# Seismometer+ vs NotifyMeWhen

The clearest difference is in-app purchases: Seismometer+ at none against NotifyMeWhen's 2. NotifyMeWhen's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. NotifyMeWhen sells 2 in-app purchases, starting at $2.99 per month. Seismometer+ asks for nothing beyond the download.

## The numbers

| Metric | Seismometer+ | NotifyMeWhen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (82 ratings)](https://appshunter.io/ios/app/seismometer-plus/id6739265160/reviews)** | — |
| Number of ratings | **82** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | — | Every 10 days |
| Monetization | Ad-supported | — |
| Size | 3 MB | 38 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [UniCom Technology](https://appshunter.io/developer/1270764210) | [Lambert Francis](https://appshunter.io/developer/1850217760) |

## What reviewers say

### Seismometer+

[App page](https://appshunter.io/ios/app/seismometer-plus/id6739265160)

Transform your device into a powerful seismometer to measure and visualize vibrations in real time. Track tremors, analyze surface stability, and explore the unseen movements around you with intuitive graphical displays. Perfect for science enthusiasts and the curious.

**Highlights:** Real-time X, Y, Z axis acceleration graphs, Cumulative vibration intensity analysis, Adjustable long-term data recording intervals, Dark mode display, Customizable graph update rates and sensitivity

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

**In-app purchases:** none


### NotifyMeWhen

[App page](https://appshunter.io/ios/app/notifymewhen/id6756548543)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Yearly | $24.99 | per year |


## Frequently asked questions

### Is Seismometer+ free?

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

### Is NotifyMeWhen free?

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

### Do Seismometer+ or NotifyMeWhen have ads?

Seismometer+ shows ads; NotifyMeWhen does not.

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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.*