Comparison

Fast Idea Book vs Stack

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

Head to head
About

Fast Idea Book

Quickly capture fleeting thoughts via text, voice, or photo with a single tap. Access your ideas through widgets, the Share Sheet, or Siri. Organize and review them later, with advanced features unlocked via subscription.

Highlights
  • One-tap text, voice, and photo capture
  • Home Screen capture widget
  • Share Sheet integration
  • On-device voice transcription
  • Tags and quick review
  • Siri integration
  • iCloud sync
Features
Read full description

A frictionless capture pad for the ideas you would otherwise lose. If you have ever woken at 3 AM with a great idea and nothing to write it on, or watched a brilliant phrase evaporate while you opened a heavier app, Fast Idea Book is for you. It is a calm, on-device idea book built around one job — capture the thought before it fades — and one principle: never make you wait or sign in. Open the app and you are already typing. Quick notes save with a single keystroke. Brainstorm freely without folder rituals, then tag entries afterward when your brain wants structure. Voice memo capture for hands-free moments, brain-dump templates for foggy mornings, and a search that surfaces the half-remembered note in seconds. Home Screen and Lock Screen widgets keep the latest idea visible, and the interface ships in 39 languages with full accessibility. Built for writers, founders, students, designers and anyone whose best ideas arrive at the worst possible moment.

About

Stack

Features
Read full description

Stack is a project planner built the way a Mac app should be. Lay work out on boards, see the same work on a calendar, and watch it run on a timeline — on iPhone, iPad and Mac, with everything synced privately through your own iCloud. BOARDS THAT MOVE Lists and tasks you can drag anywhere. Colour-coded labels, cover images, checklists, due dates, priorities, attachments and comments. Give a board a key and every task gets a number you can quote — HRB-14. THREE WAYS TO SEE THE SAME WORK Columns when you are running the work. One long list when you are working through it. A month calendar when you need to know what lands when — and a timeline of lanes and bars when you need to see the whole project at once. PLAN ITEMS, NOT JUST TASKS "Design freeze". "Launch". Dates a project has to remember that are nobody's to-do. They sit on the calendar and the timeline beside the work without pretending to be tasks. TODAY, THIS WEEK, FLAGGED Saved views that cut across every board, so you can start the day in one place instead of opening four boards to find out what is due. FIND ANYTHING Full-text search across every board — titles, descriptions, checklists and attachment names — with the board and list each result came from. SHARE A BOARD Invite someone with a link. They see your board, you see their edits, and it all runs on iCloud sharing. No accounts to create, no seats to buy. EVERYWHERE YOU WORK Quick add from anywhere. A menu bar item on Mac. A share extension so anything you are looking at can become a task. A home-screen widget for what is due today. Shortcuts and Siri support for the rest. WORKS OFFLINE, ALWAYS Every read and every write happens on your device first. Sync catches up when the network does. A plane, a basement, a bad hotel — the app does not care. PRIVATE BY DESIGN No account. No server. No tracking. No ads. Your boards live on your device and sync through your personal iCloud — nobody else can see them, including us. Free, with no subscription and nothing to unlock. Built natively for iPhone, iPad and Mac, localized into six languages, and designed to feel at home on every screen size.

Screenshots

Fast Idea Book4 screens
Stack4 screens

Verdict

The call

The clearest difference is device support: Stack at 3 against Fast Idea Book's 1. On price, ads, in-app purchases and iOS requirement 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference · 8 level
Fast Idea Book versus Stack: the parameters behind the verdict, then further details
ParameterFast Idea BookStack
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyMonthly—
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad, Mac — better
Requires iOS18.517.0 — better
Further details — not scored
Size5 MB29 MB
Age rating4+4+
DeveloperBahattin DuranSouthIndus Labs

In-app purchases

None

Fast Idea Book

No in-app purchases

None

Stack

No in-app purchases

Questions

Is Fast Idea Book free?
Fast Idea Book is free to download, with no in-app purchases.
Is Stack free?
Stack is free to download, with no in-app purchases.
Do Fast Idea Book or Stack have ads?
Neither Fast Idea Book nor Stack shows ads.

Other comparisons