# PP+ Image Formation vs Astable

The clearest difference is update cadence: Astable at every 2 weeks against PP+ Image Formation's every 3 months. Astable also leads on device support (4 vs 1) and iOS requirement (12.0 vs 18.0). PP+ Image Formation's advantage is price ($1.99 vs $4.99). On ads and in-app purchases there is nothing between them.

PP+ Image Formation costs $1.99 and Astable $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PP+ Image Formation ships an update every 3 months, Astable every 2 weeks. The most recent releases landed on February 1, 2026 and July 8, 2026 respectively.

## The numbers

| Metric | PP+ Image Formation | Astable |
| --- | --- | --- |
| Price | **$1.99** | $4.99 |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | — | Paid |
| Size | 91 MB | 35 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Polyhedron Learning Media, Inc.](https://appshunter.io/developer/458882328) | [家豪 鲁](https://appshunter.io/developer/1665801193) |

## What reviewers say

### PP+ Image Formation

[App page](https://appshunter.io/ios/app/pp-image-formation/id599292005)

**Features:** macOS Compatibility

**In-app purchases:** none


### Astable

[App page](https://appshunter.io/ios/app/astable-structural-mechanics/id1665840344)

This application provides a powerful structural mechanics solver with a graphic editor, code editor, and workspace. It allows for detailed mechanics parameter settings and offers a rich theme color scheme, making it ideal for large screen devices.

**Highlights:** Graphic editor, Code editor, Workspace, Mechanics parameter settings, Rich theme color scheme, Large screen device optimized

**In-app purchases:** none


## Frequently asked questions

### Is PP+ Image Formation free?

PP+ Image Formation costs $1.99, with no in-app purchases.

### Is Astable free?

Astable costs $4.99, with no in-app purchases.

### Do PP+ Image Formation or Astable have ads?

Neither PP+ Image Formation nor Astable shows ads.

### Which is updated more often, PP+ Image Formation or Astable?

PP+ Image Formation ships an update every 3 months, and Astable every 2 weeks. Most recently, PP+ Image Formation was updated on February 1, 2026 and Astable on July 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.*