# RC Circuit vs Weeklet

The clearest difference is in-app purchases: Weeklet at none against RC Circuit's 1. RC Circuit's advantage is iOS requirement (12.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. RC Circuit sells 1 one-off in-app purchase. Weeklet asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on October 5, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | RC Circuit | Weeklet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/rc-circuit/id824460716/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | Every 6 months |
| Monetization | Free | — |
| Size | 16 MB | 12 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Hiroaki Matsuno](https://appshunter.io/developer/1729659390) |

## What reviewers say

### RC Circuit

[App page](https://appshunter.io/ios/app/rc-circuit/id824460716)

Calculate RC charging and filter circuits, including time constants and cutoff frequencies. Find component values from these parameters or get voltage at specific times. Save and share data easily.

**Highlights:** Calculate time constant, Find component values, Get voltage at time t, Calculate cutoff frequency, Save data to CSV, Upload CSV via AirDrop/iCloud Drive, Multi-language support

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro features | $0.99 | one-time |


### Weeklet

[App page](https://appshunter.io/ios/app/weeklet-week-number/id6745425508)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RC Circuit free?

RC Circuit is free to download, with in-app purchases available.

### Is Weeklet free?

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

### Do RC Circuit or Weeklet have ads?

Neither RC Circuit nor Weeklet shows ads.

### Which is updated more often, RC Circuit or Weeklet?

RC Circuit ships an update every 6 months, and Weeklet every 6 months. Most recently, RC Circuit was updated on October 5, 2026 and Weeklet on October 12, 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.*