Comparison

Diet Lights vs FastTime

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

Head to head
About

Diet Lights

Track your weight and diet progress with a simple traffic light system. Log morning and evening weights, monitor fasting times, and record daily moods and meals. Visualize your trends and reach your target weight with helpful reminders.

Highlights
  • Traffic light weight progress system
  • Intermittent fasting timer
  • Daily mood and meal logging
  • Weight trend graphs
  • BMI calculation
  • Customizable reminders
  • Passcode lock
Features
Read full description

Diet Lights is a simple weight tracking app that helps you record your morning and evening weight and see your diet progress at a glance with traffic light colors. What’s New - Dark Theme The entire app now supports dark mode. Choose System, Light, or Dark in Settings for a more comfortable experience. - Premium Water Widget Log your daily water intake right from Home and see your progress toward your daily goal at a glance. Water tracking is also available in Calendar, making it easier to build healthy habits. - Intermittent Fasting Timer Choose 12h, 16:8, 18:6, 20h, or a custom fasting schedule. Start fasting from the home widget, check progress with a circular timer, and keep your fasting history. - Diary Log your daily mood, meals, condition, and weight-related factors with emoji tags such as dining out, late-night snacks, period, or constipation. - Precise Weight Entry Record your weight with up to 2 decimal places for more accurate weight management and body weight tracking. - Better Goal Tracking Set a target weight, check your progress in 10 stages, and restart your goal from today whenever you want a fresh start. - Morning/Evening Cutoff Time Customize when the app separates morning weight and evening weight based on your lifestyle. Why Diet Lights? For healthy dieting and yo-yo weight prevention, it is helpful to consistently check the difference between your evening weight and the next morning’s weight. Instead of complicated calorie counting, Diet Lights shows your daily progress with simple traffic light colors. Main Features - Traffic Light System Green light: Evening-to-morning weight difference of 1 kg or more Yellow light: Small weight change Red light: Weight increase - Weight Trend Graph View your weight graph by 1 week, 1 month, 3 months, 6 months, or 1 year. Compare morning and evening weight changes and see your target weight line. - Calendar View Check daily traffic lights, morning weight, evening weight, weight changes, BMI, and more on the calendar. Review your monthly diet pattern at a glance. - BMI and Body Mass Index Set your height to check BMI. Choose between WHO standard and Asian standard for a more realistic reference. - Target Weight Set a realistic target weight and track remaining weight, progress rate, and your next stage visually. - Reminders Get notifications for morning and evening weight measurement times. You can also set fasting end reminders. - Backup and Restore Premium users can safely store data with iCloud backup and restore weight records, diary entries, and fasting history when changing devices. - Passcode Lock Protect your personal diet records with a 4-digit passcode lock. How to Measure Your Weight - Morning: After waking up and using the bathroom - Evening: After dinner and before going to bed - Measure at similar times every day - Track not only weight, but also morning/evening differences, meals, fasting time, and condition Premium Features Upgrade to Diet Lights Pro to get: - No ads - Unlimited access to all features - iCloud backup and restore - More convenient personal record management Recommended For - Anyone looking for a simple diet app - Anyone who wants weight management without calorie counting - Anyone who wants consistent weight tracking - Anyone who wants to prevent yo-yo dieting - Anyone using intermittent fasting or a fasting timer - Anyone who wants to manage BMI and target weight - Anyone building healthy habits with calendar, reminders, and diary features - Anyone who needs visual feedback for diet motivation Dieting starts with small daily records. Start building a healthy diet habit with Diet Lights today. To protect your privacy, all data is safely stored on your device. Premium users can choose iCloud backup. If you have any questions, please feel free to contact us. Terms of Service : https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

FastTime

This app offers a straightforward timer for intermittent fasting, allowing users to easily track their fasting hours and progress. It features customizable goals, helpful reminders, and visual statistics to support a healthier lifestyle. Data is kept private and stored locally on the device.

Highlights
  • Ultra-simple one-tap timer
  • Customizable fasting goals
  • Precise fasting reminders
  • Visual statistics and charts
  • Local data privacy
  • No registration required
Features
Read full description

"Simplicity is the key to health. The lightest fasting tracker, FastTime." FastTime is an intuitive timer app designed for everyone practicing intermittent fasting. We've stripped away the noise to focus solely on your fasting hours and progress. [Why Choose FastTime?] - Ultra-Simple Timer: Check your status and start logging with just one tap the moment you open the app. - Customizable Goals: Choose from popular plans like 16:8, 18:6, 20:4, or set your own custom target hours. - Powerful Reminders: Stay consistent with precise alerts for goal completion and upcoming fasting sessions. - Visual Statistics: Review your hard-earned data through charts and feel the sense of achievement. - Data Privacy: Use it instantly without any registration. Your data stays locally on your device for total privacy. Start your journey to a healthier you. Discover the value of fasting with FastTime.

Screenshots

Diet Lights4 screens
FastTime4 screens

Verdict

The call

The clearest difference is in-app purchases: FastTime at none against Diet Lights's 3. FastTime also leads on review sentiment (100% vs 90%). Diet Lights's advantage is update cadence (every 2 weeks vs monthly). On price, ads, device support and iOS requirement 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. Diet Lights sells 3 in-app purchases, starting at $1.99 per 7 days. FastTime asks for nothing beyond the download.

UpkeepUpdate frequency

Diet Lights ships an update every 2 weeks, FastTime monthly. The most recent releases landed on September 7, 2026 and September 20, 2026 respectively.

Scorecard4 real differences · 6 level
Diet Lights versus FastTime: the parameters behind the verdict, then further details
ParameterDiet LightsFastTime
PriceFreeFree
Rating4.5 (2 ratings) — better—
Positive reviews90.0% of reviews100.0% of reviews — better
Number of ratings2 — better—
Update frequencyEvery 2 weeks — betterMonthly
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size94 MB40 MB
Age rating4+4+
DeveloperHouse201Seulki Eom

Customer experience

Diet Lights

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive90.0%
Neutral0.0%
Negative10.0%

FastTime

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Diet Lights

Subscriptions3
  • 프리미엄$1.997 Days
  • Premium Monthly$2.991 Month
  • Premium$12.991 Year
None

FastTime

No in-app purchases

Questions

Is Diet Lights free?
Diet Lights is free to download, with in-app purchases available.
Is FastTime free?
FastTime is free to download, with no in-app purchases.
Do Diet Lights or FastTime have ads?
Both Diet Lights and FastTime show ads.
Which is updated more often, Diet Lights or FastTime?
Diet Lights ships an update every 2 weeks, and FastTime monthly. Most recently, Diet Lights was updated on September 7, 2026 and FastTime on September 20, 2026.

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