# CalcEngineer vs BUNKO Notes

The clearest difference is in-app purchases: CalcEngineer at none against BUNKO Notes's 1. BUNKO Notes's advantage is iOS requirement (15.1 vs 17). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. BUNKO Notes sells 1 one-off in-app purchase. CalcEngineer asks for nothing beyond the download.

CalcEngineer ships an update every 2 days, BUNKO Notes every 3 days. The most recent releases landed on September 12, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | CalcEngineer | BUNKO Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/calcengineer/id6748969344/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 days |
| Monetization | Free | — |
| Size | 10 MB | 105 MB |
| Requires iOS | 17 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Justin Bush](https://appshunter.io/developer/1828308327) | [ZACHARY MASON KELLER](https://appshunter.io/developer/1883083879) |

## What reviewers say

### CalcEngineer

[App page](https://appshunter.io/ios/app/calcengineer/id6748969344)

This app provides professional engineering calculations for compressed air systems. It helps engineers and technicians determine CFM requirements, size compressors and tanks, and analyze pressure drops for optimized pneumatic systems.

**Highlights:** CFM Calculator, Compressor & Tank Sizing, Pressure Drop Analysis, Flow Velocity & Pipe Sizing, Multiple CFM Entries, General Engineering Calculator Suite

**Features:** macOS Compatibility

**In-app purchases:** none


### BUNKO Notes

[App page](https://appshunter.io/ios/app/bunko-notes/id6760192387)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BUNKO Pro Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is CalcEngineer free?

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

### Is BUNKO Notes free?

BUNKO Notes is free to download, with in-app purchases available.

### Do CalcEngineer or BUNKO Notes have ads?

Neither CalcEngineer nor BUNKO Notes shows ads.

### Which is updated more often, CalcEngineer or BUNKO Notes?

CalcEngineer ships an update every 2 days, and BUNKO Notes every 3 days. Most recently, CalcEngineer was updated on September 12, 2026 and BUNKO Notes on September 20, 2026.

---

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