Personal finance

LucasApp Blog

Practical personal finance notes: budgeting, spending, subscriptions and saving, written by the maker of LucasApp.

savingOctober 3, 20267 min read

Sinking funds: how to save for the bills you already know are coming

Car insurance, the holidays and back-to-school are not surprises. Divide each one by the months left, keep it apart from your emergency fund and skip the card.

spendingSeptember 22, 20267 min read

The latte factor, honestly: what small expenses really cost

Your coffee costs real money, but it is rarely the leak that matters. Do the honest math, find the fees you never notice, and decide with a 30-day method.

debtSeptember 5, 20265 min read

Buy now, pay later: the debt you do not see

Three small installment plans can overlap into a large commitment. See the arithmetic, compare BNPL terms, and track what you owe before your next payday.

debtAugust 29, 20267 min read

Debt snowball vs avalanche: which one pays off faster (with the real numbers)

Snowball or avalanche? Run three real debts through both, see what the avalanche actually saves, and use the decision rule and calculator to pick the order you will stick with.

savingJuly 25, 20268 min read

Emergency fund: how much you actually need (and how to build it)

Your emergency fund is measured in months of essential expenses, not salary. Find your number, decide between saving and paying off debt, and fill it without heroics.

budgetingJuly 3, 20265 min read

The 50/30/20 budget: a simple rule to organize your money

How the 50/30/20 rule splits your income into needs, wants, and savings — with realistic examples, common pitfalls, and how to adapt the percentages to your life.

subscriptionsJuly 3, 20264 min read

Subscription audit: how to audit your subscriptions in 4 steps

A four-step subscription audit: find every recurring charge, decide to keep, downgrade or cancel, and track renewals so forgotten subscriptions stop costing you.

debtJune 29, 20265 min read

How credit card APR works (and how to pay off a balance faster)

How credit card APR works on a revolving balance, why minimum payments keep you in debt, and practical steps to pay off your card faster.

savingJune 29, 20265 min read

How compound interest works (and why starting early matters)

Compound interest turns small, consistent savings into meaningful growth over time. Learn how it works, the rule of 72, and how to apply it to real savings goals.