# js vs PROSTA

The clearest difference is ads: js at none against PROSTA's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

js ships an update every 2 months, PROSTA every 6 weeks. The most recent releases landed on October 2, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | js | PROSTA |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 42.9% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | — | Ad-supported |
| Size | 1 MB | 23 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Hiroyuki Nakano](https://appshunter.io/developer/1091174971) | [masanori takata](https://appshunter.io/developer/1253822521) |

## What reviewers say

### js

[App page](https://appshunter.io/ios/app/js-star/id1382126067)

**Features:** macOS Compatibility

**In-app purchases:** none


### PROSTA

[App page](https://appshunter.io/ios/app/prosta/id1494633664)

Perform statistical calculations and create graphs easily on your mobile device. This app simplifies complex statistical analysis, offering features like data input, instant calculations, customizable graph generation, and a statistical term search function. It's designed for quick analysis without needing a computer.

**Highlights:** Easy statistical calculations, Instant data analysis, Customizable graph creation, Statistical term search, Random number generation for simulations, Distribution tables

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is js free?

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

### Is PROSTA free?

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

### Do js or PROSTA have ads?

PROSTA shows ads; js does not.

### Which is updated more often, js or PROSTA?

js ships an update every 2 months, and PROSTA every 6 weeks. Most recently, js was updated on October 2, 2026 and PROSTA on October 4, 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.*