Comparison

Quartrix vs Islet

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

Head to head
About

Quartrix

Features
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Every small choice adds up to a balanced life. Find your perfect equilibrium with Quartrix. Simple and Intuitive Task Management # Keep all your tasks in one place - Easily classify by importance and urgency - Get guidance from a friendly classification wizard - See your work/play/relationship/health balance at a glance # Find Your Personal Balance - Track energy levels and engagement for completed tasks - Discover your patterns through data - Find your sustainable balance point - Experience growth without burnout # Perfect For - Freelancers juggling multiple roles - Professionals seeking work-life harmony - Students balancing studies and personal life - Anyone feeling overwhelmed or anxious - Those wanting to reclaim control of their time # Convenient Features - Seamless calendar integration for unified scheduling - Focus mode to secure deep work time

About

Islet

Features
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The problem with to-do apps? You have to open them. Islet keeps today's tasks on your Dynamic Island and Lock Screen. One task always stays on screen, done with a single tap. How it works - Tap "Start Session" to pin today's tasks to the island - Long-press the island to browse and complete right there - view and action in one place, even when the app is closed - On the Lock Screen, a larger card with one-handed button layout - Overdue tasks are marked orange and shown first - Jot memos straight from the island - Lock Screen widgets and controls to start a session or add a task in one tap Store it your way - On-device by default - no sign-up, no account - Use Notion? Connect it (Islet Pro): two-way sync with your task database - Multiple databases for chores, work, study (Islet Pro) - Export to Markdown/JSON anytime Built to trust - Offline-safe - completions and memos never get lost; they sync when you're back online - We don't store your data on our servers. Everything stays on your device and in your Notion. Note: A Live Activity lasts up to 8 hours per session (an iOS limit); you'll be notified before it ends. Notion is a trademark of Notion Labs, Inc. This app is independent and not affiliated with or endorsed by Notion Labs, Inc.

Screenshots

Quartrix4 screens
Islet4 screens

Verdict

The call

The clearest difference is in-app purchases: Quartrix at none against Islet's 1. Islet's advantage is update cadence (every 3 days vs weekly). On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Islet sells 1 one-off in-app purchase. Quartrix asks for nothing beyond the download.

UpkeepUpdate frequency

Quartrix ships an update weekly, Islet every 3 days. The most recent releases landed on September 14, 2026 and September 11, 2026 respectively.

Scorecard2 real differences ยท 4 level
Quartrix versus Islet: the parameters behind the verdict, then further details
ParameterQuartrixIslet
PriceFreeFree
Update frequencyWeeklyEvery 3 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad โ€” betteriPhone
Requires iOS17.517.0 โ€” better
Further details โ€” not scored
Size1 MB3 MB
Age rating4+4+
DeveloperOOMOOL CREATIVEHyunWoo Lee

In-app purchases

None

Quartrix

No in-app purchases

1 purchases

Islet

One-time1
  • Islet Pro$2.99

Questions

Is Quartrix free?
Quartrix is free to download, with no in-app purchases.
Is Islet free?
Islet is free to download, with in-app purchases available.
Do Quartrix or Islet have ads?
Neither Quartrix nor Islet shows ads.
Which is updated more often, Quartrix or Islet?
Quartrix ships an update weekly, and Islet every 3 days. Most recently, Quartrix was updated on September 14, 2026 and Islet on September 11, 2026.

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