The landscape of the UK’s healthy ready-meal sector is shifting rapidly. Current data suggests the market will reach a valuation of £8.7 billion by 2027, spurred by a nation that is increasingly prioritising wellness but lacks the time to maintain it. In fact, one in four households now identifies health as their primary objective for the year ahead.
The challenge lies in the ticking clock of modern life. With the average time spent preparing an evening meal hitting an all-time low of 31 minutes, the gap between nutritional ambition and daily reality is widening. This has led to a 9.6% surge in protein-focused food sales, as consumers look for functional, high-performance fuel that requires zero effort.
However, the definition of healthy is being rewritten. As 66% of UK adults express concern over the impact of ultra-processed foods (UPFs), more people are looking past the calorie count and scrutinising the ingredient list. In this competitive field, Prep Kitchen offers a performance-led approach for athletes, while Calo utilises AI to handle macro precision.
This guide compares Prep Kitchen and Calo to see which fits your lifestyle, while introducing Frive as the 100% UPF-free alternative.
Prep Kitchen vs Calo: A quick comparison
| Category | Prep Kitchen | Calo |
|---|---|---|
| Quality | Macro-balanced, performance-first recipes using Red Tractor chicken. Contains some UPFs and may include E-numbers or industrial additives. | Nutritionist-approved meals tailored via AI. Mix of fresh and freezer-friendly dishes. |
| Variety | 20–30 rotating mains; limited vegan and vegetarian range. | 80+ dishes weekly across breakfasts, mains and snacks. |
| Delivery | Twice weekly (Sun & Mon); some freezer-friendly. | Select delivery days (subject to availability). |
| Cooking | Heats in <5 mins (microwave). | Fully cooked and heats in minutes; some meals are freezer-friendly. |
| Price (6-meal example) | £41.70–£49.50 (£6.95–£8.25 per meal). | £58.50–£60 (around £10 per meal) for a comparable high-protein plan. |
| Reputation | 4.5/5 on Trustpilot (3k+ reviews); elite athlete ambassadors. | 4.3/5 on Trustpilot (300+ reviews). |
| Diet plans | Dedicated fat loss and muscle gain plans. | AI-driven Balanced, Gut Health, High Protein and Custom Macros. |
| Tech Compatibility | Barcode scannable with MyFitnessPal integration. | App-based ordering with built-in AI personalisation and barcode calorie tracking. |
| Best for | Dedicated athletes and strict macro-trackers. | Users who want AI-driven, data-led nutrition support and personalised meal planning. |
Deep dive: Head-to-head comparison
Meal quality and ingredients
Prep Kitchen
Prep Kitchen works with trained chefs and trusted suppliers, using British and seasonal produce where possible. They use free-range eggs and Red Tractor-assured chicken, alongside Modified Atmosphere Packaging to keep food fresh without traditional preservatives. While they are transparent about specific additives like lecithin, the brand does not claim a 100% whole-food status. Their meals are designed for performance, meaning functional ingredients are sometimes prioritised over a strict UPF-free philosophy.
Calo
Calo takes a science-first approach to quality. Every meal is nutritionist-approved and designed via AI to hit exact calorie and macro targets. The ingredients are fresh, but the preparation focuses heavily on precision. For those who see food as a tool for physical performance, Calo provides a consistent, data-driven kitchen. However, this focus on functional nutrition can occasionally mean the meals feel more engineered than artisanal.
Key Takeaway: Choose Prep Kitchen for transparent British sourcing and protein-heavy staples. Choose Calo if you want data and AI-managed portions and macro precision.
Menu variety and nutrition
Prep Kitchen
The menu at Prep Kitchen features approximately 20-30 rotating dishes each week. These are primarily mains with some breakfast options like protein oats. The service is built around specific Weight Loss, Muscle Gain and Maintenance plans with portion sizes like "Large" providing up to 35% more calories and 60g of protein for those with higher energy demands. However, those seeking a wide variety of vegan or vegetarian options may find the selection more limited.
