Sparky vs Stack
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Sparky
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Great ideas deserve more than a fleeting thought. Sparky helps you capture, organize, and develop your ideas so nothing gets lost. KEY FEATURES - Instant Capture: Jot down an idea in seconds with just a title. Add details later when you're ready. - 4-Stage Workflow: Move ideas through Inbox, Exploring, Planned, and Archived stages to track their progress from spark to action. - Smart Tags: Organize ideas with custom tags and filter instantly to find exactly what you need. - Rich Details: Add summaries, detailed notes, and tags to flesh out every idea. - Quick Actions: Swipe to favorite, archive, or delete ideas without breaking your flow. - Powerful Search: Find any idea instantly with full-text search and flexible sorting options. - Beautiful Design: A modern glass morphism interface designed for iOS 26 that makes managing ideas a pleasure. Whether you're an entrepreneur brainstorming your next venture, a creative professional collecting inspiration, or anyone who wants to turn fleeting thoughts into actionable plans β Sparky is your personal idea companion. Download Sparky and never let a great idea slip away.
Stack
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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 β 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 β 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 β 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 β titles, descriptions, checklists and attachment names β 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 β 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 β 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
Verdict
The clearest difference is ads: Stack at none against Sparky's shown. Stack also leads on device support (3 vs 1). On price, in-app purchases and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Sparky | Stack |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days | β |
| Ads | Yes | No β better |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPad, Mac β better |
| Requires iOS | 18.0 | 17.0 β better |
| Further details β not scored | ||
| Size | 7 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | YongJae Kim | SouthIndus Labs |
In-app purchases
Sparky
No in-app purchases
Stack
No in-app purchases









