# Bweb Events vs Duct Calculator

The clearest difference is in-app purchases: Bweb Events at none against Duct Calculator's 1. Bweb Events also leads on update cadence (every 5 days vs fortnightly) and iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Duct Calculator sells 1 in-app purchase, starting at $9.99 per year. Bweb Events asks for nothing beyond the download.

Bweb Events ships an update every 5 days, Duct Calculator fortnightly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Bweb Events | Duct Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Fortnightly |
| Size | 47 MB | 8 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Harshal Shah](https://appshunter.io/developer/1801910523) | [Vladimir Lukashov](https://appshunter.io/developer/6783697231) |

## What reviewers say

### Bweb Events

[App page](https://appshunter.io/ios/app/bweb-events/id6744240774)

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

**In-app purchases:** none


### Duct Calculator

[App page](https://appshunter.io/ios/app/duct-calculator-hvac-sizing/id6789039757)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ductulator Pro | $9.99 | per year |


## Frequently asked questions

### Is Bweb Events free?

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

### Is Duct Calculator free?

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

### Do Bweb Events or Duct Calculator have ads?

Neither Bweb Events nor Duct Calculator shows ads.

### Which is updated more often, Bweb Events or Duct Calculator?

Bweb Events ships an update every 5 days, and Duct Calculator fortnightly. Most recently, Bweb Events was updated on October 30, 2026 and Duct Calculator on October 31, 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.*