# Feynman WTF vs Sift Science

The clearest difference is update cadence: Sift Science at every 2 days against Feynman WTF's weekly. Feynman WTF's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 18.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Feynman WTF sells 2 in-app purchases, starting at $10.00 per month and Sift Science sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Feynman WTF ships an update weekly, Sift Science every 2 days. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Feynman WTF | Sift Science |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Size | 37 MB | 83 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Vrushal Kapadnis](https://appshunter.io/developer/1830846117) | [Shobel LLC](https://appshunter.io/developer/1298270459) |

## What reviewers say

### Feynman WTF

[App page](https://appshunter.io/ios/app/feynman-wtf/id6749510148)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $10.00 | per month |
| Pro Yearly | $99.99 | per year |


### Sift Science

[App page](https://appshunter.io/ios/app/sift-science/id6767901370)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sift Premium Monthly | $4.99 | per month |
| Sift Premium | $39.99 | per year |


## Frequently asked questions

### Is Feynman WTF free?

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

### Is Sift Science free?

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

### Do Feynman WTF or Sift Science have ads?

Neither Feynman WTF nor Sift Science shows ads.

### Which is updated more often, Feynman WTF or Sift Science?

Feynman WTF ships an update weekly, and Sift Science every 2 days. Most recently, Feynman WTF was updated on October 24, 2026 and Sift Science on October 8, 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.*