MasterMarket vs Cisean: which Irish grocery comparison app saves you more?

Both apps want to help Irish shoppers spend less on the same five supermarkets, but they pursue that goal differently. Cisean is built around an open-data, community-contributed catalogue — its in-app games invite users to scan barcodes and match products, and its database lives on GitHub. It's a strong fit for shoppers who enjoy contributing and want loyalty cards in one place.

MasterMarket is built around the act of saving money on a specific basket: daily-scraped prices, alerts when the items you actually buy drop in price, and an AI assistant — Foxy — that compares your basket across the 5 stores in seconds. The two apps make different bets about how Irish people shop.

Most shoppers don't open a comparison app every day. They notice a price after paying, or miss a promotion entirely because they didn't check. Price-drop alerts flip that pattern — the app tells you when the trolley you'd build this week is suddenly cheaper at Aldi, or when your usual yoghurt drops at Tesco.

MasterMarket Premium goes a step further with price-drop predictions: based on the price history we've scraped, the app flags items likely to fall this week so you can wait, or items at a structural low so you can stock up. This is the single biggest behavioural difference between the two apps — Cisean's product surfaces don't list price alerts at all, which means the user has to remember to check.

Foxy is MasterMarket's built-in AI assistant. It's conversational, not a search box. You can ask things like:

• “Rebuild my last basket at the cheapest store this week.”
• “Where is Kerrygold butter cheapest right now?”
• “Is a Tesco Clubcard worth it on this shopping list?”

The free tier gives you 10 questions an hour. Premium raises that to 50/hour and unlocks the AI Basket Optimizer, which rebuilds a saved basket across the five stores and shows you the cheapest split. Cisean does not list an AI assistant on its product surfaces.

Data freshness is the quiet thing that makes or breaks a comparison app. MasterMarket scrapes the five retailer websites daily, then overlays community reports for items the scrapers miss or mis-parse. That gives a high baseline freshness across the long tail.

Cisean's data model leans on user contributions through its gamified scanning experiences — Barcode Hunter and Match Maker — and an open-source barcode database on GitHub. It's a transparent, community-first approach with real merit, and we mention it neutrally. The trade-off is that per-product freshness depends on community activity, which is uneven across the catalogue. Daily-refreshed scraped pricing is, on balance, the better fit for promotional / multi-buy detection.

Neither app is universally “better.” They're tuned to slightly different shopping behaviours.

Choose MasterMarket if you want price-drop alerts on the items you actually buy, an AI basket optimiser that compares the five stores for you, daily-refreshed scraped prices, and a clear premium path (€2.99/month) when free isn't enough.

Choose Cisean if you want a free-only app, you'd like to store all your loyalty cards in one place, you want weekly in-app leaflets, or you specifically want to support an open-data community project.

Plenty of Irish shoppers will be well-served by using both — Cisean for the loyalty wallet and leaflets, MasterMarket for the daily prices, alerts and AI. There's no exclusivity.