# Diet Lights vs FastTime

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.

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.

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

## The numbers

| Metric | Diet Lights | FastTime |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/diet-lights-weight-tracker/id6748281990/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 90.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 94 MB | 40 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [House201](https://appshunter.io/developer/1767211373) | [Seulki Eom](https://appshunter.io/developer/1718927408) |

## What reviewers say

### Diet Lights

[App page](https://appshunter.io/ios/app/diet-lights-weight-tracker/id6748281990)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 프리미엄 | $1.99 | per 7 days |
| Premium Monthly | $2.99 | per month |
| Premium | $12.99 | per year |


### FastTime

[App page](https://appshunter.io/ios/app/fasttime-fasting-timer-and-log/id6761371909)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*