# Roll Time vs SYSTEM JJ

The clearest difference is in-app purchases: SYSTEM JJ at none against Roll Time's 1. SYSTEM JJ also leads on update cadence (every 3 days vs weekly) and iOS requirement (15.1 vs 18.0). Roll Time's advantage is ratings volume (28 vs 2). On price, rating, ads and monetization model there is nothing between them.

Both are free to download. Roll Time sells 1 one-off in-app purchase. SYSTEM JJ asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Roll Time against 5.0 for SYSTEM JJ. That said, the two scores are not equally well evidenced: Roll Time has 28 ratings behind it against 2, so its average is the more settled of the two.

Roll Time ships an update weekly, SYSTEM JJ every 3 days. The most recent releases landed on October 8, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Roll Time | SYSTEM JJ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (28 ratings)](https://appshunter.io/ios/app/roll-time-bjj-round-timer/id6751762523/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/system-jj/id6760544977/reviews) |
| Number of ratings | **28** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Free | Free |
| Size | 44 MB | 194 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Tsapaev](https://appshunter.io/developer/1033012480) | [Nicholas Hession-Kugelman](https://appshunter.io/developer/1884887934) |

## What reviewers say

### Roll Time

[App page](https://appshunter.io/ios/app/roll-time-bjj-round-timer/id6751762523)

This app is a professional round timer designed for coaches in combat sports like BJJ, MMA, and boxing. It features a large, high-contrast display, customizable sound alerts, and the ability to mirror the timer to a TV for a wall-timer experience. Coaches can save unlimited presets for different training formats and even display their gym's logo.

**Highlights:** Customizable work, warning, and rest intervals, Optional prepare and cooldown phases, Unlimited saved presets for classes and drills, Loud sound and voice alerts, Smart Volume for music adjustment, High-contrast, large timer display, TV mirroring for wall-timer setup, Gym logo display

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Edition | $9.99 | one-time |


### SYSTEM JJ

[App page](https://appshunter.io/ios/app/system-jj/id6760544977)

This training companion helps you master jiu-jitsu by capturing session intentions and feedback. Record audio and video notes, utilize templates, and get AI coaching within the app.

**Highlights:** Capture training session intentions, Record audio notes, Record video notes, Utilize templates, AI coach integration

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

**In-app purchases:** none


## Frequently asked questions

### Is Roll Time free?

Roll Time is free to download, with in-app purchases available.

### Is SYSTEM JJ free?

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

### Which has better reviews, Roll Time or SYSTEM JJ?

Roll Time and SYSTEM JJ are both rated 5.0 out of 5 on the App Store, from 28 and 2 ratings respectively.

### Do Roll Time or SYSTEM JJ have ads?

Neither Roll Time nor SYSTEM JJ shows ads.

### Which is updated more often, Roll Time or SYSTEM JJ?

Roll Time ships an update weekly, and SYSTEM JJ every 3 days. Most recently, Roll Time was updated on October 8, 2026 and SYSTEM JJ on October 19, 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.*