For major cities in those countries you could get probably more relevant data by specifying cities itself.

First city:
Contribute data for another city in Ireland
Second city:
Contribute data for another city in Spain
Indexes DifferenceInfo
Consumer Prices in Spain are 30.01% lower than in Ireland
Consumer Prices Including Rent in Spain are 31.71% lower than in Ireland
Rent Prices in Spain are 35.09% lower than in Ireland
Restaurant Prices in Spain are 30.67% lower than in Ireland
Groceries Prices in Spain are 53.41% lower than in Ireland
Local Purchasing Power in Spain is 36.42% lower than in Ireland

Currency: Settings
Ireland
 
Restaurants [Edit]
Meal, Inexpensive Restaurant 10.40 €
Meal for 2, Mid-range Restaurant 61.33 €
Combo Meal at McDonalds or Similar 6.89 €
Domestic Beer (0.5 liter draught) 4.16 €
Imported Beer (0.33 liter bottle) 4.90 €
Coke/Pepsi (0.33 liter bottle) 1.70 €
Water (0.33 liter bottle) 1.65 €
 
Markets [Edit]
Milk (regular), 1 liter 1.09 €
Loaf of Fresh Bread 1.85 €
Eggs (12) 3.25 €
Fresh Cheese (1kg) 15.00 €
Water (1.5 liter bottle) 2.33 €
Bottle of Wine (Mid-Range) 9.33 €
Domestic Beer (0.5 liter bottle) 2.00 €
Imported Beer (0.33 liter bottle) 1.75 €
Pack of Cigarettes (Marlboro) 8.88 €
 
Transportation [Edit]
One-way Ticket (local transport) 1.88 €
Monthly Pass 95.00 €
Taxi (5km within center) 10.00 €
Gasoline (1 liter) 1.30 €
 
Utilities (Monthly) [Edit]
Basic (Electricity, Gas, Water, Garbage) 83.33 €
Mobile Phone 100 Minutes Call 21.25 €
Internet (2 Mbps ADSL flat) 25.00 €
 
Sports And Leisure [Edit]
Fitness Club, Monthly Fee for 1 Adult 64.17 €
Tennis Court Rent (1 Hour on Weekend) ?
Cinema, International Release, 1 Seat 9.67 €
 
Rent Per Month [Edit]
Apartment (1 bedroom) in City Centre 941.67 €
Apartment (1 bedroom) Outside of Centre 660.00 €
Apartment (3 bedrooms) in City Centre 1,535.00 €
Apartment (3 bedrooms) Outside of Centre 1,170.00 €
 
Buy Apartment Price [Edit]
Price per Square Meter to Buy Apartment in City Centre 5,000.00 €
Price per Square Meter to Buy Apartment Outside of Centre 4,000.00 €
 
Salaries And Financing [Edit]
Median Monthly Disposable Salary (After Tax) 2,517.86 €
Mortgage Interest Rate in Percentanges (%), Yearly For USD / EUR 7.00
Spain
 
Restaurants [Edit]
Meal, Inexpensive Restaurant 9.29 €
Meal for 2, Mid-range Restaurant 32.19 €
Combo Meal at McDonalds or Similar 6.35 €
Domestic Beer (0.5 liter draught) 1.99 €
Imported Beer (0.33 liter bottle) 2.35 €
Coke/Pepsi (0.33 liter bottle) 1.73 €
Water (0.33 liter bottle) 1.21 €
 
Markets [Edit]
Milk (regular), 1 liter 0.84 €
Loaf of Fresh Bread 0.86 €
Eggs (12) 1.48 €
Fresh Cheese (1kg) 7.96 €
Water (1.5 liter bottle) 0.69 €
Bottle of Wine (Mid-Range) 4.09 €
Domestic Beer (0.5 liter bottle) 0.88 €
Imported Beer (0.33 liter bottle) 1.33 €
Pack of Cigarettes (Marlboro) 3.47 €
 
Transportation [Edit]
One-way Ticket (local transport) 1.17 €
Monthly Pass 34.70 €
Taxi (5km within center) 9.55 €
Gasoline (1 liter) 1.05 €
 
Utilities (Monthly) [Edit]
Basic (Electricity, Gas, Water, Garbage) 83.25 €
Mobile Phone 100 Minutes Call 25.12 €
Internet (2 Mbps ADSL flat) 33.39 €
 
Sports And Leisure [Edit]
Fitness Club, Monthly Fee for 1 Adult 45.80 €
Tennis Court Rent (1 Hour on Weekend) 7.00 €
Cinema, International Release, 1 Seat 7.40 €
 
Rent Per Month [Edit]
Apartment (1 bedroom) in City Centre 592.69 €
Apartment (1 bedroom) Outside of Centre 455.40 €
Apartment (3 bedrooms) in City Centre 975.12 €
Apartment (3 bedrooms) Outside of Centre 772.06 €
 
Buy Apartment Price [Edit]
Price per Square Meter to Buy Apartment in City Centre 4,423.08 €
Price per Square Meter to Buy Apartment Outside of Centre 2,779.17 €
 
Salaries And Financing [Edit]
Median Monthly Disposable Salary (After Tax) 1,093.22 €
Mortgage Interest Rate in Percentanges (%), Yearly For USD / EUR 3.43