Comparison

constant. vs Deckbase

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

Head to head
About

constant.

Features
Read full description

constant. makes studying effortless. Upload your notes, textbooks, slides, or PDFs and let AI instantly generate questions for you. No more wasting time creating flashcards - just start learning. - Instant question decks from your own material - Interactive "Ask Camel" AI Chat to explain answers and follow-up questions - Spaced repetition to boost memory and recall - Search and share public decks - Study smarter, not longer With constant., you focus on learning - AI handles the prep.

About

Deckbase

Effortlessly create flashcards from PDFs, notes, or photos using AI. Study with spaced repetition, quizzes, and audio. Syncs across devices and supports Anki import/export.

Highlights
  • AI-generated flashcards from documents and photos
  • Spaced repetition study scheduler
  • Interactive quizzes
  • Audio playback for decks
  • Anki import and export
  • Cross-device syncing
Features
Read full description

Deckbase is an AI flashcard maker. Turn PDFs, lecture notes, photos and chat prompts into flashcards in seconds, edit the drafts, then study them with spaced repetition, quizzes and audio. Why Deckbase: - Flashcards from your study materials Upload PDFs, notes, images, DOCX, Excel or CSV and get a first draft of flashcards in seconds. Review and edit every card before you study. - AI chat assistant Name a topic or ask a question in chat and get a deck back instantly. - Scan pages with your camera Take a photo of a textbook page or handout and turn the text into cards without typing. - AI images and voice Add mnemonic images and natural pronunciation audio to every card. Great for vocabulary and language learning. - Listen to your decks Turn a deck into an audio track and review on a walk, on your commute or at the gym. Tracks can read each block's label aloud, so you always know what you're hearing. - Quizzes that keep you sharp Test yourself with multiple choice, matching, word order and typed answers. Build streaks, and tap "I don't know" to see the answer instead of guessing. - A review scheduler you can trust Reviews follow proven SM-2 and FSRS scheduling, with per-deck presets for new cards, daily limits and learning steps. - Works with your Anki decks Import .apkg files with their note types and layouts, or export back anytime. No lock-in. - Study anywhere Your decks and progress sync between iPhone, iPad and the web. Deckbase is available in 45 languages. - For every kind of learner Exam prep, medical school, nursing, language vocabulary, certifications and professional learning. How it works: 1. Add a file, a photo or a chat prompt 2. Review and edit the AI draft 3. Study with spaced repetition, quizzes and audio tracks Legal: Privacy Policy: https://www.deckbase.co/privacy-policy Terms and Conditions: https://www.deckbase.co/terms-and-conditions

Screenshots

constant.4 screens
Deckbase4 screens

Verdict

The call

The clearest difference is in-app purchases: constant. at none against Deckbase's 7. constant. also leads on ads (none vs shown). On price, update cadence, 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. Deckbase sells 7 in-app purchases, starting at $5.99 per month. constant. asks for nothing beyond the download.

UpkeepUpdate frequency

constant. ships an update every 3 days, Deckbase weekly. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

Scorecard2 real differences ยท 6 level
constant. versus Deckbase: the parameters behind the verdict, then further details
Parameterconstant.Deckbase
PriceFreeFree
Positive reviewsโ€”0.0% of reviews
Update frequencyEvery 3 days โ€” betterWeekly
AdsNo โ€” betterYes
In-app purchasesNo โ€” betterYes
Monetizationโ€”Free with in-app purchases
DevicesiPhoneiPhone, iPad โ€” better
Requires iOS16.6 โ€” better17.0
Further details โ€” not scored
Size28 MB119 MB
Age rating4+4+
DeveloperChun-Huei LiuYosuke Sakurai

In-app purchases

None

constant.

No in-app purchases

7 purchases

Deckbase

Subscriptions4
  • Basic Month7 Days trial$5.991 Month
  • Pro Month7 Days trial$11.991 Month
  • Basic Year7 Days trial$59.001 Year
Show 1 more
  • Pro Year7 Days trial$119.001 Year
One-time3
  • Starter Pack$4.99
  • Booster Pack$9.99
  • Mega Pack$19.99

Questions

Is constant. free?
constant. is free to download, with no in-app purchases.
Is Deckbase free?
Deckbase is free to download, with in-app purchases available.
Do constant. or Deckbase have ads?
Deckbase shows ads; constant. does not.
Which is updated more often, constant. or Deckbase?
constant. ships an update every 3 days, and Deckbase weekly. Most recently, constant. was updated on November 8, 2026 and Deckbase on November 5, 2026.

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