# Flexible Dieting Method vs CalSlashD

The clearest difference is in-app purchases: Flexible Dieting Method at none against CalSlashD's 1. Flexible Dieting Method also leads on iOS requirement (15.0 vs 18.0). CalSlashD's advantage is update cadence (every 2 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. CalSlashD sells 1 one-off in-app purchase. Flexible Dieting Method asks for nothing beyond the download.

Flexible Dieting Method ships an update every 3 weeks, CalSlashD every 2 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Flexible Dieting Method | CalSlashD |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 49 MB | 10 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Delicious Deficit LLC](https://appshunter.io/developer/1784463670) | [Daniel Hotyanov](https://appshunter.io/developer/1825695141) |

## What reviewers say

### Flexible Dieting Method

[App page](https://appshunter.io/ios/app/flexible-dieting-method/id6739252196)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### CalSlashD

[App page](https://appshunter.io/ios/app/calslashd-calorie-countdown/id6784985279)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cal/d Plus | $9.99 | one-time |


## Frequently asked questions

### Is Flexible Dieting Method free?

Flexible Dieting Method is free to download, with no in-app purchases.

### Is CalSlashD free?

CalSlashD is free to download, with in-app purchases available.

### Do Flexible Dieting Method or CalSlashD have ads?

Neither Flexible Dieting Method nor CalSlashD shows ads.

### Which is updated more often, Flexible Dieting Method or CalSlashD?

Flexible Dieting Method ships an update every 3 weeks, and CalSlashD every 2 days. Most recently, Flexible Dieting Method was updated on October 24, 2026 and CalSlashD on October 28, 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.*