# Vibration meter vs DaysBetween

The clearest difference is ads: DaysBetween at none against Vibration meter's shown. Vibration meter's advantage is update cadence (monthly vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Vibration meter sells 2 in-app purchases, starting at $0.99 per month and DaysBetween sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Vibration meter ships an update monthly, DaysBetween every 3 months. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Vibration meter | DaysBetween |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (14 ratings)](https://appshunter.io/ios/app/vibration-meter-seismometer/id1373632255/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 51 MB | 2 MB |
| Requires iOS | **16.0** | 16.7 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MYSTIC MOBILE APPS LLC](https://appshunter.io/developer/1481942662) | [Dmitrii Sokolov](https://appshunter.io/developer/1871406561) |

## What reviewers say

### Vibration meter

[App page](https://appshunter.io/ios/app/vibration-meter-seismometer/id1373632255)

Measure the strength of vibrations, tremors, and earthquakes using your phone's built-in seismograph. Visualize seismic movements on graphs, receive real-time Mercalli scale readings, and get instant alerts for seismic shocks. Data can be saved and shared for analysis.

**Highlights:** High-accuracy seismometer, Seismic wave detection, Detailed graphical analysis, Real-time Mercalli scale readings, Instant alerts for seismic shocks, Effortless data autosave, Apple Watch compatibility

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Vibration meter+ | $0.99 | per month |
| Annual Vibration meter+ | $5.99 | per year |


### DaysBetween

[App page](https://appshunter.io/ios/app/daysbetween/id6758201994)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $4.99 | one-time |


## Frequently asked questions

### Is Vibration meter free?

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

### Is DaysBetween free?

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

### Do Vibration meter or DaysBetween have ads?

Vibration meter shows ads; DaysBetween does not.

### Which is updated more often, Vibration meter or DaysBetween?

Vibration meter ships an update monthly, and DaysBetween every 3 months. Most recently, Vibration meter was updated on September 22, 2026 and DaysBetween on September 21, 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.*