There are so many no sugar added ketchups. They're not hard to find.

Unfortunately those usually contain artificial sweeteners and still taste way too sweet.

I finally managed to find one local (to the Netherlands) brand that sells ketchup without added sugars or sweeteners. The brand was actually started by a person with diabetes who wanted to cut out all sugar from her diet.

It’s so much better than the standard Heinz stuff. Much more savory, you can actually taste the tomatoes.