Every new browser tab opens a live cryptocurrency chart. Track what you hold, read your country's crypto tax rules, practise with no real money, and get told when a price you care about is hit — with no permission asked at install.
Line or candlesticks over six ranges, with a price scale and a time axis. Drag it any way — sideways through time, up and down through prices — scroll or pinch to zoom where you point, and finer candles load as you go in. A log axis, an average that says what it covers, US inflation releases marked where they fall, and every point readable from the keyboard.
Lines, trend lines, rays, boxes and notes that stay with the coin at their price and time. A ruler that says the change, the time and how often a move that far happened in that long. A line can become a price target.
Volume by price, where the price sits in each range, the usual range ahead as a cone, regimes and the levels where it has turned. Each was tested on years of history first, and each says what it counts — never what comes next.
Another coin, the S&P 500, the Nasdaq 100 or gold, from a drawer beside the chart. Both drawn as percent change from the same moment on one shared axis, with the gap, how often they stepped the same way and how closely they moved — so where the lines cross is where the market put them.
Sixteen chart patterns — head and shoulders, triangles, wedges, ranges, flags — twelve strategy setups and twenty-one readings such as divergences, the Ichimoku cloud and Fibonacci retracements, named where they appear. Each sits beside what followed it on this coin and how it did when tested on four coins. Counted, never scored.
The right of the chart becomes a board of squares — real price bands at real moments ahead, each with its chance, worked out from the coin's own history and checked against years of past squares before it was allowed on. Drag the board to look further, click a square twice, and it settles itself: called it, or missed. The score is local, worth nothing, and never leaves.
"BTC rises above 80,000", or "BTC falls 5% in 1h, 4h or 24h". Reported next time you open a tab — even a move that happened and reverted overnight — and, only if you switch it on, as a Chrome notification.
Holdings by amount, or a public address read for its balance. Dated purchases, sales and income; cost basis by FIFO, LIFO or HIFO; the return month by month. Press H and the amounts are masked.
The crypto tax rules of 244 countries and territories — what is taxed and what is not, the rates, the tax year — each read from the country's own tax authority or law, linked and dated. Where none was confirmed, it says so. Not tax advice.
A perpetual-contract terminal priced from a real venue's public quotes: long or short up to 200x, stops, limit orders, funding and liquidation. Settled in Practice Units that cannot be bought or cashed out — no real money, ever.
Fourteen sources, filtered to your coins or your holdings, with advertising kept out and one story written up four times shown once. Click a headline and the story opens beside the list without its pictures, with a reading of it: what kind of story its words make it, the coins and figures it names, and what the chart did since. Counted, never judged.
What followed every past time this coin entered the state it is in now — with the count behind every figure, and no comparison at all below twelve episodes. It opens on what came after everything true right now, and lists the twenty past stretches most like the last month with what followed each. What got built instead of buy and sell signals.
Fear & Greed, market overview, halving, difficulty, fees, gas, RSI, funding, open interest, liquidations, long/short, alt season, regimes, watchlist, top movers and more. Add them from a gallery at small, medium or large — a bigger card shows more — hold one for its size, and pin up to four to the home screen, where they rest as outlines.
81 coins, 37 currencies, 13 languages, dark / light / auto, blue and orange for colour-blind eyes, four modes, and a keyboard shortcut for everything — its letter on every tab, or hidden if you prefer. Press ? to see them.
A widget that gives Bitcoin's next hourly close as a band and a median, and a price target's chance of closing above it — from a volatility model fitted on years of hourly closes and tested on the twenty-one months it never saw, where 77.8% of hours closed inside its 80% band. It says that, and keeps its own score on your device.
PriceTab asks for no browser permission at install. No account, no analytics, no telemetry. Your coins, settings, portfolio, targets and practice account live in your browser's local storage and never leave the device — which is also why they don't follow you to another computer, unless you carry a backup file there yourself.
