PriceHover

PriceHover

Hover any price on any page and read it in your own currency. Chrome and Firefox, MV3, built with WXT and Svelte 5.

Hovering a yen price on a shop page, clicking a tooltip row to copy the amount, then hovering a price range

Release License Stars Browser WXT Svelte

Why

A price in a currency you do not think in costs a tab, a search box and your place in the page. PriceHover reads it where it sits. No account, no paste, one request a day for the rates.

Features

[!NOTE] 2.0.0 changed how $ is read. On a country domain it now converts as that country’s dollar, not as USD. Settings → Behaviour → Read $, kr and ¥ from the site’s country puts the old reading back.

The same $49.99, two shops

The same $49.99 on a .com shop and on a .ca shop, converting to €44 and €31

The country comes from the domain, or from the region in <html lang> when the domain says nothing. Vanity endings (.co, .io, .ai, .me, .tv, .to) are ignored, because the country in them means nothing.

On the page Read as
¥74,800 on a .jp shop 74 800 JPY
¥74,800 on a .cn shop 74 800 CNY
₹1,49,900 149 900 INR (Indian lakh grouping)
KD 12.500 12.500 KWD (three decimals, not thousands)
€10-20 a range, 10 to 20 EUR
try 100 times, requires PHP 8.2, error code 500 KD nothing

Inline mode

A price block with the euro equivalent appended in brackets after each yen amount

Off by default. The site’s own text is never rewritten, only appended to, and text fields, editable areas, code and pre are left alone.

The popup is also a converter

The PriceHover popup converting 250 CHF into a list of currencies

Type 250 chf, 20 usd jpy, or a bare number to convert from your own currency. The footer says how old the rates are and refreshes them on demand.

Settings

The PriceHover settings page: currencies, behaviour, paused sites, about

Your own currency, the list to convert into and its order, hover delay, rounding, inline mode and paused sites.

Privacy

PriceHover contacts exactly one host, open.er-api.com, and asks it one question: today’s exchange rates. That request carries nothing about you or the page you are on. Prices are detected on your machine, flags are bundled in the extension, and there is no analytics, no telemetry and no identifier. Three permissions: storage, activeTab and access to open.er-api.com.

Turning on crypto conversion adds a second host, api.coingecko.com, and nothing else. It is off by default, your browser asks before granting it, and switching it back off hands the permission back.

Full details in the privacy policy.

Install

Build from source

bun install
bun run dev            # Chrome, hot reload
bun run build          # Chrome MV3  -> .output/chrome-mv3
bun run build:firefox  # Firefox MV3 -> .output/firefox-mv3
bun test               # unit tests, plus DOM tests under happy-dom
bun run typecheck      # tsc --noEmit, kept clean and enforced in CI

bun run icons, bun run flags and bun run locales regenerate committed files and never run at build time. A release is cut by pushing a vX.Y.Z tag: CI refuses a tag that disagrees with package.json, builds both targets and attaches the zips.

Contributing

Issues and pull requests are welcome. Keep bun test and bun run typecheck clean, and never add a runtime request to a second host. Detection is the part that breaks quietly: a token accepted one position too freely turns error code 500 KD into a price, so every new one arrives with the case that must stay silent.

License

GNU General Public License v3.0 or later. Use it, read it, fork it. Distributing a modified version, publishing a fork to a browser store included, means releasing its source under the same license. Every dependency is GPL-compatible, and only Svelte (MIT) ships inside the extension.

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