Best Diagram Tree Apps

248+ iOS apps curated and reviewed

4.0 avg rating

20 free apps

Updated November 2026

Every iPhone needs a few good diagram tree apps. We benchmark 248+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Diagram Tree Apps (November 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Xmind: AI Mind Map, Brainstorm	Free	4.8★ (7K)	No	Yes	Nov 2026
2	Diagrammar: Mermaid Diagram	Free	—	No	Yes	Nov 2026
3	B-Tree (Binary Tree)	Free	—	No	No	May 2026
4	Lekh: Diagram & Flowchart App	Free	4.2★ (15)	No	Yes	Nov 2026
5	Simple Diagram	Free	—	Yes	No	Oct 2026
6	PrivyMermaid: AI Diagram	Free	—	No	Yes	Oct 2026
7	Infragraph	Free	—	No	No	Aug 2026
8	Family Tree Maker: Studio	Free	4.5★ (2)	No	Yes	Nov 2026

Top Picks for Diagram Tree

#1

Xmind: AI Mind Map, Brainstorm by Xmind Ltd.

Notes, Study, Plan & Outline

Editor's Choice

📊 Productivity

4.8😊(7K ratings)

FreeIn-App Purchases

Xmind: AI Mind Map, Brainstorm screenshot 1

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Xmind: AI Mind Map, Brainstorm screenshot 3

Xmind: AI Mind Map, Brainstorm screenshot 4

Xmind: AI Mind Map, Brainstorm screenshot 5

Xmind: AI Mind Map, Brainstorm screenshot 6

This app uses AI to transform text, photos, or sketches into structured mind maps. It offers tools for brainstorming, project management, and content organization with real-time collaboration and various export options.

What We Love

👍 Intuitive and easy to use
🚀 Powerful features even in free version
💡 Helpful for organizing thoughts and ideas
🎨 Beautiful and customizable mind maps
🔌 Seamless sync across devices

Room to Improve

🐛 Occasional crashes and data loss issues
💰 Expensive subscription model
🔍 Limited functionality in free version
🔀 Syncing issues between desktop and mobile
📝 Lack of advanced text editing features

#2

Diagrammar: Mermaid Diagram by Bakhtiyor Khodjaev

PlantUML, D2 & DOT Editor

Strong Contender

🛠️ Developer Tools

0.0(0 ratings)

FreeIn-App Purchases

Diagrammar: Mermaid Diagram screenshot 1

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Diagrammar: Mermaid Diagram screenshot 4

Diagrammar: Mermaid Diagram screenshot 5

Diagrammar: Mermaid Diagram screenshot 6

#3

B-Tree (Binary Tree) by 增宝王

Worth Considering

0.0(0 ratings)

Free

B-Tree (Binary Tree) screenshot 1

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More Diagram Tree apps to explore

Lekh: Diagram & Flowchart App

Lekh: Diagram & Flowchart App

Lekh: Diagram & Flowchart App

Whiteboard, Mind Map & Sketch

This app transforms your hand-drawn sketches into clean, precise diagrams and flowcharts. Create mind maps, floor plans, UI wireframes, and more on an infinite canvas, with AI assistance for editing and creation. It works online and offline across multiple devices.

Sketch to shape recognitionInfinite canvasPhoto markup and visual notes

📊 Productivity

free with in-app purchases

by Nhat Linh Dang

PrivyMermaid: AI Diagram

PrivyMermaid: AI Diagram

PrivyMermaid: AI Diagram

Generate, Fix & Edit Diagrams

This app allows developers and technical writers to create, edit, and export diagrams using Mermaid and D2 languages. It offers offline functionality, local rendering, and project organization for efficient diagram management on mobile devices.

Mermaid and D2 diagram creationOffline diagram renderingImport and export SVG, PNG, PDF, GIF

🛠️ Developer Tools

free with in-app purchases

Family Tree Maker: Studio

Family Tree Maker: Studio

Family Tree Maker: Studio

Photo & chart creator

Create and design beautiful family trees on an infinite canvas. Export your finished tree as a print-ready poster in various formats. Manage multiple trees privately on your device with a one-time purchase.

Infinite canvas for family tree designCustomizable themes and card stylesPrint-ready poster export (PDF, PNG)

free with in-app purchases

Drawing Studio: Draw & AI

Drawing Studio: Draw & AI

Drawing Studio: Draw & AI

draw.io, Excalidraw, Mermaid

This app combines freehand sketching, structured diagrams, and professional visuals into a unified workspace for knowledge management. Organize notes with folders, revisit past versions, and sync across Apple devices via iCloud. Export your creations in PNG or SVG formats.

