UnderForge vs kCalori
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UnderForge
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UnderForge is a personal fitness and longevity coach that builds a fully customized action plan around your body, your goals, and your life. Then guides you every step of the way and makes it easy to track progress. Whether you want to build muscle, burn body fat, increase strength, or simply get challenged by a world-class program, UnderForge forges a plan that is yours alone. CHOOSE YOUR GOAL Burn body fat Build muscle mass Increase strength Get challenged by your coach HOW IT WORKS When you join, your coach gets to know you. You'll answer a focused set of questions about your training experience, physique, schedule, nutrition, sleep, stress, and existing pain. Your coach then uses that full picture to generate a personalized hypothesis about your biggest obstacles and builds a prioritized, step-by-step action plan designed to break through them. You can review the plan and ask for revisions. This is your forge. HUMA OR AI COACH ALWAYS ON Choose between an AI-only plan and a human + AI plan. AI-only is fully complete and you have all the tools you need to achieve your goals. Human + AI plans adds a boost to accountability and even more personal touch. You decide. Ask about any step in your plan, request a technique breakdown, nutrition targets. Your coach remembers your full profile and adapts every response to your situation. Weekly check-ins keep your plan current. Progress is tracked right inside the app — no need for spreadsheets or additional trackers. CONSISTENCY SCORE AS PRIORITY Most important is that you achieve consistency, therefore we created a unique score to help you stay consistent. The score is higher as you log workouts and meals. This score will also incorporate sleep and breathwork routines and adherence. TRAINING, NUTRITION AND RECOVERY SIMPLIFIED Training — Personalized programming around your schedule, progressive overload, and warm-up protocols. Tailored to gym, home, or park training and available equipment. Nutrition — Macro and calorie targets and guidelines based on your goals and body composition and preferences. Supports all dietary styles vegan, keto, halal, gluten-free, etc. Recovery — Sleep and stress protocols, supplement guidance, and mobility recommendations that keep you performing. Logging — Log workouts easily and meals with photos or text. BUILT FOR REAL PEOPLE From complete beginners to athletes with 10+ years of training, nutrition and longevity expertise, UnderForge adapts to your experience level, your available equipment, your dietary restrictions, and even the areas of your body you want to prioritize. Your plan is not a generic template. It is engineered for you. MUSCLE. LONGEVITY. FORGED. Privacy Policy: https://www.underforge.app/privacy-policy.php Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula
kCalori
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Calorie tracker built around a Czech food database — over 10,000 items from Czech shops. The app interface is in Czech only. Log meals from a photo, a barcode, or by searching the database. Apple Health sync, Apple Watch app, home screen widgets and a shared diary via iCloud. Free to use with a daily limit on AI lookups. Premium removes it.
Screenshots
Verdict
The clearest difference is update cadence: kCalori at every 2 days against UnderForge's every 10 days. UnderForge's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. UnderForge sells 3 in-app purchases, starting at $3.99 per 7 days and kCalori sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
UnderForge ships an update every 10 days, kCalori every 2 days. Both last shipped on November 9, 2026.
| Parameter | UnderForge | kCalori |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 10 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 128 MB | 20 MB |
| Age rating | 17+ | 17+ |
| Developer | Venture CO Group Korlatolt Felelossegu Tarsasag | Milan Marek |
In-app purchases
UnderForge
- UnderForge Premium Weekly14 Days trial$3.997 Days
- UnderForge Premium Quarterly14 Days trial$29.993 Months
- UnderForge Premium Yearly14 Days trial$89.991 Year
kCalori
- Měsíční Předplatné14 Days trial$3.991 Month
- Roční Předplatné14 Days trial$29.991 Year









