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JStock vs MarketMonk: catalog facts
JStock	MarketMonk
Free Free open-source software supported by donations.	Free Free and open source under the MIT licence.
Windows, Android	Android
Covers 28 stock markets Portfolio tracking with net worth calculation	Portfolio holdings and performance in one dashboard Price charts from Yahoo Finance data
Market data depends on what the app can fetch for each exchange Interface is a traditional desktop application	Depends on Yahoo Finance for market data A tracker only, with no trading or brokerage features
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.