LangBlitz Help Center
LangBlitz is a vocabulary building app for Android that uses spaced repetition to help you actually remember English words, not just recognize them for a day and forget them a week later. This help center covers everything you need to get the most out of it, whether you just installed the app five minutes ago or you have been using it for months and want to understand what is actually happening behind the scenes when a word shows up for review.
If you are brand new to LangBlitz, start with Getting Started below. If you already know your way around the app but want to understand why words come back for review when they do, read the spaced repetition guide. If you are studying for a specific exam, the exam prep guide explains how to use the app's relevance tags to focus your time. Everything else on this page is organized by topic so you can jump straight to what you need.
Getting Started
New installs of LangBlitz begin with a short placement quiz, fifteen words shown one at a time, where you simply mark whether you already know each word or not. Based on how you answer, the app sets your starting CEFR level to either A1 (beginner) or A2 (elementary). The quiz is deliberately conservative: its job is only to tell true beginners apart from learners who already have some basic foundation, not to detect intermediate or advanced ability from fifteen yes or no answers. From there, automatic level progression takes over and moves you up through B1, B2, C1, and C2 as you actually demonstrate mastery of each level's words during real review sessions.
After the placement quiz, you land on the home screen, which is the center of the app. From there you can start a review session, take the Daily Quiz, browse word groups by topic, or open Vocabulary World to see your progress visualized as a globe. The Getting Started guide walks through the placement quiz in more detail, explains what each CEFR level actually means in practical terms, and covers the first few things worth doing in your first session so the app's scheduling has good data to work with early on.
Read the full guide: Getting Started with LangBlitz
Spaced Repetition and FSRS
The core idea behind LangBlitz is that you should see a word right before you are about to forget it, not on a fixed schedule like "every three days" that ignores whether you actually remember it or not. LangBlitz uses FSRS, short for Free Spaced Repetition Scheduler, a modern algorithm that tracks how difficult each word has been for you personally and adjusts the interval between reviews accordingly. A word you get right easily and quickly will come back after a longer gap. A word you struggle with will come back sooner, sometimes the same day if you rate it as forgotten.
This is different from older flashcard apps that use fixed intervals or simple "again in one day, three days, seven days" style progressions for everyone regardless of how well they actually know each card. FSRS is built on real memory research and personalizes the schedule to you specifically, which is why two people studying the same word list can end up with very different review schedules within a few weeks.
The spaced repetition guide explains the four review states a word moves through (new, learning, review, and relearning if you forget it later), what "retrievability" means and why it decays over time even for words you have mastered, and why occasionally seeing an "old" word you thought you knew well is actually the system working correctly rather than a bug.
Read the full guide: How Spaced Repetition and FSRS Work in LangBlitz
Daily Quiz and Practice Quiz
LangBlitz has more than one way to test yourself, and they serve different purposes. The Daily Quiz is a short, five question quiz available once per day to every user, free or premium, built from words you have already been introduced to. It resets every day and does not affect your review schedule directly, it is more of a quick daily check-in.
Practice Quiz is a longer, ten question quiz available to premium users that specifically targets your weak spots. It looks at which questions you have gotten wrong most often or seen least recently and prioritizes those, so over time it becomes a genuinely adaptive way to shore up the words that are actually giving you trouble, rather than a random sample.
There is also a Fast-track Level Up test for users who feel ready to skip ahead to the next CEFR level without grinding through every remaining word in their current level first. It is a fifty question test with a ninety percent pass threshold, intentionally difficult, meant for people who already know most of the vocabulary at their current level from outside experience with English.
The quiz guide covers how each mode selects its questions, how streaks and the streak shield work, and what happens if you leave a quiz partway through.
Read the full guide: Daily Quiz vs Practice Quiz in LangBlitz
Vocabulary World
Vocabulary World shows your entire vocabulary as an interactive three dimensional globe, with every word placed as its own point you can rotate and explore, words in the same topic group clustered together and linked like a constellation. It's open to every user; premium adds the ability to tap into any word, including ones you have not studied yet, rather than only your fifteen free words. Each word is colored based on how well you have mastered it, so at a glance you can see which words you have a strong grip on and which ones need more attention.
