# ContextStacker vs Sift

The clearest difference is update cadence: ContextStacker at every 3 days against Sift's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ContextStacker sells 2 in-app purchases, starting at $99.00 per year and Sift sells 3 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ContextStacker ships an update every 3 days, Sift every 2 weeks. The most recent releases landed on September 28, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | ContextStacker | Sift |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 weeks |
| Size | 7 MB | 2 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [鹏源 邱](https://appshunter.io/developer/1042192961) | [Anshul Jain](https://appshunter.io/developer/1823688921) |

## What reviewers say

### ContextStacker

[App page](https://appshunter.io/ios/app/contextstacker/id6774051551)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Annual | $99.00 | per year |
| Business Annual | $199.00 | per year |


### Sift

[App page](https://appshunter.io/ios/app/sift-pdf-scanner-and-ocr/id6792081358)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sift Pro (Weekly) | $6.99 | per 7 days |
| Sift Pro (Yearly) | $34.99 | per year |
| Sift Pro (Lifetime) | $79.99 | one-time |


## Frequently asked questions

### Is ContextStacker free?

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

### Is Sift free?

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

### Do ContextStacker or Sift have ads?

Neither ContextStacker nor Sift shows ads.

### Which is updated more often, ContextStacker or Sift?

ContextStacker ships an update every 3 days, and Sift every 2 weeks. Most recently, ContextStacker was updated on September 28, 2026 and Sift on September 29, 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.*