Comparison

Mermaid Maths vs ReadBuddy.ai

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

Head to head
About

Mermaid Maths

This educational game helps children practice addition skills in a fun, underwater environment. Players earn treasure by solving math problems, which can then be used to customize their underwater world with new friends and backgrounds.

Highlights
  • Addition practice
  • Earn treasure rewards
  • Customize underwater scenes
  • Unlock new friends
  • Multiple backgrounds
  • Interactive gameplay
Features
Read full description

Mermaid Maths allows kids to practice addition while earning treasure they can use to swim with different friends under the sea! The maths exercise is at the top of the game scene, once you know the answer tap the bubble that contains it and the mermaid will swim to it. If you get it correct you gain 1 treasure. An incorrect answer will lose one treasure. Use treasure to change to one of eight different backgrounds, choose between 2 mermaids and also add up to 6 different friends to your maths practice!

About

ReadBuddy.ai

This AI-powered companion helps children understand any book they read by asking age-appropriate questions. It fosters comprehension, confidence, and critical thinking, allowing parents to track progress. Works with any physical or digital book.

Highlights
  • AI-powered reading comprehension
  • Works with any book
  • Age-appropriate questions
  • Parental progress tracking
  • Builds confidence and curiosity
  • No personal data collected
Features
Read full description

ReadBuddy is an AI-powered reading companion for children (grades K–5) and their parents. It works with any book your child reads — picture books, graphic novels, or chapter books — and turns every book into comprehension practice, a daily reading habit, and clear progress you can see. SCAN ANY BOOK. QUIZ IN SECONDS. Your child scans a book cover and gets thoughtful, age-appropriate comprehension questions on the spot. 1,500+ popular titles already have curated questions — and it works with any book, no limited library. DAILY RECAP: EVERY QUIZ, FOLLOWED UP The questions your child missed don't just disappear. Every finished book comes back as bite-size follow-up practice — a think-about-it question, a read-it-out-loud passage, and the vocabulary words to master. READ ALOUD & READING SPEED Kids read a short passage out loud and watch their words appear live as they speak. ReadBuddy measures reading speed (WCPM) and tracks fluency over time. Audio is analyzed in the moment, then deleted — never stored or shared. WEEKLY MISSION, STREAKS & REMINDERS Set a weekly reading goal together and track it day by day. If your reader falls behind, a friendly push or email nudge brings them back on track. MADE FOR PARENTS, TOO - Sunday Parent Report — a weekly email recap of books, quizzes, reading speed, and skills to encourage next - Growth tab — trends across books, speed, accuracy, and expression - "For Parents" notes after every quiz: what your child understood, and what to talk about next WHY FAMILIES TRUST READBUDDY - Works with any book — no limited library - Builds comprehension and fluency, not just page counts - No personal or biometric data collected from children - Audio recordings never stored ReadBuddy helps young readers build confidence, curiosity, and critical thinking — ten minutes at a time. Download free and turn tonight's book into a reading habit.

Screenshots

Mermaid Maths4 screens
ReadBuddy.ai4 screens

Verdict

The call

The clearest difference is in-app purchases: Mermaid Maths at none against ReadBuddy.ai's 4. Mermaid Maths also leads on iOS requirement (15.6 vs 17.0). ReadBuddy.ai's advantage is update cadence (monthly vs every 58 months) and ratings volume (9 vs 1). On price, rating, 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. ReadBuddy.ai sells 4 in-app purchases, starting at $4.99 per month. Mermaid Maths asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Mermaid Maths against 5.0 for ReadBuddy.ai. That said, the two scores are not equally well evidenced: ReadBuddy.ai has 9 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Mermaid Maths ships an update every 58 months, ReadBuddy.ai monthly. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
Mermaid Maths versus ReadBuddy.ai: the parameters behind the verdict, then further details
ParameterMermaid MathsReadBuddy.ai
PriceFreeFree
Rating5.0 (1 ratings)5.0 (9 ratings)
Positive reviews—100.0% of reviews
Number of ratings19 — better
Update frequencyEvery 58 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.6 — better17.0
Further details — not scored
Size39 MB78 MB
Age rating4+4+
DeveloperL&L Programming LLCWei Si

Customer experience

Mermaid Maths

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

ReadBuddy.ai

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Mermaid Maths

No in-app purchases

4 purchases

ReadBuddy.ai

Subscriptions4
  • ReadBuddy Basic Monthly1 Month trial$4.991 Month
  • ReadBuddy Family Monthly1 Month trial$8.991 Month
  • ReadBuddy Basic Yearly1 Month trial$49.991 Year
Show 1 more
  • ReadBuddy Family Yearly1 Month trial$89.991 Year

Questions

Is Mermaid Maths free?
Mermaid Maths is free to download, with no in-app purchases.
Is ReadBuddy.ai free?
ReadBuddy.ai is free to download, with in-app purchases available.
Which has better reviews, Mermaid Maths or ReadBuddy.ai?
Mermaid Maths and ReadBuddy.ai are both rated 5.0 out of 5 on the App Store, from 1 and 9 ratings respectively.
Do Mermaid Maths or ReadBuddy.ai have ads?
Neither Mermaid Maths nor ReadBuddy.ai shows ads.
Which is updated more often, Mermaid Maths or ReadBuddy.ai?
Mermaid Maths ships an update every 58 months, and ReadBuddy.ai monthly. Most recently, Mermaid Maths was updated on October 13, 2026 and ReadBuddy.ai on October 24, 2026.

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