# Find Prime Num vs electronics filter toolkit

The clearest difference is review sentiment: electronics filter toolkit at 100% against Find Prime Num's 50%. Find Prime Num's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. electronics filter toolkit sells 1 one-off in-app purchase. Find Prime Num asks for nothing beyond the download.

Find Prime Num ships an update every 4 days, electronics filter toolkit every 9 months. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Find Prime Num | electronics filter toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/find-prime-num/id1505409395/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 9 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 29 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### Find Prime Num

[App page](https://appshunter.io/ios/app/find-prime-num/id1505409395)

Quickly determine if a number is prime and find one of its factors. This app also measures calculation time to help you benchmark your device's processing speed. Share your results and compare performance with others.

**Highlights:** Calculate prime numbers up to 64-bit integers, Measure processing time for device speed comparison, Find one factor of a non-prime number, Share calculation results, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


### electronics filter toolkit

[App page](https://appshunter.io/ios/app/electronics-filter-toolkit/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 Find Prime Num free?

Find Prime Num is free to download, with no in-app purchases.

### Is electronics filter toolkit free?

electronics filter toolkit is free to download, with in-app purchases available.

### Do Find Prime Num or electronics filter toolkit have ads?

electronics filter toolkit shows ads; Find Prime Num does not.

### Which is updated more often, Find Prime Num or electronics filter toolkit?

Find Prime Num ships an update every 4 days, and electronics filter toolkit every 9 months. Most recently, Find Prime Num was updated on September 10, 2026 and electronics filter toolkit on September 9, 2026.

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