Comparison

Inference Ace vs Sort By Kind

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

Head to head
About

Inference Ace

This app helps children in grades 2-5 improve their reading comprehension by teaching inference skills step-by-step. It uses a game-like environment with over 450 examples and a reward center to keep kids engaged. Detailed reporting is available for up to 10 students.

Highlights
  • Step-by-step inference skill building
  • Game-like environment with reward center
  • Over 450 examples designed by teachers
  • Detailed reporting for multiple students
  • Incremental learning with unlocked levels
  • Guided learning for reduced frustration
Features
Read full description

** Winner of prestigious Mom's Choice Award! Featured on Appolicious.com, iHeartThisApp.com ** Inference Ace helps kids who have trouble with reading comprehension. The app builds inference skills step-by-step until mastery in a fun, game-like environment. ***** 5 Stars - Nice app for practicing inference. Tons of examples. ***** 5 Stars - My son struggles with comprehension and doesn't like reading long passages. This app teaches a high level of skill in a format he enjoys. Thanks! Inference Ace is targeted to children in Grades 2-5 who can read the words (decode), but don't understand what they read. With over 450 examples, a fun and engaging reward center to increase motivation, and content designed by professional teachers and researchers, this app is bound to capture the attention of your kids. Best of all, there is detailed reporting for up to 10 students to meet the needs of teachers, therapists and parents. Key Features: - Incremental learning. New levels are unlocked only when your child is ready. - Guided learning for less frustration. Your child will always be guided to the correct answer. - Fun and engaging Reward Center to increase motivation. - Contains over 450 examples, with content designed by professional teachers and researchers. - Inferences are taught from multiple perspectives: what inferences are possible, which are not possible, multiple inferences per sentence, etc. - Our own Smart Sentence technology is used to infinitely vary the examples to prevent learning by rote. - Advanced levels include timers to ensure fluency. Research shows fluency in the foundation skills is critical to reading comprehension. Our apps are designed for and tested by typical and special needs children. Testers include children with Autism and other special needs. Our apps work for them! The free version of this app has 4 free levels for a single player. Remaining levels are unlocked by a single in-app purchase. Additional players can be purchased separately through an in-app purchase. Check out 'Inference Ace School Edition' if you prefer no in-app purchases. We are a member of the Moms with Apps program. We collect NO private information in our app, and our apps do not allow unrestricted web access. Inferencing is a key component of reading comprehension. If you can't infer fluently, you can't understand the story. Help your child now by getting started with our Inference Ace app. While you're at it, check out our other apps that target WH questions, identifying inference clues and identifying the main idea of a sentence or paragraph. We take customer service very seriously! If you ever have a problem or find that we've missed something, contact us at our website and we will do our best to fix the problem. ** Note: Inference Ace and Inference Clues intentionally use similar data sets. However, different skills are targeted. Also, when working through this app, you will encounter different variants of the same examples many times as we teach our players to derive multiple inferences from a single sentence -- just like expert readers do. This is an intentional feature, not a bug :-)

About

Sort By Kind

This educational app helps children aged 2 and up develop visual perception, cognitive, and language skills through fun sorting activities. It offers a simple, distraction-free learning environment designed to enhance critical thinking and problem-solving abilities.

Highlights
  • Visual item sorting activities
  • Develops visual perception
  • Enhances cognitive skills
  • Improves language skills
  • Progress tracking for educators
  • Accessibility features for users with disabilities
Features
Read full description

