# Quell Flex vs Pain

The clearest difference is ads: Quell Flex at none against Pain's shown. Pain's advantage is update cadence (every 3 months vs every 35 months) and device support (3 vs 1). On price, 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, Pain every 3 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Quell Flex | Pain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pain-free-back/id6714471871/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 35 months | **Every 3 months** |
| Monetization | — | Ad-supported |
| Size | 23 MB | 88 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [NeuroMetrix, Inc.](https://appshunter.io/developer/972079953) | [PAIN FREE BACK LIMITED](https://appshunter.io/developer/1770265483) |

## What reviewers say

### Quell Flex

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Pain

[App page](https://appshunter.io/ios/app/pain-free-back/id6714471871)

This app provides a personalized and holistic approach to overcoming chronic back pain. It offers tailored exercise routines, mental training techniques, and lifestyle tips to help users achieve long-lasting relief and regain mobility.

**Highlights:** Comprehensive pain relief for various conditions, Customized exercise plans, Mental training for pain alleviation, Evidence-based solutions, Holistic approach with posture and lifestyle tips, Ongoing support and community

**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 Pain free?

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

### Do Quell Flex or Pain have ads?

Pain shows ads; Quell Flex does not.

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

Quell Flex ships an update every 35 months, and Pain every 3 months. Most recently, Quell Flex was updated on November 3, 2026 and Pain on November 4, 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.*