# Filter Calculator vs Nkalan

The clearest difference is in-app purchases: Nkalan at none against Filter Calculator's 1. Nkalan also leads on ads (none vs shown) and update cadence (monthly vs every 5 months). On price and device support there is nothing between them.

Both are free to download. Filter Calculator sells 1 one-off in-app purchase. Nkalan asks for nothing beyond the download.

Filter Calculator ships an update every 5 months, Nkalan monthly. The most recent releases landed on November 6, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Filter Calculator | Nkalan |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 53 MB | 60 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Anas Abubakar](https://appshunter.io/developer/1581534101) | [RobotsMali](https://appshunter.io/developer/1819910388) |

## What reviewers say

### Filter Calculator

[App page](https://appshunter.io/ios/app/filter-calculator-electronics/id6754560517)

Design various types of electronic filters, including RC, RL, RLC, and passive crossovers, with customizable orders and alignments. Instantly obtain component values and Bode insights for lab, classroom, or audio projects. Ideal for engineers, hobbyists, and students.

**Highlights:** Design RC, RL, and RLC filters (2nd-7th order), Butterworth & Chebyshev alignments, Passive crossover calculations, Twin-T notch filter design, Instant component values, Bode insights, Offline-friendly dark mode UI

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Pro | $4.99 | one-time |


### Nkalan

[App page](https://appshunter.io/ios/app/nkalan/id6755342202)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Filter Calculator free?

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

### Is Nkalan free?

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

### Do Filter Calculator or Nkalan have ads?

Filter Calculator shows ads; Nkalan does not.

### Which is updated more often, Filter Calculator or Nkalan?

Filter Calculator ships an update every 5 months, and Nkalan monthly. Most recently, Filter Calculator was updated on November 6, 2026 and Nkalan on October 25, 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.*