Homemade Soda beats Store-Bought Sugar-Free Colas in Blind Test

All colas in the test. Photo: Malin Hefvelin
All colas in the test. Photo: Malin Hefvelin
The taste test had 106 test participants. Photo: Malin Hefvelin.
The taste test had 106 test participants. Photo: Malin Hefvelin.

Sugar-free cola is the most common type of soda in Sweden, with over 341 million liters sold last year. Testfakta conducted a comprehensive taste test of seven different store-bought sugar-free colas and one homemade version, yielding surprising results.

Published: 26 May, 2025

A full 70% of all soft drinks sold in Sweden are cola-flavored, according to the Swedish Breweries Association. Sugar-free soft drinks have had a strong development in recent years and currently account for 56% of the soft drink volume in Sweden. When it comes to cola drinks, light soft drinks are even stronger – a full 66% of the cola soft drinks sold were sugar-free.

– The increase in sugar-free soft drinks is part of a long-term trend, says Johanna Lagerman at Sveriges Bryggerier. Over the past ten years, sales of sugar-free soft drinks have increased by over 200%. At the same time, sales of sugar-sweetened soft drinks have decreased by over 25%. This is a result of breweries working towards ambitious goals for reduced sugar consumption at the same time as consumer demand for sugar-free products is growing.

Sodastream is the largest brand of carbonated machines in Sweden and accounts for just over half of all machines sold. The company also has a range of different flavors to spice up the carbonated water with. The best-seller is cola flavor in the form of Pepsi Max.

Sugar-free drinks contain sweeteners instead of traditional sugar made from sugar beets or sugar cane. Common sweeteners in sugar-free soft drinks include Aspartame, Acesulfame-K, and Cyclamate. Pepsi Max Original contained the most sweeteners at 632 mg/l, while the other drinks were between 300 and 500 mg/l.

The taste test was conducted by the independent testing company The Taste Lab. A total of 106 consumers participated in a blind test, sampling both bottled sodas purchased in stores and Pepsi Max made from concentrate using a SodaStream machine.

Additionally, the independent laboratory Eurofins Food & Feed Testing Sweden performed a chemical analysis focusing on sweeteners and caffeine content.

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The chemical analysis revealed that both the bottled and concentrated versions of Pepsi Max contained over 120 mg of caffeine per liter, compared to brewed coffee, which contains approximately 460 mg/l. Freeway Cola had the lowest caffeine content at just under 90 mg/l. For reference, energy drinks typically contain around 300–400 mg/l.

Researcher Johan Swahn at The Taste Lab and was responsible for the taste test. He was surprised that there was such a big difference in taste between the different cola drinks.

– And not only in taste, the amount of carbonation and how the soft drink is experienced in the mouth also differ significantly between the different brands.

Three of the drinks received a rating of over 8, which can be considered well approved. The highest rated was Sodastream Pepsi Max, which received an overall rating of 8.4.

– Interestingly enough, it was the sodastreamed cola drink that won and was ranked best on most of the tested parameters. It had the best results in both overall impression and mouthfeel, and shared first place in taste. Consumers felt that it had a moderate cola taste and flavor intensity, with just the right amount of acidity and carbonation, says Johan Swan.

In shared second place came Pepsi Max and Freeway Cola Sugarfree, while Coca Cola Zero and Premiere Cola Zero Sugar ended up a bit behind. The worst in the test was Ica Zero Sugar, which the panel felt had too little of both the cola taste, acidity and carbonation.

Price-wise, Sodastream is also the best if you don't count the cost of purchasing the carbonation machine. The purchased soft drink costs between 8.60 SEK/l for Premiere Cola Zero up to 14.75 SEK/l for Coca Cola Zero, while Sodastreamed cola costs between 7.89 – 8.52 SEK/l, depending on the cost of the carbonation cartridge. You also make a considerable environmental gain when you make your own bubbles by avoiding transport and plastic to transport large quantities of drinks, while having excellent quality water at home on the tap.

How we did the test

The independent sensory and consumer research agency The Taste Lab had a panel of 106 consumers test eight diet cola drinks in a blind sensory test. Overall impression, taste experience and mouthfeel were rated and weighted as follows:

Overall impression               50%
Taste experience                  35 %
Mouthfeel                                15%

Testfakta also had the laboratory Eurofins Food & Feed Testing Sweden carry out a chemical analysis of the amount of caffeine and sweeteners. The results are reported in the table but have not been rated.

Cola soft drink
The taste of the soft drink cola comes from a mixture of different citrus aromas, such as orange, lime and lemon, in combination with a number of different spices, such as cinnamon, nutmeg and vanilla. Cola drinks used to often contain kola nut and coca leaves, but this is no longer used. The drink is sweetened either with sugar or – if it is a sugar-free version – with sweeteners such as isoglucose, stevia or completely artificial sweeteners. Cola usually contains phosphoric acid (E338) instead of citric acid 330 which is more common in other soft drinks.

Here is how we calculated the price of Sodastream Pepsi Max:
A bottle of Sodastream Pepsi Max concentrate costs about 65 SEK and provides 9 liters. The price of exchanging a carbonation cartridge is between 39.90 and 79.90 SEK and one cartridge provides approximately 60 liters of water, which gives a liter price of carbonated water between 67 öre and 1.30 SEK. The liter price of the home-carbonated cola drink then ends up between 7.89 SEK/l and 8.52 SEK/l, even if the cost of the machine is added. You also make a significant environmental gain by avoiding transportation and plastic to ship large quantities of drinks, while having excellent quality water at home on the tap.

TABLE OF TEST RESULTS