Comparison

Factoring Quadratics PRO vs Nihongo Lessons

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

Head to head
About

Factoring Quadratics PRO

This app helps users factor quadratic trinomials by entering three variables. It provides detailed solution steps and stores all calculations in a history that can be managed and shared.

Highlights
  • Factors quadratic trinomials
  • Detailed solution steps
  • History of calculations
  • Supports positive/negative numbers and decimals
  • Shareable solutions
  • Input validation
Features
Read full description

This app uses a self-made algorithm for transforming quadratic trinomials into a product of two binomials. For this, only three variables must be entered. All calculations are stored in the history. The final solution can be shared. [ Content ] - the variables for a, b and c must be entered - transformation of a quadratic trinomial into a product of binomials - history function to save input - detailed solution - positive and negative numbers, decimals are supported - no ads! [ Usage ] - there are 3 fields for entering the values ​​using a modified keyboard - if values are missing, the text fields are highlighted - you can switch between the solution, input view and history by swiping and / or touching the buttons - the entries in the history can be deleted or sorted manually - if you select an entry in the history, it will be loaded automatically for the calculation - the entire history can be deleted by pressing a button

About

Nihongo Lessons

This app helps learners of all levels achieve Japanese fluency. It uses a flashcard format to teach vocabulary, grammar, and writing systems, with advanced spaced repetition for effective retention. Content is sourced from real manga for advanced learners.

Highlights
  • Learn Hiragana and Katakana
  • 7000+ handcrafted sentences
  • Professional voice actor audio
  • Advanced Spaced Repetition System (SRS)
  • Vocabulary and grammar from manga
  • Flashcard learning format
Features
Read full description

A new app for people serious about becoming fluent in Japanese, from the maker of Nihongo: a modern Japanese dictionary. Nihongo Lessons is based off the excellent Japanese Level Up (Jalup) series, and is made to help all levels of learners. * If you're a complete beginner, the app starts you off by teaching you to write the Japanese alphabets hiragana and katakana, and then quickly starts building your vocabulary and grammar fundamentals. * If you're at an intermediate level, you can jump into content that will help you grow your Japanese grammar, vocabulary, and listening skills more efficiently than ever before. * If you're an advanced learner diving into the world of native content or studying for JLPT N1, Nihongo Lessons can help fill in the gaps in your knowledge with vocabulary and grammar pulled directly from real manga. Instead of a traditional textbook, everything in Nihongo Lessons is in a flashcard format. Flashcards are easier to take in, easier to know how much to learn and how often to review, and simplify the mountain of information you need to absorb. Each flashcard introduces one new sentence for you to understand, and every new sentence introduces exactly one new word, grammar point, or concept. This keeps you constantly moving forward in your learning journey - never bored, never overwhelmed. * Learn to write hiragana and katakana, the main alphabets of the Japanese language. * Progress from beginner to fluent across 7000 handcrafted sentences, each introducing a single new word or concept. * Listen to sentences spoken out loud by a professional voice actor. * Advanced Spaced Repetition (SRS) to help you retain everything you've learned for the long-term. * Nihongo Lessons doesn’t just plop a fun game on top of the language. It engages the brain’s natural urge to solve problems by making learning the language itself the game.

Screenshots

Factoring Quadratics PRO4 screens
Nihongo Lessons4 screens

Verdict

The call

The clearest difference is price: Nihongo Lessons at Free against Factoring Quadratics PRO's $1.99. Nihongo Lessons also leads on rating (4.8 vs 4.3) and ratings volume (126 vs 13). Factoring Quadratics PRO's advantage is in-app purchases (none vs 13) and device support (3 vs 1). On 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

Nihongo Lessons is free to download; Factoring Quadratics PRO costs $1.99 up front. Nihongo Lessons sells 13 in-app purchases, starting at $4.99 per month. Factoring Quadratics PRO asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Nihongo Lessons holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Nihongo Lessons has 126 ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 75% of Factoring Quadratics PRO's written reviews are positive against 85% of Nihongo Lessons's.

UpkeepUpdate frequency

Factoring Quadratics PRO ships an update monthly, Nihongo Lessons every 3 weeks. Both last shipped on September 14, 2026.

Scorecard8 real differences · 2 level
Factoring Quadratics PRO versus Nihongo Lessons: the parameters behind the verdict, then further details
ParameterFactoring Quadratics PRONihongo Lessons
Price$1.99Free — better
Rating4.3 (13 ratings)4.8 (126 ratings) — better
Positive reviews75.0% of reviews84.8% of reviews — better
Number of ratings13126 — better
Update frequencyMonthlyEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better17
Further details — not scored
Size179 MB258 MB
Age rating4+4+
DeveloperGlindemann, Sennoun, Langer GbRSerpenti Sei Japan

Customer experience

Factoring Quadratics PRO

All ratings13 ratings
Positive84.6%
Neutral0.0%
Negative15.4%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

Nihongo Lessons

All ratings126 ratings
Positive94.4%
Neutral2.4%
Negative3.2%
Written reviews33 reviews
Positive84.8%
Neutral6.1%
Negative9.1%

In-app purchases

None

Factoring Quadratics PRO

No in-app purchases

13 purchases

Nihongo Lessons

Subscriptions2
  • All Access Monthly7 Days trial$4.991 Month
  • All Access Yearly7 Days trial$49.991 Year
One-time11
  • Beginner Deck (Discounted)$59.99
  • Champion Deck (Discounted)$59.99
  • Expert Deck (Discounted)$59.99
Show 8 more
  • Master Deck (Discounted)$59.99
  • Intermediate Deck (Discounted)$83.99
  • Beginner Deck (Discounted)$101.99
  • Beginner Deck$119.99
  • All Decks (Discounted)$149.99
  • All Decks (Discounted)$254.99
  • All Decks$299.99
  • All Decks (Discounted)$299.99

Questions

Is Factoring Quadratics PRO free?
Factoring Quadratics PRO costs $1.99, with no in-app purchases.
Is Nihongo Lessons free?
Nihongo Lessons is free to download, with in-app purchases available.
Which has better reviews, Factoring Quadratics PRO or Nihongo Lessons?
Nihongo Lessons is rated higher. Factoring Quadratics PRO averages 4.3 out of 5 from 13 ratings, while Nihongo Lessons averages 4.8 from 126 ratings.
Do Factoring Quadratics PRO or Nihongo Lessons have ads?
Neither Factoring Quadratics PRO nor Nihongo Lessons shows ads.
Which is updated more often, Factoring Quadratics PRO or Nihongo Lessons?
Factoring Quadratics PRO ships an update monthly, and Nihongo Lessons every 3 weeks. Most recently, Factoring Quadratics PRO was updated on September 14, 2026 and Nihongo Lessons on September 14, 2026.

Other comparisons