Joint Locks / Rory Miller

Name: Joint Locks / Rory Miller
Rating: 3.4117646 (334 reviews)
Author: YMAA

By: YMAA

Joint Locks by Rory Miller, author of Meditations on Violence.

Features & Capabilities

Joint Locks by Rory Miller is a comprehensive video app designed to teach users how to improvise joint locks effectively under pressure. Drawing from Rory Miller's extensive experience as a corrections officer and martial artist, this 60-minute instructional tool provides practical lessons on hinge, ball and socket, gliding joints, and finger locks through clear video chapters.

Unlike traditional methods requiring hundreds of hours, Miller's principles-based approach enables beginners to develop useful joint lock techniques in just an hour. Ideal for professionals requiring low-force control and martial arts practitioners seeking realistic defense skills, the app includes free sample videos and affordable in-app purchase access. Developed by YMAA, it embodies practical martial arts knowledge from one of the leading authors in the field, emphasizing real violence realities over dojo myths.

User Growth & Download Statistics

App Education Sports

By:

YMAA

Downloads:

133,246 2

Rating:

3.41

(334)

Version:

1.0.4 Last updated: 2023-01-17

Version code:

Creation date:

2014-10-10

Publisher country:

Permissions:

android.permission.GET_ACCOUNTS Very high risk
android.permission.READ_EXTERNAL_STORAGE High risk
android.permission.WRITE_EXTERNAL_STORAGE High risk
com.google.android.gms.permission.AD_ID Moderate risk
android.permission.ACCESS_WIFI_STATE Low risk
android.permission.INTERNET Low risk
android.permission.POST_NOTIFICATIONS Low risk
android.permission.RECEIVE_BOOT_COMPLETED Low risk
android.permission.WAKE_LOCK Low risk
com.android.vending.BILLING Low risk

Size:

3.65MB

Email:

go*****@ymaa.com

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-06-11

Compare stats and ranking:

Ranking

# 186,755 ▲ 1,526

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Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

YMAA

Google Play Store

https://play.google.com/store/apps/details?id=com.ymaa.jointlocks

Email:

go*****@ymaa.com

Website:

http://www.ymaa.com/publishing

User Reviews

Users find that the 'Joint Locks / Rory Miller' app offers a conceptual and practical approach to learning joint locks, effective especially for beginners and intermediates. However, many users report significant technical problems including frequent crashes, instability after entering email details, incomplete or missing video content, and forced closures. The app's limited free content before purchase and some disappointment over video completeness also affect user experience. Despite these issues, the instructional quality and teaching philosophy receive positive remarks from those able to use the app successfully.

Pros

Provides a conceptual training method focusing on understanding how joints work and how to apply locks dynamically.
Offers a good introduction to joint locks and holds with practical teaching that emphasizes functional usage over memorization of techniques.
Contains informative and valuable content for users, especially those with intermediate experience or less, interested in learning joint lock principles.
The app includes instructional videos that some users found helpful when the app worked correctly.
Reasonably priced content compared to similar training materials.

Cons

App frequently crashes, especially after prompting for email, making it unusable for many users.
Videos are incomplete, do not fully demonstrate moves, or sometimes do not show at all, frustrating users expecting full instruction.
Users experience forced stops and instability leading to inability to use paid features.
The app asks for an email ID but then crashes or closes suddenly, indicating poor stability or bugs.
Limited free content (only first few mini lessons) before requiring a $10 purchase, with some users feeling the introductory content is insufficient to assess value.