Comparison

Simplex Spelling HD vs Inference Clues

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

Head to head
About

Simplex Spelling HD

This app enhances English spelling and reading skills using a unique "reverse phonics" approach and contextually relevant spelling rules. It acts as a personal spelling coach, teaching foundational Dolch sight words through interactive word building and immediate feedback.

Highlights
  • Teaches Dolch Sight words
  • Reverse phonics approach
  • Contextual spelling rules
  • Interactive word building
  • Phonics hint feature
  • Letter-by-letter feedback
  • Multiple user accounts
Features
Read full description

Simplex Spelling improves English spelling and reading skills in a fun and interactive way by combining a unique “reverse phonics” approach with contextually relevant spelling rules that explain why words are spelled in a particular manner. It works like a personal spelling coach with every word. Simplex Spelling HD teaches the Dolch sight words to establish a base foundation in spelling and reading fluency. Please check out the word lists on our website before purchasing to ensure they meet your learning requirements https://pyxwise.com/sight-words-description/#Word-Lists Rather than using flash cards, Simplex Spelling enables the student to build each word. Students gain skills above and beyond the sheer memorization of words. Simplex Spelling is great tool to have for kids learning to spell and read, remedial students, or those learning English as a second language. Recommended for ages 5+. Note: You can not create your own spelling lists in Simplex Spelling HD. Features: - All of the more than 300 Dolch Sight words to help build literacy. - Words are spoken and used in a sentence to establish context. - Introduction seamlessly leads a student through the application’s features by providing spoken information while having the student spell new words. - Powerful phonics hint feature sounds out each word and provides a list of possible phonograms for each sound. - A full “reverse phonics” approach that includes sounds made by all the different letter combinations. - Contextually relevant spelling rule hints that help explain “how to spell” English words. - Unique letter by letter feedback system that provides immediate feedback. - Guaranteed success on every word. - Support for multiple user accounts. - User stats screen that allows you to see words that have been mastered and words that require further practice. - Export & email student progress reports. - Remembers each user’s position and progress. - Supports both upper and lower case letters. - Supports both alphabetic and QWERTY keyboard layouts. - Supports US, UK and Canadian English spelling. - An approach that appeals to audio, visual and tactile learners. Privacy Disclosure: - No 3rd party ads - Does not share any data - No In-App purchases - Contains child protected links in app to developer's website for additional information, support and teaching tips. - Contains child protected link to developer email support. COPPA Compliant 
https://pyxwise.com/privacy-policy/

About

Inference Clues

This app helps children develop reading comprehension by teaching them to identify inference clues. It offers a step-by-step, game-like learning experience with guided instruction and a reward system to keep young learners motivated.

Highlights
  • Builds inference skills step-by-step
  • Incremental learning with unlocked levels
  • Independent or therapist use
  • Guided learning for correct answers
  • Engaging Reward Center
  • Timers for fluency practice
  • Detailed reporting for up to 10 students
Features
Read full description

** Featured on FunEducationalApps.com & theAppyLadies.com ** Inference Clues helps build strong reading comprehension skills in a fun, game-like environment. As well as generating inferences, players identify the clue words that lead to an inference -- a vital comprehension skill and part of the Common Core standards. ***** 5 Stars! This is another great app from Happy Frog. I really like how your apps target a specific skill. ***** 5 Stars Just what my son needed. Thanks for your great apps. We are working our way through all of them! Inference Ace 2 is targeted to children in Grades 2-5 who can read the words (decode), but who need help with understanding what they read. Key Features: - Builds inference skills step-by-step until mastery. - Incremental learning. New levels are unlocked only when your child is ready. - Can be used independently (just hand it over, your child will know what to do) or with a therapist for reading intervention. - Guided learning for less frustration. Your child will always arrive at the correct answer. - Fun and engaging Reward Center to increase motivation. - Advanced levels include timers to ensure fluency. Research shows fluency in the foundation skills is critical to reading comprehension. - Detailed reporting for up to 10 students to meet the needs of teachers, therapists and parents. Inference Clues can be used at the same time as Inference Ace (our other inferencing app), or it can be used after Inference Ace has been completed. You can try this app by downloading the free version. The free version has 4 free levels for one player. You can purchase levels and players separately through in-app purchases. If you prefer no in-app purchases, please purchase the 'School Edition' of this app. 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. 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! 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.

Screenshots

Simplex Spelling HD4 screens
Inference Clues4 screens

Verdict

The call

The clearest difference is price: Simplex Spelling HD at $4.99 against Inference Clues's $7.99. Simplex Spelling HD also leads on review sentiment (90% vs 80%). Inference Clues's advantage is iOS requirement (12.2 vs 15.0). On rating, ratings volume, update cadence 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

Simplex Spelling HD costs $4.99 and Inference Clues $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 3.2 for Simplex Spelling HD against 3.3 for Inference Clues. Both are backed by a comparable volume of ratings — 5 and 6 respectively. Written reviews are what separate them: 90% of Simplex Spelling HD's written reviews are positive against 80% of Inference Clues's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 1, 2026 and September 19, 2026 respectively.

Scorecard3 real differences · 7 level
Simplex Spelling HD versus Inference Clues: the parameters behind the verdict, then further details
ParameterSimplex Spelling HDInference Clues
Price$4.99 — better$7.99
Rating3.2 (5 ratings)3.3 (6 ratings) — better
Positive reviews90.0% of reviews — better80.0% of reviews
Number of ratings56 — better
Update frequencyEvery 4 monthsEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.2 — better
Further details — not scored
Size162 MB24 MB
Age rating4+4+
DeveloperPyxwise Software Inc.Janine Toole

Customer experience

Simplex Spelling HD

All ratings5 ratings
Positive40.0%
Neutral40.0%
Negative20.0%
Written reviews30 reviews
Positive90.0%
Neutral3.3%
Negative6.7%

Inference Clues

All ratings6 ratings
Positive50.0%
Neutral16.7%
Negative33.3%
Written reviews15 reviews
Positive80.0%
Neutral6.7%
Negative13.3%

In-app purchases

None

Simplex Spelling HD

No in-app purchases

None

Inference Clues

No in-app purchases

Questions

Is Simplex Spelling HD free?
Simplex Spelling HD costs $4.99, with no in-app purchases.
Is Inference Clues free?
Inference Clues costs $7.99, with no in-app purchases.
Which has better reviews, Simplex Spelling HD or Inference Clues?
Inference Clues is rated higher. Simplex Spelling HD averages 3.2 out of 5 from 5 ratings, while Inference Clues averages 3.3 from 6 ratings.
Do Simplex Spelling HD or Inference Clues have ads?
Neither Simplex Spelling HD nor Inference Clues shows ads.
Which is updated more often, Simplex Spelling HD or Inference Clues?
Simplex Spelling HD ships an update every 4 months, and Inference Clues every 4 months. Most recently, Simplex Spelling HD was updated on October 1, 2026 and Inference Clues on September 19, 2026.

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