#1273D8
Closest named color: Cerulean Blue (#056EEE). oklch(56.1% 0.175 254.9), rgb(18, 115, 216).
Aa
White text reads best on this color (4.69:1).
About this color
#1273D8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.175 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.037 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.46:1 |
| White text | 4.69:1 |
Values
| HEX | #1273D8 |
| RGB | rgb(18, 115, 216) |
| HSL | hsl(211, 85%, 46%) |
| OKLCH | oklch(56.1% 0.175 254.9) |
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 #1273D8 | 4.69:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #1273D8 | 4.46:1 | AA large text | Lc 32.1 | Non-text elements, placeholder text |
| #1273D8 text on white | 4.69:1 | AA | Lc 72.0 | Content text, not long reading |
| #1273D8 text on black | 4.46:1 | AA large text | Lc -29.7 | Dividers and decoration only |
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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9EC4F3
oklch(80.9% 0.078 254)
-
Step 400
400
#68A3EE
oklch(70.7% 0.127 255.1)
-
Step 500
500
#3B8AE8
oklch(63.1% 0.161 254.8)
-
Step 600
600 (this color)
#1273D8
oklch(56.1% 0.175 254.9)
-
Step 700
700
#005FB9
oklch(49.2% 0.161 254.8)
-
Step 800
800
#074E96
oklch(42.8% 0.134 254.6)
-
Step 900
900
#124178
oklch(37.6% 0.106 255.1)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#1273D8 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) | #397DDC | 0.038 |
| Deuteranopia (no green cones) | #006CD6 | 0.020 |
| Tritanopia (no blue cones) | #008C9B | 0.132 |
| Achromatopsia (no color) | #747474 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1273D8
#1273D8
oklch(56.1% 0.175 254.9)
- #9D6900
#9D6900
oklch(56.2% 0.119 74.9)
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 #1273D8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.037
- Royal Blue #4169E1 ΔE 0.039
- Windows Blue #3778BF ΔE 0.047
- Mid Blue #276AB3 ΔE 0.059
- Clear Blue #247AFD ΔE 0.059
- Water Blue #0E87CC ΔE 0.061
- Neon Blue #4361EE ΔE 0.062
- Azul #1D5DEC ΔE 0.063
Use #1273D8 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.