# Troll Master Depth Calculator vs Vulture Systems

The clearest difference is review sentiment: Troll Master Depth Calculator at 66% against Vulture Systems's 0%. Troll Master Depth Calculator also leads on rating (3.8 vs 3.0) and update cadence (monthly vs every 6 months). Vulture Systems's advantage is in-app purchases (none vs 3). On price, ads and device support there is nothing between them.

Both are free to download. Troll Master Depth Calculator sells 3 in-app purchases, starting at $4.99 per month. Vulture Systems asks for nothing beyond the download.

Troll Master Depth Calculator holds the better App Store score, 3.8 against 3.0. That said, the two scores are not equally well evidenced: Troll Master Depth Calculator has 73 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 66% of Troll Master Depth Calculator's written reviews are positive against 0% of Vulture Systems's.

Troll Master Depth Calculator ships an update monthly, Vulture Systems every 6 months. Both last shipped on October 22, 2026.

## The numbers

| Metric | Troll Master Depth Calculator | Vulture Systems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (73 ratings)](https://appshunter.io/ios/app/troll-master-depth-calculator/id1459946758/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/vulture-systems/id1616348039/reviews) |
| Number of ratings | **73** | 1 |
| Positive reviews | **65.9% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 51 MB | 61 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trevor Lewis](https://appshunter.io/developer/1459946757) | [Vulture Systems, LLC](https://appshunter.io/developer/1616348041) |

## What reviewers say

### Troll Master Depth Calculator

[App page](https://appshunter.io/ios/app/troll-master-depth-calculator/id1459946758)

This app calculates the precise trolling depth of your fishing lure based on various factors like line, lure type, and speed. It also allows for the creation of custom dive charts for at-home planning. Ideal for anglers targeting a wide range of freshwater and saltwater species.

**Highlights:** Calculate trolling depth, Create custom dive charts, Select line, lure, and weights, Adjust factors like speed and length, Physics-based calculations, On-water testing verified

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per month |
| Annual Subscription | $19.99 | per year |
| Lifetime Purchase | $49.99 | one-time |

**What reviewers like**

- 👍 Easy to use and convenient
- 🎯 Accurate depth calculations
- 🎣 Great for trolling
- 💡 Constantly adding new lures
- 🚀 Fast and efficient

**What reviewers complain about**

- 👎 Limited lure selection
- 🐛 Buggy in certain configurations
- 🤷‍♂️ Inaccurate dive curves
- ❌ Does not work in some configurations
- 🚫 Upgrade doesn't always unlock features

**Reported bugs**

- App does not work
- No results found even with inputs
- Upgrade not working
- Dive curves are not accurate
- App throws errors

**Requested features**

- Add saltwater trolling lures
- Include Yo-Zuri, MagBay, Ilander lures
- Update and add new baits
- Add leadcore trolling option
- More lure selection from major manufacturers


### Vulture Systems

[App page](https://appshunter.io/ios/app/vulture-systems/id1616348039)

Monitor fishing gear remotely with long-range sensors and a smartphone app. Receive instant alarms, customize sounds, and log catches with detailed information and photos. Share your successes with friends.

**Highlights:** Long-range sensor monitoring, Real-time smartphone alarms, Customizable alarm sounds, Detailed catch logging, Catch sharing capabilities, Remote sensor control, Firmware updates via app

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Troll Master Depth Calculator free?

Troll Master Depth Calculator is free to download, with in-app purchases available.

### Is Vulture Systems free?

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

### Which has better reviews, Troll Master Depth Calculator or Vulture Systems?

Troll Master Depth Calculator is rated higher. Troll Master Depth Calculator averages 3.8 out of 5 from 73 ratings, while Vulture Systems averages 3.0 from 1 ratings.

### Do Troll Master Depth Calculator or Vulture Systems have ads?

Neither Troll Master Depth Calculator nor Vulture Systems shows ads.

### Which is updated more often, Troll Master Depth Calculator or Vulture Systems?

Troll Master Depth Calculator ships an update monthly, and Vulture Systems every 6 months. Most recently, Troll Master Depth Calculator was updated on October 22, 2026 and Vulture Systems on October 22, 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.*