# GyLog — Camera Metadata Logger

> Camera Metadata Logger (iPhone/iPad app by Kumo, Inc..)

- Source: https://appshunter.io/ios/app/gylog/id6759689665 (this page in markdown: same URL + `.md`)
- Developer: [Kumo, Inc.](https://appshunter.io/developer/955162378)
- Category: Utilities, Photo & Video
- Price: Free with in-app purchases (on sale, was $9.99)
- Age rating: 4+
- Requires: iOS 17.5 · 7 MB
- Languages: American English
- Released: 2026-03-04
- Data updated: 2026-08-04
- User reviews in markdown: https://appshunter.io/ios/app/gylog/id6759689665/reviews.md

## What is GyLog?

GyLog is a motion data logger for Gyroflow stabilization. Record gyroscope 
and accelerometer data from your iPhone's sensors in GCSV format — for custom 
post-stabilization of your own iPhone footage, or for pairing with any 
mirrorless or cinema camera.

TWO WAYS TO USE

With your iPhone — While iPhone Action Mode and LOG bring built-in stabilization, 
GyLog hands the control back to you. Stabilize in Gyroflow with your own 
smoothness, cropping, and rolling-shutter settings — beyond what automatic 
processing decides for you.

With a mirrorless or cinema camera — Mount your iPhone on any camera with a 
cold shoe adapter. GyLog turns your iPhone into a dedicated Gyroflow log 
recorder, capturing the motion your camera can't, so you can stabilize its 
footage in post.

KEY FEATURES
• GCSV format — directly compatible with Gyroflow
• Background motion logging — keeps recording even when screen is locked
• Mount angle calibration — automatically detects phone orientation
• Audio sync backup — optional low-bitrate audio track for drift correction
• High sampling rate — up to ~100 Hz on supported devices
• File management — filter, select, share, and delete recordings
• AirDrop & Files app — easily export logs to your Mac for processing

PRIVACY FIRST
GyLog does not collect any personal data. All recordings are stored locally 
on your device and are never uploaded to any server. Audio sync files are 
stored locally and can be deleted at any time.

HOW IT WORKS
1. Mount your iPhone on your camera, or hold it while shooting iPhone video
2. Tap "Calibrate Mount" to detect the phone angle
3. Press Start and begin filming
4. When done, export the GCSV file to your Mac
5. Import into Gyroflow for custom post-stabilization

ABOUT GCSV FORMAT
GCSV (Gyroflow CSV) is the standard format used by Gyroflow for external 
gyroscope data. GyLog outputs all 6 axes of motion data (3-axis gyroscope 
+ 3-axis accelerometer) with nanosecond-precision timestamps.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| GyLog Pro | $14.99 | per year |



## Version history (last 5 releases)

### 2.0.5 — 2026-07-30

Mount angle values now match Gyroflow's Pitch and Roll fields directly when using an external camera, so you no longer need to swap them.

### 2.0.5 — 2026-07-30

Mount angle values now match Gyroflow's Pitch and Roll fields directly when using an external camera, so you no longer need to swap them.

### 2.0.4 — 2026-07-16

Adds a lifetime purchase option for GyLog Pro while keeping the existing annual subscription with a 14-day free trial.

### 2.0.3 — 2026-07-01

Adds a lifetime purchase option for GyLog Pro while keeping the existing annual subscription with a 14-day free trial.

### 2.0.1 — 2026-06-10

Added a User Guide link in Settings.

## Apps similar to GyLog

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| --- | --- | --- | --- |
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## More apps by Kumo, Inc.

- [Pocket Log Camera](https://appshunter.io/ios/app/pocket-log-camera/id6781481870)

All apps by Kumo, Inc.: https://appshunter.io/developer/955162378

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-04.*