Prices come from public, keyless market APIs. The one thing that leaves the browser beyond a request for market data is a wallet address, and only if you paste one in to watch its balance — then it goes to that chain's balance provider and nowhere else. Checking it against the sanctions list happens on your device, from a list that ships with the extension. Two things are optional and off until you press a button inside the app: a Chrome notification for a hit target, and eight newsroom feeds.
It also means a target can only be checked while a PriceTab tab is open. Nothing runs in the background when your browser is closed: there is no background worker to run it.
A browser extension can read every page you open, so being suspicious of one is the correct instinct — including of this page, which is marketing. Below is the part that isn't: the manifest Chrome enforces, every host the code can reach, and three checks that take a minute each.
{ "manifest_version": 3, "name": "PriceTab - Crypto Charts on Every New Tab", "version": "1.5.0", "default_locale": "en", "description": "Every new tab opens a live crypto chart…", "chrome_url_overrides": { "newtab": "index.html" }, "permissions": [], "optional_permissions": ["notifications"], "optional_host_permissions": ["https://cointelegraph.com/*", … eight newsroom feeds], "action": { "default_popup": "popup.html" }, "icons": { "16": …, "48": …, "128": … } } // Eleven keys. "permissions" is empty, and the two optional lists // are granted only when you press a button inside the app. There is no // "host_permissions", no "background" and no "content_scripts".
src/api.js and src/widgets-data.js.
(A third, src/i18n.js, reads a language file from
inside the extension itself.) The source contains no
XMLHttpRequest, no
sendBeacon, no eval, no
document.cookie, and no analytics SDK of any kind.
| Host | What for | What is sent |
|---|---|---|
| www.coinbase.com | Prices and chart history; exchange rates for non-USD | Coin symbol, currency code |
| api.exchange.coinbase.com | Candles for the crosshair and candlestick chart, and the daily history the base rates and the chart companion count | Trading pair, granularity, a time range |
| api.kraken.com | Coins Coinbase doesn't list (Monero among them), long-range candles, a fallback while Coinbase is not answering, and the S&P 500 and Nasdaq 100 for a comparison, as Kraken's tokenized ETFs | Trading pair, interval |
| api.coinlore.com | One bulk snapshot feeding the ticker, watchlist, top movers and price-only coins; the market overview | Nothing — a fixed top-100 request |
| api.alternative.me | Fear & Greed index | Nothing |
| www.okx.com | Funding rate, open interest, liquidations; the perpetual's price, candles and order book while the practice page is open | Coin symbol |
| api.bybit.com | Long/short ratio; the practice page's market readings; delisting and network-upgrade notices if you switch them on | Coin symbol |
| mempool.space | Halving, fee, mempool and difficulty cards; Bitcoin address balance | Only an address you paste in yourself |
| api.blockchair.com | The “what happened here?” news archive; ETH/LTC/DOGE/BCH/ZEC address balance; the four Bitcoin network cards when mempool.space cannot be reached | A date range; only an address you paste in yourself |
| ethereum-rpc.publicnode.com | ETH gas; ERC-20 token balances | Nothing for gas; only an address you paste in yourself |
| hn.algolia.com | Hacker News stories for the news panel | A fixed search term, or a date range |
| search.cnbc.com feeds.content.dowjones.io news.bitcoin.com cryptopotato.com | The news feeds that need no permission; a CryptoPotato story's text when you open it in the preview | Nothing — a request for a public feed or for the story you opened |
| www.coindesk.com www.theblock.co cointelegraph.com decrypt.co cryptoslate.com bitcoinmagazine.com coinjournal.net feeds.bbci.co.uk | Eight optional newsrooms — never contacted until you grant them from the news panel; once granted, a story's text when you open it in the preview | Nothing — a request for a public feed |
chrome://extensions, find PriceTab, click
Details. The permissions list is empty, and there is no "service
worker" link because there is no background page.
grep -rln "fetch(" src/ returns three
files: the two above, and the language loader, which only reads
from the extension's own folder.
Click "Add to Chrome" — no sign-up, nothing to configure.
Open a new tab. Your live chart is already there.
Click the price to switch coins, or open settings to make it yours.