Comparison

Stud Finder App vs Karui Notifications

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

Head to head
About

Stud Finder App

This utility app uses your phone's magnetometer to detect metal objects like nails, screws, pipes, and rebar hidden within walls. It offers two scanning modes and provides real-time feedback to help you avoid drilling into unwanted materials.

Highlights
  • Magnetometer-based metal detection
  • Two distinct scan modes (Stud & Metal)
  • One-tap calibration
  • Live signal gauge with haptic feedback
  • Save and revisit scans
  • Light and dark themes
  • Deep Scan Pro feature
Features
Read full description

Before you drill, know what's behind the wall. Stud Finder uses your phone's built-in magnetometer to detect metal hidden in your walls — the nails and screws that mark a stud's edge, and the pipes, rebar and conduit you want to avoid hitting. Calibrate against a clean section of wall, then sweep slowly. The live gauge rises as you approach a target and calls a hit when the signal is strong enough. TWO SCAN MODES Stud Mode — Tuned for the faint, brief signals produced by the nails and screws fastening a stud to the wall. Trace the fastener line to locate the stud edge. Metal Mode — Tuned for the strong, sustained fields of pipes, rebar, conduit and steel studs. The threshold sits high enough that a nail line won't trigger it, so you can tell a fastener from a pipe. Both modes are free. No paywall on the core detector. FEATURES • One-tap calibration against your actual wall, so readings adapt to the room • Live signal gauge with real-time strength readout in microtesla • Haptic feedback the moment a hit is detected • Save scans with a label like "Living room wall" and revisit them anytime • Keep-screen-awake option so the display won't sleep mid-sweep • Optional reminder if you haven't scanned in a while • Light and dark themes STUD FINDER PRO • Deep Scan — boosted sensitivity that surfaces faint fastener lines a standard scan can miss • Unlimited saved scans (the free version keeps your 5 most recent) HOW IT WORKS — AND WHAT IT CAN'T DO We think you should know exactly what you're buying. Your phone's magnetometer senses magnetic fields. That means it detects ferrous metal — steel nails, screws, pipes, rebar and conduit. Wood is not magnetic, so no phone can detect wood directly. Stud Finder locates studs the same way a magnetic stud finder does: by finding the metal fasteners holding them in place. This is why we describe what we find by signal strength rather than claiming to identify materials. If a reading in Stud Mode is unusually strong, the app tells you it's likely metal rather than a stud. Results depend on your device's magnetometer, wall material and depth. Detection is less reliable through thick plaster, tile, concrete or metal lath. Always verify before drilling, and never rely on any app alone when electrical wiring or plumbing may be present. PRIVACY Stud Finder is designed with your privacy in mind and does not share personal data unnecessarily. Your scans are stored on your device. Privacy Policy: https://redizeuz.com/privacy Terms of Service: https://redizeuz.com/terms

About

Karui Notifications

This app provides a unified notification history for all your applications, allowing you to view deleted messages and filter out spam. It offers VIP contact prioritization, emergency alarms, and auto-replies for specific situations. The app processes notifications privately on your device, ensuring your data remains secure.

Highlights
  • View unsent messages
  • Unified notification history
  • VIP contact prioritization
  • Emergency alarm feature
  • Spam and promotion filtering
  • Auto-reply functionality
  • Notification translation
Read full description

Read unsent messages: when someone takes a message back, it’s still in Karui. Takes about a minute to set up. Every app’s notifications in one searchable history. Your VIP contacts always get through your Focus, from any app. Wake Me: people you choose can ring an alarm in an emergency, even when your iPhone is silenced. Spam and promotions are silenced, judged by the actual message, not the app. One-time codes are never silenced. Several quick messages from one person arrive as one notification. Auto Reply: tells your VIPs you’re driving, in a meeting, or asleep, and that you’ll reply later. Automatically translate notifications into your language. Deadline reminders: when a notification asks for something by a certain day, Karui reminds you the day before. How it works: Karui evaluates notifications privately on your iPhone, using your important contacts and calendar info, and decides whether to show them or hide them. Setup: you add the Karui Shortcut from a link, which takes about a minute and is all you need to read unsent messages. To filter spam, you also choose a Focus that keeps your other apps quiet. Karui guides you through both. Spam filtering and deadline reminders require Apple Intelligence to be supported and turned on. Viewing unsent messages works without it. Privacy: Karui runs privately on your iPhone with Apple Intelligence, using Apple’s on-device model, so your notifications stay on your device. The optional Second Opinion feature, off by default, sends a notification’s text to Apple’s Private Cloud Compute when you turn it on. Karui has no server, does not require an account, and sends zero analytics.

Screenshots

Stud Finder App4 screens
Karui Notifications3 screens

Verdict

The call

The clearest difference is rating: Karui Notifications at 5.0 against Stud Finder App's 4.3. Karui Notifications also leads on in-app purchases (none vs 2) and ads (none vs shown). Stud Finder App's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 27.0). On price and ratings volume 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. Stud Finder App sells 2 in-app purchases, starting at $9.99 per year. Karui Notifications asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Karui Notifications holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 4 and 3 respectively.

Scorecard6 real differences · 4 level
Stud Finder App versus Karui Notifications: the parameters behind the verdict, then further details
ParameterStud Finder AppKarui Notifications
PriceFreeFree
Rating4.3 (4 ratings)5.0 (3 ratings) — better
Positive reviews80.0% of reviews—
Number of ratings4 — better3
Update frequency—Daily
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better27.0
Further details — not scored
Size53 MB16 MB
Age rating4+4+
DeveloperEbenezer OtengJustin Henry Garcia

Customer experience

Stud Finder App

All ratings4 ratings
Positive75.0%
Neutral25.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral20.0%
Negative0.0%

Karui Notifications

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Stud Finder App

Subscriptions1
  • Yearly$9.991 Year
One-time1
  • Lifetime$7.99
None

Karui Notifications

No in-app purchases

Questions

Is Stud Finder App free?
Stud Finder App is free to download, with in-app purchases available.
Is Karui Notifications free?
Karui Notifications is free to download, with no in-app purchases.
Which has better reviews, Stud Finder App or Karui Notifications?
Karui Notifications is rated higher. Stud Finder App averages 4.3 out of 5 from 4 ratings, while Karui Notifications averages 5.0 from 3 ratings.
Do Stud Finder App or Karui Notifications have ads?
Stud Finder App shows ads; Karui Notifications does not.

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