Comparison

Recursio vs Expression Builder

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

Head to head
About

Recursio

This app helps English learners retain vocabulary, phrases, and grammar through personalized practice. It focuses on active recall and adaptive review, allowing users to build custom learning spaces and receive AI-powered feedback on speaking and writing.

Highlights
  • Personalized vocabulary and phrase building
  • Adaptive recall for weak spots
  • AI-powered grammar and speaking practice
  • Structured grammar topic study
  • Customizable vocabulary spaces
  • Sentence clarity and grammar feedback
Features
Read full description

Recursio helps English and Spanish learners stop forgetting the words, phrases, verbs, and grammar they already study. Build your own vocabulary, practice what matters to you, and let Recursio bring weak spots back into review. You choose what to learn: words, phrases, verbs, grammar, sentences, speaking, Coach sessions. Or let Daily Five choose for you. NEW: Daily Five One short routine every day: review a few of your words, three verb tasks, and one sentence. Keep your streak, with one free skip a week. Five minutes is enough. NEW: Verb Trainer Practice verbs in every tense and mood, always inside a complete sentence: 338 English verbs across 7 tenses, 356 Spanish verbs across 8 tenses. Learn in the language you learn Choose English or Spanish as your learning language. Spanish comes with a 3,400-word dictionary with simple Spanish definitions, 100 grammar topics from A1 to B2, 300 everyday phrases, and a Coach that talks to you in Spanish, including real-life scenes like ordering at a restaurant. The app interface is available in English and Spanish. Recursio is for learners who already have a basic level. Definitions, examples, explanations, and prompts are shown in the language you learn, so you stay inside it instead of translating. Main features: • Personal vocabulary Add words and phrases you want to remember, including ones outside the built-in dictionary. • Phrases Save phrasal verbs, collocations, idioms, and conversational chunks, and practice them alongside your words. • Vocabulary Spaces Organize words and phrases by topic or goal. Pro users can create multiple spaces: Work, Travel, Exams, My mistakes. • Word & Phrase Practice Review active items through dictation, sentence building, speaking transcript practice, writing scaffold, and mixed review. • Premium Cloud Voices Pro users can hear premium cloud-generated voices for Dictation and Speaking Practice. • Grammar topics Study structured grammar topics with short explanations, examples, common mistakes, and built-in practice. Spanish now covers A1 to B2. • AI Grammar Practice one grammar topic more deeply with fresh guided exercises and short explanations. • Sentence Check Write sentences with target words or phrases and get feedback on clarity, grammar, naturalness, and task fit. • AI Speaking Practice Read aloud, compare what the app recognized with the target sentence, and practice focused phrase drills based on your result. Forgiving by default; choose a stricter mode in Settings. • Coach Thematic chats and focused drills in the language you learn; weak grammar and vocabulary go back into review. • Progress insights Pro users can see weak items, practice rhythm, recall load, and recommended next steps. • Adaptive recall Recursio tracks confidence, mistakes, and resurfacing signals so important weak spots return at the right time. • iPhone and iPad A layout made for both, in portrait and landscape. Free plan includes core vocabulary tools for words and phrases, one vocabulary space, built-in practice, Daily Five, Verb Trainer, basic dictation voice, and grammar topic practice. SMART unlocks premium AI practice, Coach access, a Coach mini-chat inside Daily Five, expanded capacity, and deeper guided practice for vocabulary, grammar, and writing. PRO unlocks Premium Cloud Voices, AI Speaking Practice, Progress insights, Vocabulary Spaces, higher daily AI limits, and the full premium learning layer. Recursio is not a flashcard deck, not a fixed beginner course, and not a generic chatbot. It is a focused language practice system for remembering more, writing better, and returning to the words, phrases, verbs, and grammar that still need work. Terms of Use: https://recursiolearn.com/terms/ Privacy Policy: https://recursiolearn.com/privacy/ Support: https://recursiolearn.com/support/ support@recursiolearn.com

