# DEFA vs Welding Heat Input Calculator

The clearest difference is price: DEFA at Free against Welding Heat Input Calculator's $9.99. DEFA also leads on iOS requirement (12.0 vs 26.2). On update cadence, ads, in-app purchases and device support there is nothing between them.

DEFA is free to download; Welding Heat Input Calculator costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DEFA ships an update every 5 months, Welding Heat Input Calculator every 6 months. The most recent releases landed on June 11, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | DEFA | Welding Heat Input Calculator |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/defa/id542334548/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Free | — |
| Size | 53 MB | 1 MB |
| Requires iOS | **12.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DEFA AS](https://appshunter.io/developer/452232242) | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) |

## What reviewers say

### DEFA

[App page](https://appshunter.io/ios/app/defa/id542334548)

Control DEFA vehicle and home heating, security, and alarm systems remotely. Monitor temperatures, battery voltage, and receive alerts for theft or speed limit breaches. Manage multiple heating zones and integrate with car alarms.

**Highlights:** Remote engine and interior heater control, Monitor battery voltage and temperature, GPS tracking and theft alerts, Burglar alarm notifications, Control up to 6 heating zones, Weather forecast display

**In-app purchases:** none


### Welding Heat Input Calculator

[App page](https://appshunter.io/ios/app/welding-heat-input-calculator/id6760613465)

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

**In-app purchases:** none


## Frequently asked questions

### Is DEFA free?

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

### Is Welding Heat Input Calculator free?

Welding Heat Input Calculator costs $9.99, with no in-app purchases.

### Do DEFA or Welding Heat Input Calculator have ads?

Neither DEFA nor Welding Heat Input Calculator shows ads.

### Which is updated more often, DEFA or Welding Heat Input Calculator?

DEFA ships an update every 5 months, and Welding Heat Input Calculator every 6 months. Most recently, DEFA was updated on June 11, 2026 and Welding Heat Input Calculator on September 24, 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.*