# OIYN vs Centerline Scheduler

The clearest difference is rating: Centerline Scheduler at 5.0 against OIYN's 4.2. Centerline Scheduler also leads on update cadence (every 2 days vs every 3 weeks). OIYN's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Centerline Scheduler holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 9 and 4 respectively.

OIYN ships an update every 3 weeks, Centerline Scheduler every 2 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | OIYN | Centerline Scheduler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (9 ratings)](https://appshunter.io/ios/app/oiyn/id6773618799/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/centerline-scheduler/id6800510465/reviews)** |
| Number of ratings | **9** | 4 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | Free |
| Size | 100 MB | 16 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Giant Lighting Technology Co., Ltd](https://appshunter.io/developer/1771136894) | [Great Scott! Interactive](https://appshunter.io/developer/553560593) |

## What reviewers say

### OIYN

[App page](https://appshunter.io/ios/app/oiyn/id6773618799)

Control your lights via Bluetooth. This app identifies lighting fixtures, displays signal strength, and allows for dimming, color, and scene adjustments. It also features a music rhythm mode and supports multi-device control through scenarios.

**Highlights:** Bluetooth BLE control, Lighting fixture recognition, Signal strength display, Dimming and color settings, Scene and mode presets, Music rhythm synchronization, Multi-device scenario control

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

**In-app purchases:** none


### Centerline Scheduler

[App page](https://appshunter.io/ios/app/centerline-scheduler/id6800510465)

This app provides pilots with a modern, mobile-first interface for managing flight school and flying club reservations. Book, cancel, and log flights directly from your phone, with features like real-time aircraft alerts and Google Calendar sync.

**Highlights:** Book, cancel, preflight, and postflight logging, Dashboard with bookings, currency, and balance, Day/Week schedule view with fleet details, One-tap booking for available slots, Aircraft change and grounding alerts, Instructor-student pairing and currency sharing, Google Calendar synchronization

**In-app purchases:** none


## Frequently asked questions

### Is OIYN free?

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

### Is Centerline Scheduler free?

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

### Which has better reviews, OIYN or Centerline Scheduler?

Centerline Scheduler is rated higher. OIYN averages 4.2 out of 5 from 9 ratings, while Centerline Scheduler averages 5.0 from 4 ratings.

### Do OIYN or Centerline Scheduler have ads?

Neither OIYN nor Centerline Scheduler shows ads.

### Which is updated more often, OIYN or Centerline Scheduler?

OIYN ships an update every 3 weeks, and Centerline Scheduler every 2 days. Most recently, OIYN was updated on October 28, 2026 and Centerline Scheduler on October 24, 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.*