#1273E8
Closest named color: Cerulean Blue (#056EEE). oklch(57.3% 0.196 257.2), rgb(18, 115, 232).
Aa
Black text reads best on this color (4.64:1).
About this color
#1273E8 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.196 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.017 away. Black text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.64:1 |
| White text | 4.52:1 |
Values
| HEX | #1273E8 |
| RGB | rgb(18, 115, 232) |
| HSL | hsl(213, 86%, 49%) |
| OKLCH | oklch(57.3% 0.196 257.2) |
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 #1273E8 | 4.52:1 | AA | Lc -76.1 | Fine for body text |
| Black text on #1273E8 | 4.64:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #1273E8 text on white | 4.52:1 | AA | Lc 70.7 | Content text, not long reading |
| #1273E8 text on black | 4.64:1 | AA | Lc -31.0 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9DC3FA
oklch(81% 0.088 257.6)
-
Step 400
400
#65A2F7
oklch(70.8% 0.14 256.9)
-
Step 500
500
#3787F3
oklch(63% 0.18 257.1)
-
Step 600
600 (this color)
#1273E8
oklch(57.3% 0.196 257.2)
-
Step 700
700
#005CC1
oklch(49.2% 0.175 257.1)
-
Step 800
800
#034B9F
oklch(42.7% 0.151 257.2)
-
Step 900
900
#10407E
oklch(37.8% 0.117 257)
-
Step 950
950
#0B264A
oklch(27.1% 0.074 256.8)
#1273E8 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) | #2280EC | 0.036 |
| Deuteranopia (no green cones) | #006EE6 | 0.015 |
| Tritanopia (no blue cones) | #0090A3 | 0.147 |
| Achromatopsia (no color) | #767676 | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1273E8
#1273E8
oklch(57.3% 0.196 257.2)
- #9F6D00
#9F6D00
oklch(57.2% 0.12 77)
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 #1273E8, closest first.
No curated palette has a color within ΔE 0.04 of #1273E8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.017
- Royal Blue #4169E1 ΔE 0.034
- Clear Blue #247AFD ΔE 0.037
- Bright Blue #0165FC ΔE 0.047
- Neon Blue #4361EE ΔE 0.049
- Azul #1D5DEC ΔE 0.053
- Windows Blue #3778BF ΔE 0.068
- Warm Blue #4B57DB ΔE 0.072
Use #1273E8 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.