Comparison

Vocabulary Builder by Learning vs Rusty

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

Head to head
About

Vocabulary Builder by Learning

Enhance your English vocabulary with daily words, definitions, and usage examples. Access over 20,000 words across various categories, set personalized learning goals, and test your knowledge with interactive quizzes. Features include home screen widgets and shareable flashcards for convenient learning.

Highlights
  • Daily Word of the Day
  • 20,000+ Word Library
  • Personalized Learning & Goals
  • Interactive Quizzes
  • Widgets & Reminders
  • Shareable Flashcards
Features
Read full description

Meet Vocabulary Builder by Learning, your daily companion for English word mastery. Perfect for busy professionals, motivated students, and lifelong learners, this app helps you learn the vocabulary you need to stand out and succeed. Why choose Vocabulary Builder by Learning? - Daily Word of the Day Discover a fresh word each morning—complete with definitions, synonyms, and real-life usage. Perfect for quick vocabulary boosts. - 20,000+ Word Library From business, marketing, finance, and technology to SAT and GRE word lists, we offer curated collections for every goal. Whether you’re aiming for career growth or academic success, you’ll find the right words here. - Personalized Learning & Goals Set up custom daily goals and let our reminders keep you on track. Our app caters to your interests—choose from 40+ categories like management, health, culture, and personal development to shape your learning path. - Interactive Quizzes & Vocab Score Assess your knowledge with adaptive quizzes that challenge your current level. Watch your vocab score rise as you master essential words. Great for native speakers who want to refine advanced English or for exam prep. - Motivating Learning Plans & Games Pick a category, set your plan, and start learning. Learning Plans guide you step by step so new words become part of your vocabulary. - Widgets & Reminders for Busy Schedules Short on time? Our home screen widget serves bite-sized word updates throughout the day. Even if you’re juggling a hectic routine, you can still learn new words easily. - Shareable Flashcards Make learning social by creating and sharing flashcards or quizzes with friends and colleagues. Turn vocabulary building into a fun group activity! - Privacy & Security All data is stored locally. We never share your information. Learn with peace of mind. Who Will Benefit? - Professionals Impress clients, colleagues, and hiring managers by speaking with clarity and precision. - Students Conquer the SAT, GRE, or any standardized test with targeted vocab lists that help boost test scores. - Lifelong Learners Expand your vocabulary just for the joy of it, or dive into specialized topics like innovation, economics, or literature. - English Enthusiasts Sharpen your command of the language with advanced words, idioms, and expressions. Backed by Research & Expert Insights - Harvard Business Review HBR shows professionals with stronger vocabulary often earn more and communicate clearly. - Educational Testing Service Studies from ETS link strong vocabulary to higher GPAs and better exam performance. - U.S. Department of Defense US DOD findings indicate that improved verbal skills can add up to $10,000 to annual income. - American Psychological Association APA highlights how broader word knowledge reduces mental load, improving creativity and problem-solving. With Vocabulary Builder by Learning, you’ll discover: - Confidence in meetings, interviews, and social settings. - Deeper comprehension of challenging books, articles, and discussions. - Continuous inspiration as you meet daily learning targets and watch your vocabulary flourish. Ready to Start? Give Vocabulary Builder by Learning a try today and turn your “What if” into real results. Whether you’re aiming for career growth, academic success, or sharper conversations, it all begins with that first new word. See how quickly your communication can evolve! Terms of Use: https://learnvocabulary.io/terms-of-service/ Privacy Policy: https://learnvocabulary.io/privacy-policy/

About

Rusty

This app strengthens cognitive skills like mental math, articulation, and critical thinking through daily AI-powered training. It focuses on improving how you think, solve problems, and communicate, rather than just memorization. Track your progress and build mental sharpness for the AI age.

Highlights
  • Mental Math training
  • AI-powered articulation feedback
  • Verbal fluency exercises
  • Critical thinking challenges
  • Focus and concentration training
  • Problem-solving activities
  • Progress tracking and benchmarks
Features
Read full description

