Arch Calendar vs ThoughtsLeft
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Arch Calendar
This minimal calendar app combines an inbox for tasks and ideas with a planning calendar. Seamlessly capture thoughts and drag them onto time blocks to organize your day and enhance focus.
- Quick task and idea capture
- Drag-and-drop time blocking
- Organize work by Smart Spaces
- Unified inbox and calendar
- Minimalist interface
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TIME BLOCKING PLANNER Arch Calendar is a minimal calendar app that unifies an Inbox (store tasks to handle later) and a Calendar (plan what to do) so you can clear a crowded mind. Capture tasks and ideas the moment they appear, then drag and drop them onto time blocks to take control of your day. By removing the unnecessary and keeping only the essentials, we help you stay immersed without switching tools. CORE FEATURES - Quick Capture: Instantly save sudden tasks, ideas, and the link you’re viewing to the Inbox without breaking your flow. - Calendar Planning: Drag and drop to time-block your day and stay in control. - Smart Spaces: Organize active work by categories to keep clear context. WHY ARCH? The arch stands as one of humanity's most brilliant architectural innovations. Perfected by the Romans, it embodies the essence of true productivity: achieving maximum support with minimal materials. Instead of solid walls, its precisely calculated curvature efficiently distributes weight, creating strength through elegant design. This principle reflects the core of productivity: achieving the greatest outcomes with the least resources. By removing unnecessary elements and retaining only what's essential, the arch delivers both structural integrity and beauty, the physical embodiment of the "Less but Better" philosophy. Inspired by the arch, we've consolidated only the most essential features, scheduling, task management, and idea capture, into one streamlined interface. We focus not on elaborate features but on essential functionality that maximizes productivity. WHY CALENDAR-CENTRIC? For most of us, the day starts with checking our calendar. Whether it's the first screen we touch in the morning or what we glance at between meetings, we constantly consult our schedules. Integrating tasks and ideas directly into this frequently used tool isn't just convenient, it's a fundamental improvement to digital workflow. Recognizing this behavioral pattern, we've placed the calendar at Arch Calendar's core, organically incorporating to-do lists and idea management. No need to open additional apps. You can manage tasks and ideas seamlessly at the very moment you check your schedule, maintaining workflow continuity and contextual awareness. MINIMALISM We now stand beneath a relentless waterfall of information. Minimalism serves as a lighthouse in this storm, advocating for "more meaningful" rather than simply "more." By stripping away noise, clarity emerges. Decisions become confident and actions purposeful. Minimalism isn't just aesthetic, it's psychological survival in the digital age. Arch Calendar embodies this approach: every pixel and interaction serves a clear purpose, protecting your focus and creating mental space. Minimalism is intensely practical. It boosts productivity by reducing cognitive load and improving both the speed and quality of decision-making. Arch Calendar minimizes unnecessary choices, alleviating decision fatigue. Its clean interface reduces learning curves, empowering users to quickly engage with what matters. QUESTIONS? Contact us on email hello@archcalendar.com Privacy Policy: https://www.archcalendar.com/ko/privacy Terms of Service: https://www.archcalendar.com/ko/terms-of-service Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
ThoughtsLeft
Capture your fleeting thoughts, ideas, and worries quickly through typing or voice. Organize them into tasks or notes, or simply let them go. Gain insights into your thinking patterns and maintain mental clarity.
- Instant thought capture (type or voice)
- Organize thoughts with swipe gestures
- Spoken Thought for hands-free capture
- Time-based task manager
- Notes repository
- Activity insights
- Optional Pro upgrade for advanced features
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ThoughtsLeft is a brain dump app for people who think too much: late-night spirals, half-finished ideas, worries you can't shake, things you're scared to forget. Get them all out fast, before the mental clutter takes over. Capture however it comes to you. Type it, or speak it out loud as a Spoken Thought. No structure required, no "right way" to do it. Just thought capture, fast. Then decide on your own time. Organize thoughts into a task, note or simply let them go completely with one swipe, because not every worry needs to become something. KEY FEATURES: • Instant thought capture for ideas, worries, and reminders • Capture from anywhere with the Action Button, Siri, or a Home Screen long-press • Swipe gestures to organize thoughts into tasks or notes • Spoken Thought for hands-free, voice-based capture • Batch processing sessions for inbox zero • Time-based task manager (Today, Tomorrow, This Week, Someday) • Notes repository for everything you want to keep • Activity insights into your thinking patterns • App lock with Face ID, or Touch ID • Dark and light themes • 100% private by default, all thoughts stay on your device (optional iCloud sync available) • Export all your thoughts or delete them anytime OPTIONAL PRO UPGRADE ThoughtsLeft works fully without upgrading. For deeper reflection, focus, and mental clarity, an optional PRO upgrade is available. Thought Timeline & History • View your complete thought history • See how thoughts become tasks, notes, or released items • Reflect on your thinking patterns over time Pattern Insights • Discover when your mind is loudest • Understand your overthinking habits Custom Scheduling • Set exact dates and times for tasks and get notified • Plan with more clarity and precision iCloud Sync • Keep your thoughts backed up and synced with iCloud • Your thoughts stay private, sync is always optional Apple Calendar Sync • Automatically sync your Thoughts Left tasks to your Apple Calendar • View your to-dos right alongside your daily events Premium Themes • Unlock 5 calming, nature-inspired themes • Personalise your space for reflection and focus Available as a one-time purchase or an annual subscription. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Arch Calendar at 77% against ThoughtsLeft's 50%. Arch Calendar also leads on monetization model (free vs free with in-app purchases). On price, update cadence, 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
Both are free to download. Arch Calendar sells 2 in-app purchases, starting at $6.00 per month and ThoughtsLeft sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.
Arch Calendar ships an update every 8 days, ThoughtsLeft every 11 days. The most recent releases landed on September 23, 2026 and September 12, 2026 respectively.
| Parameter | Arch Calendar | ThoughtsLeft |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (2 ratings) — better |
| Positive reviews | 76.9% of reviews — better | 50.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 8 days — better | Every 11 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone |
| Requires iOS | 16.4 | 16.0 — better |
| Further details — not scored | ||
| Size | 95 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | MOBA Incorporated | Jayasrinivasan Varadharajan |
Customer experience
Arch Calendar
ThoughtsLeft
In-app purchases
Arch Calendar
- Monthly Plan$6.001 Month
- Yearly Plan$48.001 Year
ThoughtsLeft
- Thoughts Left PRO7 Days trial$9.991 Year
- Thoughts Left Pro$24.99









