Best Sugar Free Chocolate Bars in the UK: 2026 Guide

Ours, if you want to skip the label reading:

On this page: how to pick · what to check on the pack · sugar free or no added sugar · which Diablo bar · the figures · what else is on the shelf · FAQ

How to pick the best sugar free chocolate bar

Three decisions cover it. The first is the claim on the front, because sugar free and no added sugar are defined differently in GB law and describe different panels, which the next two sections unpack. The second is the sweetener, since maltitol, erythritol, steviol glycosides and sucralose each bring a different sweetness, texture and calorie count to the bar, and the ingredients list names the one in your hand. The third is the cocoa level: a milk bar sweetened with maltitol will carry a few grams of sugars from its milk powder while a dark bar carries almost none, and the darker the bar the lower the sugars figure tends to run.

Diablo builds every bar on maltitol, a polyol made from starch that behaves like sugar in the recipe, so the chocolate tempers, snaps and melts the way you expect. Five of the 75 g bars add steviol glycosides at 0.02 percent alongside the maltitol. Polyols follow the recipe: 80 percent cocoa leaves little room for anything else, so the 80% dark shows 20 g per 100 g against 42 g in the 85 g dark.

What should you check before you buy a bar?

Sugar free or no added sugar: what is the difference?

Both are nutrition claims with fixed conditions in the GB nutrition and health claims register. Sugar free means no more than 0.5 g of sugars per 100 g, and polyols do not count as sugars, so a maltitol bar can qualify while still tasting sweet. No added sugar means no sugars or sweetening foods such as honey or fruit syrup were added, and where sugars occur naturally in the milk or cocoa the pack says so with the line "contains naturally occurring sugars".

The Diablo bars in this guide sit in the No Added Sugar range. On the dark bars the sugars figure runs from 0.5 g to 2 g per 100 g and comes from the cocoa; on the milk and white bars it runs from 6.3 g to 10 g and comes from the milk powder. Neither number is added sugar, and the table further down prints each one. For the full explainer, read sugar free vs no added sugar.

Which Diablo bar suits which taste?

How do the Diablo bars compare on paper?

Every figure is per 100 g from the product's own panel. Every bar here is in the No Added Sugar range, with its sugars occurring naturally in the cocoa, the milk powder, the nuts or the fruit.

Two patterns stand out. The dark bars sit at 2 g of sugars per 100 g or under. The milk and white bars sit between 6 g and 10 g, because milk powder brings lactose with it whatever the sweetener. And polyols follow the cocoa level, not the sweetener blend: 20 g in the 80% dark against 42 g in the 85 g dark, while the milk bars with steviol glycosides carry 44 g to 46 g. Every product page prints the full panel, including saturated fat and salt, so the comparison can be taken further from there. Maltitol itself is covered in what is maltitol.

What else is on the shelf?

A fair roundup names the other bars a UK shopper will see, so here are seven, with each figure taken per 100 g from that brand's own product page as read on 29 September 2026. These rows are published facts and nothing more: no scores, no prices and no links, because the point is to show how different recipes reach a low sugars figure, not to rank them.

The table shows the two routes to a low sugars figure. One replaces the sugar with a polyol, a stevia blend or both. That is the route Diablo, Torras, Frankonia and the 25 g bar all take, and it keeps a familiar level of sweetness with the polyols showing on their own line. The other pushes cocoa so high that there is almost no room left for anything sweet. That is how a 99 percent or 100 percent bar reaches 1 g or under with nothing sweet in the recipe at all. A 90 percent bar sits between the two: sugar is still an ingredient, and the panel shows 7 g per 100 g.

Frequently Asked Questions

Which sugar free chocolate bar has the lowest sugars figure?

Of the ten Diablo bars here, all in the No Added Sugar range, the lowest is the No Added Sugar Dark Chocolate 85 g at 0.5 g of sugars per 100 g, occurring naturally in the cocoa, with 42 g of polyols and 8.1 g of fibre on the same panel. The Dark Chocolate and Hazelnuts 85 g follows at 1 g.

Is sugar free chocolate really free of sugar?

Almost. In GB the sugar free claim is allowed at 0.5 g of sugars per 100 g or under, so a trace can remain. Polyols such as maltitol are not sugars and are printed on their own line, which is why the bar still tastes sweet.

Does sugar free chocolate affect blood glucose?

It depends on the sweetener. For maltitol the authorised GB wording is that consumption of foods/drinks containing maltitol instead of sugar induces a lower blood glucose rise after their consumption compared to sugar-containing foods/drinks.

How much sugar free chocolate is comfortable in one sitting?

Polyols are absorbed slowly, which is the reason for the lower glucose rise, and every pack over 10 percent polyols says that excessive consumption may produce laxative effects. A few pieces at a time is the comfortable pattern, and a bar keeps well in a cool cupboard for the next evening.

See the whole range in one place