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Core Feature

Spaced Repetition That Goes Deeper

Most apps use one layer of spacing. We use three, each targeting a different timescale of memory formation.

Why Cramming Fails

100%
58%
44%
36%
33%
28%
Learning 20 min 1 hour 9 hours 1 day 6 days

The Forgetting Curve (Ebbinghaus, 1885): Without strategic review, you lose 70% of new information within 24 hours. Spacing flattens this curve.

The Three Layers

Each layer targets a different aspect of memory formation.

1
Layer 1 Seconds to minutes

Within-Session Micro-Spacing

New words appear 3 times per session in different card formats, spaced by 2-5 other cards between each presentation.

Research: Landauer & Bjork (1978) showed that expanding retrieval practice within a session dramatically improves initial encoding.
Benefit: Creates strong initial memory traces through immediate, varied retrieval practice.
2
Layer 2 Days to months

Long-Term SM-2 Scheduling

The SuperMemo SM-2 algorithm schedules reviews at expanding intervals: 1→3→6 days, then multiplied by your performance-based ease factor.

Research: Pimsleur (1967) and Wozniak (1994) demonstrated optimal spacing schedules for vocabulary acquisition.
Benefit: Maintains vocabulary at minimal time cost. You review just before you'd forget.
3
Layer 3 Weeks to months

Curriculum-Level Sequencing

Smart ordering balances skill types (40% comprehension, 30% production, 20% listening, 10% tone) and interleaves across lessons.

Research: Rohrer & Taylor (2007) showed interleaved practice between topics yields better discrimination and transfer.
Benefit: Prevents skill imbalance and creates varied practice across content areas.

Balanced Skill Development

Layer 3 ensures you don't just recognize words—you can produce, hear, and correctly tone them.

Comprehension 40%
Recognition, reading
Production 30%
Writing, typing Thai
Listening 20%
Audio recognition
Tone 10%
Tone identification

These percentages are optimized based on research on L2 acquisition. Comprehension builds fastest; production and tone need more reinforcement.

What Makes This Different

An honest comparison with popular alternatives.

Duolingo

Their Approach

No true SRS. Reviews are semi-random, not optimized for memory.

Jam Kham

Full SM-2 implementation with proven optimal intervals.

Anki

Their Approach

Single-layer SRS only. No within-session spacing or curriculum balance.

Jam Kham

Three-layer system with micro-spacing and skill-weighted practice.

Memrise

Their Approach

Basic SRS, but no Thai-specific features or skill balancing.

Jam Kham

Thai-optimized with tone training integrated into the scheduling.

Research Foundation

Spaced repetition isn't a hack—it's one of the most replicated findings in cognitive psychology.

Ebbinghaus, H. (1885)

Documented the forgetting curve: 70% of new information is lost within 24 hours without review.

Cepeda et al. (2006)

Meta-analysis of 254 studies confirmed distributed practice produces effect size g=1.01 vs massed practice.

Roediger & Karpicke (2006)

Testing effect: retrieval practice produces 50% better retention than re-reading.

See All Research →

Related Features

Tone Training

Thai-specific tone practice

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Syllable Breakdown

Visual word analysis

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The Science

Full research citations

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Further Reading

The research behind lasting vocabulary retention.

Article Why Spaced Repetition Works The cognitive science explained Article The Testing Effect Why retrieval beats re-reading Article Active Recall vs Recognition The difference that matters for learning Research The Science Behind Jam Kham Full research citations and methodology

Experience the Difference

Feel how three-layer spacing creates lasting memory in your first session.

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