# Deep Flow vs Math Shield

The clearest difference is in-app purchases: Deep Flow at none against Math Shield's 3. Math Shield's advantage is update cadence (every 2 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Math Shield sells 3 in-app purchases, starting at $3.99 per month. Deep Flow asks for nothing beyond the download.

Deep Flow ships an update monthly, Math Shield every 2 days. The most recent releases landed on September 18, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Deep Flow | Math Shield |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Size | 9 MB | 20 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tejeshwar Amirthy](https://appshunter.io/developer/1824269130) | [Vinoth Ramajeyam](https://appshunter.io/developer/1665205517) |

## What reviewers say

### Deep Flow

[App page](https://appshunter.io/ios/app/deep-flow-screen-time-control/id6748088561)

**In-app purchases:** none


### Math Shield

[App page](https://appshunter.io/ios/app/math-shield-focus-and-unlock/id6774190945)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Math Shield Pro Monthly | $3.99 | per month |
| Math Shield Pro Yearly | $12.99 | per year |
| Math Shield Pro - Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Deep Flow free?

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

### Is Math Shield free?

Math Shield is free to download, with in-app purchases available.

### Do Deep Flow or Math Shield have ads?

Neither Deep Flow nor Math Shield shows ads.

### Which is updated more often, Deep Flow or Math Shield?

Deep Flow ships an update monthly, and Math Shield every 2 days. Most recently, Deep Flow was updated on September 18, 2026 and Math Shield on September 20, 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.*