- Full version. - No in-app purchases. - No ads. - Safe for kids. Welcome to “Sort By Kind”. This educational app is designed for children aged 2 and above. Here children can learn to sort visually related items. It is fun, and it helps them develop visual perception skills, cognitive skills, and language skills. STEP BY STEP is a professional EdTech studio that focuses on developing educational apps for children aged 1 to 5 years old. During these critical years, children enter a new learning stage every few months. Our apps support and strengthen the development of crucial skills for each learning stage. This way we guide your children, step by step, throughout this entire age range. Our key values are perfection and simplicity. We believe that small details make a big difference, so we give great attention to every detail — both in content and design. Most importantly, we keep our apps simple — simple to understand and simple to use. While playing our games, children will engage in simple activities, such as matching, pairing, ordering, grouping, and sorting. This allows them to practice essential skills, such as: categorization, conceptualization, generalization, abstraction, memory, language, math, visual perception, fine motor, accuracy, attention, and focus. They will learn about shapes, colors, animals, fruit, vegetables, clothing, tools, vehicles, furniture, professions, toys, etc., — all while playing. The levels are generally arranged by difficulty. The first levels are usually quite simple — their main objective is to teach players critical thinking and problem solving. However, the exercises become increasingly challenging as the child advances within the game. Our applications avoid distractions such as popups, unnecessary animation, and noisy feedback. We keep our applications safe for children — no advertisements, no unsafe links to external content, no popups, etc. Furthermore, our experience indicates that our apps can be very helpful for children with special-needs¹, and that they can function as useful tools in both speech-language therapy² and in occupational therapy³. In addition, our apps have been found useful for adults with disabilities or dementia⁴. For this reason, we added two important features: the first one was designed for teachers, therapists, and speech pathologists, which allows them to track the progress of their students; the second feature makes our apps also accessible for users with disabilities, and on this matter we would like to thank the Technology Consulting Center at “Beit Issie Shapiro”⁵ for their professional guidance and consultation regarding accessibility. ________ ¹ Special needs - Learning difficulties due to learning disabilities, communication disabilities, emotional or behavioural disorders, physical disabilities and/or developmental disabilities, which may be caused by Autism (Autistic Spectrum Disorders), Down Syndrome, Dyslexia, Tourette Syndrome, etc. ² Speech-language therapy - Treatment of communication disorders by speech-language pathologists (SLP). ³ Occupational therapy (OT) - Treatment meant to develop, recover, or maintain daily living and work skills for people with a physical, mental or developmental condition. ⁴ Dementia -  A condition caused by brain injury (BI), brain damage or brain diseases, such as Alzheimer’s, Lewy bodies (DLB), Vascular dementia, etc. ⁵ "Beit Issie Shapiro" is a leading non-profit organization that develops therapies for people with disabilities, and also acts as a ‘Special Consultant’ to the United Nations.

Screenshots

Inference Ace4 screens

Verdict

The call

The clearest difference is rating: Sort By Kind at 4.4 against Inference Ace's 3.5. Sort By Kind also leads on in-app purchases (none vs 3) and update cadence (every 2 months vs every 7 months). Inference Ace's advantage is review sentiment (89% vs 75%) and device support (3 vs 1). On price and ads 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. Inference Ace sells 3 one-off in-app purchases. Sort By Kind asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sort By Kind holds the better App Store score, 4.4 against 3.5. Both are backed by a comparable volume of ratings — 22 and 7 respectively. Written reviews complicate that: 89% of Inference Ace's written reviews are positive against 75% of Sort By Kind's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Inference Ace ships an update every 7 months, Sort By Kind every 2 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

Scorecard8 real differences · 2 level
Inference Ace versus Sort By Kind: the parameters behind the verdict, then further details
ParameterInference AceSort By Kind
PriceFreeFree
Rating3.5 (22 ratings)4.4 (7 ratings) — better
Positive reviews88.6% of reviews — better75.0% of reviews
Number of ratings22 — better7
Update frequencyEvery 7 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS12.27.0 — better
Further details — not scored
Size22 MB77 MB
Age rating4+4+
DeveloperJanine TooleSTEP BY STEP

Customer experience

Inference Ace

All ratings21 ratings
Positive66.7%
Neutral4.8%
Negative28.6%
Written reviews35 reviews
Positive88.6%
Neutral5.7%
Negative5.7%

Sort By Kind

All ratings6 ratings
Positive83.3%
Neutral16.7%
Negative0.0%
Written reviews4 reviews
Positive75.0%
Neutral25.0%
Negative0.0%

In-app purchases

3 purchases

Inference Ace

One-time3
  • Upgrade to 2 Players$1.99
  • Inference Ace: Buy All Levels$2.99
  • Upgrade to 10 Players$2.99
None

Sort By Kind

No in-app purchases

Questions

Is Inference Ace free?
Inference Ace is free to download, with in-app purchases available.
Is Sort By Kind free?
Sort By Kind is free to download, with no in-app purchases.
Which has better reviews, Inference Ace or Sort By Kind?
Sort By Kind is rated higher. Inference Ace averages 3.5 out of 5 from 22 ratings, while Sort By Kind averages 4.4 from 7 ratings.
Do Inference Ace or Sort By Kind have ads?
Neither Inference Ace nor Sort By Kind shows ads.
Which is updated more often, Inference Ace or Sort By Kind?
Inference Ace ships an update every 7 months, and Sort By Kind every 2 months. Most recently, Inference Ace was updated on November 6, 2026 and Sort By Kind on November 2, 2026.

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