Syns in Hartley's 10 Cal Jelly: Complete Slimming World Guide

Updated on 
9 March, 2026

Are Hartley's 10 Cal Jellies Syn Free On Slimming World? - Our Unofficial Slimming World Syn Guide!

If you are a sweet snacker or dessert lover, finding food which won't cost you too many syns, but satisfy your sweet tooth isn't always easy, Hartley's 10 cal jellies however could be a great choice, due to their low-calorie content.

Hartley's 10-calorie jellies are very low in syns, having only 0.5 syns per pot, making them an excellent low syn snack choice for a sweet dessert!

In our short syn guide below, we will discuss in further detail why these jellies are so low in syns, some syn values of their whole range and low syn alternatives for a healthy sweet treat!

Why Are Hartley's 10 Cal Jellies So Low In Syns?

At 0.5 syns a pot, Hartley's 10 calorie jellies are a very low-syn sweet treat to have on the slimming world plan, allowing you to have up to thirty pots if you want in one day!

These jellies are so low in syns since they contain sweeteners rather than traditional sugar, keeping the calories low. We would recommend consuming them in moderation however since sweeteners in excess can have negative side effects on your health.

Syn Values Of Hartley's 10 Calorie Jellies

Hartley's has a wide range of 10-calorie jellies on offer with different flavours, we've listed their syn values down below to help you stay on track.

  • Hartley's 10 Cal Strawberry Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Raspberry Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Blueberry & Blackcurrant Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Orange Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Mango & Passion Fruit Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Rhubarb & Custard Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Raspberry Jam Doughnut Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Blueberry Muffin Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Pina Colada Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Strawberry Daiquiri Flavour Jelly 175g - 0.5 syns.
  •  Hartley's 10 Cal Gin and Tonic Flavour Jelly 175g - 0.5 syns.

Low Syn Alternatives To Hartley's 10 Cal Jellies

If you want to find similar low syn jellies to Hartley's 10 cal jellies, we've listed some low syn alternatives below to stock up on.

  • Aldi Dominion Sugar Free Jelly Bears 75g - 2.5 syns.
  •  Morrisons Strawberry Flavour Sugar Free Jelly 11.5g - 0.5 syns.
  •  Jell-O Sugar Free Strawberry Jelly Mix 8.5g - 0.5 syns.
  •  Chivers Sugar Free Strawberry Flavour Jelly Crystals 11.5g - 0.5 syns.
  •  Chivers Sugar Free Raspberry Flavour Jelly Crystals 11.5g - 0.5 syns.
  •  Green's Sugar Free Strawberry Jelly 17g - 0.5 syns.
  •  Robinsons Sugar Free Jelly Orange & Pineapple Flavour 11.5g - 0.5 syns.
  •  Aldi Delicious Desserts Raspberry Flavour Sugar Free Jelly Crystals 11.5g - 0.5 syns.
  •  Robinsons Sugar Free Jelly Apple and Blackcurrant Flavour 11.5g - 0.5 syns.
  •  Robinsons Sugar Free Jelly Summer Fruits Flavour 11.5g - 0.5 syns.
  •  Jell-O Sugar Free Orange Jelly Mix 8.5g - 0.5 syns.

Final Words

To conclude, Hartley's 10 calorie jellies are very syn friendly, having just 0.5 syns per pot, making them an excellent sweet treat to have on the plan without having to indulge and use too many syns. You could have up to thirty on the plan.

If you are looking for other low calorie desserts, we have a great syn guide here.

Frequently Asked Questions

How are syn values calculated?

Syn values are calculated using a formula based on calories, saturated fat and sugar content per serving. They’re not the same as calories — a product can be low in calories but higher in syns if it’s high in sugar or fat. Always check the official Slimming World app for the most accurate and up-to-date syn values.

Do syn values change?

Yes. When manufacturers reformulate their products, the syn value can go up or down. This is why we recommend double-checking with the Slimming World app or your consultant, especially if a product’s packaging has changed recently.

How many syns should I have per day?

Most Slimming World members work with 5 to 15 syns per day. Your consultant will advise on the right amount for you. The key is to use your syns on the things you enjoy most — whether that’s a chocolate bar, a glass of wine, or a packet of crisps.

Jennifer
Jennifer is a certified nutritionist and weight loss coach with a Master's in Nutrition from Cambridge. With over 10 years experience, she shares healthy recipes and science-backed slimming tips on SheCooksSheEats to help people reach their wellness goals. Jennifer stays up-to-date by regularly attending conferences and continuing her nutrition education. She aims to provide research-backed advice to inspire balanced, happy living.
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