Zero keypad. Zero guessing. Pure logarithmic precision across 30+ slide rule scales. Roulete Royal locks you into graduated drill sequences that build authentic computational muscle.
Download Roulete Royal
Activate one of three training accelerators. Each code grants instant access to advanced calculation modules unavailable to standard installs.
Promotional codes valid for new installations only. Training modules subject to graduated unlock progression. Codes expire 16.10.2026.
Roulete Royal simulates the physical interaction model of vintage slide rules through touch-responsive scale manipulation. The hairline cursor tracks your finger position with sub-pixel accuracy, allowing you to align logarithmic graduations exactly as you would on a Pickett N4-ES or Faber-Castell 2/83N. Every swipe translates to authentic slide movement across C and D fundamental scales.
The Manual enforces sequential mastery. Lesson 1 teaches deck anatomy—stock, slide, cursor, hairline. Only after demonstrating index seating competency does Lesson 2 unlock. By Lesson 7 you're executing square operations on the A scale. This forced progression prevents skill gaps and ensures computational fluency builds on verified foundations.
Roulete Royal removes all numeric input interfaces. To multiply 13 by 1.3, you seat the C index over 1.3 on D, then sweep the hairline to 1.3 on C. The rule returns mantissa 3.291. You carry the decimal point manually using checkbox controls. This workflow mirrors 1960s engineering practice and develops genuine scale-reading proficiency that pocket calculators eliminated.
Built by engineers who learned celestial navigation with K&E Log-Log Duplex Decitrig rules before GPS satellites existed. Every scale graduation in Roulete Royal matches vintage ruler specifications down to gauge mark placement.
The app enforces no-shortcut discipline: you cannot tap a result button or use voice input. Alignment precision determines answer accuracy, exactly as it did during Apollo mission trajectory calculations. This preserves the cognitive benefit of analog computation—spatial reasoning that digital keypads bypass entirely.
High-fidelity recreation of slide rule mechanics with touch-responsive scale movement, precision hairline cursor, and authentic graduation markings across 30+ logarithmic scale families.
Sequential unlock progression from deck anatomy through reciprocal chains, square operations, cube calculations, and decimal point carrying. Each lesson validates competency before advancing.
Comprehensive documentation of C, D, CI, DI, CF, DF, CIF, A, B, K, S, T, L scale families with graduation diagrams, pairing strategies, and worked reading examples.
Unlimited drill environment generating randomized multiplication, division, square, cube, and reciprocal targets. No cooldowns between sessions—practice until alignment becomes muscle memory.
Rotating calculation problems delivered through Reading of the Day feature. Covers mantissa extraction, gauge mark interpolation, and advanced scale combinations not addressed in core lessons.
No numeric keypad exists anywhere in the interface. All answers derive from visual scale alignment and hairline intersection reading, forcing development of genuine analog computation skills.
Android 6.0+ • 18.2 MB download • Install completes in 47 seconds on standard connections
Download Roulete RoyalRequires touch screen for scale manipulation. Ad-supported training modules. Rated for ages 12+. Priority access codes expire 16.10.2026.