# SJJIF vs Dirty Knife Timer

The clearest difference is update cadence: Dirty Knife Timer at weekly against SJJIF's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

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

SJJIF ships an update every 2 months, Dirty Knife Timer weekly. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SJJIF | Dirty Knife Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sjjif/id6670794033/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free | — |
| Size | 28 MB | 6 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sports Jiu-Jitsu International Federation](https://appshunter.io/developer/1767621648) | [Shun Man Leung](https://appshunter.io/developer/1684190351) |

## What reviewers say

### SJJIF

[App page](https://appshunter.io/ios/app/sjjif/id6670794033)

Manage your sports event registrations and view fight schedules. Discover upcoming events happening near you. This official app is designed for members of the organization.

**Highlights:** Manage event registrations, View fight schedules, Discover upcoming events, Official member app, Event location discovery

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

**In-app purchases:** none


### Dirty Knife Timer

[App page](https://appshunter.io/ios/app/dirty-knife-timer/id6751469127)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SJJIF free?

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

### Is Dirty Knife Timer free?

Dirty Knife Timer is free to download, with no in-app purchases.

### Do SJJIF or Dirty Knife Timer have ads?

Neither SJJIF nor Dirty Knife Timer shows ads.

### Which is updated more often, SJJIF or Dirty Knife Timer?

SJJIF ships an update every 2 months, and Dirty Knife Timer weekly. Most recently, SJJIF was updated on October 20, 2026 and Dirty Knife Timer on October 25, 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.*