# AIMS ENGINEER vs StandbyCalc Battery Calculator

The clearest difference is in-app purchases: AIMS ENGINEER at none against StandbyCalc Battery Calculator's 1. AIMS ENGINEER also leads on update cadence (weekly vs every 5 weeks) and iOS requirement (14.0 vs 17.0). On price, ads and device support there is nothing between them.

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

AIMS ENGINEER ships an update weekly, StandbyCalc Battery Calculator every 5 weeks. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | AIMS ENGINEER | StandbyCalc Battery Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 weeks |
| Size | 31 MB | 3 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 Battery Calculator

[App page](https://appshunter.io/ios/app/standbycalc-battery-calculator/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 Battery Calculator free?

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

### Do AIMS ENGINEER or StandbyCalc Battery Calculator have ads?

Neither AIMS ENGINEER nor StandbyCalc Battery Calculator shows ads.

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

AIMS ENGINEER ships an update weekly, and StandbyCalc Battery Calculator every 5 weeks. Most recently, AIMS ENGINEER was updated on November 3, 2026 and StandbyCalc Battery Calculator on November 5, 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.*