Comparison

Strong Mind Estimator vs Coloring Maker

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

Head to head
About

Strong Mind Estimator

Enhance your mental math, processing speed, and decision-making confidence with this clinical-grade brain training exercise. It focuses on numerical reasoning and approximation to improve daily judgment calls and cognitive shortcuts.

Highlights
  • Mental math and quick estimation
  • Processing speed enhancement
  • Decision-making confidence
  • Numerical reasoning
  • Cognitive training science
  • Progressive difficulty
Features
Read full description

A clinical-grade brain training exercise that develops mental estimation, processing speed, and the cognitive confidence behind faster decision-making. WHAT IT TRAINS • Mental math and quick estimation • Processing speed — the cognitive function that slows first with age • Decision-making confidence under time pressure • Numerical reasoning and approximation • Carryover skills for daily judgment calls WHY ESTIMATION MATTERS Mental estimation is the cognitive shortcut behind nearly every quick decision — should I leave now to make the appointment, can I afford this purchase, will this fit in the trunk, how long until I need to refill. When this skill slows down, daily life becomes more effortful even when no individual decision is hard. Estimation training is one of the most consistently responsive areas of cognitive training. Most users report subjective improvements within 2–4 weeks of consistent practice. WHO IT'S FOR • Adults 50+ wanting to maintain quick judgment • Concussion and TBI recovery • Professionals who make rapid decisions under pressure • Students preparing for timed assessments • Anyone who wants their inner calculator to work faster THE SCIENCE Strong Mind Estimator is built on the same three-pillar model — Attention, Intention, Rehearsal — that anchors Dr. Markus's broader work. The exercises are hierarchical, with progressive difficulty designed to push processing speed at the edge of current capacity. ABOUT THE DEVELOPER Dr. Donalee Markus has practiced cognitive restructuring since 1983 and is featured in Clark Elliott's "The Ghost in My Brain."

About

Coloring Maker

Transform photos into custom coloring books. Create outlines from images or draw your own, then color them with various tools. Save, share, and even create custom stamps for a personalized coloring experience.

Highlights
  • Create coloring books from photos
  • Draw custom outlines
  • Edit and fine-tune outlines
  • Color with various tools
  • Create custom stamps
  • Save and share creations
  • Child lock function
Features
Read full description

"Coloring Maker" is an app that allows you to create your own coloring book. Just take a picture of your favorite illustration with the camera, and you can immediately start coloring. ======================== Features of Coloring Maker ======================== * Simple coloring book app without subscription or membership registration * The feature is that you can make your own coloring book * Creating a coloring book is as easy as scanning images taken with a camera or downloaded. * You can give the coloring book made only with black lines to children and friends and have them play. * You can play by stamping on the coloring book * You can also make your own stamps. * You can save and share your coloring book ======================== Coloring Maker is recommended for these people! ======================== * I want to use a coloring book app that I can play immediately without subscribing or registering as a member * I want to play with my favorite picture as a coloring book * I want to enjoy coloring while talking with parents and children and friends * I want my child to color with the picture I drew * I want to concentrate on coloring without thinking * I want to make a line drawing of an illustration ======================== Coloring Maker Features ======================== [Creating a coloring book] * You can create outlines for coloring books from images taken with the camera or downloaded. * You can fine-tune the captured outline (adjust the density of the line and the strength of the transparency) * You can edit the captured outline (add with a pen, erase with an eraser) * You can create a coloring book by drawing the outline yourself, not from the image. * There are 50 levels of pen thickness that can be used for coloring books * Contours can be re-edited at any time * Can save images with outlines only (PNG format) * Up to 100 coloring books can be created (9 or more, advertisement viewing is required) * The coloring book can be deleted at any time [Coloring book play] * You can paint and decorate the coloring book you made with the following tools * Pen (100 colors, 5 levels of thickness) * Pattern (3x types, 5 levels of thickness) * Stamps (3 sizes, you can add your own) * You can save the completed coloring book image. * Share to SNS, email, etc. [Stamp making, play] * You can make a stamp that can be pressed from the top of the coloring book. * You can create stamps that can be used in [Coloring book play] in the same way as coloring books * You can import outlines from images even when creating stamps [Others] * There is a child lock function * Prevent children from accidentally deleting or sharing coloring books * BGM, sound can be turned ON/OFF * You can undo the coloring operation. * The screen can be enlarged/reduced when creating coloring books and playing. Terms of Use: https://mozkzki.github.io/apps/nurie_maker/terms_and_conditions/english Privacy Policy: https://mozkzki.github.io/apps/nurie_maker/privacy_policy/english

Screenshots

Coloring Maker4 screens

Verdict

The call

The clearest difference is price: Coloring Maker at Free against Strong Mind Estimator's $29.99. Coloring Maker also leads on rating (5.0 vs 1.0) and update cadence (weekly vs every 20 months). Strong Mind Estimator's advantage is ads (none vs shown) and iOS requirement (12.0 vs 15.6). On ratings volume 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

Coloring Maker is free to download; Strong Mind Estimator costs $29.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Coloring Maker holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

UpkeepUpdate frequency

Strong Mind Estimator ships an update every 20 months, Coloring Maker weekly. The most recent releases landed on October 10, 2026 and October 27, 2026 respectively.

Scorecard7 real differences · 3 level
Strong Mind Estimator versus Coloring Maker: the parameters behind the verdict, then further details
ParameterStrong Mind EstimatorColoring Maker
Price$29.99Free — better
Rating1.0 (1 ratings)5.0 (2 ratings) — better
Positive reviews0.0% of reviews—
Number of ratings12 — better
Update frequencyEvery 20 monthsWeekly — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidAd-supported — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS12.0 — better15.6
Further details — not scored
Size169 MB230 MB
Age rating4+4+
DeveloperDonalee MarkusYutaka Kato

Customer experience

Strong Mind Estimator

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Coloring Maker

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Strong Mind Estimator

No in-app purchases

None

Coloring Maker

No in-app purchases

Questions

Is Strong Mind Estimator free?
Strong Mind Estimator costs $29.99, with no in-app purchases.
Is Coloring Maker free?
Coloring Maker is free to download, with no in-app purchases.
Which has better reviews, Strong Mind Estimator or Coloring Maker?
Coloring Maker is rated higher. Strong Mind Estimator averages 1.0 out of 5 from 1 ratings, while Coloring Maker averages 5.0 from 2 ratings.
Do Strong Mind Estimator or Coloring Maker have ads?
Coloring Maker shows ads; Strong Mind Estimator does not.
Which is updated more often, Strong Mind Estimator or Coloring Maker?
Strong Mind Estimator ships an update every 20 months, and Coloring Maker weekly. Most recently, Strong Mind Estimator was updated on October 10, 2026 and Coloring Maker on October 27, 2026.

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