# Danley Tools vs Filter Calculator

The clearest difference is in-app purchases: Danley Tools at none against Filter Calculator's 1. Danley Tools also leads on ads (none vs shown). Filter Calculator's advantage is update cadence (every 5 months vs every 36 months) and iOS requirement (15.0 vs 17.0). On price, review sentiment and device support there is nothing between them.

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

Danley Tools ships an update every 36 months, Filter Calculator every 5 months. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Danley Tools | Filter Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/danley-tools/id1538456260/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 36 months | **Every 5 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 53 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [sebastian rivas](https://appshunter.io/developer/506708461) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### Danley Tools

[App page](https://appshunter.io/ios/app/danley-tools/id1538456260)

This app provides essential calculators and reference materials for audio engineering professionals and enthusiasts. It offers tools to assist with various calculations needed in sound system design and analysis.

**Highlights:** Audio engineering calculators, Reference materials, Sound system design tools, Analysis assistance

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

**In-app purchases:** none


### 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 | $2.99 | one-time |


## Frequently asked questions

### Is Danley Tools free?

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

### Is Filter Calculator free?

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

### Do Danley Tools or Filter Calculator have ads?

Filter Calculator shows ads; Danley Tools does not.

### Which is updated more often, Danley Tools or Filter Calculator?

Danley Tools ships an update every 36 months, and Filter Calculator every 5 months. Most recently, Danley Tools was updated on October 7, 2026 and Filter Calculator on October 13, 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.*