# electronics filter toolkit — Passive and Active filter

> Passive and Active filter (iPhone/iPad app by Anas Abubakar.)

- Source: https://appshunter.io/ios/app/electronics-filter-toolkit/id6754560517 (this page in markdown: same URL + `.md`)
- Developer: [Anas Abubakar](https://appshunter.io/developer/1581534101)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 29 MB
- Languages: American English
- Released: 2025-11-12
- Data updated: 2026-08-09
- User reviews in markdown: https://appshunter.io/ios/app/electronics-filter-toolkit/id6754560517/reviews.md

## What is electronics filter toolkit?

Design RC, RL, and RLC filters (2nd–7th order) with Butterworth & Chebyshev alignments, passive crossovers, RLC band-pass/reject, and Twin-T notch—enter specs to instantly get component values and quick Bode insights in a clean, offline-friendly, dark-mode UI for lab, classroom, and audio/embedded work.

What you can design:
-RC & RL filters: low-pass / high-pass, 2nd–7th order
-RLC filters: band-pass & band-reject (notch)
-Butterworth: maximally flat magnitude
-Chebyshev: ripple-tuned sharpness
-Twin-T notch: precise mains or tone suppression
-Passive crossovers: 2-way/3-way starter calculations

Built for engineers, hobbyist and students, it turns specs into trustworthy parts fast—so you can prototype smarter, learn by tweaking, and move from idea to BOM with confidence.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Upgrade to Pro | $2.99 | one-time |



## Version history (last 2 releases)

### 1.1 — 2026-07-27

improved the user interface, added more calculators

### 1.0 — 2025-11-12

No release notes.

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## More apps by Anas Abubakar

- [Electronics docs & calculators](https://appshunter.io/ios/app/electronics-docs-and-calculators/id1581668963)
- [Electronics docs & calcs](https://appshunter.io/ios/app/electronics-docs-and-calcs/id1581885136)
- [Calctronics: Circuit Calc Pro](https://appshunter.io/ios/app/calctronics-circuit-calc-pro/id1583600520)
- [Calctronics: Circuit Calc](https://appshunter.io/ios/app/calctronics-circuit-calc/id1583972990)
- [Fisika - Physics app](https://appshunter.io/ios/app/fisika-physics-app/id1586848633)
- [PhysicsLab - Calculator lite](https://appshunter.io/ios/app/physicslab-calculator-lite/id1587705682)

All apps by Anas Abubakar: https://appshunter.io/developer/1581534101

## Related topics

[kcell filter](https://appshunter.io/ios/topics/kcell-filter) · [earring filter](https://appshunter.io/ios/topics/earring-filter)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-09.*