# TopOpt vs Input

The clearest difference is in-app purchases: TopOpt at none against Input's 8. TopOpt also leads on device support (3 vs 1) and iOS requirement (11.0 vs 18.0). On price and ads there is nothing between them.

Both are free to download. Input sells 8 in-app purchases, starting at $2.99 per month. TopOpt asks for nothing beyond the download.

## The numbers

| Metric | TopOpt | Input |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/topopt/id507454646/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | — |
| Size | 100 MB | 8 MB |
| Requires iOS | **11.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DTU Mechanical Engineering](https://appshunter.io/developer/507453160) | [Yauheni Surma](https://appshunter.io/developer/1847142682) |

## What reviewers say

### TopOpt

[App page](https://appshunter.io/ios/app/topopt/id507454646)

This app allows users to perform structural optimization using topology optimization methods on their iPad or iPhone. Users can manipulate loads and supports to observe design evolution and experiment with various parameters like volume fractions and grid sizes.

**Highlights:** Topology optimization method, Structural design evolution, Load and support manipulation, Volume fraction experimentation, Grid size adjustments

**Features:** macOS Compatibility

**In-app purchases:** none


### Input

[App page](https://appshunter.io/ios/app/input/id6754215853)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic (monthly) | $2.99 | per month |
| Plus (Monthly) | $6.99 | per month |
| Conversational (Monthly) | $9.99 | per month |
| Pro (Monthly) | $12.99 | per month |
| Basic (6-Month) | $12.99 | per 6 months |
| Plus (6-Month) | $29.99 | per 6 months |
| Conversational (6-Month) | $44.99 | per 6 months |
| Pro (6-Month) | $59.99 | per 6 months |


## Frequently asked questions

### Is TopOpt free?

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

### Is Input free?

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

### Do TopOpt or Input have ads?

Neither TopOpt nor Input shows ads.

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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.*