collAnon Simple Gantt is your tool for creating long running events that you want to keep track for how much time they take in terms of days or months, giving a wide view of what is happening throughout your life. More control is also given with the creation of custom categories, so you can visually group many events under a common name. It's a totally offline web app where all the data is stored on your device and it can be easily downloaded or imported. This web app is freemium with no limits for this web app. The premium UserPlus+ status will give you the chance to enable and make online backups of all the data(so you can easily sync different devices with few clicks/taps). This tier starts with 3.50 $/Euro