IDZ vs Kaizen
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IDZ
This app offers a secure, private workspace for AI interactions, encrypted file storage, and secure messaging. It allows users to ask questions across their files and chats, find exact sources, and turn answers into actionable items, all while maintaining control over their data.
- Private AI for files and chats
- Encrypted cloud storage
- Secure private and group messaging
- Find exact sources of information
- Summarize, compare, and redact data
- Share results into chat or cloud storage
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Meet MetaCortex in IDZ – private AI across your files and chats. Ask across your encrypted workspace, find the exact source, turn answers into actions, and keep full control of what happens next. With MetaCortex, ZCloud, and ZChat in one app, IDZ gives you a secure workspace for private AI, encrypted storage, and private messaging. With MetaCortex, you can: - Ask across files and chats in one place - Find the exact source in files, pages, and messages - Summarize, compare, redact, and extract what matters - Save outputs as reusable artifacts - Share results into ZChat or keep them in ZCloud - Review a signed receipt for every result Private where supported. Boost with consent. Private mode is available on capable desktop devices. On mobile, web, and unsupported devices, MetaCortex uses Boost with consent. Only the sanitized data approved for that request is sent. With ZCloud, you can: - Store files in encrypted cloud storage - Upload, organize, and access your files across devices - Share with passwords, expiry, and view-only controls - Keep your workspace secure and private With ZChat, you can: - Send encrypted private and group messages - Stay connected across devices - Share files and outputs directly in chat - Keep conversations private inside the same secure workspace Why IDZ - One secure workspace for files, chats, and AI - Zero-knowledge storage - No tracking - No ads Choose IDZ if you want private AI, encrypted storage, and secure chat in one app.
Kaizen
This app combines a Kanban board, calendar, and AI assistant to help you organize your tasks and improve continuously. It offers voice commands and customizable aesthetics to create a focused and functional workspace.
- Kanban board for project management
- Integrated calendar view
- AI assistant with voice commands
- Drafts calendar events and creates tasks
- Material 3 theming and custom backgrounds
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End your day feeling done — not buried. 88% of people go to bed feeling unaccomplished. Not because they didn't work hard, but because their tools fight them: a to-do list in one app, a calendar in another, a Kanban board in a third, and an AI chat in a fourth. Nothing talks to anything. Kaizen brings it all into one app that you actually want to open. → TIME-BLOCK YOUR DAY, NOT JUST LIST IT Drag tasks straight onto your calendar. See your real day — to-dos AND time blocks — side by side on a split screen (iPad/large screens). No more "I have 17 to-dos and 6 hours, what now?" — Kaizen shows you when, not just what. → AI THAT ACTUALLY KNOWS YOU You can use Kaizen's build in AI assistant or work with frontier models through MCP. Set persistent instructions ("Be blunt", "Push me on my side project", "Cut me slack on Fridays") and the AI shapes itself around you instead of you adapting to it. Brain-dump out loud, get a structured plan back. → KANBAN WHEN A LIST ISN'T ENOUGH Every project gets a board view. Drag tasks through Backlog → Doing → Done. Perfect for side projects, course work, and creative work where a flat list doesn't fit. → LIFE TIERLIST: SEE WHAT ACTUALLY MATTERS Hidden behind a long-press on the calendar icon: rank the areas of your life — Career, Health, Family, Learning, Side Project, ... — into a visual hierarchy. When you don't know what to work on, your tierlist answers for you. No other planner does this. → MAKE IT YOURS — REALLY YOURS Backgrounds per page. Custom fonts, sizes, icons. Opacity and blur per element. Custom colors. Windowed mode on larger devices. Most planners give you "dark mode and three theme colors." Kaizen gives you a workspace that feels like it was built for your brain. WHO IT'S FOR • Employees juggling work, life and a side project • Founders and freelancers who can't afford a messy day • Students whose calendar and homework live in different worlds • Anyone who's tried five planners and bounced off all of them WHAT YOU GET WITH UNLIMITED - Unlimited tasks, folders, and task lists - Calendar with day, week, month views - Drag-and-drop time blocking - Kanban board per project - Habit-style recurring tasks and reminders - iOS, Android, and Web — synced - Life Tierlist - Deep customization (backgrounds, opacity, blur, custom fonts) - Import/export your data anytime AI UNLOCKS - Kaizen AI with persistent instructions + MCP for Claude/ChatGPT - Speech task creation WHY "KAIZEN" Kaizen (改善) is the Japanese practice of getting 1% better, every day. Not a productivity hack. A way of building a life that compounds. START TODAY Spend 60 seconds importing your existing tasks. Block tomorrow morning. Notice the difference by Friday. Have an idea? Tap "Suggest a feature" in settings — we read every one.
Screenshots
Verdict
The clearest difference is rating: IDZ at 3.8 against Kaizen's 1.5. Kaizen's advantage is update cadence (every 2 weeks vs every 5 weeks). On price, review sentiment, ratings volume and ads 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
Both are free to download. IDZ sells 2 in-app purchases, starting at $14.99 per month and Kaizen sells 7 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
IDZ holds the better App Store score, 3.8 against 1.5. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews split almost evenly too, at 0% and 0% positive.
IDZ ships an update every 5 weeks, Kaizen every 2 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | IDZ | Kaizen |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (5 ratings) — better | 1.5 (2 ratings) |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | 5 — better | 2 |
| Update frequency | Every 5 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 16.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 97 MB | 132 MB |
| Age rating | 4+ | 4+ |
| Developer | IDZ LTD | Lennard Zieten |
Customer experience
IDZ
Kaizen
In-app purchases
IDZ
- PRO$14.991 Month
- PRO1 Year trial$149.001 Year
Kaizen
- Kaizen Pro - Monthly$3.991 Month
- Kaizen Unlimited14 Days trial$9.991 Month
- Kaizen AI14 Days trial$14.991 Month
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- Kaizen Pro - Annual$39.991 Year
- Kaizen Unlimited14 Days trial$47.901 Year
- Kaizen AI14 Days trial$69.901 Year
- Kaizen Pro - Lifetime$179.00









