# Filters vs BlitzGTD

The clearest difference is price: BlitzGTD at Free against Filters's $0.99. BlitzGTD also leads on update cadence (every 4 days vs every 40 months) and device support (3 vs 1). Filters's advantage is in-app purchases (none vs 1). On ads and iOS requirement there is nothing between them.

BlitzGTD is free to download; Filters costs $0.99 up front. BlitzGTD sells 1 one-off in-app purchase. Filters asks for nothing beyond the download.

Filters ships an update every 40 months, BlitzGTD every 4 days. The most recent releases landed on October 9, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Filters | BlitzGTD |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/filters/id369326771/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 4 days** |
| Monetization | Paid | — |
| Size | 3 MB | 22 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Gianluca Natalini](https://appshunter.io/developer/348380792) | [Sascha Krug](https://appshunter.io/developer/1698716188) |

## What reviewers say

### Filters

[App page](https://appshunter.io/ios/app/filters/id369326771)

This application assists in calculating electronic filter components for speaker systems. It automatically determines inductor and capacitor values based on desired impedance and cutoff frequency, and designs circuits for various speaker types. Users can visualize frequency and phase diagrams for their custom speaker designs.

**Highlights:** Automatic electronic component calculation, Frequency and phase diagram display (Bode plots), Electronic circuit schema display, Support for various speaker types (high, mid, low, sub), First and second-order filter design, Complete filter theory and formulas

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

**In-app purchases:** none


### BlitzGTD

[App page](https://appshunter.io/ios/app/blitzgtd/id6463464743)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BlitzGTD Pro | $5.99 | one-time |


## Frequently asked questions

### Is Filters free?

Filters costs $0.99, with no in-app purchases.

### Is BlitzGTD free?

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

### Do Filters or BlitzGTD have ads?

Neither Filters nor BlitzGTD shows ads.

### Which is updated more often, Filters or BlitzGTD?

Filters ships an update every 40 months, and BlitzGTD every 4 days. Most recently, Filters was updated on October 9, 2026 and BlitzGTD on October 19, 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.*