Comparison

FitBODY with Kat vs LockFast

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

FitBODY with Kat

Achieve your health and fitness goals with guided workouts and a healthy eating guide. Offers a variety of workout styles, challenges, and progress tracking. Connect with a supportive community and a fitness professional with over 35 years of experience.

Highlights
  • Variety of workout options (weights/no weights)
  • Targeted workout programs
  • Healthy eating guide and tips
  • Progress tracking
  • Community support group
  • Challenges and motivation
Features
Read full description

Do you dream of achieving your health and fitness goals? Do you lack the knowledge of what to do and how to do it? FitBODY IS THE SOLUTION! Get the fitness motivation and workouts you need with coach Kat to achieve your health and fitness goals! FitBODY WORKOUTS WILL…. Trim inches / Lose weight Maximize fat burning Target arms, legs, back, butt and abs Build lean muscle Build strength, endurance and flexibility Build fitness confidence Improve overall confidence Strengthen muscles to help with your day to day life FitBODY offers a large variety of workout options to do at-home or from anywhere including…. With and Without Weight Workouts With Weights (Dumbbell needed) No Weight (Bodyweight/Pilates Based) Cardio-Full Body-Lower Body-Upper Body-Core and Stretching Tabata, HIIT, Circuit and Rep workout options Challenges to motivate you Healthy eating guide with many healthy tips A place to track your progress Community chat group to ensure support and motivation from others Coach Kat motivating YOU! Programs Included in the APP offer a variety of workouts with weights and without weights including… Real Time Workouts STRONG 6-Week Fitness Challenge KICKSTART 6-Week Fitness Challenge WORKOUT LIBRARY - Cardio, Full Body, Lower Body, Upper Body, Core, Beginner and Stretch Exercises 6 Week Meal Plan Healthy Eating Guide Join KAT! A fitness professional with over 35 years experience helping people achieve their fitness goals. A BODY THAT MOVES MORE BECOMES MORE...go after your FitBODY! Read More about the programs/challenges included in the APP…. STRONG 6-WEEK FITNESS CHALLENGE A fitness challenge that is meant to push you Daily 20 minute full video workouts with Kat Workout 5x a week Each week you do a cardio, full body, lower body, upper body and abdominal workout Motivation and encouragement each and every workout Stretching after each workout KICKSTART 6-WEEK FITNESS CHALLENGE Beginners Friendly Daily 20 minute full video workout with ​Kat Workout 5x a week Intensity builds each week Each workout includes motivation and encouragement Nutrition Tips Stretching after each workout Real Time Workouts Full workout videos with Kat 10, 20 and 30 minute workout options WORKOUT Library All Fitness Levels Daily workout library includes - Cardio, Full Body, Lower Body, Upper Body, Core and Stretching Tabata, Circuit, HIIT and Rep style options Over 600 exercises included Amazing variety to keep you motivated each and every day New workouts added often BEGINNER Workout Library Designed just for beginner 6 levels of workouts that start slow and build intensity with each level Timed or Rep workouts options Full body, upper body, cardio, lower body and core workouts available …..and MORE!!! START TODAY! Read our full Terms of Service and our Privacy Policy: https://passion.io/terms-of-service https://passion.io/privacy-policy

About

LockFast

Features
Read full description

LockFast is the fasting timer built for people who take performance seriously. No meal plans. No calorie counting. No social feeds. Just a precision timer that tracks your metabolic state in real time and tells you exactly where you are in your fast. REAL-TIME METABOLIC ZONES LockFast tracks four metabolic phases as you fast: • Fed — digesting and storing energy (0-4h) • Fat Burning — glycogen depleting, fat mobilizing (4-12h) • Ketosis — producing ketones for fuel (12-16h) • Autophagy — cellular cleanup and renewal (16h+) Watch your progress ring fill as you move through each zone. A countdown shows exactly when you'll hit the next phase. FOUR PROVEN PROTOCOLS Choose the fasting window that fits your life: • 16:8 — the gold standard for beginners • 18:6 — intermediate, deeper fat burning • 20:4 — advanced, extended ketosis • OMAD — one meal a day, maximum autophagy Each protocol includes a full description of what to expect, example timing, and who it's best for. WATER TRACKING Stay hydrated during your fast with built-in water tracking. Quick-add buttons for 250mL, 500mL, and 750mL. Visual progress ring and daily goal tracking. Your body needs water to metabolize fat — LockFast makes sure you don't forget. EATING WINDOW TIMER When your fast ends, LockFast automatically starts an eating window countdown so you know exactly when to begin your next fast. No guesswork, no math. STREAKS & STATS Track your current streak, longest streak, total fasted hours, and average fast duration. A weekly bar chart shows your last 7 days at a glance — the visual accountability that keeps you consistent. SESSION SUMMARIES Every completed fast gets a summary card showing your duration, peak metabolic zone reached, and current streak. The moment of accomplishment that builds the habit. BUILT FOR FOCUS LockFast doesn't try to be a nutrition app, a workout tracker, or a social network. It does one thing — tracks your fast — and does it exceptionally well. Dark interface. Clean design. Zero distractions. Start your first fast in under 60 seconds. Terms of Use (EULA): https://lockfast.io/#terms

Screenshots

FitBODY with Kat4 screens
LockFast4 screens

Verdict

The call

The clearest difference is ads: LockFast at none against FitBODY with Kat's shown. LockFast also leads on update cadence (every 5 days vs every 6 weeks). FitBODY with Kat's advantage is iOS requirement (15.1 vs 26.2). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. FitBODY with Kat sells 4 in-app purchases, starting at $14.99 per month and LockFast sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

FitBODY with Kat ships an update every 6 weeks, LockFast every 5 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

Scorecard3 real differences · 6 level
FitBODY with Kat versus LockFast: the parameters behind the verdict, then further details
ParameterFitBODY with KatLockFast
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 6 weeksEvery 5 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better26.2
Further details — not scored
Size92 MB1 MB
Age rating4+4+
DeveloperKatherine MacKinnonDirk Wood

In-app purchases

4 purchases

FitBODY with Kat

Subscriptions3
  • Monthly$14.991 Month
  • Quarterly$39.993 Months
  • Annual$129.991 Year
One-time1
  • Lifetime Access$199.99
3 purchases

LockFast

Subscriptions2
  • Weekly3 Days trial$3.997 Days
  • Annual7 Days trial$49.991 Year
One-time1
  • LifeTime$149.99

Questions

Is FitBODY with Kat free?
FitBODY with Kat is free to download, with in-app purchases available.
Is LockFast free?
LockFast is free to download, with in-app purchases available.
Do FitBODY with Kat or LockFast have ads?
FitBODY with Kat shows ads; LockFast does not.
Which is updated more often, FitBODY with Kat or LockFast?
FitBODY with Kat ships an update every 6 weeks, and LockFast every 5 days. Most recently, FitBODY with Kat was updated on November 3, 2026 and LockFast on November 5, 2026.

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