Financial simulation, explained
A financial simulator creates money screens that look real but are entirely fictional — balances, transactions, net worth, portfolios — for content, design mockups and teaching. No real accounts, no real money. Here's what that actually means, and why a simulated number is useful in the first place.
What "financial simulation" means
Simulation is just modelling something without the real consequences. A flight simulator looks and behaves like flying a plane, but you're never actually airborne. A financial simulator does the same for money screens: it reproduces the look and feel of a banking or investing app — the big balance, the transaction list, the portfolio chart — while every figure is made up and nothing is connected to a real account.
That's the whole concept. A simulated balance of $4,000,000 isn't a claim that you have four million dollars. It's a stage set. The number is a prop you placed there, the same way a film set has a "bank vault" that's plywood and paint.
Simulation vs a real banking app
The two can look almost identical on screen, which is exactly the point — and exactly why the difference matters. Side by side:
- A real banking app connects to a financial institution, reflects money that actually exists, and can move it. The number changes because real transactions happened.
- A financial simulator connects to nothing, reflects money that doesn't exist, and can't move anything. The number changes because you typed a different one.
We wrote a fuller breakdown of this in Entertainment vs real banking apps, but the one-line version is: a real app is plumbing connected to the financial system; a simulator is a drawing of that plumbing.
If an app can take money out of your life, it's a real financial product. If the worst it can do is render a fake number, it's a simulator.
Where the numbers come from
This is the question people ask most, and the answer is refreshingly boring: the numbers come from you. In a simulator like Larped, you type the balance, you add the transactions, you set the portfolio's holdings and daily moves. There's no data feed, no market connection, no bank handshake happening in the background. The app's job is to take the figures you invent and render them into a screen that looks like the real thing.
That's an important design property, not a limitation. Because the only inputs are the ones you choose, a simulator has nothing sensitive to protect — there's no real account behind it to leak. It's one reason simulation is genuinely safer than the old workarounds people used (filming a real banking app, or trying to fake one in a photo editor with real screenshots as a base).
What simulated finances are good for
"Fake money screen" sounds frivolous until you list the legitimate reasons people need one:
- Content & comedy. Skits, "day in the life," reaction videos, parody of finance culture — anything that needs a number on screen without exposing a real account. (See how creators use Larped.)
- Storytelling & film. A character checks their balance and panics; a heist crew sees the payout land. Props, basically.
- Design mockups. A designer demoing a fintech concept needs realistic-looking screens with no real customer data in them.
- Education. Teaching budgeting, saving or investing is far clearer with a believable example account than with abstract slides — and far safer than showing your own.
- Personal motivation. Some people just like seeing the goal rendered. A simulated "target net worth" screen is a vision board with a UI.
What makes a simulation believable
A simulated screen only works if it reads as real at a glance. After building a lot of these, we've found the believability lives in the small stuff:
- Consistent numbers. If the transactions don't roughly add up to the balance, the brain notices. Good simulators keep the maths coherent.
- Realistic detail. Sensible timestamps ("Today, 10:24"), normal merchant names, a masked card number — texture sells it.
- Restraint. A clean layout beats a cluttered one. Real finance apps are minimal; your simulation should be too.
- Round, but not too round. $10,482,300.00 feels more real than $10,000,000 — a little specificity goes a long way.
We tuned Larped's screens around exactly these principles, because a prop that doesn't convince isn't worth filming.
How Larped does it
Larped is a purpose-built financial simulator for mobile. You pick a screen type — bank balance, net worth dashboard, or investment portfolio — set your figures, add a few transactions for texture, and screen-record the result. It never connects to a bank, never handles real money, and labels itself honestly as entertainment. In other words, it's simulation done on purpose, for the people who actually need it.
See a simulation in your own hands
The fastest way to get it is to build one screen. Get Larped and set your first fictional balance.