RetroCalc: Retro Calculator

Remember when calculators were real machines? RetroCalc brings back the classic 1980s scientific calculator — the brushed-metal faceplate, the clicky sculpted keys, the pale-green LCD with its ghost segments — as a fast, precise, beautiful app.

It doesn't just look the part. RetroCalc works exactly like the calculator you grew up with, down to the way % and the constant (K) function behave.

◆ THE REAL RETRO EXPERIENCE
• Faithful early-80s design: brushed aluminum, sculpted three-tone keys, solar strip
• Authentic 7-segment LCD with ghost segments and classic annunciators
• Key click sounds and haptic feedback, just like pressing real keys
• Portrait and landscape desktop-calculator layouts
• Two looks: Silver ’83 and Dark Solar (coming soon)

◆ A SERIOUS SCIENTIFIC CALCULATOR
• Exact arithmetic engine: 0.1 + 0.2 = 0.3, and 1 ÷ 3 × 3 = 1 — exactly
• Trig, hyperbolics, logs, powers and roots in DEG / RAD / GRAD
• Fractions (a b/c) with exact fraction arithmetic
• Degrees-minutes-seconds (° ′ ″) entry, arithmetic and conversion
• Traditional percent key behaviour (200 + 10% = 220)
• Constant calculations (K): press an operator twice to repeat it
• nCr, nPr, factorials, MOD, Δ% percent change
• FIX / SCI / ENG display modes with digit grouping options

◆ EVERYDAY POWER TOOLS
• Unit conversions: 112 units in 13 categories, from fuel economy to data size
• 23 physical constants (NIST values)
• 10 memories (M plus 9 numbered) and a 50-result history
• Everything is saved — close the app mid-calculation, come back later
• Fully offline. No ads. No tracking. No permissions.

Long-press any key for its orange SHIFT function, exactly like holding the real thing.

RetroCalc is built by an indie developer who misses real calculators. If you enjoy it, a rating means a lot!