Comparison

IsTalk vs Posti

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

Head to head
About

IsTalk

Analyze your LINE chat history to understand your communication patterns and compatibility with others. Discover insights into your conversations, including frequently used phrases, chat times, and relationship dynamics, all processed securely offline.

Highlights
  • LINE chat analysis
  • Compatibility diagnosis
  • Offline processing
  • AI relationship mapping
  • Habit and behavior insights
  • Time-series trend analysis
  • Group chat analysis
Read full description

*:。・*。*:。・*。・*:。・*。*・*。*。*。* Thanks to you, over 1,000,000 downloads! *:。・*。*:。・*。・*:。・*。*・*。*。*。* This is the No. 1 LINE compatibility diagnosis/talk analysis app that everyone is using! This app lets you thoroughly analyze LINE chat content without the other person knowing! You can even find out your compatibility from your LINE exchanges! You might discover facts you never knew! *To ensure safe and secure use of the app, chat content is analyzed within the app terminal without going through the internet. For example...  Number of chats (number of times you chatted with each other)  Number of stamps (number of stamps sent and received)  Number of calls (number of calls made to each other)  Number of times you said "sorry" (number of times you apologized to each other)  Phrases that you frequently use with each other  The time of day you most often communicate  The day of the week you most often communicate  Whether the number of chats in the last month is higher or lower than the overall average ...and much more! You can accurately find out various information about your exchanges! [Features of IsTalk] ・Thoroughly analyze your and your partner's LINE chats, learn about your compatibility, and aggregate and display information about your LINE exchanges in an easy-to-understand manner. ・All analysis processing is done offline (without communication with a server), so you can use it safely and securely. ・The analysis results diagnose your compatibility with the person you analyzed. Check out your LINE compatibility with that special someone. ・On the analysis results screen, AI can perform even more detailed compatibility analysis (*Network connection is required to use this function. Please do not use if there are exchanges that contain confidential information, secret information, or personal information.) ・AI "Relationship Mapping" visualizes your relationship on a graph for a smart overview of compatibility. ・Habit screen: see frequently used phrases, peak chat times, and reply speed trends. ・Behavior screen: view chat counts, stamp counts, greetings, apologies, and more. ・Record screen: time-series chat trends, reply time changes, daily averages, and monthly summaries. ・Overall compatibility assessment tracks changes over time with graphed compatibility scores. *Premium only ・Premium service unlocks ad removal and additional features. See "About Premium Services" in FAQ. ・Customize analysis icons from settings. *Some icons are premium only. ・Rankings show TOP 3 compatibility matches and most-chatted partners. ・Group LINE analysis supports aggregation only (no compatibility). Swipe HOME screen to switch views. *If you cannot analyze, check "What if you cannot analyze?" in settings. *This app does not use LINE's API. All analysis uses our own unique algorithm. *We welcome your opinions and requests.

