Free tools for reading, vocabulary, and Anki planning
These tools are built to answer practical questions before you upload a book, generate a deck, or overload your review queue.
Browse by category and intent
Treat this as a small product catalog: filter the cluster you care about, then sort the list the way you want to browse it.
Anki Review Load Calculator
Estimate how many reviews your Anki settings will create before your reading-based deck starts pushing back on the habit itself.
New Cards Per Day Calculator
Estimate how many new Anki cards per day your schedule can support before the review layer starts competing with your reading habit.
Anki Burnout Calculator
Estimate whether your current Anki settings are moving from useful support into review pressure that starts shrinking the reading habit itself.
Anki Backlog Catch-Up Calculator
Estimate how long it will take to clear an Anki backlog without pretending you can suddenly tolerate impossible review sessions.
Book To Anki Cards Calculator
Estimate how many Anki cards a reading plan will generate before you export a book and accidentally build a deck larger than the habit can carry.
Anki Missed Days Calculator
Estimate how much a few missed Anki days will distort your next session, and how long the queue may take to feel normal again.
EPUB Preview Tool
Upload an EPUB before full processing and preview extracted text, estimated word count, and file readiness before you generate a deck.
CEFR Text Checker
Paste an English passage and get a first-pass CEFR estimate based on sentence complexity, word length, and level-signal vocabulary.
Unknown Word Ratio Calculator
Paste a passage and estimate how much of it may sit above your current reading level before you commit to the book or build the deck.
Book Difficulty Checker
Estimate whether a book sample is a good fit, a stretch fit, or probably too hard for your current reading level.
Sentence Complexity Checker
Inspect sentence length and structural load so you can see whether a text feels difficult because of syntax, not just vocabulary.
Reading Friction Checker
Estimate how much a text may interrupt reading flow by combining sentence length, advanced-word density, and long-word share into one practical friction score.
Vocabulary Profiler
Profile a text sample by CEFR-style vocabulary distribution so you can see whether the text leans beginner, intermediate, or advanced.
Tools FAQ
Are these tools exact?
No. They are practical planning tools. The goal is to help you make better reading and deck decisions, not to pretend that one page can perfectly model every learning variable.
What should I use first?
Start with calculators if your problem is workload. Start with text analyzers if your problem is book choice, reading fit, or vocabulary density.
How should I use the result?
Use the output to reduce bad decisions early: choosing books that are too hard, adding too many new cards, or extracting more vocabulary than you will realistically review.
What is the point of this library?
The point is to help you choose books, extract less, and keep Anki small enough that it supports reading instead of competing with it.