Comparison

iDesign vs Slope Calc

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

Head to head
About

iDesign

Create professional 2D vector drawings, illustrations, and technical designs on your iPad or iPhone. Offers precise touch-based editing with unique offset controls and a full suite of advanced tools for graphics and technical design.

Highlights
  • 2D vector drawing and design
  • Precise touch-based editing
  • Advanced path editing
  • Technical drawing tools
  • Shape libraries
  • Layer management
  • iCloud sync with XDesign
Features
Read full description

Precision 2D vector drawing and design on the iPad & iPhone. Make professional quality designs, illustrations and technical drawings on the move using your fingers at last! iDesign has unique features and offset controls which allows you to draw accurately with your finger not getting in the way or blocking your view. Full feature compatibility and automatic sync of designs via iCloud with XDesign (Mac version). User Guide (PDF) available at www.touchaware.com/apps/idesign/userguide FEATURES - A universal app for both iPad and iPhone which adapts to the native screen size of the device. - An unobtrusive icon based visual and context driven user interface with a full screen board view - Toolbars and panels with easy access to frequently used functions for a fast work flow Standard Tools & Functions - Line, polyline, square, rectangle, circle, arc, ellipse, polygons, stars & path tools - Copy and paste selected shapes and groups - Group and ungroup shapes hierarchically to create complex designs - Edit points, convert shapes to path, close shapes, add and remove points, break, weld, explode and join - Precise rotation with ability to rotate at user defined center - Object alignment tools - Fill color and pen color swatches with opacity controls, custom RGB mixer - Stroke width, line style, line caps and corner join styles, arrow ends and dash patters - Text insertion with fonts, styles, sizes, paragraph alignments, multilingual, rotate/resize - Set a background image for tracing/marking over it - Insert images, copy, paste, move, resize and position them accordingly - Multilevel Undo/Redo for all edit operations - Create multiple layers to organize & separate design components - Connector tools for drawing charts and flow diagrams Unique Features for Touch Based Editing - Offset handles for moving and positioning without your finger blocking the view - Nudge controls, allows precise movement of selected shapes or selected points - Delta transformations to apply incremental values by keyboard Advanced Tools for Graphics Design - Advanced path editing options for corner, smooth and symmetric control points, straighten and curve segments - Text to path conversion - Boolean operations on shapes, unite, intersect, subtract, exclude - Freehand drawing, auto smoothened paths - Gradients / color blends Advanced Tools for Technical Drawing - Circle and Arc tool based on center, start/end point, radius and angle of arc - Dimensioning tools, length as well as angular with customisable settings - Support for Feet+Inches+Fractions (U.S & older unit system)
- Architectural formatting option for Dimensions
- Dynamic grid supporting feet, inches and inch fractions at different zoom levels Units & Board Setup - Support for standard and custom board sizes. - Set a drawing scale - Full set of standard unit systems. - Unit aware Grid with customisable settings - Snap to grid, snap to object and points - Unit aware rulers Shape libraries to organise and reuse shapes - Add, remove and organise shapes in your own libraries - A set of standard shapes for creating floor plans included Export/Import & Print - Export designs to JPEG, PNG, PDF & SVG formats - Import SVG files - Share your designs with other iDesign users via Email - Dropbox support for Export, Import - AirPrint Support iDesign is available as a monthly or yearly subscription and includes a free trial period that begins once your purchase has been confirmed with your Apple ID account. At the end of the trial your subscription will start and renew automatically. Your Apple ID account will be charged for the upcoming period unless you disable auto-renew or cancel your subscription in your Account Settings at least 24-hours prior to the end of the current period. Terms of Use: http://www.touchaware.com/apps/termsofuse Privacy policy: http://www.touchaware.com/apps/privacy

About

Slope Calc

Features
Read full description

“Why is the size of Calculator each buttons same? “ “How order is the priority of Calculator button? “ “What type Calculator is designed ,According to this priority? “ From those point,I redesign Calculator. Calculator is for Calculation.Not for inputting number. Consequently, the most important button is NOT number buttons. The most important button is 4 arithmetical operation buttons. I design those 4 arithmetical operation button is bigger than 10 number buttons. I put those 4 buttons around number buttons(relative position). And if you incline your iPhone to the direction of top and bottom right and left , you can input 4 arithmetical operation. ・Future function additional plan Equal sign input by the gesture

Screenshots

iDesign4 screens
Slope Calc2 screens

Verdict

The call

The clearest difference is price: iDesign at Free against Slope Calc's $0.99. iDesign also leads on update cadence (every 3 months vs every 21 months). Slope Calc's advantage is in-app purchases (none vs 3) and iOS requirement (7.0 vs 15.5). On ads and device support 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

iDesign is free to download; Slope Calc costs $0.99 up front. iDesign sells 3 in-app purchases, starting at $6.99 per month. Slope Calc asks for nothing beyond the download.

UpkeepUpdate frequency

iDesign ships an update every 3 months, Slope Calc every 21 months. The most recent releases landed on November 1, 2026 and November 10, 2026 respectively.

Scorecard4 real differences · 6 level
iDesign versus Slope Calc: the parameters behind the verdict, then further details
ParameteriDesignSlope Calc
PriceFree — better$0.99
Rating2.6 (87 ratings) — better—
Positive reviews50.2% of reviews—
Number of ratings87 — better—
Update frequencyEvery 3 months — betterEvery 21 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.57.0 — better
Further details — not scored
Size86 MB1 MB
Age rating4+4+
DeveloperTouchAware LimitedYosuke Kurashima

In-app purchases

3 purchases

iDesign

Subscriptions2
  • Monthly Subscription14 Days trial$6.991 Month
  • Yearly Subscription14 Days trial$39.991 Year
One-time1
  • Lifetime$79.99
None

Slope Calc

No in-app purchases

Questions

Is iDesign free?
iDesign is free to download, with in-app purchases available.
Is Slope Calc free?
Slope Calc costs $0.99, with no in-app purchases.
Do iDesign or Slope Calc have ads?
Neither iDesign nor Slope Calc shows ads.
Which is updated more often, iDesign or Slope Calc?
iDesign ships an update every 3 months, and Slope Calc every 21 months. Most recently, iDesign was updated on November 1, 2026 and Slope Calc on November 10, 2026.

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