About

Posti

Features
Read full description

Please Note: Posti is optimized for package tracking within South Korea. For the best experience, we recommend using this app for shipments within South Korea. Stop searching portal websites or repeatedly opening carrier apps just to see where your package is. Posti is an intelligent delivery tracking app that keeps you informed from dispatch to completion via push notifications, the Dynamic Island, and Lock Screen Live Activities—all with a single tracking number entry. Key Features - Dynamic Island & Live Activities: When a delivery is out for same-day arrival, monitor its progress seamlessly via the Dynamic Island and Live Activities. All prior transit steps are delivered via push notifications. - Intuitive 5-Stage Gauge: Instantly understand your shipment flow at a glance with a visual progress bar (Preparing, In Transit, Out for Delivery, and Delivered). - Custom Category Icons: Assign distinct icons tailored to your package (fashion, electronics, food, etc.) to organize multiple deliveries intuitively. - Instant Tracking Without Sign-in: No sign-ups or personal identity verifications required. Start tracking immediately by simply entering the tracking number. - Timeline Tracking History: Tap the in-app widget to view a clean, chronological timeline of terminal check-ins, check-outs, and transit hub updates. Supported Carriers - Major Domestic Carriers (Korea): CJ Logistics (CJ대한통운), Korea Post (우체국택배), Coupang (쿠팡), Hanjin Express (한진택배), Lotte Global Logistics (롯데택배), Logen (로젠택배), Kyungdong Express (경동택배), Daesin Express (대신택배), Hapdong Express (합동택배), Chunil Express (천일택배), Kunyoung Express (건영택배), Yongma Logis (용마로지스), Ilyang Logis (일양로지스), SLX, GS25 CVSnet, CU Post, Homepick, Hanseo Honam Express, Hanips (HPL), GoodstoLuck, Today Pickup, Today, Delibox, LTL - International Express & Cross-border: LX Pantos, SWG Express, CWAY, ACT & Core Logistics, Korea Post EMS, DHL, FedEx, UPS, Cainiao Global, USPS, TNT, Japan Post, Sagawa, Yamato, Yuubin (Supported couriers are subject to change.) Usage Guide & Posti Pro Subscription - First 10 Free Deliveries: All users can register up to 10 deliveries and experience real-time widgets and notification features completely free of charge without any payment. (As the free version offers the exact same features, we recommend trying out the free trial first before subscribing.) - Posti Pro Subscription: Starting from your 11th delivery, enjoy unlimited tracking with no count restrictions through an auto-renewing subscription of KRW 1,100 / month (or local currency equivalent). In-App Purchases & Auto-Renewal Details - Payment will be charged to your Apple ID account at confirmation of purchase. - Subscriptions automatically renew monthly at the same price unless canceled at least 24 hours before the end of the current billing cycle. - You can manage or cancel your subscription at any time by going to your iOS device's [Settings] > [Apple ID Account] > [Subscriptions]. - When changing devices or reinstalling the app, you can restore your existing active subscription free of charge via "Restore Purchases" in the app. [Terms of Use & Privacy Policy] • Terms of Use(EULA): https://habitual-tendency-6a4.notion.site/Posti-3c4cb86ed83b80f4a029c0df7260cbd5?source=copy_link • Privacy Policy: https://habitual-tendency-6a4.notion.site/Posti-3c4cb86ed83b8034a817f96dbd1e9609?source=copy_link

Screenshots

IsTalk4 screens
Posti4 screens

Verdict

The call

The clearest difference is ads: Posti at none against IsTalk's shown. IsTalk's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.6). On price 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. IsTalk sells 9 in-app purchases, starting at $1.99 per 7 days and Posti sells 1 in-app purchase, starting at $0.49 per month. Whichever you choose, the download price is not the number that matters.

Scorecard3 real differences · 7 level
IsTalk versus Posti: the parameters behind the verdict, then further details
ParameterIsTalkPosti
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews49.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 3 days—
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better18.6
Further details — not scored
Size147 MB2 MB
Age rating4+4+
DeveloperREALBIND .incSeongHak Song

Bugs and requests

IsTalk

Reported bugs

15 issues
  • AI accuracy issues (message sender identification)
  • Incorrect call counts
  • Incorrect message counts (e.g., 'w' count)
  • Incorrect 'love word' classification
  • App crashes when analyzing large files
Show 10 more
  • App crashes after ad display
  • Analysis fails with 'unexpected error'
  • LINE integration not responding
  • Data loss after app updates
  • Analysis function not working (returns to results screen)
  • Inability to analyze due to 'insufficient data' despite large chat history
  • Total call time calculation errors
  • Analysis results not updating after calls
  • App crashes when sending files from LINE
  • App crashes when opening LINE from the app

Requested features

10 requests
  • Enable Instagram DM analysis
  • Allow viewing all past LINE messages
  • Improve accuracy of message/call counts
  • Expand analysis period
  • Add dark mode
Show 5 more
  • Improve free point accumulation methods
  • Restore previous analysis data
  • Enable analysis for larger chat volumes
  • Make 'love words' visible for free
  • Add support for more platforms like Instagram

Posti

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

IsTalk

Subscriptions3
  • Premium Plan Weekly$1.997 Days
  • Premium Plan Monthly$2.991 Month
  • Premium Plan Annual3 Days trial$22.991 Year
One-time6
  • 広告の非表示+追加コンテンツ開放Free
  • S- Ticket(10 set)$1.99
  • S- Ticket(20 set)$2.99
Show 3 more
  • S- Ticket(30 set)$3.99
  • S- Ticket(50 set)$6.99
  • S- Ticket(100 set)$11.99
1 purchases

Posti

Subscriptions1
  • Posti Pro$0.491 Month

Questions

Is IsTalk free?
IsTalk is free to download, with in-app purchases available.
Is Posti free?
Posti is free to download, with in-app purchases available.
Do IsTalk or Posti have ads?
IsTalk shows ads; Posti does not.

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