# Zero Doubt Club vs Chart35

The clearest difference is update cadence: Chart35 at every 6 days against Zero Doubt Club's every 2 months. 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.

Zero Doubt Club ships an update every 2 months, Chart35 every 6 days. The most recent releases landed on October 4, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Zero Doubt Club | Chart35 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/zero-doubt-club/id1625322281/reviews)** | — |
| Number of ratings | **6** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | Free | — |
| Size | 201 MB | 5 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Zero Doubt Club Cleveland East LLC](https://appshunter.io/developer/1625322283) | [Stephens Page LLC](https://appshunter.io/developer/6777773686) |

## What reviewers say

### Zero Doubt Club

[App page](https://appshunter.io/ios/app/zero-doubt-club/id1625322281)

This app helps you achieve your fitness goals by tracking workouts and meals with the guidance of a personal trainer. Monitor progress, manage nutrition, and stay motivated with real-time coaching and reminders. Connect wearable devices for seamless data syncing.

**Highlights:** Workout and meal tracking, Progress monitoring, Nutrition management, Real-time coach messaging, Body measurement tracking, Progress photo logging, Wearable device integration

**Features:** Apple Wallet

**In-app purchases:** none


### Chart35

[App page](https://appshunter.io/ios/app/chart35/id6784113411)

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

**In-app purchases:** none


## Frequently asked questions

### Is Zero Doubt Club free?

Zero Doubt Club is free to download, with no in-app purchases.

### Is Chart35 free?

Chart35 is free to download, with no in-app purchases.

### Do Zero Doubt Club or Chart35 have ads?

Neither Zero Doubt Club nor Chart35 shows ads.

### Which is updated more often, Zero Doubt Club or Chart35?

Zero Doubt Club ships an update every 2 months, and Chart35 every 6 days. Most recently, Zero Doubt Club was updated on October 4, 2026 and Chart35 on October 6, 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.*