Comparison

Blue Post Cross 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

Blue Post Cross

Seamlessly share notifications between your iPhone and an Android device. Read alerts from your other phone on your iPhone without needing to retrieve it. You can also send notifications from your iPhone to your Android companion.

Highlights
  • Share notifications between devices
  • View dismissed notifications
  • Send notifications from iPhone to Android
  • Battery level indicator
  • Last connected location tracking
  • Bluetooth direct connection
Features
Read full description

Blue Post brings the notifications from your other phone to your iPhone. If you carry two phones, the notifications keep arriving on the one that is in your bag. Blue Post lets you read them on the iPhone in your hand, without taking the other phone out. ■ What this app does • Shows the notifications that arrive on your other phone here on your iPhone. They are kept in a list, so you can read them again after you dismiss them. • Sends the notifications that arrive on this iPhone to your other phone, so you can leave this iPhone in your bag instead. • Each direction has its own switch. You can use just one of them. • Shows the battery level of your other phone, and tells you when it is running low. • Shows where you were the last time the two phones were connected, so you can tell where you left the other one. That place stays on this iPhone and is never sent anywhere. ■ Connected directly over Bluetooth The two phones talk to each other directly over Bluetooth. Notifications do not travel over the Internet, there is no account to create, and nothing is sent to us or to anyone else. Because it is a Bluetooth link, the connection depends on the distance between the two phones and on the radio conditions around you, and it can drop. ■ What you need • This iPhone, and one other phone to pair it with. • The other phone must be an Android phone with the Blue Post companion app installed. The two apps are one product: neither half does anything on its own. • Bluetooth turned on on both phones. • Two iPhones cannot be paired with each other. ■ Setting up 1. Install Blue Post on both phones. 2. Grant the permissions this app asks for, in the order it asks. 3. Scan the pairing QR code shown on the other phone. 4. Send yourself a test notification and check that it arrives on the other side. ■ Made for • People who carry two phones — one for work and one for private life, or a main phone and a spare. • People who keep the second phone in a bag or a pocket and miss what arrives on it. • People who would rather not pick up both phones every time one of them buzzes.

About

Karui Notifications

This app intelligently sorts your notifications, silencing spam while ensuring important messages and emergency alerts get through. It offers features like reading unsent messages, automatic replies, and deadline reminders, enhancing your focus and communication.

Highlights
  • Intelligent notification sorting
  • Spam silencing
  • Emergency alerts
  • Read unsent messages
  • Auto-reply
  • Deadline reminders
  • Searchable notification history
Features
Read full description

Karui sorts every notification the moment it arrives. Spam stays silent; friends and one-time codes get through. You can even read unsent messages. And emergencies wake you up, even on silent. Already keep notifications off? You might be missing a friend changing plans or an important delivery. Turn them back on: Karui lets those through and keeps promos from the same apps silent. Already using Focus modes? Karui builds on top of Focus. It judges each message, not just the app it came from, lets your VIPs through from any app, not just Apple’s, and adds what Focus can’t do: • Wake Me: people you choose can ring an alarm in an emergency, even when your iPhone is silenced. It depends on the Karui Shortcut running, so don’t rely on it alone. • Auto Reply tells your VIPs you’re driving, in a meeting, or asleep, and that you’ll reply later. • Deadline reminders: when a message asks for something by a certain day, Karui reminds you the day before. • Several quick messages from one person arrive as one notification. • Notifications translated into your language. • Every app’s notifications in one searchable history. On your Mac too Karui for Mac, free at karui.jp/mac, improves filtering, clears alerts on your iPhone that you’ve already dealt with on your Mac, and keeps your iPhone quiet while you’re using your Mac. Setup Add the Karui Shortcut from a link. It 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 need Apple Intelligence; unsent messages work without it. Privacy Karui runs on your iPhone with Apple’s on-device model, so your notifications stay on your device. Private Cloud Sorting, which setup offers, sends a notification’s text to Apple’s Private Cloud Compute when the on-device model can’t sort it. No server, no account, zero analytics.

Screenshots

Blue Post Cross4 screens
Karui Notifications3 screens

Verdict

The call

The clearest difference is update cadence: Karui Notifications at daily against Blue Post Cross's every 9 days. Karui Notifications also leads on ratings volume (4 vs 1). Blue Post Cross's advantage is iOS requirement (17.0 vs 27.0). On price, rating, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Blue Post Cross against 5.0 for Karui Notifications. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

UpkeepUpdate frequency

Blue Post Cross ships an update every 9 days, Karui Notifications daily. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

Scorecard3 real differences · 7 level
Blue Post Cross versus Karui Notifications: the parameters behind the verdict, then further details
ParameterBlue Post CrossKarui Notifications
PriceFreeFree
Rating5.0 (1 ratings)5.0 (4 ratings)
Positive reviews—100.0% of reviews
Number of ratings14 — better
Update frequencyEvery 9 daysDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad — betteriPhone
Requires iOS17.0 — better27.0
Further details — not scored
Size9 MB18 MB
Age rating4+4+
DeveloperToshinori MatsuiJustin Henry Garcia

Customer experience

Blue Post Cross

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Karui Notifications

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Blue Post Cross

No in-app purchases

None

Karui Notifications

No in-app purchases

Questions

Is Blue Post Cross free?
Blue Post Cross is free to download, with no in-app purchases.
Is Karui Notifications free?
Karui Notifications is free to download, with no in-app purchases.
Which has better reviews, Blue Post Cross or Karui Notifications?
Blue Post Cross and Karui Notifications are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.
Do Blue Post Cross or Karui Notifications have ads?
Neither Blue Post Cross nor Karui Notifications shows ads.
Which is updated more often, Blue Post Cross or Karui Notifications?
Blue Post Cross ships an update every 9 days, and Karui Notifications daily. Most recently, Blue Post Cross was updated on October 31, 2026 and Karui Notifications on November 10, 2026.

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