Build a reading and math practice routine with Rusty, a voice-first AI learning companion for families with learners ages 4-12. Short guided lessons pair spoken prompts with hands-on activities. Practice foundational skills, ask questions out loud, and give parents a clearer view of completed learning. READING, PHONICS AND WORD PLAY Practice letter sounds, sight words, word building, vocabulary, shared reading, sequencing and retelling. Read-aloud activities offer conservative feedback; Rusty does not claim to grade pronunciation or diagnose a reading level. MATH YOU CAN SEE AND TRY Explore counting, number paths, addition, subtraction, make-ten strategies, place value, patterns, arrays and groups through visual, tappable activities. GUIDED VOICE LEARNING Hear a prompt, try an answer, use a hint and take the next step. Rusty combines voice guidance with activity-based practice. Live voice requires an internet connection and parent setup. Activity-only practice remains available when voice time runs out. PARENTS STAY INVOLVED Adults create the account and manage learner profiles, goals, preferences and voice access. Parent controls and progress summaries help families follow practice grounded in completed activities. Children do not create their own accounts. START WITH FREE PRACTICE A parent account is required. Free includes one learner and a limited weekly voice allowance. Optional Premium and Family subscriptions provide additional voice access; Family supports up to four learner profiles. Current prices, allowances and renewal terms are shown in the app before purchase. CLEAR DATA BOUNDARIES Live voice lessons require the applicable parent notices and consent. Voice is processed to deliver the lesson. Rusty does not store raw lesson audio or full conversation transcripts. See the Privacy Policy for details on data use, parent controls and deletion. Rusty's current library covers a focused set of foundational reading and math skills, not a full curriculum for every age. Rusty is a practice companion, not a school, diagnostic assessment, or replacement for a teacher or specialist. Privacy Policy: https://www.userusty.com/privacy Terms of Use: https://www.userusty.com/terms Support: https://www.userusty.com/contact

Screenshots

Vocabulary Builder by Learning4 screens
Rusty4 screens

Verdict

The call

The clearest difference is ads: Vocabulary Builder by Learning at none against Rusty's shown. Vocabulary Builder by Learning also leads on ratings volume (551 vs 4). Rusty's advantage is review sentiment (100% vs 68%) and rating (5.0 vs 4.7). On price, update cadence, in-app purchases and monetization model 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. Vocabulary Builder by Learning sells 11 in-app purchases, starting at $2.99 per 7 days and Rusty sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Rusty holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Vocabulary Builder by Learning has 551 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 68% of Vocabulary Builder by Learning's written reviews are positive against 100% of Rusty's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

Scorecard4 real differences · 6 level
Vocabulary Builder by Learning versus Rusty: the parameters behind the verdict, then further details
ParameterVocabulary Builder by LearningRusty
PriceFreeFree
Rating4.7 (551 ratings)5.0 (4 ratings) — better
Positive reviews67.9% of reviews100.0% of reviews — better
Number of ratings551 — better4
Update frequencyWeeklyWeekly
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS17.0 — better18.0
Further details — not scored
Size76 MB266 MB
Age rating4+4+
DeveloperLearning Learn LLCFOUR STAR GROUP INC

Customer experience

Vocabulary Builder by Learning

All ratings551 ratings
Positive93.3%
Neutral4.2%
Negative2.5%
Written reviews28 reviews
Positive67.9%
Neutral10.7%
Negative21.4%

Rusty

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

11 purchases

Vocabulary Builder by Learning

Subscriptions9
  • Premium Learning Weekly$2.997 Days
  • Premium Learning Monthly$4.991 Month
  • Vocabulary Monthly Subscription$7.991 Month
Show 6 more
  • Premium Learning Weekly3 Days trial$12.997 Days
  • Learn Vocabulary Premium Value$19.991 Year
  • Annual Subscription 50% Discount1 Year trial$24.991 Year
  • Premium Learning Annual3 Days trial$24.991 Year
  • Vocabulary Annual Discount1 Year trial$34.991 Year
  • Vocabulary Annual Subscription3 Days trial$34.991 Year
One-time2
  • Premium Learning Lifetime$59.99
  • Vocabulary Lifetime Subscription$89.99
2 purchases

Rusty

Subscriptions2
  • Rusty Premium3 Days trial$6.991 Month
  • Rusty Premium3 Days trial$39.991 Year

Questions

Is Vocabulary Builder by Learning free?
Vocabulary Builder by Learning is free to download, with in-app purchases available.
Is Rusty free?
Rusty is free to download, with in-app purchases available.
Which has better reviews, Vocabulary Builder by Learning or Rusty?
Rusty is rated higher. Vocabulary Builder by Learning averages 4.7 out of 5 from 551 ratings, while Rusty averages 5.0 from 4 ratings.
Do Vocabulary Builder by Learning or Rusty have ads?
Rusty shows ads; Vocabulary Builder by Learning does not.
Which is updated more often, Vocabulary Builder by Learning or Rusty?
Vocabulary Builder by Learning ships an update weekly, and Rusty weekly. Most recently, Vocabulary Builder by Learning was updated on October 15, 2026 and Rusty on October 1, 2026.

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