*KREZUS*
Your portfolio. Your data. Your browser.
KREZUS is a free, open-source investment tracker for UK investors. Track silver, gold, bonds, stocks and crypto, see your allocation and results, and keep everything in your own browser.
Everything in one journal
Five tabs, one clear picture of what you own and how it is doing.
- Portfolio
- Positions, average purchase price, current value and result in one table, with GBP as the base currency.
- Transactions
- Record purchases and sales, with quick shortcuts for dividends, interest and Premium Bonds wins, and optional fees.
- Allocation
- See your portfolio by asset class on the Start tab, and by holding and account type (ISA, Lifetime ISA, SIPP, GIA, NS&I) in the allocation views.
- History
- Save valuations over time and follow portfolio value against the amount invested. A change log shows what moved.
- Reports
- Period summaries by calendar year or UK tax year, from 6 April to 5 April.
- Prices and currencies
- Update prices by hand, or add your own Twelve Data key for automatic quotes. Rates for PLN, USD and EUR refresh automatically.
Built for UK investors
- Stocks & Shares ISA
- Lifetime ISA
- SIPP
- GIA
- NS&I
- £ GBP
A ready catalogue saves typing: Vanguard UK funds and ETFs, Royal Mint DigiGold and DigiSilver, bullion coins, NS&I Premium Bonds, Bitcoin, Ethereum, XRP and Solana.
The CGT report groups disposals by tax year, applies your annual exempt amount and treats ISA, Lifetime ISA, SIPP and NS&I as exempt. It is an indicative guide, not tax advice: it uses average cost and ignores the same-day and 30-day rules.
Your data stays on your device
No sign-up, no server copy of your portfolio.
- No account, no cloud
- KREZUS never sends your portfolio to its own server. Holdings and transactions stay in your browser. It requests exchange rates by currency code from Frankfurter and, if you switch on automatic prices, sends symbols and your own API key to Twelve Data.
- Optional PIN
- A 6-digit PIN encrypts the data in your browser and your backups. It deters casual viewing, and there is no reset, so keep a backup. A saved Twelve Data API key is kept locally and is not encrypted by KREZUS.
- Backups are yours
- Export to a JSON file whenever you like and restore it on any device. KREZUS never uploads backups. Clearing browser data erases the saved copy, so back up regularly.
- Optional website analytics
- Google Analytics 4 measures website visits only after you accept. It is separate from portfolio storage. You can change your choice using Cookie settings at the bottom of the screen.
Start in three steps
- Download the fileDownload KREZUS, unzip it and open KREZUS.html in any modern browser, or open it here online.
- Add your first assetPick it from the UK catalogue or enter your own, with quantity and price.
- Record and reviewAdd transactions and valuations over time. KREZUS calculates the rest.
Questions
Is KREZUS really free?
Yes. KREZUS is free and open-source under the MIT licence. The licence text is linked in the footer.
Does KREZUS give investment advice?
No. It is a record-keeping tool. It does not execute trades or provide investment or tax advice.
Where is my data stored?
In the browser you use, for the address you opened it from. A copy opened from krezus.app and a downloaded copy opened from your disk keep separate data, so use a JSON backup to move between them.
Does it need internet?
The file runs in your browser. Internet is only used for exchange rates (Frankfurter) and optional automatic prices (Twelve Data, with your own API key).
Which languages are available?
English and Polish. You can switch at any time inside the app.
Try it with a few sample entries
KREZUS is still being polished. Tell me what works and what could be better.