Built for a problem I actually had.

Stang is made by Au-Rin, a developer based in Singapore, under SMBee.

I live and work in Singapore. My hometown is Bangkok. That means a lot of trips back and forth — and it means my money has never lived in one currency. I earn in Singapore dollars and spend a meaningful part of my life in Thai baht, with the occasional third currency thrown in by a flight or a subscription.

Every budgeting app I tried assumed that was a temporary condition. They were built either for one currency and one country, or for a trip — something with a start date, an end date, and a going-home at the end. Neither describes my life. There is no trip to close out. Bangkok is not a holiday.

So the honest version of Stang's origin is unglamorous: I built the thing I needed, used it myself for a long time before anyone else did, and eventually it was good enough to hand to other people.

Why the features are the features

A few things in Stang look odd next to other budget apps until you know where they came from.

A home currency plus several secondaries, not a trip. Because the currencies are permanent. I needed SGD and THB to both be normal, not for one of them to be an exception I open a trip for.

Typing one sentence to log something. Because logging happens standing at a counter in Bangkok with one hand free, not sitting down with a form. If it takes more than a few seconds it does not happen at all, and an expense tracker with gaps in it is worse than none.

Counting days per country. This is the one that comes most directly from my own life. Moving between two countries regularly means the day count stops being trivia — visas turn on it, and so does tax residency. I did not want to check in anywhere or hand over location tracking to get that number, and it turned out I did not have to: if you paid for lunch in Bangkok, you were in Thailand that day. Your spending already knows. That became Stays.

What this means for the guides

The guides on this site cover tax residency and day counting, which is a topic where being confidently wrong is genuinely expensive for the reader. They are researched against primary sources rather than written from memory, and where a rule is contested or a widely repeated figure is wrong — like Thailand's threshold being 180 days rather than 183, or the 2024 remittance change still sitting in draft — they say so.

I am a developer who lives this problem, not a tax adviser. The guides explain how the rules generally work so you know what questions to ask. For anything that turns on your specific situation, pay a professional — that advice is in the guides too, and I mean it.

How Stang makes money

Subscriptions and one-off lifetime purchases, and nothing else. Stang does not sell data, does not show ads, and does not connect to your bank to harvest transactions. The privacy policy is short and says what it does.

The free plan is a real product rather than a trial: unlimited expenses, no history limit, multi-currency, budgets and CSV export. Your data exports on any plan, because an expense tracker that holds your history hostage is not one you should trust with years of it.

If something here is wrong, or Stang is missing the thing you need, my inbox is hello@smbee.me. It is me who reads it.