Project:Open-Prices

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The goal of this project is to store prices of food products and to make them available to the public, through a REST API and web interface.

The data is licensed under OdBL 1.0, images (proof) are licensed under CC-BY-SA 4.0.

Important links & documents

Data sources

We currently consider the following price data sources:

Caption text
Source Type Addition method Details
Receipts & price tags Crowdsourced Web or Mobile Filling in a simple form. With a proof (either a store receipt, or a picture of the product(s) with its price tag(s))
GDPR requests Crowdsourced API Obtained through GDPR request to stores (fidelity cards :)
Shop imports Retails API Provided directly by retailers
Web extension Crowdsourced API Current status: just an idea

Crowdsourcing the data collect has the advantage of mobilizing the community around the project and of getting traction and visibility. We want to reach a critical mass of data to make the project useful, and we think that crowdsourcing is the best way to achieve this goal. Scan parties in stores can be organized to collect data.

We currently don't allow scraping as a data source for a first version, as it bears some legal concerns and technical challenges to overcome:

  • the database protection law in Europe may prevent us from extracting the price from the website, if we don't have the authorization of the website owner
  • the price can be different depending on the user selected store. Furthermore, some retailers (in the UK for example) start to adapt their prices depending on the user profile (if they are identified as a regular customer, or if they are a new customer). This makes it difficult to have a consistent price for a product.

Current status

Tech Stack

The project is deployed on https://prices.openfoodfacts.org. It is built with:

Name (& link) Technology Code Extra info
Backend Python FastAPI Django API https://github.com/openfoodfacts/open-prices
Frontend Javascript Vue.js 3 + Vuetify https://github.com/openfoodfacts/open-prices-frontend

OFF integrations

Name (& link) Description Code Extra info
Mobile integration Integration in the official OFF mobile app https://github.com/openfoodfacts/smooth-app
Openfoodfacts-explorer

We're not displaying the price on Open Food Facts website yet, as it has to be thoroughly considered first (the website attracts a lot of traffic).

Known re-uses

Name (& link) Description Code Main contributor
Location map A world map of all the contributions in Open Prices Damien M
Price of carrots Simple price index of fruits and vegetables (in french) https://github.com/TTalex/leprixdescarottes Alex B
Do you want your receipt? Comparison between 2 shops https://github.com/qloridant/shop_prices_comparaison Quentin L
Price graph

Challenges

  • On receipt images, there may be some personal data (name, fidelity card number, etc.). We need to find a way to remove this data before publishing the image.
  • Find a way to collect efficiently prices (probably through a mobile app)

🎯 Roadmap

Usage ideas

Description Usage
For a given product, price trends
For a given product, price comparison between stores
For a given product, price comparison for the same store chain (geographic price differences)
For a given product, list of stores where it is sold
Better compare similar products (in addition to Nutri-score, NOVA & Eco-score) - price per kilo - Should I take the national brand, the retailer brand, the budget retailer brand ?
See if ingredient composition align linearly with price (eg: more meat = pricier)
Support shrinkflation investigation (compare products after a change of size/price)
Support inflation investigation (evolution of prices in time)
See if quality labels (eg organic) have an effect on prices
Leverage the other Open Food Facts databases (products, beauty, pet food) to store prices for products other than food
Help gather information about which products are available in your nearby store, as a side effect of price collection
Keep a history of your purchases via your uploaded receipts
Help gather OpenStreetMap POI information and add missing shops

How can I help Open Prices ?

  • Adding prices
  • Feedback, bugs, ideas (Slack, Github, weekly Wednesday meeting)
  • Spread the word to potential third-party uses
  • GDPR: requesting your loyalty card data (GDPR request) + helping document the loyalty card data process

📚 Documentation

FAQ

What happens when a shop goes out of business and gets removed from OSM?

Discussion: https://openfoodfacts.slack.com/archives/C02Q6KM7F/p1724084895885059

Is it possible to upload a pdf receipt with the new version of the OFF app?

Discussion: https://openfoodfacts.slack.com/archives/C02Q6KM7F/p1723559332138529

i've uploaded a receipt and added a couple of the items from it, but may have to finish before i've gotten to all of them - is it possible to resume at a later point or would i have to re-upload the receipt and go through it again?

Discussion: https://openfoodfacts.slack.com/archives/C02Q6KM7F/p1722881061582649

How can I find stores in Open Prices just with OSM node?

Other

see https://github.com/openfoodfacts/open-prices/discussions

Edge cases

Recycling in Norway

In Norway the price tags for beverages packaged in PET plastic bottles don't include the recycling deposit in the price. That's usually displayed with small text separate from the main price. Because of this it can be hard to make out from product shelf photos what the total price is. Up till now I've not added up the total price of product + deposit (except for when adding receipts), but the deposit is usually the same every time based on the drink's volume. Less than 500ml is 2 NOK and more than that is 3 NOK. Should there maybe be a separate field for the recycle deposit to not confuse potential future OCR bots trying to extract prices from the images, or should I start including the deposit in the total price going forward? https://openfoodfacts.slack.com/archives/C02Q6KM7F/p1722185150520809

Public data about prices

France

France Agri Mer (a French national agency) publishes regularly prices of vegetables and fruits, in bulk or in stores.

Israel

Papers to investigate

Marketing & Reads

https://mastodon.gamedev.place/@badlogic/111071396799790275

SDKs

Forum thread

Others

Example : https://www.numbeo.com/cost-of-living/compare_cities.jsp?country1=France&country2=Russia&city1=Paris&city2=Moscow&tracking=getDispatchComparison 0.76 € for a water bottle in Paris in a store. 0,62€ in Moscow We could offer the same kind of data the only difference is that they have… 355,205 contributors

Prenez une simple photo de votre ticket de caisse de supermarché (de supermarché uniquement, on s'occupe juste de ces courses). Et hop, vous retrouvez un peu après l'ensemble de vos achats, en images. A terme, l'historique de vos achats vous permettra, outre de les télécharger (après tout ce sont vos données à vous), de préparer vos listes de courses à partir de vos achats passés, et aussi de valider des promotions qui vous rapportent du cash sur votre compte en banque."

Get in touch

Slack channel

📆 Weekly meeting on Wesdnesdays

🎨 Design & Mockups

Timeline

Date Description
08/11/2023
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