Many people now use phone apps to track their spending.
Tips
usage
Two related senses: (1) personal/business bookkeeping - 记 'to record' + 账 'accounts'; (2) putting a purchase 'on the tab' to be settled later. The same characters also appear in 记账员 'bookkeeper' and 记账软件 'budgeting app.'
mistakes
账 (accounts) and 帐 (tent / curtain) used to be interchangeable for the 'accounts' meaning, but modern standard usage strictly separates them: financial 'accounts' is always 账, while 帐 is reserved for 帐篷 'tent' and 蚊帐 'mosquito net.' 记账 is the modern form and 记帐 the older variant.