Calo
Variety is Calo's strongest asset, offering more than 80 rotating dishes, including snacks and breakfasts. Instead of a fixed weekly menu, their AI personalisation builds a plan around your specific goals. The philosophy is highly structured, with dedicated plans for Gut Health, High Protein and Balanced eating, resulting in a very automated, app-centric experience.
Key Takeaway: Choose Prep Kitchen for a focused, high-protein menu for muscle gain. Choose Calo for a massive weekly variety and an automated, app-led experience.
Pricing and value for money
Prep Kitchen charges £49.50 for six meals from their high-protein range, which is roughly £8.25 per portion. Calo’s comparable high-protein plan is priced higher, at approximately £60 for six meals (£10 per meal).
The difference in value depends on how much you value technology. Prep Kitchen’s pricing reflects its goal-oriented structure, offering different portion sizes (Regular vs. Large) to help you hit exact macro targets. Calo’s higher price reflects its AI-driven personalisation, tailoring meals around your specific calorie and macro targets. For some users, that added structure justifies the premium.
Both brands offer introductory promotions and selected discounts such as Student or Blue Light eligibility, though these tend to vary over time.
Key Takeaway: Choose Calo for a premium, AI-driven experience that tracks your macros. Choose Prep Kitchen for better value on straightforward, high-protein staples with flexible portion sizes.
Customer reviews and reputation
Prep Kitchen
With a 4.5/5 rating on Trustpilot from over 3,000 reviews, Prep Kitchen has a very strong reputation. Customers frequently mention how the service helps them stay on track with fitness goals. Endorsements from athletes like Anthony Joshua and Eddie Hall further cement its position as a go-to for the fitness community.
Calo
Calo holds a 4.3/5 score on Trustpilot, though this is based on a much smaller UK base of around 300 reviews. Users generally praise the digital personalisation and the macro alignment. Some feedback suggests the meals can feel functional, and the smaller sample size makes it slightly harder to gauge long-term sentiment compared to more established UK rivals.
Key Takeaway: Choose Calo for a modern, results-driven service with high digital praise. Choose Prep Kitchen for a highly-rated, athlete-endorsed experience with a proven UK track record.
Try Thai Red Chicken, Dressed Green Beans, Curry & Ginger Smashed Sweet Potato with 44g of protein.
The pivot: Why Frive is the premium choice for 100% natural fuel
Prep Kitchen and Calo offer effective ways to automate nutrition, but they tend to prioritise numerical targets over ingredients. Whether focusing on high-protein staples or AI-generated macros, the actual quality of fats and the presence of industrial additives can sometimes take a back seat.
Frive changes the perspective on what a healthy ready meal should be.
Instead of just hitting a calorie goal, Frive ensures every gram of nutrition comes from 100% natural, whole-food sources. We have completely eliminated ultra-processed shortcuts, artificial stabilisers and low-quality seed oils. By utilising only premium fats like extra virgin olive oil and avocado oil, our chefs deliver restaurant-standard flavour without compromising on long-term health. As a result, Frive strikes a balance between the practical necessity of meal prep and the uncompromising quality of a clean, additive-free diet.
