Comparison

Value Study vs Caydo Art Design

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

Head to head
About

Value Study

This app helps artists improve their skills by analyzing light and shadow in reference images. It allows users to break down tones step-by-step, from simple black and white to more complex value ranges, aiding in the understanding of depth and form. It's a tool to enhance traditional art studies.

Highlights
  • Step-by-step tone breakdown
  • Highlighting areas of same value
  • Focus on light, shadow, and form
  • Greyscale value studies
  • Works with reference images
Features
Read full description

In art, value (or tone) refers to how light or dark a colour is. If you're learning to paint or draw, doing value studies is one of the best ways to improve. These small, loose sketches in greyscale help you understand where shadows fall and highlights appear—essential for capturing depth and form. Value Study is a simple, focused tool designed to help you see values more clearly in your reference images. Instead of just converting a photo to black and white, this app lets you break down tones step by step. Start with just black and white to map out the biggest shapes, then gradually add more values to refine your understanding. You can also highlight all areas of an image that share the same value, making it easier to see subtle shifts in tone. This is especially useful in complex references, like portraits, where different parts of the image might have the same level of shadow but look completely different in colour. Value Study isn’t here to replace traditional studies—it’s here to enhance them. Whether you're sketching, painting, or working digitally, this tool makes it easier to focus on the fundamentals of light, shadow, and form. Try it for free with all features enabled on sample images from Unsplash before deciding to unlock the full app with a low-cost yearly or lifetime purchase. All Value Study Pro upgrades count as lifetime purchase. Either option will unlock Value Study across iPhone, iPad and Mac. Annual: Auto-renews yearly. Lifetime: One-time payment, no fees. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Caydo Art Design

Transform your photos into various art styles like digital oil paintings, diamond paintings, or hot bead sketches. This app provides a rich collection of picture materials to inspire your creative journey.

Highlights
  • Photo to digital oil painting
  • Photo to diamond painting
  • Photo to hot bead painting
  • Hand-drawn sketch conversion
  • Rich picture material library
  • One-click conversion
Features
Read full description

The gathering place of artists and creators, rich picture materials, choose any picture one-click conversion into digital oil painting, diamond painting, hot bead painting and other hand-drawn sketches, powerful creation assistant APP. Start Your Creative Journey Right Now!

Screenshots

Value Study4 screens
Caydo Art Design3 screens

Verdict

The call

The clearest difference is review sentiment: Value Study at 92% against Caydo Art Design's 0%. Value Study also leads on rating (4.8 vs 2.0) and ratings volume (3.3K vs 11). Caydo Art Design's advantage is in-app purchases (none vs 7). On price, update cadence, 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

Both are free to download. Value Study sells 7 in-app purchases, starting at $3.99 per year. Caydo Art Design asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Value Study holds the better App Store score, 4.8 against 2.0. That said, the two scores are not equally well evidenced: Value Study has 3.3K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 92% of Value Study's written reviews are positive against 0% of Caydo Art Design's.

UpkeepUpdate frequency

Value Study ships an update every 2 weeks, Caydo Art Design every 10 days. Both last shipped on October 12, 2026.

Scorecard5 real differences · 5 level
Value Study versus Caydo Art Design: the parameters behind the verdict, then further details
ParameterValue StudyCaydo Art Design
PriceFreeFree
Rating4.8 (3.3K ratings) — better2.0 (11 ratings)
Positive reviews92.0% of reviews — better0.0% of reviews
Number of ratings3.3K — better11
Update frequencyEvery 2 weeksEvery 10 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS16.615.0 — better
Further details — not scored
Size35 MB87 MB
Age rating4+4+
DeveloperDiem LimitedShenzhen Kaidu Network Technology Co., Ltd.

Customer experience

Value Study

All ratings3,304 ratings
Positive96.7%
Neutral1.3%
Negative2.0%
Written reviews200 reviews
Positive92.0%
Neutral1.5%
Negative6.5%

Caydo Art Design

All ratings11 ratings
Positive27.3%
Neutral0.0%
Negative72.7%
Written reviews6 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Value Study

Reported bugs

2 issues
  • App crashes or fails to launch on some devices
  • Occasional issues with image processing

Requested features

4 requests
  • Add ability to adjust value midpoint
  • Include color study/color adjustment options
  • Provide side-by-side comparison of original and simplified images
  • Add customizable grid overlay

Caydo Art Design

Not enough reviews yet to summarise bugs or requests.

In-app purchases

7 purchases

Value Study

Subscriptions2
  • Value Study Pro$3.991 Year
  • Value Study Pro (yearly)$6.991 Year
One-time5
  • Appreciation$2.99
  • Value Study Pro (Lifetime)$9.99
  • Generous boost$9.99
Show 2 more
  • Value Study$17.99
  • Amazing supporter$24.99
None

Caydo Art Design

No in-app purchases

Questions

Is Value Study free?
Value Study is free to download, with in-app purchases available.
Is Caydo Art Design free?
Caydo Art Design is free to download, with no in-app purchases.
Which has better reviews, Value Study or Caydo Art Design?
Value Study is rated higher. Value Study averages 4.8 out of 5 from 3.3K ratings, while Caydo Art Design averages 2.0 from 11 ratings.
Do Value Study or Caydo Art Design have ads?
Neither Value Study nor Caydo Art Design shows ads.
Which is updated more often, Value Study or Caydo Art Design?
Value Study ships an update every 2 weeks, and Caydo Art Design every 10 days. Most recently, Value Study was updated on October 12, 2026 and Caydo Art Design on October 12, 2026.

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