# Little Grey Book vs ThreadMapper

The clearest difference is rating: Little Grey Book at 4.5 against ThreadMapper's 3.7. Little Grey Book also leads on in-app purchases (none vs 2). ThreadMapper's advantage is update cadence (every 4 days vs every 3 months) and device support (3 vs 1). On price, ratings volume, ads and iOS requirement there is nothing between them.

Both are free to download. ThreadMapper sells 2 one-off in-app purchases. Little Grey Book asks for nothing beyond the download.

Little Grey Book holds the better App Store score, 4.5 against 3.7. Both are backed by a comparable volume of ratings — 4 and 3 respectively.

Little Grey Book ships an update every 3 months, ThreadMapper every 4 days. The most recent releases landed on November 4, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Little Grey Book | ThreadMapper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4 ratings)](https://appshunter.io/ios/app/little-grey-book/id6499083339/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/threadmapper/id6794255629/reviews) |
| Number of ratings | **4** | 3 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 13 MB | 40 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 9+ | 4+ |
| Developer | [niv ben-porath](https://appshunter.io/developer/896424268) | [Tintin Razavian](https://appshunter.io/developer/6794255631) |

## What reviewers say

### Little Grey Book

[App page](https://appshunter.io/ios/app/little-grey-book/id6499083339)

Enhance your Agatha Christie reading experience with a companion app. Track your progress, take notes with text scanning, and test your detective skills with a "Whodunnit Challenge." Explore the complete novel collection and personalize your reading journey.

**Highlights:** Whodunnit Challenge, Text scanning note-taking, Home screen widgets, Complete novel collection, Monthly read notifications, Personalization options, Book filtering by status

**Features:** macOS Compatibility

**In-app purchases:** none


### ThreadMapper

[App page](https://appshunter.io/ios/app/threadmapper/id6794255629)

Diagnose your smart home's Thread network health with at-a-glance grades and detailed issue breakdowns. Monitor device status, battery levels, and network connections. Offers advanced AI insights and AR mapping for deeper troubleshooting.

**Highlights:** Network health grade and issue breakdown, Device and battery status monitoring, Mesh map visualization, Offline alerts with quiet respect, AI-powered insights and troubleshooting, AR room mapping and X-Ray view

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Lifetime | $7.99 | one-time |
| FIELD Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Little Grey Book free?

Little Grey Book is free to download, with no in-app purchases.

### Is ThreadMapper free?

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

### Which has better reviews, Little Grey Book or ThreadMapper?

Little Grey Book is rated higher. Little Grey Book averages 4.5 out of 5 from 4 ratings, while ThreadMapper averages 3.7 from 3 ratings.

### Do Little Grey Book or ThreadMapper have ads?

Neither Little Grey Book nor ThreadMapper shows ads.

### Which is updated more often, Little Grey Book or ThreadMapper?

Little Grey Book ships an update every 3 months, and ThreadMapper every 4 days. Most recently, Little Grey Book was updated on November 4, 2026 and ThreadMapper on November 10, 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.*