# KFEI SensorKit vs Codex Relay

The clearest difference is update cadence: Codex Relay at every 9 days against KFEI SensorKit's every 41 months. Codex Relay also leads on chart position (#36 vs unranked) and iOS requirement (16.4 vs 18.0). 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.

KFEI SensorKit ships an update every 41 months, Codex Relay every 9 days. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | KFEI SensorKit | Codex Relay |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (56 ratings)](https://appshunter.io/ios/app/codex-relay-remote-codex-app/id6764463488/reviews)** |
| Number of ratings | — | **56** |
| Positive reviews | — | 63.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 9 days** |
| Monetization | — | Free |
| Best chart rank | — | **#36** |
| Size | 12 MB | 118 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [KAGA FEI Co., Ltd.](https://appshunter.io/developer/1635192113) | [Kang Sungyu](https://appshunter.io/developer/1895791948) |

## What reviewers say

### KFEI SensorKit

[App page](https://appshunter.io/ios/app/kfei-sensorkit/id6446667661)

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

**In-app purchases:** none


### Codex Relay

[App page](https://appshunter.io/ios/app/codex-relay-remote-codex-app/id6764463488)

**Currently charting:** #36 Top Free · Developer Tools (US App Store)

Manage your Codex workflow remotely from your phone. Track active threads, send prompts, review output, and respond to requests. Designed for developers to stay connected to their work without being at their desk.

**Highlights:** Follow Codex conversations remotely, Send prompts and follow-up instructions, Respond to approval and input requests, Attach images for context, Review workspace and thread activity, Manage relay server state, Check usage statistics

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

**In-app purchases:** none


## Frequently asked questions

### Is KFEI SensorKit free?

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

### Is Codex Relay free?

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

### Do KFEI SensorKit or Codex Relay have ads?

Neither KFEI SensorKit nor Codex Relay shows ads.

### Which is updated more often, KFEI SensorKit or Codex Relay?

KFEI SensorKit ships an update every 41 months, and Codex Relay every 9 days. Most recently, KFEI SensorKit was updated on October 8, 2026 and Codex Relay on October 16, 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.*