# Second Nature vs Birch Fit

The clearest difference is update cadence: Second Nature at every 3 days against Birch Fit's every 3 weeks. 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.

Second Nature ships an update every 3 days, Birch Fit every 3 weeks. The most recent releases landed on November 1, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Second Nature | Birch Fit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (57 ratings)](https://appshunter.io/ios/app/second-nature/id885435960/reviews)** | — |
| Number of ratings | **57** | — |
| Positive reviews | 65.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | Free | — |
| Size | 134 MB | 15 MB |
| Requires iOS | 16.4 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Second Nature Health Ltd](https://appshunter.io/developer/885435963) | [Daniel Birch](https://appshunter.io/developer/1231336937) |

## What reviewers say

### Second Nature

[App page](https://appshunter.io/ios/app/second-nature/id885435960)

This app uses behavioral science to help you build healthy habits for long-term weight loss. It tracks sleep, exercise, and emotional regulation, offering personalized advice from a nutritionist and a library of recipes and educational articles.

**Highlights:** Behavioral science approach, Personalized nutritionist support, Holistic habit tracking (sleep, exercise, emotions), Healthy recipe library, Daily educational articles, Apple HealthKit integration

**Features:** Apple Wallet

**In-app purchases:** none


### Birch Fit

[App page](https://appshunter.io/ios/app/birch-fit/id6752855623)

**In-app purchases:** none


## Frequently asked questions

### Is Second Nature free?

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

### Is Birch Fit free?

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

### Do Second Nature or Birch Fit have ads?

Neither Second Nature nor Birch Fit shows ads.

### Which is updated more often, Second Nature or Birch Fit?

Second Nature ships an update every 3 days, and Birch Fit every 3 weeks. Most recently, Second Nature was updated on November 1, 2026 and Birch Fit on October 5, 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.*