# Strobe tachometer (RPM meter) vs Happy VPN

The clearest difference is review sentiment: Strobe tachometer (RPM meter) at 69% against Happy VPN's 0%. Strobe tachometer (RPM meter) also leads on ads (none vs shown) and rating (4.3 vs 3.9). Happy VPN's advantage is in-app purchases (none vs 2) and update cadence (every 11 days vs every 4 months). On price, ratings volume and device support there is nothing between them.

Both are free to download. Strobe tachometer (RPM meter) sells 2 one-off in-app purchases. Happy VPN asks for nothing beyond the download.

Strobe tachometer (RPM meter) holds the better App Store score, 4.3 against 3.9. Both are backed by a comparable volume of ratings — 83 and 37 respectively. Written reviews point the same way: 69% of Strobe tachometer (RPM meter)'s written reviews are positive against 0% of Happy VPN's.

Strobe tachometer (RPM meter) ships an update every 4 months, Happy VPN every 11 days. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Strobe tachometer (RPM meter) | Happy VPN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (83 ratings)](https://appshunter.io/ios/app/strobe-tachometer-rpm-meter/id831460940/reviews)** | [3.9 (37 ratings)](https://appshunter.io/ios/app/happy-vpn/id1614417721/reviews) |
| Number of ratings | **83** | 37 |
| Positive reviews | **69.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 11 days** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 16 MB | 66 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dmitriy Kharutskiy](https://appshunter.io/developer/817385891) | [MoboTap Inc.](https://appshunter.io/developer/433626481) |

## What reviewers say

### Strobe tachometer (RPM meter)

[App page](https://appshunter.io/ios/app/strobe-tachometer-rpm-meter/id831460940)

Measure rotational speeds of objects using your phone's flashlight, laser, or magnetic sensor. Detect precise RPMs with adjustable flicker frequencies and a wide measurement range. Ideal for analyzing fan speeds, engine RPMs, and more.

**Highlights:** Strobe tachometer function, Laser tachometer mode, Magnetic tachometer mode, Adjustable flicker frequency, RPM and Hz display, High precision measurement

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version of the stroboscopic tachometer | $2.99 | one-time |
| Laser Tachometer and Magnetic | $2.99 | one-time |


### Happy VPN

[App page](https://appshunter.io/ios/app/happy-vpn/id1614417721)

This free proxy app offers fast and secure internet access, protecting your privacy and WiFi hotspot. Connect with one tap to browse sites and apps anonymously and securely.

**Highlights:** Free and unlimited access, One-tap connection, Protects privacy and WiFi security, Fast and stable connection, Works with all mobile data carriers

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

**In-app purchases:** none


## Frequently asked questions

### Is Strobe tachometer (RPM meter) free?

Strobe tachometer (RPM meter) is free to download, with in-app purchases available.

### Is Happy VPN free?

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

### Which has better reviews, Strobe tachometer (RPM meter) or Happy VPN?

Strobe tachometer (RPM meter) is rated higher. Strobe tachometer (RPM meter) averages 4.3 out of 5 from 83 ratings, while Happy VPN averages 3.9 from 37 ratings.

### Do Strobe tachometer (RPM meter) or Happy VPN have ads?

Happy VPN shows ads; Strobe tachometer (RPM meter) does not.

### Which is updated more often, Strobe tachometer (RPM meter) or Happy VPN?

Strobe tachometer (RPM meter) ships an update every 4 months, and Happy VPN every 11 days. Most recently, Strobe tachometer (RPM meter) was updated on October 21, 2026 and Happy VPN on October 24, 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.*