# Interval Flow vs PureAir

The clearest difference is in-app purchases: PureAir at none against Interval Flow's 1. PureAir also leads on update cadence (every 5 days vs every 2 weeks). Interval Flow's advantage is ads (none vs shown) and device support (3 vs 1). On price and iOS requirement there is nothing between them.

Both are free to download. Interval Flow sells 1 one-off in-app purchase. PureAir asks for nothing beyond the download.

Interval Flow ships an update every 2 weeks, PureAir every 5 days. The most recent releases landed on October 27, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Interval Flow | PureAir |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Size | 8 MB | 56 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Tegyaan](https://appshunter.io/developer/1711584632) | [ABDULLAH AGSAR](https://appshunter.io/developer/6789255463) |

## What reviewers say

### Interval Flow

[App page](https://appshunter.io/ios/app/interval-flow/id6469113776)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Multiple Programs | $3.99 | one-time |


### PureAir

[App page](https://appshunter.io/ios/app/pureair-quit-smoking-tracker/id6817376502)

**In-app purchases:** none


## Frequently asked questions

### Is Interval Flow free?

Interval Flow is free to download, with in-app purchases available.

### Is PureAir free?

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

### Do Interval Flow or PureAir have ads?

PureAir shows ads; Interval Flow does not.

### Which is updated more often, Interval Flow or PureAir?

Interval Flow ships an update every 2 weeks, and PureAir every 5 days. Most recently, Interval Flow was updated on October 27, 2026 and PureAir on November 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.*