JBM Dry Fire vs Dirty Knife Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JBM Dry Fire
This app provides voice-guided dry fire drills for sports training. It automates staging and par time calculations for efficient practice sessions. Execute drills with a single button press.
- Voice-guided dry fire drills
- Automatic staging calculations
- Automatic par time calculations
- Single button drill execution
- Customizable drill parameters
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Implements Steve Anderson's dry fire drills with voice prompts and automatic staging and par time calculations. Allows execution of a drill with a single button press. Not affiliated with Steve Anderson.
Dirty Knife Timer
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This application is used to train quick-draw knife techniques, recording draw speed as a timer to enhance self-defense ability. We utilize the iPhone’s accelerometer to achieve this. Instructions: 1. Set your phone’s volume to maximum. 2. Set the countdown timer (can be a fixed time or random). 3. During the countdown, do not turn off the screen. Place the phone in your pocket. 4. When you hear the beep, immediately draw your knife. 5. The moment you come to a complete stop after drawing, the app will use accelerometer data to determine that you have finished the draw, thus calculating the time it took to draw the knife. Thank you to Matei Florin for inspiring me.
Screenshots
Verdict
The clearest difference is update cadence: Dirty Knife Timer at weekly against JBM Dry Fire's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
JBM Dry Fire ships an update every 4 months, Dirty Knife Timer weekly. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.
| Parameter | JBM Dry Fire | Dirty Knife Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (5 ratings) — better | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 4 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 6 MB |
| Age rating | 12+ | 4+ |
| Developer | James Millard | Shun Man Leung |
In-app purchases
JBM Dry Fire
No in-app purchases
Dirty Knife Timer
No in-app purchases
Questions
Is JBM Dry Fire free?
Is Dirty Knife Timer free?
Do JBM Dry Fire or Dirty Knife Timer have ads?
Which is updated more often, JBM Dry Fire or Dirty Knife Timer?
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