# Timer 555 Calculator Pro vs Rifle Shot Timer

The clearest difference is review sentiment: Timer 555 Calculator Pro at 100% against Rifle Shot Timer's 0%. Timer 555 Calculator Pro also leads on rating (4.7 vs 3.0) and in-app purchases (none vs 1). Rifle Shot Timer's advantage is price (Free vs $0.99) and iOS requirement (11.0 vs 13.2). On ratings volume, ads and device support there is nothing between them.

Rifle Shot Timer is free to download; Timer 555 Calculator Pro costs $0.99 up front. Rifle Shot Timer sells 1 one-off in-app purchase. Timer 555 Calculator Pro asks for nothing beyond the download.

Timer 555 Calculator Pro holds the better App Store score, 4.7 against 3.0. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 100% of Timer 555 Calculator Pro's written reviews are positive against 0% of Rifle Shot Timer's.

Timer 555 Calculator Pro ships an update every 3 months, Rifle Shot Timer every 12 months. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Timer 555 Calculator Pro | Rifle Shot Timer |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/timer-555-calculator-pro/id833443125/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/rifle-shot-timer/id1663620526/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 12 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 3 MB | 21 MB |
| Requires iOS | 13.2 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Daniel Yaakob](https://appshunter.io/developer/1538646536) |

## What reviewers say

### Timer 555 Calculator Pro

[App page](https://appshunter.io/ios/app/timer-555-calculator-pro/id833443125)

Calculate parameters for monostable and astable circuits. Find component combinations for desired pulse width or frequency. Share circuit files via iCloud Drive or AirDrop.

**Highlights:** Calculate monostable pulse width, Calculate astable frequency, Find component combinations, Adjust component tolerance, Unlimited combinations (Pro), Share circuit files

**In-app purchases:** none


### Rifle Shot Timer

[App page](https://appshunter.io/ios/app/rifle-shot-timer/id1663620526)

This utility app provides a versatile shot timer for various shooting drills, including single shot, multi-shot, par time, and split time exercises. It offers customizable start delays and optional countdowns with adjustable sensitivity levels.

**Highlights:** Single shot drills, Multi shot drills, Par time drills, Split time drills, Start delays, Optional countdown, Adjustable sensitivity

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ShotTimer Premium | $6.99 | one-time |


## Frequently asked questions

### Is Timer 555 Calculator Pro free?

Timer 555 Calculator Pro costs $0.99, with no in-app purchases.

### Is Rifle Shot Timer free?

Rifle Shot Timer is free to download, with in-app purchases available.

### Which has better reviews, Timer 555 Calculator Pro or Rifle Shot Timer?

Timer 555 Calculator Pro is rated higher. Timer 555 Calculator Pro averages 4.7 out of 5 from 3 ratings, while Rifle Shot Timer averages 3.0 from 2 ratings.

### Do Timer 555 Calculator Pro or Rifle Shot Timer have ads?

Neither Timer 555 Calculator Pro nor Rifle Shot Timer shows ads.

### Which is updated more often, Timer 555 Calculator Pro or Rifle Shot Timer?

Timer 555 Calculator Pro ships an update every 3 months, and Rifle Shot Timer every 12 months. Most recently, Timer 555 Calculator Pro was updated on October 10, 2026 and Rifle Shot Timer on October 6, 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.*