# Deflection Lite vs IDYL PM

The clearest difference is update cadence: Deflection Lite at every 3 months against IDYL PM's every 8 months. Deflection Lite also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.4). On price, ads and in-app purchases there is nothing between them.

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

Deflection Lite ships an update every 3 months, IDYL PM every 8 months. The most recent releases landed on October 4, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Deflection Lite | IDYL PM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (46 ratings)](https://appshunter.io/ios/app/deflection-lite/id974474071/reviews)** | — |
| Number of ratings | **46** | — |
| Positive reviews | 44.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 8 months |
| Monetization | Paid | — |
| Size | 108 MB | 14 MB |
| Requires iOS | **15.0** | 17.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Blue Ketchep](https://appshunter.io/developer/1131834248) | [Productivity Associates](https://appshunter.io/developer/1492861795) |

## What reviewers say

### Deflection Lite

[App page](https://appshunter.io/ios/app/deflection-lite/id974474071)

This app provides interactive and precise structural beam analysis. Easily visualize beam bending by dragging loads and supports, and calculate key engineering results like reactions, shear force, and bending moment.

**Highlights:** Interactive beam bending visualization, Calculate reactions, shear force, and bending moment, Built-in cross-section databases, Unlimited loads and supports, Export design to shareable permalink, Metric and standard units

**Features:** Vision Pro support

**In-app purchases:** none


### IDYL PM

[App page](https://appshunter.io/ios/app/idyl-pm/id1494667851)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Deflection Lite free?

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

### Is IDYL PM free?

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

### Do Deflection Lite or IDYL PM have ads?

Neither Deflection Lite nor IDYL PM shows ads.

### Which is updated more often, Deflection Lite or IDYL PM?

Deflection Lite ships an update every 3 months, and IDYL PM every 8 months. Most recently, Deflection Lite was updated on October 4, 2026 and IDYL PM on September 20, 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.*