Unified workspace for sketching and diagramsSupports Excalidraw, Mermaid, and draw.ioFolder organization

Taxonomy made easy

Easily build and visualize species relationship trees by entering any organisms you choose. This tool offers a fast and simple way to understand biological connections without complex software, perfect for research, study, or general curiosity.

Generate phylogenetic trees from user-entered speciesClear, organized branching diagramsCompare multiple organisms simultaneously

Flow Chart, Block Diagram

Flow Chart, Block Diagram

Flow Chart, Block Diagram

FlowChart & Workflow Creator

Easily create complex flowcharts and diagrams on a tablet with an automatic layout algorithm and shape recognition. Design professional business graphics using a variety of smart shapes for different diagram types, then export your creations to multiple formats.

Automatic layout algorithmHand-drawn shape recognitionHundreds of pre-designed smart shapes

📊 Productivity

free with in-app purchases

JSON to Diagram Visualizer

This app transforms complex JSON models into visual diagrams for easier understanding and communication. It ensures all your data remains on your device for complete privacy and security.

Transforms JSON models into visual diagramsEnhances readability of complex dataKeeps all JSON documents on your computer

🛠️ Developer Tools

free with in-app purchases

EdrawMax - AI Diagram Maker

EdrawMax - AI Diagram Maker

EdrawMax - AI Diagram Maker

Drawing Struct, Org, Flowchart

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

📊 Productivity

free with in-app purchases

Flowchart & Diagram Maker

Create and view flowcharts, mind maps, and org charts on your mobile device. This visual workspace facilitates real-time collaboration and data visualization for teams. Requires a Team or Enterprise subscription.

Create and edit diagramsPre-built templatesDrag-and-drop functionality

📊 Productivity

Goodnotes: AI Notes, Docs, PDF

Goodnotes: AI Notes, Docs, PDF

Goodnotes: AI Notes, Docs, PDF

Note taking, Planner & Journal

Capture ideas and unlock insights with powerful AI tools for note-taking, brainstorming, and document creation. Enhance productivity for professionals and students with features like AI transcription, summarization, and interactive study sets.

AI-powered transcription and summarizationInfinite canvas for brainstorming and diagrammingHandwritten notes with searchable text

📊 Productivity

free with in-app purchases

Flowdia Diagrams

Flowdia Diagrams

Flowdia Diagrams

Flowchart & Diagramming

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

📊 Productivity

free with in-app purchases

DrawExpress Diagram Lite

DrawExpress Diagram Lite

DrawExpress Diagram Lite

by DrawExpress Inc

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

📊 Productivity

Quick Family Tree

Quick Family Tree

Quick Family Tree

Easily make it with a tap.

Easily create and manage your family history with an intuitive interface. This app allows you to build interactive family trees without an account or paid services. Streamline complex relationships and visualize your ancestry with ease.

Create family trees without an accountForm relationships easily by tappingStreamline complex family trees with central display

free with in-app purchases

Heirloom Family Tree

Heirloom Family Tree

Heirloom Family Tree

Build it together

by Deasoft, OOO

Create and visualize detailed family trees for your characters and bring your stories to life. Customize profiles, store memories, and share your creations with a community of users. Syncs with a web platform for easy access.

Create detailed family treesBuild character profilesCustomize tree visuals

🎬 Entertainment

FAQ about Diagram Tree

What are the best diagram tree apps for iPhone?

Xmind: AI Mind Map, Brainstorm tops our diagram tree apps ranking as of November 2026, with a 4.8-star average from 7K App Store ratings, and it's free to download.

Are there free diagram tree apps for iPhone?

Yes — 20 of the top diagram tree apps we rank are free to download, including Xmind: AI Mind Map, Brainstorm and Diagrammar: Mermaid Diagram.

Does Xmind: AI Mind Map, Brainstorm have ads or in-app purchases?

Xmind: AI Mind Map, Brainstorm has no ads and offers in-app purchases, according to its App Store listing as of November 2026.

How many diagram tree apps are on the App Store?

We track 248+ diagram tree apps on the iOS App Store as of November 2026, ranked by rating, recency, and analysis of real user reviews.