Vocabulary that lives
where memory forms
86.7% of Bangkok working adults can't retrieve English words they studied for 12+ years. Kotoka anchors every word to the exact place, moment, and feeling you learned it.
fail vocabulary retrieval
The gap isn't effort.
It's encoding.
Traditional apps teach words in isolation, stripped of the sensory context that makes memory stick. You study "ambient" from a flashcard. You forget it. You studied it again. You forget it again.
The human brain doesn't store words — it stores experiences. Language learning apps have ignored neuroscience for decades.
Sensory-anchored vocabulary
Capture a word exactly where you are — the coffee shop, the BTS station, the moment it rains. Kotoka binds the word to your GPS location, ambient sound, weather, mood, and energy. When you recall the context, the word returns.
Geohash 150m Tags
Sub-block location precision. Every word knows its exact Bangkok neighbourhood.
Scene-Graph Memory
Episodic spatial-temporal binding — the scene you were in becomes the retrieval cue.
4-Node Sessions
Recognition → Production → Retrieval → Creative Use. Every word traverses all four cognitive modes.
Gemini 2.5 Flash
AI curriculum engine generates contextualised example sentences tailored to your life.
Memory Map — Bangkok
Words pinned to the exact BTS station where you learned them
4-node mixed
review session
Kotoka's SRS engine serves each word through four cognitive modes — optimized by δSKOTOKA=0 scheduling so every review lands at peak memory leverage.
Recognition
Does this word look familiar?
Production
Use it in a sentence.
Retrieval
What word means this?
Creative Use
Write your own example.
We solve for the exact moment memory stability reaches equilibrium. Our SRS combines Half-Life Regression, Bayesian Knowledge Tracing, and Item Response Theory into a single stability derivative that approaches zero at optimal review time.
Half-Life Regression
Models each learner's unique forgetting curve. Your memory half-life for every word, updated in real time.
Bayesian Knowledge Tracing
Tracks mastery probability per concept using hidden Markov models — knows when you truly know a word.
Item Response Theory
Calibrates item difficulty to your ability level. No more reviews that are too easy or too hard.
Episodic Scene Graph
Spatial-temporal word binding creates a personal memory palace. Place triggers recall.
Geohash 150m Tags
Sub-block Bangkok precision. Words are anchored to exact locations with 150m geohash cells.
SQLCipher · PDPA-First
Encrypted local storage. Privacy by design. Your sensory data never leaves your device unencrypted.
฿20.2B addressable
14% CAGR
Southeast Asia EdTech is the fastest-growing digital market in the region. English proficiency is the #1 career mobility driver for Thai professionals.
TAM — Total Addressable
All Thai adults seeking English proficiency, ฿20.2B/yr
SAM — Serviceable
Bangkok smartphone users 18–45, active learners, ฿4.04B/yr
SOM — Obtainable Y1
17,000 subscriber ceiling at ฿20.2M/yr revenue potential
2,800+ users before launch
Real users, real schools, real advisors — before a single public announcement.
"Kotoka represents a genuinely novel approach to vocabulary acquisition. The sensory-anchoring mechanism has strong theoretical grounding in episodic memory research."
Simple pricing.
Exceptional margins.
90.9% contribution margin with a clear path from B2C to B2B.
Monthly
- Full sensory-anchor capture
- 4-node SRS sessions
- Gemini curriculum engine
- Bangkok Memory Map
- 6 language pairs
Annual
- Everything in Monthly
- Priority Gemini processing
- Extended memory history
- Export word collections
- Early access to new features
B2B · Per Seat
- Institutional admin panel
- Progress analytics
- Custom word lists
- PDPA-compliant reporting
- Dedicated support
Unit Economics
Annual Recurring Revenue
Launch → Scale → Expand → Dominate
Four phases from MVP to Southeast Asia market leader.
Launch
Scale
Expand
Dominate
Three 17-year-olds
building the future of vocabulary
We're not waiting to grow up. We're shipping.
Teerapat Krajaejan
Full-stack Flutter architecture, AI pipeline design, Gemini integration, and product vision.
Tinnakrit Charoensin
Flutter feature development, product QA, technical documentation, and release engineering.
Pachalada Jujoi
Financial modeling, UI/UX design, Sarabun-fluent Thai content, and investor communications.
ดร.กอบชัย ดวงรัตนเลิศ
Lead Advisor · Educational Technology
ดร.นพรัตน์ ศรีเจริญ
Chulalongkorn University · Special Education Research
นายทินภัทร สิทธิสุวรรณ
Innovation Strategy Advisor
Let's build together.
Kotoka is raising a pre-seed round. Join us in making vocabulary retrieval a solved problem for 20M+ Thai learners.