# Electronic Circuits Calc Pro vs Bus Connection

The clearest difference is price: Bus Connection at Free against Electronic Circuits Calc Pro's $4.99. Bus Connection also leads on iOS requirement (13.0 vs 16.0). Electronic Circuits Calc Pro's advantage is update cadence (every 6 weeks vs every 4 months) and chart position (#193 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Bus Connection is free to download; Electronic Circuits Calc Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Electronic Circuits Calc Pro ships an update every 6 weeks, Bus Connection every 4 months. The most recent releases landed on September 16, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Electronic Circuits Calc Pro | Bus Connection |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Best chart rank | **#193** | — |
| Size | 19 MB | 32 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [QUESTAR AUTO TECHNOLOGIES LTD](https://appshunter.io/developer/916723518) |

## What reviewers say

### Electronic Circuits Calc Pro

[App page](https://appshunter.io/ios/app/electronic-circuits-calc-pro/id1658493129)

**Currently charting:** #193 Top Paid · Utilities (US App Store)

**Features:** Vision Pro support

**In-app purchases:** none


### Bus Connection

[App page](https://appshunter.io/ios/app/bus-connection/id6657950289)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Electronic Circuits Calc Pro free?

Electronic Circuits Calc Pro costs $4.99, with no in-app purchases.

### Is Bus Connection free?

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

### Do Electronic Circuits Calc Pro or Bus Connection have ads?

Neither Electronic Circuits Calc Pro nor Bus Connection shows ads.

### Which is updated more often, Electronic Circuits Calc Pro or Bus Connection?

Electronic Circuits Calc Pro ships an update every 6 weeks, and Bus Connection every 4 months. Most recently, Electronic Circuits Calc Pro was updated on September 16, 2026 and Bus Connection on September 13, 2026.

---

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