7 - Release Date: 16.02.2023 |
Permission: | Internet connection - link to legal pages (not needed for function) precise Location (GPS and network-based) |
APIs: | Geolocation API - get position |
Stored Data: | Saved altitude in meter, timestamp using localstorage |
Web App URL: | https://alti.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Tel
Beschreibung: Simple Tel (only German Version) ermöglicht die einfache Wahl einer Telefonnummer. Bis zu fünf große Buttons mit Namen und Telefonnummer sind konfigurierbar. Bei Button Klick wird die Telefonnummer an die Telefon App des Handys übergeben. Der Anruf erfolgt dann wie gewohnt über die Telefon App. Über eine Schutzansicht kann die Button-Konfiguration aus- und eingeblendet werden (auf Startseite 3 Sek. oben auf Simple Tel drücken). Zur Vermeidung von Datenverlust bitte Wichtige Speicherhinweise lesen.
Wichtig: Bitte keine Testanrufe von Notrufnummern durchführen! Leider ist das Testen von Notrufnummern (z.B. 110, 112) nicht möglich, da es sich im gesetzlichen Sinne um einen Missbrauch der Notrufnummern handelt und strafrechtlich durch die Behörden verfolgt werden kann.
Unterst. Geräte: Simple Tel sollte auf Android Systemen (ab 6, Chrome) und iPhones/iPads (iOS12.2 oder höher, Safari) funktionieren.
Nutzungsbedingungen: Simple Tel ist kostenlos. Keine Gewähr für Funktion oder Richtigkeit der bereitgestellten Informationen! Benutzung auf eigene Gefahr. Weitere Details unter Nutzungsbedingungen (Lizenz).
Load Web App https://tel.cjpj.de
App Details | |
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Title: | Simple Tel |
Version: | 1.3 - Release Date: 04.12.2021 |
Permission: | Internet connection - link to legal pages (not needed for function) |
APIs: | Aufruf Telefon Funktion über tel: URL |
Stored Data: | Name und Telefonnummer über localstorage |
Web App URL: | https://tel.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Lamp
Description: Simple Lamp is a simple pocket lamp using the camera flash light of your device. There is also a blink and a hold mode. A warning appears if battery level is below 25%. You have to grant camera access after first start.
Supported Devices: Simple Lamp only runs in Chrome on Android devices (Version 8 or higher). Device must have a camera with a camera light.
Note: As you can not directly access the camera light with JS this web app uses a workaround. MediaDevices function and ImageCapture are used to switch the lamp on and off. This can be considered as experimental.
Legal: Simple Lamp is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy or function. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://lamp.cjpj.de
App Details | |
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Title: | Simple Lamp |
Version: | 1.0 - Release Date: 15.12.2020 |
Permission: |
Camera - accessing the device lamp Internet connection - link to legal pages (not needed for function) |
APIs: | navigator.mediaDevices - get camera functions for lamp navigator.getBattery - get battery status |
Stored Data: | - |
Web App URL: | https://lamp.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Cost Tracker
Description: Simple Cost Tracker helps you to track your daily costs. You can choose different cost types and show statistics about your expenses. Please read Important Saving Issues to prevent data loss.
Supported Devices: Simple Cost Tracker should run on iPhones/iPads (iOS12.2 or higher, Safari) and Android devices (8 or higher, Chrome, Firefox).
Legal: Simple Cost is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy or function. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://cost.cjpj.de
App Details | |
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Title: | Simple Cost Tracker |
Version: | 3.1alpha - Release Date: 16.01.2023 |
Permission: | Internet connection - link to legal pages (not needed for function) |
Stored Data: | Cost type/date/value using localstorage |
Web App URL: | https://cost.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Solarwinkel
Beschreibung: Simple Solarwinkel (only German version available) berechnet den optimalen Azimutwinkel und Neigungswinkel für Photovoltaik (PV) Solarpanels am aktuellen Standort über Breiten- und Längerad für Datum und Uhrzeit. Die Sonnenstrahlen treffen dann genau rechtwinklig auf die Solarpanel-Fläche. Die Ergebnisse sind ganzahlig gerundet.
Der Neigungswinkel ist der Winkel des PV Solarpanels zum Boden. In der Photovoltaik ist der Azimutwinkel des PV Solarpanels die Abweichung von der optimalen Südausrichtung. Zusätzlich werden die astronomischen Sonnenwinkel Azimut und Elevation berechnet.
Hinweis: Die Berechnungsgrundlagen stammen aus dem YouTube Video 'Berechnung der Sonnenposition' der Fachhochschule Ostschweiz.
Unterst. Geräte: Simple Solarwinkel sollte auf Android Systemen (ab 8, Chrome) und iPhones/iPads (iOS12 oder höher, Safari) funktionieren.
Nutzungsbedingungen: Simple Solarwinkel ist kostenlos. Keine Gewähr für Funktion oder Richtigkeit der bereitgestellten Informationen! Benutzung auf eigene Gefahr. Werte sind gerundet. Weitere Details unter Nutzungsbedingungen (Lizenz) und Haftungsbeschränkung.
Load Web App https://solar.cjpj.de
App Details | |
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Title: | Simple Solarwinkel |
Version: | 0.3 - Release Date: 24.01.2023 |
Permission: | Internet connection - link to legal pages (not needed for function) Genauer Standort (GPS and network-based) |
APIs: | Geolocation API - Positionsermittlung |
Stored Data: | - |
Web App URL: | https://solar.cjpj.de |
OS Licenses: | Simple App Shell under The MIT License (MIT) |
Web App: Simple Unit Converter
Description: Simple Unit Converter converts the most common units. Please use decimal point as decimal separator. Max. input length is 15 digits (with decimal point).
You can also convert the common GPS position values. Position values are always roundet to 6 digits (decimal values) or 3 digits (minute, second values). Button Prefixes shows a table with metric prefixes.
Note: OpenStreetMap is not integrated into this web app. It is only called up as an external website and the position is passed.
Supported Devices: Simple Unit Converter should run on iPhones/iPads (iOS12.2 or higher, Safari) and Android devices (8 or higher, Chrome, Firefox).
Legal: Simple Unit Converter is free of charge. It is provided 'as is', without warranty of any kind. No guarantee for accuracy or function. Use at your own risk. For details please see Terms of Use (License) and Disclaimer.
Load Web App https://unit.cjpj.de
App Details | |
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Title: | Simple Unit Converter |
Version: | 0.1 - Release Date: 14.04.2023 |
Permission: | Internet connection - link to legal pages (not needed for function) and to OpenStreetMap |
APIs: | Open Location Code JavaScript API |
Stored Data: | - |
Web App URL: | https://unit.cjpj.de |
OS Licenses: |
Simple App Shell under The MIT License (MIT) Open Location Code JavaScript API, Copyright 2014 Google Inc. All rights reserved. Licensed under the Apache License, Version 2.0 (the 'License'), http://www.apache.org/ OpenStreetMap under Open Data Commons Open Database Lizenz (ODbL) |
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