# BACKTOFIT vs D

The clearest difference is update cadence: D at every 5 months against BACKTOFIT's every 13 months. BACKTOFIT's advantage is iOS requirement (13.4 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BACKTOFIT ships an update every 13 months, D every 5 months. The most recent releases landed on October 29, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | BACKTOFIT | D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 5 months** |
| Size | 28 MB | 27 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BACKTOFIT SPOR VE SAGLIK HIZMETLERI LIMITED SIRKETI](https://appshunter.io/developer/1626072015) | [D-Gym](https://appshunter.io/developer/1495643381) |

## What reviewers say

### BACKTOFIT

[App page](https://appshunter.io/ios/app/backtofit/id1442079425)

**In-app purchases:** none


### D

[App page](https://appshunter.io/ios/app/d-gym/id1495643382)

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

**In-app purchases:** none


## Frequently asked questions

### Is BACKTOFIT free?

BACKTOFIT is free to download, with no in-app purchases.

### Is D free?

D is free to download, with no in-app purchases.

### Do BACKTOFIT or D have ads?

Neither BACKTOFIT nor D shows ads.

### Which is updated more often, BACKTOFIT or D?

BACKTOFIT ships an update every 13 months, and D every 5 months. Most recently, BACKTOFIT was updated on October 29, 2026 and D on November 3, 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.*