# AIMS ENGINEER vs StandbyCalc

The clearest difference is in-app purchases: AIMS ENGINEER at none against StandbyCalc's 1. AIMS ENGINEER also leads on ads (none vs shown) and update cadence (weekly vs every 4 months). On price and device support there is nothing between them.

Both are free to download. StandbyCalc sells 1 one-off in-app purchase. AIMS ENGINEER asks for nothing beyond the download.

AIMS ENGINEER ships an update weekly, StandbyCalc every 4 months. The most recent releases landed on October 4, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | AIMS ENGINEER | StandbyCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 4 months |
| Size | 31 MB | 4 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Zhimeng Huang](https://appshunter.io/developer/550876452) | [D4N LTD](https://appshunter.io/developer/1212131887) |

## What reviewers say

### AIMS ENGINEER

[App page](https://appshunter.io/ios/app/aims-engineer/id6450314064)

**Features:** macOS Compatibility

**In-app purchases:** none


### StandbyCalc

[App page](https://appshunter.io/ios/app/standbycalc/id6761339878)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StandbyCalc Pro | $9.99 | one-time |


## Frequently asked questions

### Is AIMS ENGINEER free?

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

### Is StandbyCalc free?

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

### Do AIMS ENGINEER or StandbyCalc have ads?

StandbyCalc shows ads; AIMS ENGINEER does not.

### Which is updated more often, AIMS ENGINEER or StandbyCalc?

AIMS ENGINEER ships an update weekly, and StandbyCalc every 4 months. Most recently, AIMS ENGINEER was updated on October 4, 2026 and StandbyCalc on September 30, 2026.

---

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