# Lotus vs Filter Calculator

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.

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

## The numbers

| Metric | Lotus | Filter Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | — | Every 5 months |
| Monetization | — | Free with in-app purchases |
| Size | 4 MB | 53 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ryoun Chon Shin](https://appshunter.io/developer/1657565687) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### Lotus

[App page](https://appshunter.io/ios/app/lotus/id1662119746)

**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 Lotus free?

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

### Is Filter Calculator free?

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

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*