Sleep Republic vs Koala: springs or foam, and which one holds up
Australia’s best-known mattress against the one with the highest support score we’ve given. They are built on opposite principles, they cost within $80 of each other, and the right answer depends almost entirely on your weight and whether you sit on the edge of the bed.
You are heavier than average, you sit on the edge of the bed to dress, or you want springs under you rather than foam. It scores 9.5 for support and 9.2 for edge — the two places Koala is weakest.
You do not know what firmness you want, you need the bed this week, or the environmental side matters to you. The comfort layer flips between two feels and delivery is the fastest in the country.
The specifications side by side
| Sleep Republic | Koala | |
|---|---|---|
| Our score | 8.9 | 8.7 |
| Queen price | ~$1,328 | ~$1,249 |
| Construction | Pocket-spring hybrid | All-foam |
| Firmness | Medium-firm, fixed | Flippable — two feels in one mattress |
| Trial | 150 nights | 120 nights |
| Warranty | 12 years | 10 years |
| Owner rating | 4.8 from 2,157 | 4.8 from 1,549 |
| Independent reviewer | 4.8 (Bedbuyer) | 4.0 (Bedbuyer) |
| Delivery | Free, standard courier | Same-day in most metro areas |
The four things we score both on
Our review pages score each mattress on the factors that matter for that product, which means the two lists are not identical — Koala carries scores for delivery speed and environmental credentials that Sleep Republic does not, and Sleep Republic carries cooling and value scores that Koala does not. These four are the ones both are scored on, so these are the only ones worth putting head to head.
Read that honestly and it says: they are the same mattress for comfort, near enough the same for motion, and Sleep Republic is meaningfully better at holding weight up. The 2.4-point gap on edge support is the largest single difference between them and the one most people will physically notice.
Springs against foam
Sleep Republic is a hybrid. Individually wrapped pocket springs sit under comfort foam, zoned so the section under your hips resists more than the section under your shoulders. Springs push back along their whole length, which is why the mattress holds its shape at the perimeter and why heavier sleepers do not sink through it.
Koala is all-foam. There are no springs at all — layers of foam with a flippable top layer that gives you a firmer side and a softer side. Foam supports by compressing, and compression at the edge of a mattress has nothing to push against, which is the whole explanation for the 6.8 edge score.
Neither is inherently better. Foam isolates movement slightly more completely, and Koala’s 9.2 there is genuinely excellent. But foam also softens with body heat and with time in a way springs do not, and that difference compounds over the years you own the thing.
Why edge support decides this for a lot of people
Edge support sounds like a specification nobody buys on, and then you sit on the side of the bed to put your socks on and the mattress folds under you. On a Queen it also costs you usable surface: if the outer 10cm collapses when you roll onto it, two people are sharing a King Single’s worth of solid mattress.
Sleep Republic scores 9.2 here. Koala scores 6.8 — our second-lowest edge score across every mattress we cover. If you share the bed, if you are over about 90kg, or if you sit on the edge daily, this is the line that should decide it.
If you sleep alone, in the middle, and are lighter than average, it barely matters and the rest of the comparison is closer than the scores suggest.
The honest problems with each
We earn a commission if you buy Sleep Republic and we still apply a downward adjustment to its score, because the owner reviews contain a pattern the headline 4.8 does not show: sagging reported between six and twenty-four months, which is well inside the warranty and well outside the 150-night trial.
The second half of the complaint matters more. Owners report warranty claims refused on technicalities, and returns requiring the buyer to find a charity to take the mattress themselves. A 12-year warranty is only worth what the company does when you use it.
Koala’s owner rating is 4.8 from 1,549 reviews, identical to Sleep Republic’s. But Bedbuyer, reviewing hands-on and independently, rates Koala 4.0 against Sleep Republic’s 4.8 — the widest gap between those two sources of any pair on this page.
Its Trustpilot rating is 3.4 from 56 reviews, against Sleep Republic’s 3.0 from 7 — a sample too small on Sleep Republic’s side to mean anything, so we have not used it in either score. The edge support figure is the concrete version of what the independent reviewer is reacting to.
Who should buy which
Buy Sleep Republic if you are heavier than average, you share the bed and use the full width of it, you sit on the edge to dress, or you simply prefer the feel of springs. The extra 30 nights of trial and two years of warranty are worth having, with the caveat above about how the warranty is administered.
Buy Koala if you do not know what firmness suits you and want to be able to change your mind without returning anything, you need a mattress delivered today rather than next week, or the carbon and materials story matters to you. It is also $79 cheaper, which is real but not decisive at this price.
Buy neither if you sleep hot. Sleep Republic scores 8.2 for cooling and Koala’s all-foam construction is warmer still — our hot sleepers guide has better options than either.