Why CoinROI
Identifying a coin and understanding its value means checking its type, condition and available references. CoinROI helps you organize that information and consult indicative values, keeping visible what is suggested, verified or not.
How it works
Follow the guidance shown on screen.
Country, year, denomination, metal or mint: verify these before relying on them.
Metal prices, listing asking prices, catalog values: the source and, when available, the date are shown. These are not guaranteed sale prices.
What CoinROI does
- Search references in the Numista catalog (CoinROI is an independent app, not affiliated with Numista)
- Organize your collection: photos, subcollections, filters
- Track your buys and sells
What it doesn't do
- Guarantee authenticity, condition or sale price from a photo
- Replace a professional numismatist
- Offer a subscription
Price
- Download, photography and collection organization: free
- Pay-as-you-go, no commitment: buy credits only when you have new scans and coins to add. They never expire. Packs from $0.99, prices shown before purchase in the App Store.
- Advanced: have an OpenAI or Anthropic account? Use your own key and pay your provider according to their rates
Made in France
CoinROI is developed and maintained by one person in Castanet-Tolosan, near Toulouse. Built for French and European collectors: French and overseas issues, euro coins, inherited collections. Young app: questions, feedback and suggestions are welcome — you will get a direct answer.
Contact: contact@obviousidea.com
FAQ
How can I check what a coin is worth with my phone?
Photograph the coin: the app suggests identification leads, then indicative reference values with their sources when available. A photo does not guarantee authenticity, condition or sale price.
How much does it cost?
Free to download. Some analyses and searches use pay-as-you-go credits; no subscription. With your own API key, your provider's rates apply.
What happens to my photos?
They stay on your device. When you run a paid analysis, the image is sent to the chosen AI service for processing. See the privacy policy.
What is the difference with Numista?
Numista is a community catalog. CoinROI is an independent app that can search it from inside the app, and adds scanning, organization and collection tracking.