Comparison

Cardflow+ Mind Map Storyboard vs KnowledgeBase Builder

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

Head to head
About

Cardflow+ Mind Map Storyboard

This app digitizes the tactile experience of using index cards on an iPad. It allows users to brainstorm, plan projects, and organize ideas with a flexible, freeform layout. Capture thoughts with writing, drawing, or photos, and arrange them on a digital board.

Highlights
  • Digital index card creation
  • Freeform layout and organization
  • Inkflow vector ink system
  • Typing with various fonts
  • Photo import for backgrounds
  • Project planning and storyboarding
Features
Read full description

Cardflow+ is the full version of Cardflow: index cards on a big, free-form board, with the tools to connect, style, and share them. Write or sketch on a card with Apple Pencil, flip it over like the real thing, and arrange as many as you need. No rigid structure up front. Lay things out however makes sense to you. WE LOVE INDEX CARDS. We use them a lot. They are a versatile and surprisingly powerful tool for all kinds of tasks. From brainstorming to storyboards, to planning entire projects, they have a place in your workflow. Cardflow captures the ease and flexibility of paper index cards and brings that experience to the iPad. Rather than impose a rigid structure up front, Cardflow allows you to lay things out however you like, and organize them in the way that makes sense to you. Jot down ideas or sketch diagrams on cards and arrange them on a large board. Write and draw using the buttery smooth Inkflow vector ink system, or type in a variety of fonts. You can even snap photos of actual cards to use as a background. Turbocharge your workflow today! Whether you are drafting story boards for a movie, laying out the plot and characters for your novel, or learning a new language, Cardflow has a place in your toolbox. Have all the fun of using index cards, without the forest-pulping guilt of paper. EDUCATORS: Cardflow+ qualifies for Apple's Volume Purchase Program. Purchase it in quantities of 20 or more at a discount from Apple's VPP site. HOW TO TRANSFER FILES FROM CARDFLOW Cardflow+ is installed as a separate App. To transfer a file from Cardflow to Cardflow+: 1. Tap on the file name in the Cardflow Gallery. 2. Tap "Transfer" in the context menu. 3. Select Cardflow+ from the list of Apps. Cardflow is perfect for: + Storyboards for videos or movies + Studying for an exam + Learning a new language + Writing the plot for a novel or book + Organizing weddings, parties, and other events + Corporate training + Project management + Agile, Scrum, and other methodologies + Group brainstorming + Writing your daily goals and to-dos + And much more! CREATIVE TOOLS FOR THE ULTIMATE CREATIVITY DEVICE We strongly believe that the iPad is not just a consumption device; It's a creativity device. Thanks for supporting us in our journey of building Creative Apps like Cardflow. We hope you enjoy using it! -- The App Makers @ Qrayon

About

KnowledgeBase Builder

Organize and search text documents and web pages with links within a mind map structure. Automatically create mind maps from text, import Wikipedia articles, and export your knowledge base as HTML. Also functions as a flowcharting tool.

Highlights
  • Save text documents and web pages
  • Full-text search
  • Organize with mind maps
  • Automatic mind map creation
  • Wikipedia import
  • Export to HTML
  • Flowcharting tool
Features
Read full description

The infinite mind map for iPhone & iPad: millions of connected ideas in a single file. Traditional mind mapping tools hit their limits at 50 to 100 nodes and force you into a rigid tree. InfoRapid KnowledgeBase Builder is a true knowledge network for personal knowledge management and your digital "second brain": any item can be linked to any other, every connection carries its own label, and your database grows to millions of entries without becoming cluttered. Just like in Google Earth, you always see exactly the area you are interested in – a tap smoothly centers any item. SPECTACULAR 3D VIEW Experience your knowledge in space: the interactive 3D view arranges your network as a sphere, an orrery or a planetarium. Fly from item to item with smooth camera moves, or let presentation mode take you on a guided tour – perfect for talks, teaching and videos. WHITEBOARD, MIND MAP AND KANBAN IN ONE APP Start freely on the whiteboard: ideas, notes and tasks float on an infinite canvas. As your thoughts take shape, arrange them as a mind map with one tap – or as a Kanban or Scrum board for projects and tasks. Drag a card into the next column with your finger or Apple Pencil and its status follows automatically. TIMELINE FOR DATES AND DEADLINES Give every item a start, end, due date, status, priority and owner. The timeline shows your whole project at a glance; drag a bar with a swipe to reschedule, tap it to open the item. EVERY DIAGRAM TYPE, AUTOMATICALLY ARRANGED Connect items by drag and drop using touch or Apple Pencil and label every relationship. A single tap arranges the whole network radially, symmetrically, hierarchically or as a table. Create mind maps, concept maps, flowcharts, org charts, family trees and even mathematical formulas (LaTeX). The app can also draw flowcharts straight from pseudocode. NOTES, RICH TEXT AND ATTACHMENTS Every item holds more than a title: formatted notes with tables, checklists and links to other items. Attach PDFs, Word and Excel files, images or web links directly – with automatic previews. FULL-TEXT SEARCH INSIDE YOUR DOCUMENTS The lightning-fast search finds not only item names but also the text in your notes and attached documents. OPTIMIZED FOR TOUCH & APPLE PENCIL Interact with your knowledge base naturally and fluidly: navigate with pinch-to-zoom, draw and connect thoughts directly with your finger or Apple Pencil. Whether on the go with your iPhone or on the expansive canvas of the iPad Pro, the interface adapts effortlessly to your device. WIKIPEDIA, WIKIDATA AND OBSIDIAN IMPORT Search Wikipedia or Wikidata right inside the app and turn entire articles, including their relationships, into a ready-made mind map. Text analysis automatically extracts the key terms from your own texts. Complete Obsidian vaults can be imported, too. CATEGORIES, TAGS AND FILTERS Group items by color and topic and hide entire branches with a single switch. ALSO INCLUDED • Learn with flashcards: the app turns your mind maps into flashcards and cloze tests for school, university and work. • Undo without worry: up to 200 steps are kept – even after a restart. • Open formats: import and export as JSON, XML, CSV, text document, image or 3D model. • Your data stays with you: every knowledge base is a fast SQLite file (.kdb) stored directly on your device. 100% offline, no account, no cloud lock-in, no tracking. • Seamless sync via iCloud Drive: share and edit the exact same .kdb file across iPhone, iPad, and your Mac or PC.

