Comparison

Blue Sketch vs Structure Graphing

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

Head to head
About

Blue Sketch

This app allows you to quickly sketch and write ideas freely on a blue canvas. It offers essential drawing tools, page management, and sharing options. Focus on your creativity with a minimalist interface and robust organizational features.

Highlights
  • Handwritten note-taking
  • Drawing tools (pen, line, shapes)
  • Undo/Redo functionality
  • Page size and scaling options
  • Image sharing (PNG, JPG, PDF)
  • Document organization (folders, sorting)
  • Read-only mode
  • Apple Pencil support
Read full description

Sketch your idea! You can write freely and quickly because it is handwritten. You can concentrate on writing because it is the minimum function that can write only white lines on the blue canvas. Functions List: - Can be used as a notebook or notepad - Pen tool: draw a line - Straight line tool - Rectangle and Ellipse Tools - Switch between solid/dotted lines - Can change the size of the pen - Undo / Redo - Can change the page size - Can scale the page - Image sharing: Share an image as PNG, JPG, or PDF format. Also, you can share monochrome converted images. - List documents - List recently opened documents - Organize: Document folders - Sort documents and folders - Title documents and folders - Delete the document then put it into the trash box. - Restore the deleted document from the trash box. - Delete the document entirely in the trash box. - Copy documents: You can duplicate the document. Tap the copy button at the bottom right of the note screen to duplicate it. - Read-only mode: While in read-only mode, you can disable writing and prevent erroneous operations. You can change the settings by tapping the title on the note screen. - Option to use only Apple Pencil: Only available for iPad compatible with Apple Pencil. - Double-tap the Apple Pencil to switch between tools in sequence. - Apple Pencil Pro is also supported. - Can turn off/on the function the app puts the device into a sleep state if you don't touch the screen for a certain period while the page is displayed. About In-App Purchase: The first 20 pages can be used free of charge. After that, adding pages will be paid content. Please support the developer.

About

Structure Graphing

This app allows professionals and enthusiasts to create detailed graphs with various shapes, markers, and text labels. It offers features like area calculation and color-coding, with options to export in PNG or PDF formats. Premium users gain access to advanced customization and cloud storage.

Highlights
  • Graph shapes (squares, dynamic shapes, circles)
  • Add text labels and markers
  • Calculate area and linear feet
  • Color-code shapes
  • Export to PNG or PDF
  • Customizable object placement
  • Premium features: image markers, cloud storage
Read full description

Structure is a graphing app for professionals. With a variety of shapes, markers and more, Structure is the perfect tool for anyone looking to graph their next project. Structure allows users to graph shapes, calculate area and linear feet, color code shapes, add markers to indicate areas of interest and export the final output to a PNG or PDF. Whether you're a professional in need of a graphing tool or an enthusiast looking to graph your latest home project, Structure is for you. ## Features There are multiple objects that can be added to a graph. Square - A square is a four sided shape that has four lines at 90 degree angles. Dragging a corner will scale the shape in both height and width. Shape - A shape is dynamic and can have any number of points. By default, a shape has four points. Double tapping a line will add an additional point. Points can also be removed by tapping a line and then using the action menu in the bottom right corner of the screen. Dragging a corner will not impact the other corners in the shape. Circle - A circle can be added with a radius of any size. Ovals are coming soon. Lines - A line can be added as a solid line, a dotted line or an arrow. Text - A text label can be added to the graph, with a limit of 32 characters. Rectangles and structures each have an option to name a graph, which creates a text label within the shape. Markers - Markers can be added to indicate areas of interest. Markers can be customized to your needs and can also include images. Attaching images to markers is only available to Premium users. Objects - Objects can be added to indicate real-world items, such as trees, bushes, flowers and more. New objects are being added with each new release. Objects for the interior and exterior of a home are coming soon. Each shape can be customized (line width, line color, background color, etc.) by double tapping the shape or using the action menu in the bottom right corner of the screen while the shape is selected. More objects coming soon! ## Premium The Structure Premium subscription gives users additional features and cloud storage for $4.99 per month. Users with the Structure Premium subscription have access to additional features: - Create unlimited local graphs - Create graphs with unlimited objects - Custom markers with image attachments - 500MB of Cloud Storage - Export graphs in formatted PDF documents - Contact our support team from the app To upgrade to the Structure Premium subscription, go to the Settings page and tap “Upgrade to Premium”. ## Support If you would like to report a bug or make a feature request, feel free to reach out to support@structuregraphing.com. ## Terms of Use The Terms of Use can be viewed at https://structuregraphing.com/terms

