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Revolut, the self-professed 'all things money' app, certainly hides any hesitation about diving into new markets.
You can trade crypto and stocks, buy pet insurance, exchange currencies, organise your bills, send invoices and they even have a chrome extension for automatically applying coupon codes in online checkouts.
One of the criticisms I published in 2020 about Revolut was that their app—which was once simple—has been rapidly growing in complexity. And because of that, their UX has suffered in recent years.
Revolut Junior is yet another departure from the ordinary: a banking app for children.
In principle, and if used correctly, it may genuinely help children to build healthy financial habits. And when you get into the weeds, there's a lot to love about it.

A behind the scenes look at how I redesigned the Built for Mars sign-up flow, and iterated from early feedback.
The two "obvious" fixes that did nothing
Why you shouldn't always force an input
Why limiting the user's choices can be beneficial
Hinge built its reputation on a single promise: it's the dating app that wants you to leave. This is a breakdown of how the interface is actually engineered to make sure you don't.
How dating apps keep you engaged (not romantically)
The design equivalent of clickbait headlines
How Hinge leverages social scarcity
The challenge for a navigation app isn't to efficiently show you the best route, it's to make you believe that you've found the best route.
How strategy influences design
Waze is cornered, and slowly shrinking
What Apple's strategy appears to be

From rat mazes to coffee apps: why the motivation to reach a reward increases the closer your users get to their goal.
How to use the Goal Gradient Effect
Spinning the flywheel of purchases
Why your rules need to be clear
Sometimes, the best onboarding is no onboarding, and simple products get bogged down with unnecessary explanations. This case study on Waitrose, Sainsbury's and Asda demonstrates when to just let the user try it for themselves.
Sometimes the best onboarding, is no onboarding
“Show, don’t tell” often beats education
Data can’t always tell you when onboarding is wrong

An analysis of Monzo’s 1p challenge, focusing on the middle slump, where progress slows and motivation quietly fades.
Delight can replace progress, but only temporarily
"The middle" is the real retention problem
Motivation needs contextualised reference points