# SINO vs Stackbox

The clearest difference is iOS requirement: Stackbox at 18.0 against SINO's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. SINO sells 3 in-app purchases, starting at $3.99 per month and Stackbox sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

SINO ships an update every 5 days, Stackbox every 4 days. The most recent releases landed on October 8, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SINO | Stackbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 4 days** |
| Size | 15 MB | 33 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Gibeom Lee](https://appshunter.io/developer/1758120295) | [YunJae Jeong](https://appshunter.io/developer/1568287924) |

## What reviewers say

### SINO

[App page](https://appshunter.io/ios/app/sino-focus-for-goals/id6752213406)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SINO Plus Monthly | $3.99 | per month |
| SINO Plus Annual | $39.99 | per year |
| SINO Lifetime | $19.99 | one-time |


### Stackbox

[App page](https://appshunter.io/ios/app/stackbox-rss-reader/id6758572761)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $1.99 | per month |
| Yearly Plan | $19.99 | per year |


## Frequently asked questions

### Is SINO free?

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

### Is Stackbox free?

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

### Do SINO or Stackbox have ads?

Neither SINO nor Stackbox shows ads.

### Which is updated more often, SINO or Stackbox?

SINO ships an update every 5 days, and Stackbox every 4 days. Most recently, SINO was updated on October 8, 2026 and Stackbox on October 10, 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.*