The short answer nobody wants to hear
There is no single cheapest supermarket in Australia. Not Woolworths. Not Coles. Not even ALDI; though ALDI wins more categories than most people expect.
Prices shift week to week. Woolworths might be cheapest on pantry staples this week while Coles wins on dairy and ALDI undercuts both on fresh produce. Next week, the picture changes.
Most "cheapest supermarket" articles get this wrong. They compare one basket on one day and present it as settled truth. Grocery pricing moves too much for that.
How Australian supermarket pricing actually works
Woolworths and Coles run on weekly promotional cycles. Every Wednesday, thousands of products rotate between full price and some version of a discount; half price, multi-buy, temporary price drop. ALDI runs a different model with lower everyday shelf prices and a smaller range.
This means the cheapest place to buy any given product depends on three things: what is on promotion this week, what the everyday shelf price is at each store, and whether the "special" is genuinely good or just a price returning to where it was a few weeks ago.
The Wednesday cycle matters more than store choice. A product that costs $7 at Woolworths on Tuesday might cost $3.50 on Wednesday. If you are shopping on the right day with the right list, one store can be dramatically cheaper than the others; but only on the items that happen to be cycling down that week.
Where each store tends to win
These are patterns, not guarantees. Pricing shifts, and individual products break every rule. But across thousands of products tracked over time, some general tendencies hold up.
- ALDI tends to have lower everyday prices on pantry basics, cleaning products, and their private-label range. Their range is smaller, but on the products they do stock, the shelf price is often the lowest before any specials are applied.
- Woolworths and Coles are competitive on branded products when promotions are running. If you are flexible on timing and willing to buy a branded item during its half-price week, you will often beat ALDI's everyday price on that specific product.
- Fresh produce is volatile. ALDI is frequently cheapest on fruit and veg, but Woolworths and Coles run aggressive short-cycle promotions that can undercut ALDI on specific items for a few days.
- Household and personal care products cycle heavily between Woolworths and Coles. Laundry detergent, shampoo, and cleaning products often hit 50 per cent off at one chain while the other holds full price; then they swap.
The better question: which items, not which store
Instead of picking a single store and hoping for the best, the smarter move is to compare prices on the items you actually buy. Not a hypothetical basket from a newspaper article. Your list. Your brands. Your quantities.
"ALDI is cheapest" or "Coles has better specials" means nothing for your actual shop. "Your 15-item list costs $62 at Woolworths, $58 at Coles, and $54 split across Coles and ALDI"; that you can work with.
Getting that second answer by hand is tedious. Getting it from an app that already tracks the prices takes a few seconds.
How to actually compare without driving to three stores
That is what Discount Trolley does. You can search for any product and see the current price at Woolworths, Coles, and ALDI side by side; sorted by unit price so you can see which is genuinely cheapest per 100 grams, per litre, or per unit.
The price history chart on each product shows you whether this week's price is genuinely low or just returning to where it was before the last promotion. That matters because a "half-price special" is only useful if the product actually spends most of its time at the higher price.
If you build a shopping list in the app, Smart Split takes that list and calculates exactly where each item is cheapest; then tells you what the total would be at each store, or split across two stores, with the dollar difference shown. You decide whether the extra stop is worth the saving.
- Search once, see all three store prices ranked by unit cost
- Check price history before trusting a promotional sticker
- Use Smart Split to find the cheapest way to buy your actual list
- Scan a barcode in-store to instantly compare against other stores
The Wednesday strategy that actually works
If you want to consistently pay less without changing what you eat, the simplest strategy is also the most boring: check what is on promotion at all three stores each Wednesday, stock up on the things you use when they hit genuine lows, and skip the rest.
Nobody is asking you to clip coupons. You are buying the same things you already buy, just at the point in the cycle when they cost less. Pantry staples, frozen goods, and cleaning products cycle regularly enough that you can almost always find the version you want at a genuine low somewhere.
Discount Trolley's Coming This Wednesday preview lets you see next week's specials from Saturday. That gives you a few days to plan your list around the best real deals instead of reacting to whatever you see when you walk through the door.
Questions shoppers still ask
Is ALDI always the cheapest supermarket in Australia?
ALDI tends to have lower everyday shelf prices on many basics, but it does not stock every brand or product. On branded items during a half-price promotion, Woolworths or Coles can be cheaper. The cheapest option depends on your specific list and what is on promotion that week.
Are Woolworths half-price specials actually good deals?
Sometimes. A genuine half-price on a product that normally sits at the higher price for weeks is a real saving. But some products cycle so frequently that the promoted price is effectively the normal price. Checking price history helps you tell the difference.
How can I compare grocery prices without visiting every store?
Discount Trolley lets you search any product and see current prices at Woolworths, Coles, and ALDI in one place, sorted by unit price. You can also scan barcodes in-store to instantly check if another store has it cheaper.
Does Discount Trolley cover all products at all three stores?
The app tracks publicly available pricing from all three major chains. It covers tens of thousands of products across Woolworths, Coles, and ALDI. It cannot see every in-store markdown or loyalty-only offer, but it covers the published shelf and promotional prices.
Stop guessing which store is cheapest. Just check.
Discount Trolley compares prices across Woolworths, Coles, and ALDI in one search. See price history, find genuine deals, and let Smart Split tell you the cheapest way to buy your actual list.
- Compare all three stores side by side on any product
- Price history charts on every item; know when a deal is real
- Smart Split finds the cheapest way to buy your whole list
- Scan a barcode in-store to compare instantly