Comparison

Book Builder vs Grade 9 Math Mastery

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

Head to head
About

Book Builder

Empower children to become authors by creating their own digital books. This app provides characters, backgrounds, and text tools to help kids craft unique stories. Finished books can be read digitally or printed at home, fostering creativity and learning.

Highlights
  • Create custom storybooks
  • Add text with easy-to-use options
  • Use provided characters and backgrounds
  • Incorporate personal photos
  • Read books digitally
  • Print books at home
Features
Read full description

Become an author! Puppet Pals Book Builder empowers a child to create beautiful creative content. Characters and backgrounds are provided. Even add your own photos! Get started by adding text with many easy-to-use options. When you're done creating, read your book or print it out at home! Encourage life long learning and creativity!

About

Grade 9 Math Mastery

Features
Read full description

Grade 9 Math Mastery prepares Ontario students for the province-wide Grade 9 mathematics assessment. It teaches each concept first, then gives 400 practice questions to prove it stuck. Most study apps only test. This one teaches. Learn the concept • 25 guided lessons, one for every topic on the course • Worked examples that reveal one step at a time, so students can attempt the next line before seeing it • Each lesson names the mistakes students actually make, and why they happen • A short check at the end confirms the idea landed Practise until it sticks • 400 questions across all five strands: Number, Algebra, Data, Geometry and Measurement, and Financial Literacy • Difficulty adapts to the student and moves up as they improve • Wrong answers come back automatically on a spaced repetition schedule, timed for just before they would be forgotten • A mistake journal collects everything missed, with step-by-step solutions • A 57-formula reference sheet, plus a quiz mode for memorising it Practise under real conditions • Mini and full mock tests, timed • A full exam simulation: 25 questions, 75 minutes, no hints, with a complete review afterwards • An estimated achievement level after every attempt Keep them coming back • Speed Drill, Survival, Race Mode, and a two-player duel on one device • A new challenge question every day • Streaks, daily goals and 21 achievements See exactly where they stand • Mastery across all 25 topics at a glance • A predicted achievement level, and the specific topics holding it back • Weekly progress reports and an exam-readiness checklist • A parent view, plus a progress summary you can share or email For parents Everything is built around one question: what should they work on next? The app answers it on every screen, names the topics that need attention, and links straight to the lesson that teaches them. You do not need to remember Grade 9 math to help. Free and Premium Algebra is free, with 15 practice questions a day and one mini mock test. Premium unlocks all five strands, every guided lesson, unlimited daily practice, full mock exams and the exam simulation, and parent reports. Works on iPhone and iPad. Premium starts with a 7-day free trial. Cancel any time. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Payment is charged to your Apple Account. Manage or cancel in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Service: https://eager.app/terms Privacy Policy: https://eager.app/privacy

Screenshots

Book Builder4 screens
Grade 9 Math Mastery4 screens

Verdict

The call

The clearest difference is price: Grade 9 Math Mastery at Free against Book Builder's $7.99. Book Builder's advantage is in-app purchases (none vs 2) and update cadence (every 5 weeks vs every 5 months). On ads, device support and iOS requirement 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

Grade 9 Math Mastery is free to download; Book Builder costs $7.99 up front. Grade 9 Math Mastery sells 2 in-app purchases, starting at $4.99 per month. Book Builder asks for nothing beyond the download.

UpkeepUpdate frequency

Book Builder ships an update every 5 weeks, Grade 9 Math Mastery every 5 months. The most recent releases landed on August 21, 2026 and September 10, 2026 respectively.

Scorecard3 real differences · 7 level
Book Builder versus Grade 9 Math Mastery: the parameters behind the verdict, then further details
ParameterBook BuilderGrade 9 Math Mastery
Price$7.99Free — better
Rating4.8 (13 ratings) — better—
Positive reviews87.5% of reviews—
Number of ratings13 — better—
Update frequencyEvery 5 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size173 MB7 MB
Age rating4+4+
DeveloperPolished Play, LLCEager.app

In-app purchases

None

Book Builder

No in-app purchases

2 purchases

Grade 9 Math Mastery

Subscriptions2
  • Grade 9 Math Mastery — Monthly$4.991 Month
  • Grade 9 Math Mastery — Annual$29.991 Year

Questions

Is Book Builder free?
Book Builder costs $7.99, with no in-app purchases.
Is Grade 9 Math Mastery free?
Grade 9 Math Mastery is free to download, with in-app purchases available.
Do Book Builder or Grade 9 Math Mastery have ads?
Neither Book Builder nor Grade 9 Math Mastery shows ads.
Which is updated more often, Book Builder or Grade 9 Math Mastery?
Book Builder ships an update every 5 weeks, and Grade 9 Math Mastery every 5 months. Most recently, Book Builder was updated on August 21, 2026 and Grade 9 Math Mastery on September 10, 2026.

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