The practice of giving gratuities aka tip mostly relates with culture and society. Tipping customs vary greatly from country to country, with some cultures expecting generous tips while others considering it unnecessary or even inappropriate. When traveling, it is important to be aware of these cultural differences to avoid inadvertently offending someone by over-tipping or not tipping at all.
In the United States, tipping is a common practice. In European countries like France and Italy, tipping is often included in the bill as a "service charge," however, it is still common to round up the bill as appreciation. In Australia, tipping is generally not expected. In Brazil, South Africa, a 10% tip is common. In contrast, some countries, in Japan, South Korea and China, tipping is not expected, and can even be seen as inappropriate.
Overall, tipping customs vary greatly from country to country, when visiting a country, understanding the tipping customs of the country is important to show respect for the local culture and customs.
App don't provide information about tipping practices in various countries, however help to quickly calculate tax, tip based on user selection, and allow to split if attend functions in groups