Comparison

Private Library vs Drawing Studio

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

Head to head
About

Private Library

Features
Read full description

A Calibre iOS client that connects to Calibre's content server. Note! This is for those who manage e-books with calibre.That the app does not provide any books. - You can browse the eBook in Calibre. - Monitor the health status of Calibre content services in real time. - You can sort e-books based on different criteria. - View the details of the eBook. - Different libraries can be switched, just like a real bookshelf. - You can switch between different content servers.

About

Drawing Studio

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.

Highlights
  • Unified workspace for sketching and diagrams
  • Supports Excalidraw, Mermaid, and draw.io
  • Folder organization
  • Auto version history
  • iCloud sync across devices
  • Export to PNG/SVG
Features
Read full description

Draw, organize, and create with AI. Drawing Studio brings draw.io, Excalidraw, and Mermaid editing together with AI diagram generation and editing. Sketch by hand, build structured diagrams, or write diagrams as code. Use a prompt to create a diagram or a conversation to update an existing one. Keep your documents organized with folders, version history, and iCloud sync. THREE EDITORS, ONE DOCUMENT WORKSPACE • Excalidraw: hand-drawn-style sketches, whiteboards, and visual notes with shapes, text, and arrows. • draw.io: structured diagrams for systems, processes, UML, and technical documentation. • Mermaid: diagrams as code, including flowcharts, sequence diagrams, class diagrams, and Gantt charts. Drawing and editing do not require AI setup. Work directly in the editor, create with AI, or combine both approaches in the same document. FROM A PROMPT TO AN EDITABLE DIAGRAM Ask for a first draft instead of starting from a blank canvas: • "Create a flowchart for an order, from payment to delivery." • "Draw a sequence diagram for a user signing in." • "Make a mind map for planning a product launch." Keep working on the same drawing. Ask AI to add an exception path, rename steps, or reorganize a section. The assistant can read and update the current document, so the result is an editable diagram, not just an image or a reply to copy elsewhere. KEEP YOUR WORK ORGANIZED • Group drawings into folders by project or topic. • Revisit earlier versions with document history. • Keep AI conversations associated with each drawing. • Sync your work across iPhone, iPad, and Mac with iCloud. • Export diagrams as PNG or SVG to share with others. BUILT FOR IDEAS THAT NEED EXPLAINING Map a business process, explain a software architecture, plan a project, or turn study notes into a visual outline. Move from a rough draft to a diagram you can refine and reuse. CHOOSE YOUR AI MODEL AI use requires a configured, compatible model; availability and results depend on the model and provider. Third-party services may require an account and charge for usage separately. YOUR DOCUMENTS AND AI REQUESTS Documents are stored locally and can sync through iCloud. When you use a cloud AI provider, your prompts and document content needed for the task are sent to that provider for processing. Its terms and privacy policy apply. Review generated diagrams before relying on or sharing them.

Screenshots

Private Library4 screens
Drawing Studio4 screens

Verdict

The call

The clearest difference is price: Drawing Studio at Free against Private Library's $1.99. Drawing Studio also leads on update cadence (every 9 days vs every 18 months). On ads, in-app purchases, device support 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

Drawing Studio is free to download; Private Library costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Private Library ships an update every 18 months, Drawing Studio every 9 days. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 8 level
Private Library versus Drawing Studio: the parameters behind the verdict, then further details
ParameterPrivate LibraryDrawing Studio
Price$1.99Free — better
Rating—3.5 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 18 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS16.0 — better17.0
Further details — not scored
Size9 MB89 MB
Age rating4+4+
Developer艳华 顾兴驰 马

In-app purchases

None

Private Library

No in-app purchases

None

Drawing Studio

No in-app purchases

Questions

Is Private Library free?
Private Library costs $1.99, with no in-app purchases.
Is Drawing Studio free?
Drawing Studio is free to download, with no in-app purchases.
Do Private Library or Drawing Studio have ads?
Neither Private Library nor Drawing Studio shows ads.
Which is updated more often, Private Library or Drawing Studio?
Private Library ships an update every 18 months, and Drawing Studio every 9 days. Most recently, Private Library was updated on November 6, 2026 and Drawing Studio on October 30, 2026.

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