Arithmony was born from a simple frustration: budgeting tools are either too rigid or too chaotic. We set out to build something different — elegant, precise, and genuinely useful.
Most people don't struggle with money because they lack discipline — they struggle because their tools don't give them a clear enough picture of what's actually happening.
Arithmony applies the discipline of mathematics to personal finance. Not just numbers on a screen, but structured thinking — categories that make sense, patterns that reveal themselves, and goals that have real paths to completion.
We believe that when you can see your financial life with precision, good decisions become obvious. The math does the heavy lifting. You get the clarity.
Precision over approximation
Every dollar accounted for. No rounding, no guessing, no "close enough."
Structure enables freedom
The clearer your budget, the more confidently you can spend within it.
Beauty matters
A tool you enjoy using is a tool you'll actually use. Design is not decoration.
Privacy by default
Your financial data is yours. We never sell it, we never use it to serve you ads.
"Spreadsheets are powerful but painful. Apps are easy but shallow. We wanted both — the rigor of a spreadsheet and the elegance of great software."
The status quo
Powerful but brittle. One bad formula and everything breaks. No bank sync, no automatic categorization, and no way to share across devices without a headache.
The other extreme
Most budgeting apps track your spending automatically — then show you a pie chart of how you already failed. They report on your past without helping you shape your future.
The Arithmony way
We give you the rigour of a well-designed spreadsheet with the ease of a modern app. Automatic bank sync. Intentional budgeting. Real-time clarity on where you stand.
Connect your accounts
Link your bank accounts securely via Plaid. Transactions flow in automatically — no manual entry required.
Structure your budget
Set intentional spending limits per category. See exactly how much runway you have before month's end.
Track your progress
Watch your net worth grow with editorial-grade charts. Understand your financial trajectory at a glance.
Hit your goals
Set savings targets with deadlines. Arithmony calculates exactly what you need to set aside each month.
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No hidden fees. No dark patterns. No upsells disguised as features. What you see is exactly what you get, and exactly what you pay for.
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You're sharing your financial life with us. We treat that as the extraordinary responsibility it is — never selling your data, never monetizing your attention.
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Every pixel, every interaction, every word is considered. We believe that software made with care produces outcomes with care.
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We're not optimizing for the next quarter — we're building a tool people will use for decades. That shapes every decision we make.
We're a small, independent team who believe the best financial tools haven't been built yet. No venture pressure, no growth-at-all-costs. Just a relentless focus on building something genuinely useful.
The Founder
Product & Vision
Frustrated by every budgeting app on the market and armed with a spreadsheet that had become unmaintainable. Decided to build the right tool.
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