Filters vs Clew
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Filters
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.
- 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
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"Filters" is an application for the calculation of electronic filters for the construction of speaker systems. The program automatically calculates the values of electronic components (inductors, capacitors) of electronic filters depending by the desired speaker impedance and the cutoff frequency. The software can calculate and design the circuits (filters) for high, medium, low, sub woofer, etc... first and second order. Once calculated the filter’s circuit the app will automatically design for You the frequency and phase diagrams (Bode plots). Build the speakers of your dreams with "Filters"! Features: - Automatic calculation of the electronic components of the filters for high, medium, low, sub woofers etc... - Display of frequency and phase diagrams (Bode plots) for the calculated values of the circuit’s electronic components - Display electronic circuit’s schema (filter) - Complete theory for formulas/circuits for all the filters implemented in "Filters"
Clew
Capture and organize quotes, notes, and highlights from books, articles, films, and podcasts. Discover connections between your saved content through powerful tagging and intelligent recommendations. This app acts as a digital commonplace book, synced across all your devices.
- Save highlights from books, web, film, TV, and podcasts
- Organize and search saved content
- Discover connections between saved items
- Tagging and intelligent recommendations
- Syncs across all devices
- Camera scanning for book pages
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Clew is the fastest, easiest way to save passages, quotes, and notes from the things you read, watch, and listen to, so you can start discovering connections between everything you save. Remember the last time you wrote in the margin of a novel, only to finish the book and never see that thought again? How many times have you clipped parts of articles, songs, and podcasts and saved them to a note somewhere, hidden and forgotten? Clew is a single place for all your highlights, clips, and favorite lines—stored, organized, and searchable in one place. It's a commonplace book that you'll always have with you, easily searchable and synced between all your devices. Clew helps you connect thoughts across sources, centuries, and media types through powerful tagging and intelligent recommendations. Start discovering connections between everything you've saved from: - Books and poems you read - Movies and TV shows you watch - Podcasts and audiobooks you listen to - Songs you love - Articles you read online or on paper Simply copy-and-paste text into the app, use the Share extension, or scan book pages and documents with your device's camera to save a new highlight. Clew makes it easy to sort and search your highlights by source (author, website, etc.), date saved, publication year, genre, keywords, and more. Build your collection, and watch as you start finding connections and patterns across books, artists, decades, genres, languages, and more. This is your new favorite place to store, sort, and share clippings from all your favorite media, whether it's a mind-blowing plot twist in a novel, a hilarious quote in a movie or play, a devastating song lyric, a grand discovery in an article, or simply a quirky adjective you can't wait to use in your own writing. This is Clew. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Clew at Free against Filters's $0.99. Clew also leads on rating (5.0 vs 3.0) and update cadence (every 3 weeks vs every 40 months). Filters's advantage is in-app purchases (none vs 3) and iOS requirement (16.0 vs 18.0). On ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Clew is free to download; Filters costs $0.99 up front. Clew sells 3 one-off in-app purchases. Filters asks for nothing beyond the download.
Clew holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
Filters ships an update every 40 months, Clew every 3 weeks. The most recent releases landed on October 9, 2026 and October 10, 2026 respectively.
| Parameter | Filters | Clew |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.0 (1 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 40 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 3 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Gianluca Natalini | Thomas Twardzik |
Customer experience
Filters
Clew
In-app purchases
Filters
No in-app purchases
Clew
- Small Tip - $0.99$0.99
- Generous Tip - $2.99$2.99
- Super Tip - $9.99$9.99









