Comparison

Filters vs Clew

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

"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"

About

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.

Highlights
  • 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
Features
Read full description

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

Filters4 screens
Clew4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Filters versus Clew: the parameters behind the verdict, then further details
ParameterFiltersClew
Price$0.99Free — better
Rating3.0 (1 ratings)5.0 (3 ratings) — better
Positive reviews0.0% of reviews—
Number of ratings13 — better
Update frequencyEvery 40 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhoneiPhone, iPad — better
Requires iOS16.0 — better18.0
Further details — not scored
Size3 MB36 MB
Age rating4+4+
DeveloperGianluca NataliniThomas Twardzik

Customer experience

Filters

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

Clew

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Filters

No in-app purchases

3 purchases

Clew

One-time3
  • Small Tip - $0.99$0.99
  • Generous Tip - $2.99$2.99
  • Super Tip - $9.99$9.99

Questions

Is Filters free?
Filters costs $0.99, with no in-app purchases.
Is Clew free?
Clew is free to download, with in-app purchases available.
Which has better reviews, Filters or Clew?
Clew is rated higher. Filters averages 3.0 out of 5 from 1 ratings, while Clew averages 5.0 from 3 ratings.
Do Filters or Clew have ads?
Neither Filters nor Clew shows ads.
Which is updated more often, Filters or Clew?
Filters ships an update every 40 months, and Clew every 3 weeks. Most recently, Filters was updated on October 9, 2026 and Clew on October 10, 2026.

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