tengri.
Train Your Brain

Master
Mental Math.
Anywhere.

The privacy-first mental math trainer. Sharpen your mind, track your progress, and unlock your cognitive potential without sending a single byte to the cloud.

Current Streak
12
Days on Fire
24 × 15
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Privacy First

Local-Only Architecture. Your training data never leaves your phone. Practice in complete privacy.

Rapid Progress

Master multiplication, percentages, and division with our adaptive learning algorithm that targets your weak spots.

Gamified Growth

Earn streaks, unlock achievements, and visualize your cognitive improvement over time.

The Tengri Vertex Promise

Built by the engineering team at Tengri Vertex. We build mission-critical software for government and enterprise. We applied the same rigorous engineering standards to your cognitive training.