Best Diagram Apps

248+ iOS apps curated and reviewed

4.3 avg rating
19 free apps
Updated August 2026

Out of 248+ diagram apps on iOS, 19 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Diagram Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1LucidchartLucidchartFree4.6ā˜… (5.3K)YesNoAug 2026
2Simple DiagramSimple DiagramFree—YesNoMay 2026
3Mind MappingMind MappingFree4.6ā˜… (379)YesYesAug 2026
4Xmind: AI Mind Map, BrainstormXmind: AI Mind Map, BrainstormFree4.8ā˜… (7K)NoYesAug 2026
5Flowdia DiagramsFlowdia DiagramsFree3.4ā˜… (66)NoYesAug 2026
6CarminCarminFree4.3ā˜… (223)YesYesAug 2026
7EdrawMax - AI Diagram MakerEdrawMax - AI Diagram MakerFree3.4ā˜… (33)NoYesAug 2026
8Diagram: Daily Concept SummaryDiagram: Daily Concept SummaryFree5.0ā˜… (1)NoNoAug 2026

Top Picks for Diagram

Lucidchart#1

Lucidchart by Lucid Software Inc

Flowchart & Diagram Maker
Editor's Choice
šŸ“Š Productivity
4.6šŸ˜ž(5.3K ratings)
FreeAdsIn-App Purchases
Lucidchart screenshot 1
Lucidchart screenshot 2
Lucidchart screenshot 3
Lucidchart screenshot 4
Lucidchart screenshot 5

Create and view diagrams like flowcharts, mind maps, and org charts on your mobile device. This visual workspace facilitates real-time collaboration and data visualization. Diagrams sync instantly to your account and can be exported in various formats.

What We Love

  • šŸš€ Intuitive interface
  • šŸ‘ Great for creating diagrams and flowcharts
  • šŸ’” Useful templates and shapes

Room to Improve

  • šŸ› Frequent crashes and bugs
  • šŸ”’ Locked features behind paywall
  • šŸ‘Ž Poor mobile experience compared to web version
Mind Mapping#3

Mind Mapping by Yalex FZC LLC

Brainstorm with ease
Worth Considering
šŸ“Š Productivity
4.6(379 ratings)
FreeAdsIn-App Purchases
Mind Mapping screenshot 1
Mind Mapping screenshot 2
Mind Mapping screenshot 3
Mind Mapping screenshot 4
Mind Mapping screenshot 5

Organize your thoughts and ideas into structured visual formats like mind maps, flowcharts, and outlines. This app offers extensive customization, sharing, and export options for seamless idea management.

More Diagram apps to explore

4
Xmind: AI Mind Map, Brainstorm
Xmind: AI Mind Map, Brainstorm
Xmind: AI Mind Map, Brainstorm
Outline, Plan, Notes & Slides
Free

This app is a comprehensive tool for mind mapping and brainstorming, helping users organize thoughts, manage projects, and visualize information. It offers various structures, templates, and customization options to enhance creativity and productivity. Collaborate in real-time and export your work in multiple formats.

30+ Templates9 Structure TypesAudio Notes
šŸ“Š Productivity
(7K)
free with in-app purchases
5
Flowdia Diagrams
Flowdia Diagrams
Flowdia Diagrams
Flowchart & Diagramming
Free

Create professional flowcharts, mind maps, and various other diagrams with an intuitive interface. Easily connect shapes, add elements, and customize your designs. Export your work in multiple formats, including PNG, JPG, PDF, and SVG.

Create flowcharts, mind maps, BPMN, and network diagramsIntuitive shape connection and element additionCustomizable shape appearance
šŸ“Š Productivity
(66)
free with in-app purchases
6
Carmin
Carmin
Carmin
Automotive Wiring Diagrams
Free

Access a comprehensive library of regularly updated automotive electrical wiring diagrams for car repair and study. Includes videos and technical documents for research and reference.

Electrical wiring diagramsRegularly updated diagramsVideos library
šŸ” Reference
(223)
free with in-app purchases
7
EdrawMax - AI Diagram Maker
EdrawMax - AI Diagram Maker
EdrawMax - AI Diagram Maker
Drawing Struct, Org, Flowchart
Free

This AI-powered diagramming tool transforms your ideas into professional visuals effortlessly. Create flowcharts, org charts, mind maps, and more with extensive templates and smart AI assistance. Collaborate seamlessly and export to various formats.

Photo to editable diagram conversionAI-powered diagram generation40,000+ templates and 17,000+ symbols
šŸ“Š Productivity
(33)
free with in-app purchases
8
Diagram: Daily Concept Summary
Diagram: Daily Concept Summary
Diagram: Daily Concept Summary
Learn concepts daily
Free

Discover new concepts daily across 10 categories including business, economy, and psychology. Interactive swiping, breathing breaks, and quizzes enhance memory retention. New content is added regularly to keep learning fresh.

