Calsee

A calculator that wears a new look every swipe.

Swipe the display and Calsee generates a fresh theme. The sum you were typing stays exactly where it was, and the answer is exact.

Coming soon toGoogle Play Coming soon to theApp Store

Coming soon: Google Play and App Store

Calsee in Midnight Lens, a Liquid Glass theme with translucent navy keys, violet operators and a cyan equals key over a teal-to-purple glow.
Calsee in Lavender Dusk, a Material 3 Expressive theme with lilac and pink keys, showing 15,000 + 2,480 = 17,480.
Calsee in Voltage Pink, a NeoPOP theme with hot pink operators and a lime equals key on near-black.
Calsee in Mango Sticker, a Neo-brutalism theme on a yellow poster background with white keys, thick black outlines, hard shadows and coral operators.
Calsee in Cyan Tube, a retro theme with a glowing cyan vacuum-fluorescent display and grey keycaps.
Calsee in Porcelain Morning, a light neumorphic theme with soft cream keys and a rust equals key.
Calsee in Midnight Sapphire, a dark navy Material theme with periwinkle operators and a gold equals key.
Calsee in Electric Mango, a NeoPOP theme with mango-yellow operators and a teal equals key on black.
Calsee in Oatmeal Desk, a beige desk-calculator theme with a green seven-segment LCD and an orange equals key.
Calsee in Slate Nocturne, a dark neumorphic theme with slate keys and sky-blue operators.

Ten of millions Hero themes from the app, as it runs today

Scroll the phones sideways to see more themes.Swipe the phones, or press ] and [ like on Calsee for desktop. The page changes with them.

Swipe the display. Get a new theme.

Each swipe generates a theme on your phone in one of six styles: palette, key shape, press motion, type, background and sound, all from one seed. There are millions of combinations, and a hand-made hero turns up every few swipes. Swipe back and the last theme returns exactly.

Every theme is checked for contrast before you see it, so key labels always read clearly. Want even more? Turn on Accessible themes for 7:1 contrast. Found one you love? Lock theme keeps it.

Before the swipe: Calsee in Porcelain Morning, a light neumorphic theme, showing 15,000 + 2,480 with the preview 17,480. After the swipe: the same sum, 15,000 + 2,480 with the preview 17,480, in Midnight Lens, a dark Liquid Glass theme.
Swipe. The theme changes; your sum stays put.

  • Material 3 Expressive

    Tonal colour and bold type. Keys are circles, pills and squircles, with cookie and clover operators that morph as you press.

    Press
    Corners squeeze, the key springs back
    Sound
    Soft tap
    A mint and teal Material 3 Expressive theme. A plum Material 3 Expressive theme with cookie-shaped operator keys.

  • NeoPOP

    A dark base, flat saturated colour and hard extruded edges. Keys physically drop into the case when you press them.

    Press
    Moves down 3–5 dp, no tint
    Sound
    Pop
    A NeoPOP theme with pink operators and an orange equals key. A NeoPOP theme with yellow-green operators and an orange equals key.

  • Retro hardware

    Beige desk and black pocket calculators with real keycap travel, and a seven-segment display: a classic LCD, or a vacuum-fluorescent tube that glows.

    Press
    Bevels flip, a mechanical tick on release
    Sound
    Retro beep or mechanical clicky
    A retro theme with a cyan VFD display. A beige desk calculator theme with a green LCD. A black pocket calculator theme with a grey LCD.

  • Neumorphism

    Soft, sculpted keys pressed out of one surface, tuned to pass the contrast checks that classic neumorphism fails.

    Press
    The shadow flips inward
    Sound
    Tick
    A light neumorphic theme in cream. A dark neumorphic theme in slate blue.

  • Liquid Glass

    Translucent keys float over a slowly drifting colour mesh, each with a specular highlight and a light-catching rim. Dark smoky glass or milky light glass.

