Itineraries
These are day-by-day routes you can follow as they are, or use as a starting point. Each day groups places that make sense together. In the Srilor app you can plan your own free: Plan my trip lays it out as towns to sleep in, with the nights in each.
The short answer
Srilor's itineraries are ready-made, day-by-day routes through Sri Lanka. Start with the cultural triangle in four days, the hill country by rail in five, or the south coast slowly over a week. All three are ready-made routes in the Srilor app too, or let Suggest a plan draft your own towns and nights, free.