Quiet your mind.
Remember everything.
Remember everything.
A minimalist spaced-repetition flashcard app designed for deep focus.
Featuring native Furigana support and smart FSRS scheduling.
Featuring native Furigana support and smart FSRS scheduling.
Start Learning
Japanese (1 / 5)
日本語
にほんご
Focus first, then reveal the answer.
Distraction-Free Study
Enter a Zen-like state of focus. Our UI fades away during study sessions so you only see the card. No clutter, no distractions.
Deep Analytics & Insights
Track your learning journey with comprehensive statistics. Visualize your retention, card stability, and review intervals to optimize your study habits.
Future Due
The number of reviews due in the future.
☑ Backlog ◉ 1 month ○ 3 months ○ 1 year ○ all
Total: 805 reviews
Average: 24 reviews/day
Due tomorrow: 46 reviews
Calendar
◀
2023
▶
Jan
Feb
Mar
Apr
May
Jun
Jul
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Learn how we count contributions
Less
More
Reviews
The number of questions you have answered.
☐ Time ◉ 1 month ○ 3 months ○ 1 year
Days studied: 22 of 31 (71%)
Total: 2,463 reviews
Average for days studied: 112 reviews/day
Card Counts
☑ Separate suspended/buried cards
New
17,626
86.14%
Mature
2,353
11.5%
Young
269
1.31%
Review Intervals
Delays until reviews are shown again.
○ 1 month ○ 50% ◉ 95% ○ all
Average interval: 9.67 months
Card Stability
The delay at which retrievability falls to 90%.
○ 1 month ○ 50% ◉ 95% ○ all
Median stability: 1.42 years
Card Retrievability
The probability of recalling a card today.
Average retrievability: 90%
Estimated total knowledge: 930 cards / 465 notes
Card Difficulty
The higher the difficulty, the slower stability will increase.
Median difficulty: 39%
Retention
?
Pass rate of cards with an interval > 1 day.
○ Young ○ Mature ◉ All
Young
Mature
Total
Count
Today
N/A
N/A
N/A
0
Yesterday
N/A
N/A
N/A
0
Last week
N/A
N/A
N/A
0
Last month
N/A
N/A
N/A
0
Last year
93.5%
98.9%
98.4%
386
Answer Buttons
The number of times you have pressed each button.
○ 1 month ○ 3 months ◉ 1 year
Learning
Young
Mature
Hourly Breakdown
Review success rate for each hour of the day.
○ 1 month ○ 3 months ◉ 1 year
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Powered by the Science of FSRS
The Free Spaced Repetition Scheduler (FSRS) accurately models human forgetting curves, allowing you to study 20-30% less while retaining significantly more than traditional algorithms.
Research Paper
A Stochastic Shortest Path Algorithm for Optimizing Spaced Repetition
Published in ACM SIGKDD 2022, detailing the mathematical foundations and memory models behind the FSRS algorithm.
Read Paper ↗Empirical Analysis
FSRS vs SM-2: The 2024 Spaced Repetition Benchmark
A massive open-source analysis of over 4 billion reviews showing FSRS requires 20-30% fewer reviews to achieve the same retention.
View Benchmark ↗Frictionless Learning
1
Create
Add Japanese phrases and their meanings effortlessly. Bulk-adding is supported.
2
Review
Flip cards using intuitive keyboard shortcuts (Space to flip, 1-4 to rate).
3
Retain
Let the smart FSRS algorithm schedule your next optimal review time.
Ready to build your vocabulary?
Start your first session
JFlashLearn