Comparison

GoodGeometry vs Klango

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

Head to head
About

GoodGeometry

Enhance geometry tasks within GoodNotes with infinitely zoomable tools, paper templates, and cover designs. Create custom templates and covers with editable patterns. Export your work as zoomable PDFs for versatile use.

Highlights
  • Infinitely zoomable geometric tools
  • Customizable paper templates
  • Editable cover designer
  • Zoomable PDF export
  • Multiple tool designs
  • GoodNotes and collection file formats
Features
Read full description

With GoodGeometry tools, geometry tasks in Goodnotes can be easily edited at correct scale. Geometry tools, paper templates and covers design tools for students, teachers and presentations. All tools, templates and covers are infinitely zoomable without loss of sharpness Export as zoomable PDF - can be used anywhere ■ Geometric triangles (Geodreieck) ■ Compasses ■ Rulers (1/10 millimeter scale) ■ Protractors ■ Paper templates in the correct scale ■ Paper template designer - choose your own colors and line thicknesses ■ Cover Designer with pattern generators - everything editable Choose your favorite tool from many different designs. You get all the tools in two file formats: ■ goodnotes files: You can share .goodnotes files directly with Goodnotes. ■ collection files: First, save .collection files to your files. Then create a new sticker in Goodnotes and import them into the sticker. Easily share all templates and covers with any program of your choice. How to do this is explained in the app. Please also watch our tutorial videos. No in-app purchases, no advertising! Privacy policy: https://www.iubenda.com/privacy-policy/51617525 Terms of use: https://www.iubenda.com/terms-and-conditions/51617525

About

Klango

This app offers a powerful flashcard system for learning any subject, featuring spaced repetition and multiple study modes. It allows for easy deck creation, import, and sharing, with optional AI-powered tools for generating and practicing content. Your data is stored locally and works offline, ensuring privacy and accessibility.

Highlights
  • Spaced repetition learning
  • Multiple study modes (Flashcards, Learn, Write, Test, Match)
  • AI deck generation and assistance
  • Offline functionality
  • Import Anki decks
  • Community shared decks
  • Progress tracking (streaks, heatmap)
Features
Read full description

Klango is the flashcard app for learning that actually sticks. Fast, beautiful, local-first. LEARN ANYTHING • Vocabulary, exam facts, formulas – anything you want to remember • Five study modes: Flashcards, Learn, Write, Test, Match • Spaced repetition shows each card right before you would forget it • Smart answer checking across scripts (Cyrillic/Latin, Chinese, Japanese) STAY ON TRACK • Streaks, heatmap and study reminders • A few minutes a day is enough YOUR DECKS, YOUR WAY • Create a deck in seconds • Import Anki decks (.apkg / .colpkg) in one tap • Community: hundreds of free starter decks in 13 languages – or share your own • Natural voices for your cards with your own ElevenLabs key YOURS. OFFLINE. PRIVATE. • Your cards and progress live on your device and work offline • Optional sync across devices – even without an email address • Export or delete all your data at any time • 30 interface languages, iPhone and iPad, Light and Dark Mode, VoiceOver and Dynamic Type KLANGO AI (OPTIONAL) • AI decks: describe a topic, get a complete deck in seconds • AI assistant: chat to create, extend and tidy up your decks • AI voice practice: an AI tutor quizzes you on your own cards • Try it free for 3 days Klango AI (monthly, with a 3-day free trial for new subscribers) and Klango AI Plus (monthly, larger AI allowance) are auto-renewing subscriptions. Payment is charged to your Apple ID at confirmation of purchase (after the trial). The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your App Store account settings. AI usage is subject to a fair monthly allowance per plan. Terms of Use: https://klango.me/terms Privacy Policy: https://klango.me/privacy

Screenshots

GoodGeometry4 screens
Klango4 screens

Verdict

The call

The clearest difference is price: Klango at Free against GoodGeometry's $3.99. Klango also leads on review sentiment (100% vs 64%). GoodGeometry's advantage is in-app purchases (none vs 2) and update cadence (every 2 months 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

Klango is free to download; GoodGeometry costs $3.99 up front. Klango sells 2 in-app purchases, starting at $5.99 per month. GoodGeometry asks for nothing beyond the download.

UpkeepUpdate frequency

GoodGeometry ships an update every 2 months, Klango every 5 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
GoodGeometry versus Klango: the parameters behind the verdict, then further details
ParameterGoodGeometryKlango
Price$3.99Free — better
Rating1.2 (5 ratings) — better—
Positive reviews64.3% of reviews100.0% of reviews — better
Number of ratings5 — better—
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.415.0 — better
Further details — not scored
Size1.3 GB53 MB
Age rating4+4+
DeveloperBirgit StockCem Hasanbeyoglu

Customer experience

GoodGeometry

All ratings5 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews28 reviews
Positive64.3%
Neutral0.0%
Negative35.7%

Klango

Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

GoodGeometry

No in-app purchases

2 purchases

Klango

Subscriptions2
  • Klango AI3 Days trial$5.991 Month
  • Klango AI Plus$6.991 Month

Questions

Is GoodGeometry free?
GoodGeometry costs $3.99, with no in-app purchases.
Is Klango free?
Klango is free to download, with in-app purchases available.
Do GoodGeometry or Klango have ads?
Neither GoodGeometry nor Klango shows ads.
Which is updated more often, GoodGeometry or Klango?
GoodGeometry ships an update every 2 months, and Klango every 5 months. Most recently, GoodGeometry was updated on November 3, 2026 and Klango on October 31, 2026.

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