Comparison

RubySketch vs App大学 (旧Flutter大学)

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

Head to head
About

RubySketch

This app provides a Ruby interpreter and text editor, allowing users to write and run Ruby scripts. It also features a graphics API compatible with Processing for creative coding on mobile devices.

Highlights
  • Built-in Ruby interpreter (CRuby/MRI)
  • Processing-compatible graphics API
  • Text editor with easy cursor movement
  • Physics-capable sprites
  • Image input from camera
  • Sound playback
  • Sample scripts and games
Features
Read full description

This app includes Ruby language interpreter known as CRuby or MRI (Matz Ruby Implementation) and a simple text editor. So you can edit and run a ruby script. It also has an API that is almost compatible with Processing that is well known as a Creative Coding framework. So you can enjoy graphics programming on your iPhone or iPad. Key Features - Built-in Ruby interpreter (CRuby / MRI) - Processing-compatible graphics API with shaders available - Built-in text editor that makes moving the cursor painless - Physics-capable sprites - Image input from camera - Sound playback - Includes many sample scripts, including simple games This is a list of functions implemented to be compatible with the Processing API. --- abs, acos, alpha, angleMode, applyMatrix, arc, asin, atan, atan2, background, beginContour, beginShape, bezier, bezierDetail, bezierPoint, bezierTangent, bezierVertex, blend, blendMode, blue, brightness, ceil, circle, clear, clip, color, colorMode, constrain, copy, cos, createCanvas, createCapture, createFont, createGraphics, createImage, createShader, createShape, createVector, curve, curveDetail, curvePoint, curveTangent, curveTightness, curveVertex, degrees, deltaTime, displayDensity, displayHeight, displayWidth, dist, doubleClicked, draw, ellipse, ellipseMode, endContour, endShape, exp, fill, filter, floor, focused, frameCount, frameRate, fullScreen, fullscreen, green, height, hue, image, imageMode, key, keyCode, keyIsDown, keyIsPressed, keyPressed, keyReleased, keyTyped, lerp, lerpColor, line, loadFont, loadImage, loadPixels, loadShader, log, loop, mag, map, max, min, motion, motionGravity, mouseButton, mouseClicked, mouseDragged, mouseMoved, mousePressed, mouseReleased, mouseWheel, mouseX, mouseY, noClip, noFill, noLoop, noSmooth, noStroke, noTint, noise, noiseDetail, noiseSeed, norm, pixelDensity, pixelHeight, pixelWidth, pixels, pmouseX, pmouseY, point, pop, popMatrix, popStyle, pow, printMatrix, push, pushMatrix, pushStyle, quad, quadraticVertex, radians, random, randomGaussian, randomSeed, rect, rectMode, red, redraw, renderMode, requestImage, resetMatrix, resetShader, rotate, rotateX, rotateY, rotateZ, round, saturation, save, scale, setTitle, setup, shader, shape, shapeMode, shearX, shearY, sin, size, smooth, sq, sqrt, square, stroke, strokeCap, strokeJoin, strokeWeight, tan, text, textAlign, textAscent, textDescent, textFont, textLeading, textSize, textWidth, texture, textureMode, textureWrap, tint, touchEnded, touchMoved, touchStarted, touches, translate, triangle, updatePixels, vertex, width, windowHeight, windowMove, windowMoved, windowOrientation, windowResizable, windowResize, windowResized, windowWidth, windowX, windowY

About

App大学 (旧Flutter大学)

This app offers a specialized learning community for mobile app development. It provides various learning plans and community features to help users master app creation.

Highlights
  • Mobile app development focus
  • Learning community
  • Specialized learning plans
  • Community features
Features
Read full description

スマホアプリ開発に特化した学習コミュニティ「App大学」の公式アプリです! ライセンス同意書 https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

RubySketch2 screens
App大学 (旧Flutter大学)4 screens

Verdict

The call

The clearest difference is review sentiment: RubySketch at 100% against App大学 (旧Flutter大学)'s 33%. App大学 (旧Flutter大学)'s advantage is ads (none vs shown) and update cadence (every 9 days vs every 5 weeks). On price, in-app purchases, monetization model 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

Both are free to download. RubySketch sells 1 one-off in-app purchase and App大学 (旧Flutter大学) sells 5 in-app purchases, starting at $19.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

RubySketch ships an update every 5 weeks, App大学 (旧Flutter大学) every 9 days. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.

Scorecard4 real differences · 6 level
RubySketch versus App大学 (旧Flutter大学): the parameters behind the verdict, then further details
ParameterRubySketchApp大学 (旧Flutter大学)
PriceFreeFree
Rating4.7 (24 ratings) — better—
Positive reviews100.0% of reviews — better33.3% of reviews
Number of ratings24 — better—
Update frequencyEvery 5 weeksEvery 9 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.014.0 — better
Further details — not scored
Size82 MB123 MB
Age rating4+17+
DeveloperNoritaka SuzukiKBOY, LLC.

Customer experience

RubySketch

All ratings24 ratings
Positive95.8%
Neutral0.0%
Negative4.2%
Written reviews11 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

App大学 (旧Flutter大学)

Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

In-app purchases

1 purchases

RubySketch

One-time1
  • Remove Ads$9.99
5 purchases

App大学 (旧Flutter大学)

Subscriptions5
  • コミュニティプラン$19.991 Month
  • 課題学習プラン$39.991 Month
  • AI修行プラン$69.991 Month
Show 2 more
  • ライト修行プラン$79.991 Month
  • Flutter修行プラン$99.991 Month

Questions

Is RubySketch free?
RubySketch is free to download, with in-app purchases available.
Is App大学 (旧Flutter大学) free?
App大学 (旧Flutter大学) is free to download, with in-app purchases available.
Do RubySketch or App大学 (旧Flutter大学) have ads?
RubySketch shows ads; App大学 (旧Flutter大学) does not.
Which is updated more often, RubySketch or App大学 (旧Flutter大学)?
RubySketch ships an update every 5 weeks, and App大学 (旧Flutter大学) every 9 days. Most recently, RubySketch was updated on September 21, 2026 and App大学 (旧Flutter大学) on September 11, 2026.

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