Every product has an origin story. Mine is short: there was a picture in my head of how money should work, and nobody had built it.
I'm a finance analyst by profession. I've spent years inside large corporations doing the work that keeps a company financially strong — cash flow forecasting, variance analysis, the unglamorous machinery that answers one question over and over: where will we be, and what do we do about it today?
Here's the thing nobody tells you about big companies: they almost never get surprised by money. Not because they have more of it — because they look forward. No CFO on earth runs a company off a chart of last month's spending. A company that only tracked where money went would be described, politely, as flying blind.
Then I'd go home, open my own banking app, and fly blind.
Bringing it home
So I brought the discipline home. The same way I'd forecast a company's cash, I started forecasting my own — in a spreadsheet, the analyst's reflex. What's coming in, what's committed, where every month would land before it started. And when something drifted off plan, catching it while it was still small. Variance analysis sounds corporate; at home it's just "groceries are running hot this month — fix it now, not on the 28th."
I ran my money that way for two years. It worked — not "worked" like a budgeting streak works; worked like it works for companies: no surprises, no scrambles, no discovering a problem three weeks after it became one. The only problem was me. I was the spreadsheet's engine, and the engine had a day job.
The app I went looking for
What I could never find was an app that did it for me. Everything on the market had a piece. Beautiful records of the past — where the money went, never where it's going. The occasional forecast widget — one static number, no explanation, no way to ask what's inside it. And lately, AI chat bolted onto everything — apps happy to talk about your money, with answers grounded in nothing. Confidently wrong is worse than silent.
Nobody had built the thing every company takes for granted: the real flow, the real ending balance, and someone who does the math before speaking.
So I automated it
So I automated it — built the app version of my own system, for an audience of exactly one. And then I did the thing that actually made Marvin what it is: I lived in it. Year after year, my own salary, my own bills, my own mistakes. Every rough edge I hit got fixed, every question I couldn't ask became a feature. Most apps meet their first real user at launch. Marvin's first user was its harshest one, for years.
Somewhere along the way, the question changed. Why should I be the only one who gets this? Companies look ahead so they can make better decisions — people deserve the same.
Because here's what those years actually felt like: no surprise moments. Not one. Marvin showed me the whole highway, not just the stretch behind me — there's a speed breaker two months out. There's an alternate route. Don't take that one. I could look at a month one or even two years away, see it was going to be tight, and start putting a little extra aside long before it arrived. By the time the tight month showed up, the cushion was already built. That's not discipline or luck — that's just being able to see.
Budgeting and expense tracking are great — solved problems, table stakes. The part that isn't solved is the part that actually changes outcomes: seeing where you're going to be, and catching today's mistake while it's still today's — before it becomes next month's shortfall.
In Marvin Money, today sits at the hinge of one timeline. Scroll left, you see where the cash actually went — every receipt read and sorted. Scroll right, you see where you're headed — every salary, bill, and planned expense stacking into a projected balance for each week ahead. And when you ask Marvin a question, he reads your actual balance, your actual bills, your actual patterns — runs the math first — and then answers. It's the corporate treasury meeting, minus the corporation — and minus the suit. Just a friend who's good with money.
Why it matters
Nobody should run out of money because they couldn't see it coming. That's the whole mission. The difference between a rough month and a disaster is usually one decision, made a few weeks earlier, by someone who could see around the corner.
Companies have had that for decades. Now you do too. It's ready — take control of the future.
More on how the forward half works — read your personal cashflow intelligence and budget variance, made personal.