Skooless – Swipe through 5-min micro-lessons instead of TikTok (PWA)
TikTok for learning, but lesson quality and retention unclear without trying it.

Clean finance microlearning when Mint, YNAB, and countless apps already exist.
Personal finance beginners, mobile learners, international users
Mint · YNAB · Acorns Learn
TikTok for learning, but lesson quality and retention unclear without trying it.
Structured voice lessons with persistent memory beat freeform chat tutors.
157 calculators but Google already does most of these better.
Immediate, no-friction calculators in Portuguese — IMC, juros compostos, juros simples and 70+ more — with instant results, a theme toggle and an articles/news section. It’s useful and accessible, but ultimately derivative; to feel more than another utility hub it needs exportable outputs, transparency about formulas, or an API for integrations.
German tax calculations with self-hosting when QuickBooks ignores Germany.
Visualizes kanji structure as a recursive DAG when WaniKani only uses static mnemonics.