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 unifies tasks and scheduling into a single interface. Capture ideas instantly and drag them onto time blocks to organize your day. It focuses on essential functionality to help you stay focused and productive.
- Quick task and idea capture
- Drag-and-drop time blocking
- Organize work by categories
- Streamlined interface
- Minimalist design
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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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Thoughts Left is a brain dump app for people who think too much: late-night spirals, half-finished ideas, things you keep checking, 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, speak it as a Spoken Thought, or snap it. No structure required, no "right way" to do it. Then decide on your own time. Turn thoughts into a task or a note, or simply let them go with one swipe, because not every thought needs to become something. NEW IN 2.0: SNAP DUMP Did you lock the door? Turn off the stove? Where did you park? Snap a photo once and stop wondering. Snaps clear themselves after 24 hours and never leave your phone. KEY FEATURES: • Instant capture for ideas, worries, and reminders • Snap Dump: photo capture that clears itself in 24 hours • Home Screen and Lock Screen widgets for quick capture • Long-press the app icon to jump straight to Snap Dump or a new thought • Capture from anywhere with the Action Button or Siri • Spoken Thought for hands-free, voice-based capture • Swipe gestures to turn thoughts into tasks or notes • Just let go mode: hide Tasks and Notes for a simpler app • Batch processing sessions for inbox zero • Time-based task manager (Today, Tomorrow, This Week, Someday) • Notes for everything you want to keep • Activity insights into your thinking patterns • App Lock with Face ID or Touch ID • Dark and light themes • Private by design: no account, and your thoughts and snaps stay on your device (optional iCloud sync) • Export all your thoughts or delete them anytime OPTIONAL PRO UPGRADE Thoughts Left works fully without upgrading. For deeper reflection, focus, and mental clarity, an optional PRO upgrade is available. Keep Snaps Longer • Keep a snap for 3, 7 or 30 days, or forever 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 79% against ThoughtsLeft's 50%. 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 $19.99 per year. Whichever you choose, the download price is not the number that matters.
Arch Calendar ships an update every 9 days, ThoughtsLeft every 2 weeks. The most recent releases landed on November 11, 2026 and October 30, 2026 respectively.
| Parameter | Arch Calendar | ThoughtsLeft |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (2 ratings) — better |
| Positive reviews | 78.6% of reviews — better | 50.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 9 days — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.4 | 16.0 — better |
| Further details — not scored | ||
| Size | 126 MB | 49 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$19.991 Year
- Thoughts Left Pro$39.99









