# KEI vs VoltStation

The clearest difference is update cadence: KEI at every 2 weeks against VoltStation's every 3 months. VoltStation's advantage is iOS requirement (13.0 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

KEI ships an update every 2 weeks, VoltStation every 3 months. The most recent releases landed on October 13, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | KEI | VoltStation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Size | 13 MB | 58 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Appademic B.V.](https://appshunter.io/developer/549442191) | [VoltStation B.V](https://appshunter.io/developer/1852947763) |

## What reviewers say

### KEI

[App page](https://appshunter.io/ios/app/kei-week/id1218784042)

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

**In-app purchases:** none


### VoltStation

[App page](https://appshunter.io/ios/app/voltstation/id6755288124)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is KEI free?

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

### Is VoltStation free?

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

### Do KEI or VoltStation have ads?

Neither KEI nor VoltStation shows ads.

### Which is updated more often, KEI or VoltStation?

KEI ships an update every 2 weeks, and VoltStation every 3 months. Most recently, KEI was updated on October 13, 2026 and VoltStation on October 25, 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.*