# Delta Overlap vs Napoleon/Lynx Spring Calc

The clearest difference is update cadence: Delta Overlap at every 2 months against Napoleon/Lynx Spring Calc's every 7 months. On price, ads, 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.

Delta Overlap ships an update every 2 months, Napoleon/Lynx Spring Calc every 7 months. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Delta Overlap | Napoleon/Lynx Spring Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/napoleonlynx-spring-calc/id6737538790/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | — | Free |
| Size | 3 MB | 23 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gread Elettronica srl](https://appshunter.io/developer/671539111) | [Napoleon Spring Works](https://appshunter.io/developer/1771529934) |

## What reviewers say

### Delta Overlap

[App page](https://appshunter.io/ios/app/delta-overlap/id674399153)

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

**In-app purchases:** none


### Napoleon/Lynx Spring Calc

[App page](https://appshunter.io/ios/app/napoleonlynx-spring-calc/id6737538790)

This utility app simplifies garage door torsion spring calculations for single and duplex assemblies. It supports various lift types and drums, allowing users to save and share their calculations. Connect with local sales representatives for parts and assistance.

**Highlights:** Calculates torsion springs for single/duplex assemblies, Supports various lift types and drums, Save calculations locally, Share calculations with other apps, Direct contact for sales representatives

**In-app purchases:** none


## Frequently asked questions

### Is Delta Overlap free?

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

### Is Napoleon/Lynx Spring Calc free?

Napoleon/Lynx Spring Calc is free to download, with no in-app purchases.

### Do Delta Overlap or Napoleon/Lynx Spring Calc have ads?

Neither Delta Overlap nor Napoleon/Lynx Spring Calc shows ads.

### Which is updated more often, Delta Overlap or Napoleon/Lynx Spring Calc?

Delta Overlap ships an update every 2 months, and Napoleon/Lynx Spring Calc every 7 months. Most recently, Delta Overlap was updated on October 24, 2026 and Napoleon/Lynx Spring Calc on October 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*