# Quell Flex vs EbbChart

The clearest difference is update cadence: EbbChart at every 2 months against Quell Flex's every 35 months. EbbChart also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

Quell Flex ships an update every 35 months, EbbChart every 2 months. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Quell Flex | EbbChart |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Every 2 months** |
| Size | 23 MB | 39 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [NeuroMetrix, Inc.](https://appshunter.io/developer/972079953) | [David McAvinue](https://appshunter.io/developer/1891340354) |

## What reviewers say

### Quell Flex

[App page](https://appshunter.io/ios/app/quell-flex/id1507976263)

**Features:** macOS Compatibility

**In-app purchases:** none


### EbbChart

[App page](https://appshunter.io/ios/app/ebbchart-track-your-hearing/id6761764825)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Quell Flex free?

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

### Is EbbChart free?

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

### Do Quell Flex or EbbChart have ads?

Neither Quell Flex nor EbbChart shows ads.

### Which is updated more often, Quell Flex or EbbChart?

Quell Flex ships an update every 35 months, and EbbChart every 2 months. Most recently, Quell Flex was updated on October 13, 2026 and EbbChart on October 14, 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.*