Comparison

Stack Productivity vs Fleeting Thoughts

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

Head to head
About

Stack Productivity

Features
Read full description

Stack is a modern thought organizer designed to help you capture ideas the moment they strike — and bring order to the chaos later. It’s more than notes or to-dos. It’s the first step to shaping your reality. A tool for taking thoughts from the immaterial world and placing it into the physical one. - Jot things down, instantly Whether it’s a reminder, principles, reflections, tasks, ideas, or random thoughts — drop a thread of thought into stack. Add just a title or expand with detail when you're ready. - Sort your mind, your way Group your Threads into Stacks (like notebooks), and break those into Branches (like sections or topics). Add Labels and colours to organise how you think, not how software wants you to. - Designed for clarity With a clean, intuitive interface and thoughtful visual design, Stack helps you focus on what matters. No clutter. No pressure. Just space to think clearly and act intentionally. - Real use, real life Use Stack to: Plan life Track personal projects and creative ideas Keep a journal of thoughts and reflections Break down goals or routines Collect inspirations, quotes, or daily reminders Whether you're meal-planning or mind-mapping, Stack adapts to your life. - Make it yours Choose from light and dark themes (More coming soon). Pick fonts that suit your vibe. It’s your mental workspace. - What’s coming soon We’re building AI features to help break down your bigger thoughts into smaller actions, detect urgency, and help you stay on track — all without taking control away from you. We're designing and developing more tools to help you process and shape reality, we'll Stack them on when the time comes!

About

Fleeting Thoughts

Capture thoughts privately with voice, text, scans, videos, and files in a unified timeline. Your data stays on your device or chosen cloud storage, with no accounts or tracking. Edit, tag, and export your notes easily.

Highlights
  • Unified timeline for voice, text, scans, video, and files
  • On-device transcription and Apple Intelligence cleanup
  • Private data storage (device, iCloud, or Files app)
  • Video trimming, reframing, and image cropping
  • Document scanning with text extraction
  • Tagging and filtering for organization
  • Markdown or JSON export options
Features
Read full description

Fleeting Thoughts is a private capture pipeline for the agentic era. Save ideas, notes, links, screenshots, scans, PDFs and voice thoughts the moment they appear, as plain files you control, ready for the notes apps, workflows and AI agents you choose. Use it when you want a fast private place to save something now and organize it later. Start with a quick voice note, paste text, share in a link, scan a page, import a file, or capture from Apple Watch. Everything lands in one clean timeline you control. - YOUR DATA, YOUR CHOICE Every thought is saved as a plain, readable file, on your iPhone or in a folder you choose. Use those files with your notes app, your own database, your local agents or the AI assistant you prefer, or keep them just for yourself. Nothing requires an agent or a subscription, and your data stays yours whatever you use next. - CAPTURE FAST Tap the mic to record, type a note, paste from the clipboard, scan a page, import a photo or file, or share content into Fleeting Thoughts from other apps. - BUILT FOR THE MOMENT The app is designed for quick capture first. Save the thought, hear the confirmation, and move on. You can clean it up later. - TAGS THAT STAY SIMPLE Use lightweight tags to keep ideas, links, health notes, project thoughts, and other captures separated without turning capture into a filing task. - MEDIA THAT STAYS USEFUL Keep original images, scans, screenshots, videos, audio, and PDFs attached to the thought that created them. Preview, copy, share, export, trim, crop, or remove extra attachments when needed. - PDF READER COMPANION Open saved PDFs in a focused reader, resume where you left off, bookmark a page, save a page as an image, clip selected text, and add page notes back into the original thought. - APPLE WATCH CAPTURE Capture from your wrist when your phone is not in your hand. Watch recordings keep going while you use other apps, then arrive in your iPhone timeline, transcribed. - SEARCH AND EXPORT Search your timeline, copy individual thoughts, export selected groups, and use iPhone Spotlight to find saved thoughts from outside the app. - LOCAL-FIRST BY DEFAULT No account required. No tracking. Your captures stay private and local unless you choose to share or export them. You can also choose a folder for readable saved files. - ONE PURCHASE, EVERY PLATFORM Universal Purchase includes iPhone, Apple Watch, and Mac. Each app is designed for its own device: iPhone for capture on the go, Apple Watch for wrist capture, and Mac for desktop dictation. Fleeting Thoughts is for people who think faster than they can organize: builders, writers, researchers, students, and anyone who needs to save useful things before they disappear.

Screenshots

Stack Productivity4 screens
Fleeting Thoughts4 screens

Verdict

The call

The clearest difference is price: Stack Productivity at Free against Fleeting Thoughts's $9.99. Stack Productivity also leads on iOS requirement (12.0 vs 26.0). On ads, in-app purchases and device support 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

Stack Productivity is free to download; Fleeting Thoughts costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scorecard2 real differences · 8 level
Stack Productivity versus Fleeting Thoughts: the parameters behind the verdict, then further details
ParameterStack ProductivityFleeting Thoughts
PriceFree — better$9.99
Rating—5.0 (5 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—5 — better
Update frequency—Every 5 days
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPodiPhone, iPad, Mac, Apple Watch — better
Requires iOS12.0 — better26.0
Further details — not scored
Size74 MB12 MB
Age rating4+4+
DeveloperIan RanasingheDylan Russell

In-app purchases

None

Stack Productivity

No in-app purchases

None

Fleeting Thoughts

No in-app purchases

Questions

Is Stack Productivity free?
Stack Productivity is free to download, with no in-app purchases.
Is Fleeting Thoughts free?
Fleeting Thoughts costs $9.99, with no in-app purchases.
Do Stack Productivity or Fleeting Thoughts have ads?
Neither Stack Productivity nor Fleeting Thoughts shows ads.

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