About

Expression Builder

Features
Read full description

Speak English Naturally. Master the Expressions Native Speakers Use Every Day. You may know thousands of English words already. Yet movies still feel too fast, conversations sound confusing, and many common expressions don't mean what their individual words suggest. That's because real English is built on more than vocabulary. Expression Builder: First 3000 helps you master the most important English expressions by focusing on the three building blocks of natural communication: 1000 Phrasal Verbs 1000 Collocations 1000 Idioms Together, these 3000 carefully selected expressions help bridge the gap between textbook English and real-world English. Why Expression Builder? Understand English the Way Native Speakers Use It Native speakers don't simply combine individual words. They rely on thousands of fixed expressions and natural word combinations. Without them, even advanced learners often struggle to understand: Movies and TV shows Podcasts and YouTube videos News articles and blogs Workplace conversations Everyday social interactions Expression Builder focuses on the expressions you are most likely to encounter in real life. Learn More Than Just Definitions Every expression includes rich learning content designed for long-term retention: Clear Meanings Simple, easy-to-understand explanations. High-Quality Images Visual learning helps expressions become memorable and intuitive. Example Sentences See how expressions are used naturally in modern English. Synonyms and Related Expressions Expand your active vocabulary and improve fluency. Opposites and Contrasts Understand subtle differences and avoid common mistakes. Natural Pronunciation Listen and practice authentic pronunciation. Learn Faster with Flashcards Our streamlined flashcard system keeps learning focused and efficient. Simply swipe expressions into: Learning Known No complicated setup. No distractions. Just consistent progress. Designed for Real Fluency Many learners reach a point where vocabulary alone is no longer enough. You know the words. Now learn the expressions. Mastering phrasal verbs, collocations, and idioms is one of the fastest ways to sound more natural, understand more content, and communicate with greater confidence. Built for Learners Worldwide Meanings in 30+ languages Beginner-friendly explanations Fast and intuitive interface Thousands of carefully selected expressions Optimized for daily study What This App Is (And Isn't) This isn't a grammar course. This isn't a collection of rare academic expressions. This isn't another endless word list. Expression Builder is focused on one goal: Helping you understand and use the expressions that make English sound natural. Download Expression Builder: First 3000 today and start speaking English the way it is actually used. Privacy Policy: https://www.wordsensemaster.com/privacy_policy.html Terms of Use: https://www.wordsensemaster.com/terms_of_use.html

Screenshots

Recursio4 screens
Expression Builder4 screens

Verdict

The call

The clearest difference is in-app purchases: Expression Builder at none against Recursio's 4. Recursio's advantage is ads (none vs shown). On price, update cadence, 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

Both are free to download. Recursio sells 4 in-app purchases, starting at $3.99 per month. Expression Builder asks for nothing beyond the download.

UpkeepUpdate frequency

Recursio ships an update fortnightly, Expression Builder every 4 weeks. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

Scorecard2 real differences · 8 level
Recursio versus Expression Builder: the parameters behind the verdict, then further details
ParameterRecursioExpression Builder
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyFortnightly — betterEvery 4 weeks
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.515.0 — better
Further details — not scored
Size71 MB114 MB
Age rating12+4+
DeveloperAlex NaumovNezihe Sozen

In-app purchases

4 purchases

Recursio

Subscriptions4
  • Recursio Smart Monthly$3.991 Month
  • Recursio Pro Monthly$6.991 Month
  • Recursio Smart Yearly$29.991 Year
Show 1 more
  • Recursio Pro Yearly$69.991 Year
None

Expression Builder

No in-app purchases

Questions

Is Recursio free?
Recursio is free to download, with in-app purchases available.
Is Expression Builder free?
Expression Builder is free to download, with no in-app purchases.
Do Recursio or Expression Builder have ads?
Expression Builder shows ads; Recursio does not.
Which is updated more often, Recursio or Expression Builder?
Recursio ships an update fortnightly, and Expression Builder every 4 weeks. Most recently, Recursio was updated on October 24, 2026 and Expression Builder on October 22, 2026.

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