# Vulk vs String Tension Calc

The clearest difference is update cadence: Vulk at every 3 days against String Tension Calc's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Vulk sells 1 in-app purchase, starting at $34.99 per year and String Tension Calc sells 4 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Vulk ships an update every 3 days, String Tension Calc every 3 weeks. The most recent releases landed on October 8, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Vulk | String Tension Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (19 ratings)](https://appshunter.io/ios/app/vulk-camera-tracker-detector/id6756925778/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 56 MB | 44 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [宝林 辛](https://appshunter.io/developer/1630868858) | [Vasilii Polovnikov](https://appshunter.io/developer/1716165883) |

## What reviewers say

### Vulk

[App page](https://appshunter.io/ios/app/vulk-camera-tracker-detector/id6756925778)

This app helps you detect hidden cameras, trackers, and listening devices to protect your privacy. It uses AI and on-device sensors to scan for suspicious activity in various locations like hotels and rental cars.

**Highlights:** Hidden camera detection, Wireless device scanner, Tag & GPS tracker detection, Car tracker finder, Audio bug detector, 6-layer privacy scanner

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Yearly Access | $34.99 | per year |


### String Tension Calc

[App page](https://appshunter.io/ios/app/string-tension-calc/id6792709631)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | per 7 days |
| Premium | $3.99 | per month |
| Premium | $5.99 | per year |
| Lifetime | $7.99 | one-time |


## Frequently asked questions

### Is Vulk free?

Vulk is free to download, with in-app purchases available.

### Is String Tension Calc free?

String Tension Calc is free to download, with in-app purchases available.

### Do Vulk or String Tension Calc have ads?

Neither Vulk nor String Tension Calc shows ads.

### Which is updated more often, Vulk or String Tension Calc?

Vulk ships an update every 3 days, and String Tension Calc every 3 weeks. Most recently, Vulk was updated on October 8, 2026 and String Tension Calc on September 28, 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.*