# Si vs SnapDue

The clearest difference is in-app purchases: Si at none against SnapDue's 7. Si also leads on iOS requirement (9.1 vs 15.6). SnapDue's advantage is update cadence (weekly vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. SnapDue sells 7 in-app purchases, starting at $4.99 per month. Si asks for nothing beyond the download.

Si ships an update every 5 months, SnapDue weekly. The most recent releases landed on November 11, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Si | SnapDue |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Size | 12 MB | 80 MB |
| Requires iOS | **9.1** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [旭日东方](https://appshunter.io/developer/1472957256) | [AB&T Technology Investment Joint Stock Company](https://appshunter.io/developer/1831285450) |

## What reviewers say

### Si

[App page](https://appshunter.io/ios/app/si-link/id1484583420)

**Features:** macOS Compatibility

**In-app purchases:** none


### SnapDue

[App page](https://appshunter.io/ios/app/snapdue-deadline-tracker/id6757809280)

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Snapdue Pro Monthly | $4.99 | per month |
| Snapdue Pro Annual | $39.99 | per year |
| 10 AI Credits | $0.99 | one-time |
| 25 AI Credits | $1.99 | one-time |
| 50 AI Credits | $2.99 | one-time |
| 100 AI Credits | $4.99 | one-time |
| 250 AI Credits | $9.99 | one-time |


## Frequently asked questions

### Is Si free?

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

### Is SnapDue free?

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

### Do Si or SnapDue have ads?

Neither Si nor SnapDue shows ads.

### Which is updated more often, Si or SnapDue?

Si ships an update every 5 months, and SnapDue weekly. Most recently, Si was updated on November 11, 2026 and SnapDue on November 5, 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.*