Open Source Currency Converter review
A focused, open-source Chrome tool for converting prices directly within webpages.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Open Source Currency Converter is a Manifest V3 Chrome extension for shoppers and other desktop users who need to interpret foreign prices while browsing. It detects currency symbols, ISO codes and currency names directly on webpages, then converts amounts without requiring a separate converter tab. Hybrid mode can convert detected prices across a page and offer selection tooltips, while interactive mode converts selected currency text without changing the page.
Its strongest differentiator is coverage of difficult webpage content. The extension supports US, European, Indian and Swiss number grouping, negative amounts, refunds and compact values, and it can process prices inside embedded frames and open shadow roots. Site-specific disabling and animation controls provide per-site behavior settings. Exchange rates come from the European Central Bank on a daily refresh schedule, with rates cached locally for offline use. Settings can synchronize through Chrome storage, keeping the tool aligned with its browser-based workflow.
The project is open source, released under the MIT License, and offers a free plan. That makes it suited to solo users and small teams seeking a focused webpage conversion utility rather than a broader currency platform. Its Chrome-only deployment and browser-specific interaction model will be limiting for people who need mobile, desktop-native or multi-platform conversion. Daily ECB updates also may not fit decisions requiring intraday rates, while documentation is the listed support channel. Choose it for in-page shopping and research; consider a broader converter when you need wider platform coverage or more frequent rate updates.
Open Source Currency Converter pros and cons
- Where it wins
- Detects symbols, ISO codes, names and varied number-grouping formats
- Converts embedded frames and open shadow roots
- Caches daily ECB rates for offline conversion
- Where it doesn't
- Chrome extension scope limits use to browser-based workflows
- Daily rate refreshes may not suit intraday exchange needs
- Documentation is the listed support channel
Open Source Currency Converter fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update