Practice without limits
OpticBench Premium
The SEO surface of this site is the free product: every calculator, guide, and reference page, forever. Premium is for heavy practice: the timer, the volume, and the analytics.
What Premium adds
- Timed exam mode with a configurable question count and clock
- Unlimited drills every day (free tier: 10 per day per skill)
- Progress analytics: per-skill accuracy, streaks, and history
- Downloadable printable formula sheet
Free forever
- Every calculator
- Every guide and reference page
- Untimed drills (10 per day per skill)
- The on-screen formula sheet
Everything is currently free
Premium plans are not on sale yet, so every feature above, timed exams included, is open to everyone. Nothing to buy, nothing locked.