Comparison

Little Grey Book vs ThreadMapper

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Little Grey Book

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
Read full description

Discover the Ultimate Companion for Agatha Christie Enthusiasts! Embark on a thrilling literary adventure with Little Grey Book, the ultimate companion app for fans of Agatha Christie. Whether you're a seasoned sleuth or a newcomer to her captivating mysteries, this app is designed to enhance your reading experience like never before. Key Features: App special - Whodunit Challenge: Unleash your inner detective! As you read, select who you think the culprit is. Once you finish the book, see if you cracked the case. Can you match wits with Agatha Christie herself? Note-Taking Made Easy: Capture your thoughts, theories, favorite quotes, and memorable moments as you read. Use the new text scanning feature to quickly add notes directly from the page. The user-friendly note-taking feature lets you document your detective journey with ease. Handy Widgets: See your latest notes and keep track of your current read with convenient home screen widgets. Complete Novel Collection: Explore Agatha Christie's complete collection of novels, featuring their original covers for an authentic experience. Read Christie Notifications: Enjoy timely alerts for every new Read Christie theme and official monthly read. Personalization: Switch between UK and US book titles or even set your custom title. Choose from the uniquely crafted book icons or add one you prefer. Book Filters: Effortlessly organize your reading list. Filter books by status – unread, in progress, or completed – and maintain a clear overview of your journey through Christie's works. Why Little Grey Book? Little Grey Book is not just an app; it's a gateway into the world of intrigue and suspense. Dive deeper into each story, keep track of your progress, and challenge yourself to solve the mysteries alongside the Queen of Crime. Download Little Grey Book now and turn every reading session into an exciting detective adventure! Special thanks to friend of the app Johanna Draper Carlson for tracking down misidentified villains. ========================================================================== Icon attribution - Question icons created by Freepik - Flaticon (https://www.flaticon.com/free-icons/question)

About

ThreadMapper

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
Read full description

ThreadMapper shows what your Thread smart home says about itself. Most Thread devices are invisible. They just work, until they don't, and there's no way to tell which one dropped, which border routers you really have, or whether a quiet sensor is asleep or gone. WHAT YOU GET • Network health at a glance: an A–F grade with a clear score, and the specific issues pulling it down • Better than yesterday? A line under the grade saying whether today is up or down on yesterday, and which rule moved it • Every battery in one list, emptiest first, with the room • Your Thread devices, apart from the rest: the ones that say they are on Thread, and every other accessory labelled for what it is, behind a bridge or not yet known • Mesh map: your Thread devices by room, and the links they report • Offline alerts that respect quiet: a sleepy sensor gets two hours before it is called offline, and devices that go quiet together are one event • Device history: uptime, reboots and firmware changes • Apple Watch app: your grade on your wrist • Home-screen widget and Live Activity for at-a-glance status HONEST ABOUT ITS DATA ThreadMapper shows only what a device or the network states. A device is Thread when it says so. A border router is one the network proves. A line on the map is a link a device reported. iOS doesn't expose radio signal strength for Thread accessories, so there is no signal figure: a device's page shows how quickly it answered, in milliseconds. The battery level is what each accessory reports about itself. PRIVATE BY DESIGN No account. No analytics. No tracking. Everything stays on your iPhone, and the AI features run on device. Your network data is never uploaded. THREADMAPPER PRO: a one-time purchase, not a subscription • AI Insights on any iPhone, and with Apple Intelligence a Network Assistant and a troubleshooter that reads this device's history, all on device • What the radios say: why a device rebooted, how often it changed parent router, how often a battery device wakes, and how many apps and households can still control it • AR room mapping and X-Ray: scan rooms into a floor plan, place each device where it really is, and see the links your devices report drawn through your real home • Your year on one card, your mesh as a film, and as an A2 poster a print shop will take • A year of daily grades on one calendar, no Apple Intelligence needed, a month of history, weekly reports, and when your home is at its worst • Export every health sample, daily grade and battery reading as CSV or JSON, and import them on a new iPhone • Jobs and evidence sheets: a page for a client showing what a visit changed, and a page per device for a warranty claim • Device groups, multiple homes, scheduled reports and a pinned-devices widget REQUIREMENTS ThreadMapper reads your network through HomeKit, so you'll need a home with at least one Thread border router, such as a HomePod mini or an Apple TV 4K. Border routers are found through Local Network access. The Network Assistant and the troubleshooter need iOS 26 and an Apple Intelligence-capable device; AI Insights works on any iPhone. Room scanning needs a Pro-model iPhone with a LiDAR scanner. Want to look around first? Turn on Demo Mode to explore the whole app with a simulated network, no hardware needed.

Screenshots

Little Grey Book4 screens
ThreadMapper4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Little Grey Book versus ThreadMapper: the parameters behind the verdict, then further details
ParameterLittle Grey BookThreadMapper
PriceFreeFree
Rating4.5 (4 ratings) — better3.7 (3 ratings)
Positive reviews—0.0% of reviews
Number of ratings4 — better3
Update frequencyEvery 3 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPad, Apple Watch — better
Requires iOS17.017.0
Further details — not scored
Size13 MB40 MB
Age rating9+4+
Developerniv ben-porathTintin Razavian

Customer experience

Little Grey Book

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

ThreadMapper

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Little Grey Book

No in-app purchases

2 purchases

ThreadMapper

One-time2
  • PRO Lifetime$7.99
  • FIELD Lifetime$24.99

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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