Twenty upvotes doesn’t sound like much, until you see what’s sitting behind them: a full open-source finance brain for ChatGPT.
The build is called AI CFO Skills, and it’s free. The creator, a Redditor going by u/rohasnagpal, put together an open-source library of finance skills. It’s built for founders, finance teams, consultants, and anyone tired of guessing at their own numbers. It landed on r/ChatGPTPromptGenius this week, and the replies confirm people are already testing it on real financial data.
What’s new
Here’s the shift. Instead of typing a vague prompt and getting a vague answer, you feed ChatGPT your actual financial data. A P&L, a cash ledger, whatever you’ve got. Then you ask real business questions, the kind that used to mean a call with your accountant.
“Why is cash falling even though revenue is growing.” “How many months of runway do we have.” “Can we afford to hire 15 more people.” “Which customers are actually profitable.” The post lists a dozen more, including “prepare a board finance pack” and “compare three pricing options.”
The library gives ChatGPT a toolbox of specific finance skills to reach for: cash flow analysis, customer profitability, margin breakdowns, pricing comparisons, fundraising math. It’ll even dig up weird transactions buried in a ledger, or tell you whether an expansion actually makes financial sense before you commit to it.
The twist
You don’t pick which skill runs. ChatGPT does. The AI CFO figures out which finance skill the question needs. It runs the analysis, checks its own numbers, and hands back an answer you can actually act on. No wall of finance jargon. That’s the part that got me!
Most finance tools make you already know what you’re looking for before you start. This one works backward from a plain question, which is exactly how a founder who isn’t a finance person actually thinks. You’re not learning a new interface or picking a report type from a dropdown. You’re just asking, the way you’d ask a person.
That’s a different approach than the usual “act as a financial analyst” prompt everyone’s been copy-pasting for two years. A single mega-prompt tries to do everything with one instruction and quietly guesses at the rest. A library of separate skills means each answer comes from logic built for that specific question, not a generic template stretched to fit.
How to try it
- Grab the library from GitHub, the link sits inside the original Reddit thread.
- Feed it your P&L, cash ledger, or transaction data.
- Ask a plain business question. No formulas, no spreadsheet gymnastics.
- Let it pick the skill and run the analysis, then push back if a number looks off.
Pro tip
Don’t stop at one question. Ask “why” a second time. The original post shows prompts like “why are margins getting worse” pulling real answers. But the second “why” is usually where the useful stuff shows up, the actual driver behind the number instead of just the number itself.
One commenter on the thread joked that if you can’t afford to hire a CFO, this answers the hiring question for you. Fair point, honestly. Another simply said “thank you,” which tells you the questions in that list are hitting a real nerve for people running lean teams.
Worth mentioning: this is still an open-source project built by one person, so treat the output the way you’d treat a junior analyst’s first draft. Check the numbers before you act on them, especially anything tied to a real hire, a real raise, or a real expansion decision. The tool says it checks its own math, but you’re still the one signing the check.
It’s also worth being clear about what this doesn’t replace. It won’t file your taxes, negotiate your term sheet, or sit in the room when the board asks hard questions. What it does is compress the first hour of financial digging down to a few minutes. That’s the part where you’re just trying to understand what the numbers are telling you.
There’s no signup, no paid tier, no dashboard to learn. It’s a GitHub repo you point ChatGPT at, and that low barrier is probably why it’s already spreading past one subreddit.
It also scales past the basic questions. Founders can use it for runway and hiring math. Finance teams can lean on it for board packs and margin breakdowns. Consultants can run it across multiple clients without rebuilding a template each time. Same library, different depth depending on who’s asking.
Go read the full thread on r/ChatGPTPromptGenius and grab the repo yourself. It’s the kind of five-minute rabbit hole that actually pays for itself. 🚀
Turn ChatGPT into your own CFO
by u/rohasnagpal in ChatGPTPromptGenius