    Press
    The key inflates and glows, then wobbles back like jelly
    Sound
    Glass
    Ember Lagoon, a Liquid Glass theme with brown glass keys and teal operators over a warm mesh. Morning Prism, a light Liquid Glass theme with milky keys on a pastel mesh.

  • Neo-brutalism

    Flat paper or bold poster colours, thick ink outlines and hard, unblurred shadows. Operators in loud, saturated flat colour.

    Press
    The key slides into its own shadow
    Sound
    Mechanical (linear)
    Bubblegum Poster, a Neo-brutalism theme on dotted cream paper with pink operators and black outlines. Midnight Rivet, a dark Neo-brutalism theme with cream outlines and lime operators.

0.1 + 0.2 = 0.3. Exactly.

Most software does sums in binary floating point, which can’t store 0.1 exactly, so stray digits creep in. Calsee keeps every number as an exact fraction and only falls back to 40 significant digits when it has to. Your answer never touches floating point.

It also shows a live result as you type, lets you move the cursor to fix one digit, and handles brackets and percent the way you’d expect.

  1. 0.1 + 0.2= 0.3Floating point says 0.30000000000000004
  2. 1.1 × 1.1= 1.21Floating point says 1.2100000000000002
  3. 0.3 − 0.1= 0.2Floating point says 0.19999999999999998
  4. 1 ÷ 3 × 3= 1One third stays one third, so it comes back to exactly 1

Big numbers, written out.

Under every result, Calsee writes the amount in words: “≈ 12.35 crore” at a glance, every word with a tap. Lakh and crore or million and billion, in English or Hindi. Try it.

123456789

Lakh and crore
12,34,56,789
≈ 12.35 crore
twelve crore thirty-four lakh fifty-six thousand seven hundred eighty-nine
Million and billion
123,456,789
≈ 123.46 million
one hundred twenty-three million four hundred fifty-six thousand seven hundred eighty-nine
हिन्दी
12,34,56,789
≈ 12.35 करोड़
बारह करोड़ चौंतीस लाख छप्पन हज़ार सात सौ नवासी
Calsee showing 1,23,45,67,890 with the amount written out in Hindi under the result. A retro LCD theme showing the amount written out in English words.
  • “≈” means the words are rounded. No “≈”, no rounding.
  • Tap the line to switch between short and full words; long-press to copy it.
  • History rows keep the short amount, too.

Every key has a sound.

Eleven sound packs, from mechanical switches to a 90s calculator beep. Each theme brings a matching pack, or you pick one and keep it. Sounds follow your phone’s silent switch, and the haptics change with the theme too.

Sound pack

Packs: soft tap, mechanical linear, tactile and clicky, typewriter, retro beep, pop, wood, chiptune, glass and tick.

0

These are the app’s own sound files. Turn your volume up.

And everything a good calculator needs.

History you control
Saved on your phone for as long as you choose, searchable, one tap to reuse. Or don’t save it at all.
Number formats
Indian lakh and crore grouping, or international commas.
One-handed mode
Moves the keypad toward one thumb on wide phones.
Reduce motion
Themes fade instead of moving.
Haptics
A light tick on every key, tuned to each theme family. Off with one switch.
Keyboard on desktop
Type sums on a real keyboard; ] and [ change the theme.
The Calsee history panel listing past sums with their results and short amounts in words.

Nothing you type leaves your phone.

  • No accountOpen it and start calculating.
  • No ads, analytics or trackingNo crash reporting or advertising ID either.
  • Works offlineCalsee makes no network requests. On Android it doesn’t even ask for internet access.
  • Your history stays yoursKept only on your device. Clear it any time; uninstalling removes everything.
Read the privacy policy

This website follows the same rule: no cookies, no analytics, nothing loaded from anyone else.

The Calsee app icon.

Calsee is almost here.

Coming first to Android phones, iPhone and iPad. Versions for macOS, Windows and Linux are in the works.

Coming soon toGoogle Play Coming soon to theApp Store

Coming in later updates: scientific functions, a unit and currency converter, and sharing your favourite themes with a link.