# Seismometer vs AddressBook/Contacts Manager

The clearest difference is price: AddressBook/Contacts Manager at Free against Seismometer's $1.99. AddressBook/Contacts Manager also leads on rating (5.0 vs 3.3) and update cadence (every 5 days vs every 13 months). Seismometer's advantage is in-app purchases (none vs 2) and ratings volume (17 vs 1). On ads and device support there is nothing between them.

AddressBook/Contacts Manager is free to download; Seismometer costs $1.99 up front. AddressBook/Contacts Manager sells 2 in-app purchases, starting at $0.99 per 7 days. Seismometer asks for nothing beyond the download.

AddressBook/Contacts Manager holds the better App Store score, 5.0 against 3.3. That said, the two scores are not equally well evidenced: Seismometer has 17 ratings behind it against 1, so its average is the more settled of the two.

Seismometer ships an update every 13 months, AddressBook/Contacts Manager every 5 days. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Seismometer | AddressBook/Contacts Manager |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [3.3 (17 ratings)](https://appshunter.io/ios/app/seismometer/id288966259/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/addressbookcontacts-manager/id6752967295/reviews)** |
| Number of ratings | **17** | 1 |
| Positive reviews | 64.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 2 MB |
| Requires iOS | **8.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) | [Langtian Du](https://appshunter.io/developer/1155770837) |

## What reviewers say

### Seismometer

[App page](https://appshunter.io/ios/app/seismometer/id288966259)

This app uses your device's accelerometer to detect and measure vibrations, shakes, and movements. It calculates the energy of these movements and displays them on a logarithmic scale, offering various signal filters and recording capabilities.

**Highlights:** Measure vibrations and movements, Uses device accelerometer, Calculates energy of movements, Logarithmic scale display, Signal filters, Recordings and CSV export, UDP Streaming

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Sensitive and accurate
- 👍 Great for demonstrating vibrations
- 👍 Useful for photography and audio
- 👍 Visually appealing
- 👍 Clever use of accelerometer

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Inaccurate readings even on flat surfaces
- 🔋 Drains battery quickly
- 🔒 No security or privacy features
- 👎 Limited functionality and customization

**Reported bugs**

- Crashes when trying to view recordings
- Unresponsive controls
- Incompatible with newer iPhone models
- Screen turns off unexpectedly

**Requested features**

- Pause and scroll back through recordings
- Save and email recorded data
- Adjustable sensitivity settings
- Richter scale or other measurement units
- Ability to record and review vibration history


### AddressBook/Contacts Manager

[App page](https://appshunter.io/ios/app/addressbookcontacts-manager/id6752967295)

Effortlessly manage your contacts with automatic backups, smart duplicate detection, and secure storage. Import from various sources and restore from multiple backups. This app works offline and prioritizes your privacy.

**Highlights:** Automatic Backup, Smart Duplicate Detection & Merging, Compare & Restore from Multiple Backups, Import from Google/Yahoo/CSV/VCF, Clean Incomplete Contacts, Secure Storage, Offline Functionality

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AddressBookManager Weekly | $0.99 | per 7 days |
| AddressBookManager one year license | $1.99 | per year |


## Frequently asked questions

### Is Seismometer free?

Seismometer costs $1.99, with no in-app purchases.

### Is AddressBook/Contacts Manager free?

AddressBook/Contacts Manager is free to download, with in-app purchases available.

### Which has better reviews, Seismometer or AddressBook/Contacts Manager?

AddressBook/Contacts Manager is rated higher. Seismometer averages 3.3 out of 5 from 17 ratings, while AddressBook/Contacts Manager averages 5.0 from 1 ratings.

### Do Seismometer or AddressBook/Contacts Manager have ads?

Neither Seismometer nor AddressBook/Contacts Manager shows ads.

### Which is updated more often, Seismometer or AddressBook/Contacts Manager?

Seismometer ships an update every 13 months, and AddressBook/Contacts Manager every 5 days. Most recently, Seismometer was updated on October 27, 2026 and AddressBook/Contacts Manager 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.*