| Category | Prep Kitchen | Frive | Calo |
|---|---|---|---|
| Quality | Macro-balanced, performance-first recipes using Red Tractor chicken. Contains some UPFs and may include E-numbers or industrial additives. | 100% natural ingredients with zero ultra-processed foods (UPFs). Meals are chef-prepared and nutritionist-approved. | Nutritionist-approved meals tailored via AI. Mix of fresh and freezer-friendly dishes. |
| Variety | 20–30 rotating mains; limited vegan and vegetarian range. | 40+ dishes weekly across breakfasts, snacks and mains. | 80+ dishes weekly across breakfasts, mains and snacks. |
| Delivery | Twice weekly (Sun & Mon); some freezer-friendly. | 4 delivery days (Sun, Mon, Wed, Thu) for 7-day freshness. | Select delivery days (subject to availability). |
| Cooking | Heats in <5 mins (microwave). | Ready in under 5 minutes (microwave) or under 40 minutes (oven). | Fully cooked and heats in minutes; some meals are freezer-friendly. |
| Price (6 meal plan) | £41.70–£49.50 (£6.95–£8.25 per meal). | £50.94 + free delivery (from £8.49/meal). *Limited time offer of 50% off (£3.99 per meal). | £58.50–£60 (around £10 per meal). |
| Reputation | 4.5/5 on Trustpilot (3k+ reviews); elite athlete ambassadors. | 4.5/5 on Trustpilot (11k+ reviews); endorsed by celebrities. | 4.3/5 on Trustpilot (300+ reviews). |
Why Frive is the premium standard for nutrition
100% UPF-free guarantee: While many brands claim to be "healthy," Frive is the only UK meal prep service that guarantees zero ultra-processed foods. Every meal is made from 100% whole foods, using only premium fats, like extra virgin olive oil and avocado oil, with no industrial seed oils, artificial thickeners, or hidden E-numbers.
Commitment to organic sourcing: Up to 30% of all ingredients used are sourced organically to support higher farming standards and long-term health.
Unrivalled menu variety: Don't get stuck in a chicken and rice loop. Frive offers a rotating weekly menu of 40+ different dishes across breakfasts, mains, and snacks. This is significantly more variety than the 20-30 performance-focused meals at Prep Kitchen.
Maximum freshness with 4 delivery days: Unlike competitors who typically deliver once or twice a week, Frive offers four delivery days (Sun, Mon, Wed, Thu) for ultimate freshness throughout the week.
Inclusive dietary support: Premium nutrition should be accessible to everyone. Frive offers a wide range of dietary-specific menus, including dedicated high-protein, vegan, gluten-free, dairy-free, and halal options, without compromising on its 100% natural ingredient standard.
Seamless tech and goal tracking: Hit your targets without the manual labour. Every Frive meal comes with a scannable barcode for instant MyFitnessPal integration. Whether you are on the High Protein (40g+), Low Carb, or Balanced plan, tracking your macros is as simple as a quick scan.
The Frive Rewards Club: Frive rewards you for making healthy choices. As you enjoy and review your meals, you earn points towards treats and discounts for future orders. The Frive app tracks your progress, notifying you when you’ve unlocked a reward and allowing you to view your history.
Eco-conscious packaging: Frive’s commitment to health extends to the planet. All Frive packaging is 100% recyclable or biodegradable, ensuring your convenience does not come at the cost of the environment.
Best for: Health-conscious and busy professionals, couples and fitness enthusiasts who want to stay on track without the burnout of manual meal prep. Frive is the ideal solution for anyone tracking macro goals or seeking a 100% UPF-free diet, providing high-quality, convenient meals for busy careers and active lifestyles.
Read our guides “Frive vs Prep Kitchen” and “Frive vs Calo” for a more comprehensive breakdown.
Prep Kitchen vs Calo: The final verdict
Deciding between Prep Kitchen and Calo all comes down to your goals. If you want high-protein, athlete-focused staples with flexible portion sizes, Prep Kitchen is a reliable partner. If you want an AI-led, app-centric experience that handles your macros for you, Calo is the modern choice.
However, a small difference in price per portion rarely determines long-term success. What keeps you consistent is the trust that what you are eating is genuinely good for you.
If you are a busy professional or someone taking a greater interest in their health who is done with hidden fillers and processed junk, Frive is the right choice for your kitchen. We ensure you get high-quality, 100% natural meals that support your long-term wellness week after week.
Upgrade your fuel with 100% natural ingredients. Try Frive today and enjoy an introductory offer on your first order.
*Please note, offers are subject to change. At the time of writing, Frive is offering a 50% introductory discount on first-week orders for new customers.
