# plunj.co vs SYSTEM JJ

The clearest difference is update cadence: SYSTEM JJ at every 3 days against plunj.co's every 3 weeks. plunj.co's advantage is ratings volume (309 vs 3). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for plunj.co against 5.0 for SYSTEM JJ. That said, the two scores are not equally well evidenced: plunj.co has 309 ratings behind it against 3, so its average is the more settled of the two.

plunj.co ships an update every 3 weeks, SYSTEM JJ every 3 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | plunj.co | SYSTEM JJ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (309 ratings)](https://appshunter.io/ios/app/plunjco/id6746095758/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/system-jj/id6760544977/reviews)** |
| Number of ratings | **309** | 3 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | Free | Free |
| Size | 55 MB | 194 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Momence, Inc.](https://appshunter.io/developer/1577856011) | [Nicholas Hession-Kugelman](https://appshunter.io/developer/1884887934) |

## What reviewers say

### plunj.co

[App page](https://appshunter.io/ios/app/plunjco/id6746095758)

Manage your account, book classes and events, and access on-demand content. Stay connected with announcements, promotions, and shared content. Easily message the team with any questions.

**Highlights:** Account management, Class and event booking, On-demand content access, Direct messaging, Public feed for announcements

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

**In-app purchases:** none


### 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 plunj.co free?

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

### Is SYSTEM JJ free?

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

### Which has better reviews, plunj.co or SYSTEM JJ?

SYSTEM JJ is rated higher. plunj.co averages 5.0 out of 5 from 309 ratings, while SYSTEM JJ averages 5.0 from 3 ratings.

### Do plunj.co or SYSTEM JJ have ads?

Neither plunj.co nor SYSTEM JJ shows ads.

### Which is updated more often, plunj.co or SYSTEM JJ?

plunj.co ships an update every 3 weeks, and SYSTEM JJ every 3 days. Most recently, plunj.co was updated on October 23, 2026 and SYSTEM JJ on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*