Daily concept discovery100+ concepts10+ categories
šŸ“š Education
(1)
free
9
DrawExpress Diagram Lite
DrawExpress Diagram Lite
DrawExpress Diagram Lite
by DrawExpress Inc
Free

Create diagrams and flowcharts quickly and intuitively using simple gestures. Ideal for software design, business, and academic needs, it offers a pen-and-paper like experience for various diagram types.

Gesture-based diagrammingFlowchart creationUML diagramming
šŸ“Š Productivity
(25)
free
10
Grapholite Diagrams Maker
Grapholite Diagrams Maker
Grapholite Diagrams Maker
FlowChart & Infographics
Free

Create a wide range of business graphics and technical drawings, from simple sketches to professional documents. Features include freehand drawing recognition, extensive stencil libraries, and advanced connection routing. Export to various formats like PDF, PNG, SVG, and Visio.

Flow chart creationFloor plan designNetwork layout diagrams
šŸ’¼ Business
(8)
free with in-app purchases
11
Microsoft Whiteboard
Microsoft Whiteboard
Microsoft Whiteboard
Your digital smartboard
Free

This app offers a freeform digital canvas for individuals and teams to brainstorm, create, and collaborate visually. It supports touch, type, and pen input, allowing for seamless real-time teamwork from anywhere. Your work is automatically saved to the cloud for easy access across devices.

Infinite freeform canvasReal-time team collaborationTouch, type, and pen support
šŸ“Š Productivity
(12K)
free
12
Editor for Visio Diagrams
Editor for Visio Diagrams
Editor for Visio Diagrams
Open & Edit Visio .vsdx Files
Free
šŸŽØ Graphics & Design
(0)
13
Notes Writer: PDF, Voice, AI
Notes Writer: PDF, Voice, AI
Notes Writer: PDF, Voice, AI
Notepad, Word, Pencil & Scan
Free

This app is a comprehensive note-taking and PDF editing solution for mobile devices. It allows users to write, format, and organize notes, annotate PDFs, fill forms, and scan documents. The app offers advanced editing tools, powerful search, and seamless sharing and export options.

Write and format notesAnnotate PDFs and fill formsOrganize with unlimited notebooks
šŸ“Š Productivity
(7.3K)
free with in-app purchases
14
Miro: your visual workspace
Miro: your visual workspace
Miro: your visual workspace
Build the next big thing
Free

This app provides a collaborative visual workspace for teams to brainstorm, design, and build projects together. It offers a limitless digital canvas for idea visualization, note-taking, and workflow management, accessible from anywhere.

Limitless digital canvasOnline meetings and workshopsBrainstorming and idea generation
šŸ“Š Productivity
(5.7K)
freemium
15
Autowire - Car Wiring Diagrams
Autowire - Car Wiring Diagrams
Autowire - Car Wiring Diagrams
Wiring Diagrams & Car Repair
Free
šŸ”§ Utilities
(0)
16
Shogi Diagram Maker
Shogi Diagram Maker
Shogi Diagram Maker
Generate Shogi diagrams
Free
šŸ”§ Utilities
(0)
17
GG AI Diagram
GG AI Diagram
GG AI Diagram
Create diagrams with AI.
$4.99
šŸ› ļø Developer Tools
(0)
18
Zen Diagram
Zen Diagram
Zen Diagram
Relaxing Digital Art
Free
šŸŽ¬ Entertainment
(0)
19
Lekh: whiteboard & diagramming
Lekh: whiteboard & diagramming
Lekh: whiteboard & diagramming
Diagram & Flowchart Maker
Free

This app provides an infinite canvas for freehand drawing and creating various diagrams. It intelligently converts sketches into precise shapes and connections, supporting a wide range of diagram types for business, design, and planning.

Infinite canvas for drawingSmart diagram and flowchart creationLayout and inspection report drawing
šŸ“Š Productivity
(14)
free with in-app purchases
20
Sunburst Diagram
Sunburst Diagram
Sunburst Diagram
by Ludovic Landry
Free

Visualize and interact with parameters for sunburst diagrams. This open-source library, built with SwiftUI, easily renders diagrams from object trees. It offers an alternative to ring charts, sunburst charts, and multilevel pie charts.

Sunburst diagram visualizationInteractive parameter adjustmentSwiftUI implementation
šŸ› ļø Developer Tools
(2)
free

FAQ about Diagram

What are the best diagram apps for iPhone?
Lucidchart tops our diagram apps ranking as of August 2026, with a 4.6-star average from 5.3K App Store ratings, and it's free to download.
Yes — 19 of the top diagram apps we rank are free to download, including Lucidchart and Simple Diagram.
Lucidchart shows ads and has no in-app purchases, according to its App Store listing as of August 2026.
We track 248+ diagram apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
Lucidchart is a visual workspace that allows users to create and collaborate on various types of diagrams, including flowcharts, mind maps, org charts, and UML diagrams. It facilitates data visualization and real-time teamwork to enhance understanding and drive innovation.
The app allows you to create and edit documents, start with pre-built templates, and use drag-and-drop functionality. It also offers offline viewing of recent documents, real-time collaboration with in-editor commenting, and easy sharing options.

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