Features | LangArena
All-in-one platform

Everything you need
to ace your exam.

From quick drills to full-length tests, AI coaching to real-time analytics — every tool engineered for maximum score improvement.

30+
Full tests
AI drills
13
Skill vectors
Quick practice
AI Coach
Skill tracker
Analytics
Workbook
Mobile app
Quick Practice
Full Length Tests
AI Coach
Workbook
Skill Tracker
Custom Algorithm
Analytics
Mobile App
Quick Practice
Full Length Tests
AI Coach
Workbook
Skill Tracker
Custom Algorithm
Analytics
Mobile App

Built for every stage
of your journey.

Ten integrated tools that work together to accelerate your progress.

Quick Practice
Jump into targeted drills in seconds. The algorithm selects questions calibrated to your weakest skill vectors — perfect for 5-minute sessions on the go.
Adaptive · Instant start
Full Length Tests
Over 30 exam-format tests that mirror real exam conditions. Timed sections, authentic question types, and scoring that maps directly to official scales.
30+ tests · Exam-accurate
Customizable Tests
Build your own tests by section, skill area, difficulty level, or question type. Focus exactly where you need it — no more wasting time on sections you've mastered.
Flexible · Your rules
AI Coach
An intelligent assistant that finds questions, generates custom drills, explains complex topics in plain language, and fine-tunes your algorithm settings — all in natural conversation.
Generative · Conversational
Workbook
Targeted study organized by category and section. Dive deep into specific skill areas with structured lessons, example passages, and progressive drill sets.
Structured · By category
Real-Time Skill Tracker
Watch 13 skill vectors update live as you practice. Instantly see which abilities are growing and which need attention — the algorithm adapts automatically.
13 vectors · Live updates
Custom Algorithm
Our proprietary IRT-powered engine builds a vector space of your abilities. Adjusted per exam to reduce training time by up to 60% and improve scores faster.
Mobile Application
Practice anywhere with our native mobile experience. Syncs seamlessly — start a session on your phone, finish on desktop. Your progress travels with you.
iOS · Android · Synced
Data Analytics
Deep insights into your practice patterns, time distribution, accuracy trends, and score projections. Understand not just where you are, but where you're heading.
Visualizations · Trends
Progress Tracking
Set target scores and watch your trajectory unfold. Daily, weekly, and monthly views show exactly how each practice session contributes to your improvement.
Goals · Milestones
30+
Full-length practice tests
7
Supported exams
13
Skill vectors tracked
60%
Faster score improvement
Quick practice

Five minutes. Maximum impact.

Quick Practice sessions are powered by our adaptive algorithm. Each question is selected to maximize information gain on your weakest skill vectors. Whether you have 5 minutes or 50, every second counts.

Quick Drill · Vocabulary
4:32
The passage suggests that the phenomenon was primarily caused by:
Tectonic plate shifts
Atmospheric pressure changes
Solar radiation patterns
Ocean current disruption
6 / 10 questions
AI Coach

Your personal tutor, always on.

The AI Coach understands your skill profile and adapts to your learning style. Ask it to find specific question types, generate custom drills for tricky topics, explain complex grammar rules, or even adjust your algorithm parameters — all through natural conversation.

Find and filter questions by type, topic, or difficulty
Generate custom questions on any topic
Explain answers and break down complex concepts
Fine-tune your algorithm and study plan
I keep getting inference questions wrong. Can you help?
AI
I see your inference θ is at -0.92. Let me generate 5 targeted inference drills focusing on "author's purpose" — that's your weakest micro-skill. Ready?
Yes, let's do it.
AI
Starting drill. I've also adjusted your algorithm to weight inference questions 2x for the next 3 sessions.
Real-time skill tracker

See every skill, live.

Our tracker decomposes your exam into 13 independent skill vectors and updates them after every single answer. Strengths become clear. Weaknesses become targets. The algorithm uses this data to automatically prioritize what matters most.

Skill Vectors — Live
Reading
82% +4
Listening
91% +2
Speaking
58% +7
Writing
72% +3
Vocab
67% +5
Inference
45% +12
Updated 2 seconds ago
Data analytics

Data-driven decisions, not guesswork.

Track practice frequency, accuracy trends, time-per-question patterns, and projected scores. See which sessions were most productive, identify your peak study hours, and understand exactly how each drill contributes to your progress.

Weekly Performance
Mar 21 – Mar 28
MonWedFriSun
142
Questions answered
78%
Avg. accuracy
+8
Projected gain

Structure meets flexibility.

Workbook

Study by category

Organize your practice by exam section, topic, or skill area. Each workbook chapter builds progressively — from concept review to targeted drills to assessment. Perfect for systematic, deep study sessions.

Section-by-section breakdown
Progressive difficulty scaling
Concept review + practice
Completion tracking
Full Length Tests

Exam-day simulation

Over 30 complete practice tests that replicate real exam conditions. Full timing, authentic question formats, and scoring algorithms calibrated to match official scales. Know exactly where you stand before test day.

30+ complete tests per exam
Official scoring alignment
Timed sections
Post-test skill analysis
Mobile + Progress

Practice anywhere.
Track everything.

Our mobile application gives you the full LangArena experience in your pocket. Set daily goals, track streaks, and monitor your progress trajectory — all synced in real time across every device.

5 min
Average quick session
100%
Cross-device sync
Daily
Goal tracking
Good morning, Alex
🔥 12-day streak
Daily goal 73%
Quick drill
Full test
AI Coach

Start your free
diagnostic today.

No credit card. No commitment. Discover where you stand in 15 minutes.

Free forever on the Starter plan.