# Strobe tachometer (RPM meter) vs Vsensor

The clearest difference is rating: Strobe tachometer (RPM meter) at 4.3 against Vsensor's 3.0. Strobe tachometer (RPM meter) also leads on ratings volume (83 vs 8) and review sentiment (69% vs 60%). Vsensor's advantage is in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Strobe tachometer (RPM meter) holds the better App Store score, 4.3 against 3.0. That said, the two scores are not equally well evidenced: Strobe tachometer (RPM meter) has 83 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 69% of Strobe tachometer (RPM meter)'s written reviews are positive against 60% of Vsensor's.

Strobe tachometer (RPM meter) ships an update every 4 months, Vsensor every 3 weeks. The most recent releases landed on September 9, 2026 and August 18, 2026 respectively.

## The numbers

| Metric | Strobe tachometer (RPM meter) | Vsensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (83 ratings)](https://appshunter.io/ios/app/strobe-tachometer-rpm-meter/id831460940/reviews)** | [3.0 (8 ratings)](https://appshunter.io/ios/app/vsensor/id1635688804/reviews) |
| Number of ratings | **83** | 8 |
| Positive reviews | **69.0% of reviews** | 60.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 16 MB | 70 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dmitriy Kharutskiy](https://appshunter.io/developer/817385891) | [健成 李](https://appshunter.io/developer/1055522601) |

## 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 |


### Vsensor

[App page](https://appshunter.io/ios/app/vsensor/id1635688804)

This utility app displays environmental data like PAR, CO2, and CO concentrations directly on your phone. It requires compatible external meters to function.

**Highlights:** Displays PAR data, Shows CO2 concentration, Reads CO concentration, Works with external meters, Professional tool

**Features:** macOS Compatibility

**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 Vsensor free?

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

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

Strobe tachometer (RPM meter) is rated higher. Strobe tachometer (RPM meter) averages 4.3 out of 5 from 83 ratings, while Vsensor averages 3.0 from 8 ratings.

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

Neither Strobe tachometer (RPM meter) nor Vsensor shows ads.

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

Strobe tachometer (RPM meter) ships an update every 4 months, and Vsensor every 3 weeks. Most recently, Strobe tachometer (RPM meter) was updated on September 9, 2026 and Vsensor on August 18, 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.*