Can I open-source MonkStreet?
KINDA · partial or early alternativesKinda. Firefly III and Actual Budget cover the core of MonkStreet, but they're early or partial — expect gaps like Point-in-time fundamentals and delisted tickers, so your backtest quietly assumes the losers never existed and Clean handling of splits, dividends, mergers and index reconstitutions.
People pay for a decision, not for code. A signals subscription outsources the part that is actually hard, which is committing to a rule and sticking with it through a drawdown, and it does so with a narrative confident enough to hold onto. There is also the data gap: a paid service can license clean point-in-time fundamentals that a hobbyist cannot, and that difference shows up as backtests that are less flattering and more honest. The uncomfortable part is that from the outside you cannot tell a licensed, carefully validated process from a spreadsheet with good copywriting, and both charge monthly.
xPoint-in-time fundamentals and delisted tickers, so your backtest quietly assumes the losers never existed
xClean handling of splits, dividends, mergers and index reconstitutions
xWhatever research process, however good or bad, sits behind the paid signal
xSomeone else's conviction to blame when a position goes against you
xAny institutional data feed: short interest, filings parsing, tick data, borrow costs
These projects already replace it, free.
FFirefly IIIPersonal finance manager with budgets, rules, and reports — your money data stays home.open source↗AActual BudgetLocal-first envelope budgeting with multi-device sync and bank import.open source↗What each one is, in full: Firefly III · Actual Budget
no votes, no pay-to-list · just what's real
Can I open-source MonkStreet?
Kinda. Firefly III covers the core of MonkStreet, but there are real gaps: Point-in-time fundamentals and delisted tickers, so your backtest quietly assumes the losers never existed, Clean handling of splits, dividends, mergers and index reconstitutions. Read the honest list above before committing.
How much does MonkStreet cost?
MonkStreet costs about $200/month (MonkStreet Annual, checked 2026-08-18), which is $2400 per year.
What do I lose by replacing MonkStreet?
Honestly: Point-in-time fundamentals and delisted tickers, so your backtest quietly assumes the losers never existed; Clean handling of splits, dividends, mergers and index reconstitutions; Whatever research process, however good or bad, sits behind the paid signal; Someone else's conviction to blame when a position goes against you; Any institutional data feed: short interest, filings parsing, tick data, borrow costs. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to MonkStreet?
Yes: Firefly III (Personal finance manager with budgets, rules, and reports — your money data stays home.) Actual Budget (Local-first envelope budgeting with multi-device sync and bank import.)