Gridline: Grid & Value Study
Drawing grid for painters
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Grid any reference photo, check its values in grayscale or a 2-tone notan, and paint beside it. Photos stay on your device. 3–5 tones and canvas crop are one-time Pro.
Put a grid over any reference photo and check its values on the same screen.
Gridline is a drawing grid for painters, illustrators and art students who work from reference photos. Import a picture, set up the grid, switch to grayscale or a notan when you need to judge values, and paint with your phone or iPad beside the easel.
■ Free
• Import from your photo library or take a new photo
• Square or rectangular cells, with any number of columns and rows
• Diagonals, cell numbers, line color and line thickness
• Grayscale view, a 2-tone notan, and mirror
• Paint mode: the tools disappear, touches are ignored and the screen stays awake, so the device can stand by your easel. Long-press to leave
• Unlimited projects, each one reopening with the settings you left
■ Gridline Pro (one-time purchase)
• Notan in 3, 4 or 5 tones: drag the split points on the value scale and simplify the small details
• Fit to canvas: crop to A4, 8×10, 9×12, 11×14 or 16×20 in, or square, in portrait or landscape, and see the real cell size in cm or inches
• No ads
Pro is a single purchase, not a subscription. You can restore it on other devices signed in with the same Apple Account.
■ About ads
The free version shows one banner ad at the bottom of the project list. The editor, where you look at your reference, has no ads.
■ Your photos stay on your device
Gridline keeps its own copy of each reference inside the app. There is no account or sign-up, and your images are never uploaded.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Sangwon Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
- Diagnostics
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Sangwon Kim
- Size
- 24.8 MB
- Category
- Graphics & Design
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Gridline Pro $3.99
- Copyright
- © 2026 Sangwon Kim