For users who have difficulty distinguishing colors, there is a shape cues setting that adds rings and outlines on top of the color coding, so mastery level is never communicated by color alone. The Vocabulary World guide explains exactly what each color and shape tier means, how mastery is calculated, and how to navigate the globe itself.
Read the full guide: Exploring Vocabulary World
Exam Prep: IELTS, TOEFL, GRE, GMAT, and CAT
Many of the words in LangBlitz's library are tagged for relevance to specific standardized tests, including IELTS, TOEFL, GRE, GMAT, and CAT. If you are studying for one of these exams specifically, you do not have to work through the entire word library in order. The exam prep guide explains how these relevance tags work, how to find them on a word card, and how to structure your study sessions around a specific exam's vocabulary demands while still getting the benefit of the app's spaced repetition scheduling.
Read the full guide: Using LangBlitz for IELTS, TOEFL, GRE, GMAT, and CAT Prep
Export, Import, and Backup
LangBlitz does not require an account and does not store your progress anywhere except on your own device by default. That is good for privacy, but it also means if you get a new phone or reinstall the app, your progress would normally be gone unless you back it up first. The export feature lets you save your review history, streak, and settings to a file you control, and the import feature restores that same data on another device or after a reinstall.
The backup guide covers exactly what is included in an export, what is deliberately left out, and how to move your progress between devices safely.
Read the full guide: Backing Up and Restoring Your LangBlitz Progress
Free vs Premium
LangBlitz is free to start, no account and no payment required to begin learning. Free users get full access to fifteen word cards plus the Word of the Day widget, can browse all one hundred and nineteen topic groups to see what is available, and can take the Daily Quiz every day. Premium unlocks the complete word library, unlimited Practice Quiz sessions, full access to every word in Vocabulary World, and backup and restore.
The free versus premium guide breaks down exactly what each tier includes, so you can decide whether premium is worth it for how you plan to use the app before you commit to anything.
Read the full guide: Free vs Premium in LangBlitz
Frequently Asked Questions
For quick answers to common questions that do not need a full guide of their own, including questions about notifications, themes and accessibility settings, text to speech, and general troubleshooting, see the FAQ page.
Read the full guide: LangBlitz FAQ
A few tips before you dive in
A handful of things are worth knowing up front, before you get deep into any single guide below.
First, LangBlitz works fully offline once installed. There is no login screen, no account creation, and no internet connection required to study. This is a deliberate choice, not a missing feature, and it is why the backup guide matters so much for anyone who plans to switch phones eventually.
Second, the app's daily new word limit is there on purpose. You can adjust how many new words are introduced per session in Settings, but the default is set to a number that spaced repetition research suggests most people can actually retain, rather than the largest number you could technically cram in. Raising it too high early on tends to create a large review backlog a few weeks later, since every new word you learn today becomes a review due again in a few days.
Third, if you ever see a word card or quiz question that looks wrong, outdated, or just does not make sense, use the report option available on that specific card or question rather than trying to work around it. Reports go directly into a review queue and are the fastest way any mistake actually gets fixed for everyone, not just you.
Fourth, your CEFR practice level and your actual mastery are two different things tracked separately. Your practice level determines which new words get introduced to you day to day. Your mastery, visible on the home screen and in Vocabulary World, reflects how well you currently remember what you have already studied, and it can go down over time for words you have not reviewed in a while, even at a level you have technically finished. That is expected behavior, and the spaced repetition guide explains exactly why.
Still need help?
If your question is not answered anywhere in this help center, you can reach out through the support option inside the app itself, found in Settings. Reporting a specific word card or quiz question you think is wrong is also built directly into the app, so if something looks off while you are studying, you can flag it right from that screen rather than needing to describe it from memory later.