Lotus vs Filter Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lotus
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Lotus - Matching Network Designer Features - Learning how to matching network works - Computing Voltage, Current and Power across each part - 8 Templates embedded - Visualization of matchable impedance regions.
Filter Calculator
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.
- 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
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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.
Screenshots
Verdict
The clearest difference is in-app purchases: Lotus at none against Filter Calculator's 1. Filter Calculator's advantage is device support. On price and iOS requirement 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
Both are free to download. Filter Calculator sells 1 one-off in-app purchase. Lotus asks for nothing beyond the download.
| Parameter | Lotus | Filter Calculator |
|---|---|---|
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| Update frequency | — | Every 5 months |
| Ads | — | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | — | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryoun Chon Shin | Anas Abubakar |
In-app purchases
Lotus
No in-app purchases
Filter Calculator
- Upgrade to Pro$2.99
Questions
Is Lotus free?
Is Filter Calculator free?
Other comparisons
