# Millrace vs NumFlow

The clearest difference is ads: Millrace at none against NumFlow's shown. NumFlow's advantage is update cadence (every 4 days vs every 3 weeks) and iOS requirement (16.6 vs 18.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Millrace sells 9 one-off in-app purchases and NumFlow sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Millrace ships an update every 3 weeks, NumFlow every 4 days. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Millrace | NumFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 294 MB | 8 MB |
| Requires iOS | 18.0 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Antti Aittamaa](https://appshunter.io/developer/1855943133) | [Mustafa Ofluoglu](https://appshunter.io/developer/6794329369) |

## What reviewers say

### Millrace

[App page](https://appshunter.io/ios/app/millrace-tile-delivery-puzzle/id6759511759)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 Undos | $0.99 | one-time |
| Summer Pack | $1.99 | one-time |
| Designer Pack 1 | $1.99 | one-time |
| Designer Pack 2 | $1.99 | one-time |
| Support the Developer | $1.99 | one-time |
| Winter Pack | $1.99 | one-time |
| 50 Undos | $2.99 | one-time |
| 200 Undos | $5.99 | one-time |
| Complete Collection | $5.99 | one-time |


### NumFlow

[App page](https://appshunter.io/ios/app/numflow-number-puzzle/id6812376955)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50 Hints | $4.99 | one-time |
| Remove Ads | $7.99 | one-time |
| 100 Hints | $8.99 | one-time |
| 300 Hints | $14.99 | one-time |


## Frequently asked questions

### Is Millrace free?

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

### Is NumFlow free?

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

### Do Millrace or NumFlow have ads?

NumFlow shows ads; Millrace does not.

### Which is updated more often, Millrace or NumFlow?

Millrace ships an update every 3 weeks, and NumFlow every 4 days. Most recently, Millrace was updated on October 25, 2026 and NumFlow on October 9, 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.*