Comparison

Stacks vs Racki

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

Head to head
About

Stacks

Create flashcards from your own experiences and conversations. This app uses spaced repetition to help you remember vocabulary longer with less study. It supports over 100 languages and offers offline study capabilities.

Highlights
  • Create cards from stories and conversations
  • Spaced repetition system (FSRS)
  • Offline study mode
  • Automatic translations
  • Supports over 100 languages
  • Romanization for select scripts
  • Clean, minimal interface
Features
Read full description

Your stories are better. Life's too short to cram from borrowed lists. Stacks turns trips and conversations into cards, then spaced-repetition (FSRS) handles the science. Episodic memory meets spaced repetition. Dream team. Benefits: โ€ข Keep momentum anywhere โ€“ Study offline on flights, trains, or dead zones. โ€ข Stay in sync across devices โ€“ Your progress follows you automatically. โ€ข Focus without distractions โ€“ No ads, just learning. โ€ข Create cards in seconds โ€“ Automatic translations speed up card creation. โ€ข Learn with clearer meanings โ€“ Premium DeepL translations offer high accuracy and context. โ€ข Remember longer with less study โ€“ FSRS schedules reviews at the right time. โ€ข Learn the language you care about โ€“ Supports over 100 languages. โ€ข Crack non-Latin scripts faster โ€“ Romanization for select languages like Japanese, Arabic, Russian, and Hindi. โ€ข Feel calm while you study โ€“ A clean, minimal interface that gets out of the way. Free and Plus Create up to 40 cards for free. Upgrade to Stacks Plus for unlimited cards, DeepL translations, spaced repetition customisation, and more. Perfect for language learners, students, and polyglots who want to study offline, master vocabulary, and remember more with flashcards. Privacy Policy: https://www.thestacksapp.com/privacy Terms of Service: https://www.thestacksapp.com/terms-of-service EUSA: https://www.apple.com/legal/internet-services/itunes/dev/minterms/

About

Racki

Features
Read full description

Racki turns the vocabulary from your Duolingo courses into spaced-repetition flashcards โ€” so the words you've learned actually stay learned. No account, no sign-up, nothing to configure. Open it and start reviewing. Enable the course sections you've finished and drill just those words โ€” nothing you haven't reached yet. What you get: โ€ข Spaced-repetition review that resurfaces words right before you'd forget them โ€ข Two drill directions โ€” meaning โ†’ word and word โ†’ meaning โ€” each scored separately, so you can see which way needs work โ€ข Original script displayed alongside, so you can always check your reading โ€ข Choose exactly which sections are active and review only what matters now โ€ข Progress tracked automatically as you go โ€ข Works fully offline โ€” the entire word set lives on your device โ€ข Your study data stays on your device: no account, no cloud, no sign-up โ€ข Free, kept that way by a single discreet banner ad โ€” no pop-ups, no paywalls Supported courses (18 and growing): Arabic, French, German, Greek, Hindi, Irish, Italian, Japanese, Korean, Latin, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, Turkish, Ukrainian Racki is an independent companion app and is not affiliated with, endorsed by, or sponsored by Duolingo. "Duolingo" is used only to describe the courses whose vocabulary you can review.

Screenshots

Stacks4 screens
Racki4 screens

Verdict

The call

The clearest difference is in-app purchases: Racki at none against Stacks's 2. Stacks's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Stacks sells 2 in-app purchases, starting at $9.99 per 3 months. Racki asks for nothing beyond the download.

Scorecard2 real differences ยท 6 level
Stacks versus Racki: the parameters behind the verdict, then further details
ParameterStacksRacki
PriceFreeFree
Positive reviews100.0% of reviewsโ€”
Update frequencyEvery 3 monthsโ€”
AdsNo โ€” betterYes
In-app purchasesYesNo โ€” better
MonetizationFreemiumโ€”
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.416.0 โ€” better
Further details โ€” not scored
Size77 MB46 MB
Age rating4+4+
DeveloperLewis HoyPatryk Grzesiak

In-app purchases

2 purchases

Stacks

Subscriptions2
  • Stacks+ Quarterly$9.993 Months
  • Stacks+ Yearly$27.991 Year
None

Racki

No in-app purchases

Questions

Is Stacks free?
Stacks is free to download, with in-app purchases available.
Is Racki free?
Racki is free to download, with no in-app purchases.
Do Stacks or Racki have ads?
Racki shows ads; Stacks does not.

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