#1C75DD
Closest named color: Cerulean Blue (#056EEE). oklch(57% 0.178 255.9), rgb(28, 117, 221).
Aa
Black text reads best on this color (4.63:1).
About this color
#1C75DD is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.178 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.034 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.63:1 |
| White text | 4.52:1 |
Values
| HEX | #1C75DD |
| RGB | rgb(28, 117, 221) |
| HSL | hsl(212, 78%, 49%) |
| OKLCH | oklch(57% 0.178 255.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #1C75DD | 4.52:1 | AA | Lc -76.3 | Fine for body text |
| Black text on #1C75DD | 4.63:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #1C75DD text on white | 4.52:1 | AA | Lc 70.8 | Content text, not long reading |
| #1C75DD text on black | 4.63:1 | AA | Lc -30.8 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9FC3F4
oklch(80.8% 0.08 256.2)
-
Step 400
400
#69A3EF
oklch(70.8% 0.128 255.7)
-
Step 500
500
#3D89EA
oklch(63.1% 0.164 256)
-
Step 600
600 (this color)
#1C75DD
oklch(57% 0.178 255.9)
-
Step 700
700
#035DBB
oklch(49% 0.166 256)
-
Step 800
800
#0B4D98
oklch(42.8% 0.137 256)
-
Step 900
900
#144179
oklch(37.8% 0.107 256)
-
Step 950
950
#0D2647
oklch(26.9% 0.069 256.4)
#1C75DD with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #397FE1 | 0.035 |
| Deuteranopia (no green cones) | #006EDB | 0.022 |
| Tritanopia (no blue cones) | #008E9E | 0.134 |
| Achromatopsia (no color) | #767676 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C75DD
#1C75DD
oklch(57% 0.178 255.9)
- #9F6C00
#9F6C00
oklch(57% 0.12 76.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #1C75DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.034
- Royal Blue #4169E1 ΔE 0.036
- Clear Blue #247AFD ΔE 0.050
- Windows Blue #3778BF ΔE 0.050
- Neon Blue #4361EE ΔE 0.059
- Water Blue #0E87CC ΔE 0.059
- Bright Blue #0165FC ΔE 0.064
- Azul #1D5DEC ΔE 0.064
Use #1C75DD in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.