Screenshots

KnowledgeBase Builder4 screens

Verdict

The call

The clearest difference is price: KnowledgeBase Builder at $8.99 against Cardflow+ Mind Map Storyboard's $14.99. KnowledgeBase Builder also leads on review sentiment (91% vs 69%) and device support (3 vs 1). Cardflow+ Mind Map Storyboard's advantage is ratings volume (1.5K vs 24). On rating, 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

CostPrice · In-app purchases · Ads · Monetization

Cardflow+ Mind Map Storyboard costs $14.99 and KnowledgeBase Builder $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Cardflow+ Mind Map Storyboard against 4.7 for KnowledgeBase Builder. That said, the two scores are not equally well evidenced: Cardflow+ Mind Map Storyboard has 1.5K ratings behind it against 24, so its average is the more settled of the two. Written reviews are what separate them: 69% of Cardflow+ Mind Map Storyboard's written reviews are positive against 91% of KnowledgeBase Builder's.

UpkeepUpdate frequency

Cardflow+ Mind Map Storyboard ships an update weekly, KnowledgeBase Builder every 2 weeks. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

Scorecard4 real differences · 6 level
Cardflow+ Mind Map Storyboard versus KnowledgeBase Builder: the parameters behind the verdict, then further details
ParameterCardflow+ Mind Map StoryboardKnowledgeBase Builder
Price$14.99$8.99 — better
Rating4.6 (1.5K ratings)4.7 (24 ratings) — better
Positive reviews69.4% of reviews90.9% of reviews — better
Number of ratings1.5K — better24
Update frequencyWeekly — betterEvery 2 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS15.615.0 — better
Further details — not scored
Size21 MB22 MB
Age rating17+4+
DeveloperQrayon, LLCIngo Straub

Customer experience

Cardflow+ Mind Map Storyboard

All ratings1,472 ratings
Positive90.1%
Neutral4.6%
Negative5.3%
Written reviews255 reviews
Positive69.4%
Neutral11.8%
Negative18.8%

KnowledgeBase Builder

All ratings24 ratings
Positive95.8%
Neutral0.0%
Negative4.2%
Written reviews22 reviews
Positive90.9%
Neutral0.0%
Negative9.1%

Bugs and requests

Cardflow+ Mind Map Storyboard

Reported bugs

3 issues
  • Cards randomly losing content
  • Exporting issues with images and links
  • Inconsistent behavior when flipping cards

Requested features

6 requests
  • Add a study/quiz mode for flashcards
  • Improve syncing and cloud integration
  • Allow multiple images per card
  • Provide more customization options for text and formatting
  • Implement a highlighter tool separate from the pen
Show 1 more
  • Add the ability to lock or protect boards

KnowledgeBase Builder

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Cardflow+ Mind Map Storyboard

No in-app purchases

None

KnowledgeBase Builder

No in-app purchases

Questions

Is Cardflow+ Mind Map Storyboard free?
Cardflow+ Mind Map Storyboard costs $14.99, with no in-app purchases.
Is KnowledgeBase Builder free?
KnowledgeBase Builder costs $8.99, with no in-app purchases.
Which has better reviews, Cardflow+ Mind Map Storyboard or KnowledgeBase Builder?
KnowledgeBase Builder is rated higher. Cardflow+ Mind Map Storyboard averages 4.6 out of 5 from 1.5K ratings, while KnowledgeBase Builder averages 4.7 from 24 ratings.
Do Cardflow+ Mind Map Storyboard or KnowledgeBase Builder have ads?
Neither Cardflow+ Mind Map Storyboard nor KnowledgeBase Builder shows ads.
Which is updated more often, Cardflow+ Mind Map Storyboard or KnowledgeBase Builder?
Cardflow+ Mind Map Storyboard ships an update weekly, and KnowledgeBase Builder every 2 weeks. Most recently, Cardflow+ Mind Map Storyboard was updated on November 1, 2026 and KnowledgeBase Builder on November 2, 2026.

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