Introducing SP33D: Your Ultimate Speedometer Companion!

PROBLEM

When my 2008 Prius dashboard went dark, I realized: drivers with broken speedometers or older vehicles have no safe alternative. Checking a phone GPS creates distraction and safety risk.

INSIGHT

I interviewed 8 drivers with similar problems. Common pain points: - Can't safely glance at phone while driving - Dashboard speedometer unreliable/missing - Need real-time speed for GPS-based navigation

They needed speed info visible without glancing down.

SOLUTION

Built SP33D to display speed prominently, with a Head-Up Display (HUD) mode that projects speed onto the windshield—so drivers never look away from the road.

DESIGN DECISIONS:

Large, legible typography (tested at night in car)
Minimal interface (only essential info visible while driving)
High contrast colors for visibility in bright/dark conditions
GPS + accelerometer for accuracy validation
Dual units (mph/km/h) for international users

PROCESS

Competitive research: Reviewed existing speedometer apps—most bury speed in clutter or drain battery
User interviews: Tested with 8 drivers in real conditions (night, day, highway)
Design iterations: Tested 4 HUD layouts; drivers preferred large speed, minimal distractions
Validation: Compared GPS speed to Waze; achieved 98% accuracy
Testing: Battery optimization reduced drain by 40% through efficient background processing

SP33D Screens