Screenshots

Blue Sketch4 screens

Verdict

The call

Blue Sketch and Structure Graphing both sit at 4.7 stars, but that hides the real split: 77% of Blue Sketch's written reviews are positive against 25% of Structure Graphing's. Blue Sketch also leads on ratings volume (327 vs 55) and device support (3 vs 1). Structure Graphing's advantage is update cadence (weekly vs monthly). On price, rating, 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

Both are free to download. Blue Sketch sells 2 one-off in-app purchases and Structure Graphing sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Blue Sketch against 4.6 for Structure Graphing. That said, the two scores are not equally well evidenced: Blue Sketch has 327 ratings behind it against 55, so its average is the more settled of the two. Written reviews are what separate them: 77% of Blue Sketch's written reviews are positive against 25% of Structure Graphing's.

UpkeepUpdate frequency

Blue Sketch ships an update monthly, Structure Graphing weekly. The most recent releases landed on September 19, 2026 and July 5, 2026 respectively.

Scorecard4 real differences · 6 level
Blue Sketch versus Structure Graphing: the parameters behind the verdict, then further details
ParameterBlue SketchStructure Graphing
PriceFreeFree
Rating4.7 (327 ratings) — better4.6 (55 ratings)
Positive reviews76.9% of reviews — better25.0% of reviews
Number of ratings327 — better55
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS14.014.0
Further details — not scored
Size23 MB20 MB
Age rating4+4+
DeveloperMasaki AndoSym Technologies LLC

Customer experience

Blue Sketch

All ratings327 ratings
Positive93.3%
Neutral2.8%
Negative4.0%
Written reviews13 reviews
Positive76.9%
Neutral0.0%
Negative23.1%

Structure Graphing

All ratings55 ratings
Positive85.5%
Neutral10.9%
Negative3.6%
Written reviews4 reviews
Positive25.0%
Neutral50.0%
Negative25.0%

Bugs and requests

Blue Sketch

Reported bugs

1 issue
  • App crashed when attempting export on 2019 iPad Pro

Requested features

6 requests
  • More shapes for sketches (curves, polygons)
  • TEXT field option for readable font
  • Pinch/stretch to zoom
  • Finer and less pixelated pencil strokes
  • Option to add extra pages
Show 1 more
  • Feature to group elements for easy deletion

Structure Graphing

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Blue Sketch

One-time2
  • 10 pages$0.99
  • 30 pages$1.99
1 purchases

Structure Graphing

Subscriptions1
  • Structure Premium$4.991 Month

Questions

Is Blue Sketch free?
Blue Sketch is free to download, with in-app purchases available.
Is Structure Graphing free?
Structure Graphing is free to download, with in-app purchases available.
Which has better reviews, Blue Sketch or Structure Graphing?
Blue Sketch is rated higher. Blue Sketch averages 4.7 out of 5 from 327 ratings, while Structure Graphing averages 4.6 from 55 ratings.
Do Blue Sketch or Structure Graphing have ads?
Neither Blue Sketch nor Structure Graphing shows ads.
Which is updated more often, Blue Sketch or Structure Graphing?
Blue Sketch ships an update monthly, and Structure Graphing weekly. Most recently, Blue Sketch was updated on September 19, 2026 and Structure Graphing on July 5, 2026.

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