#1C51AE
Closest named color: Blue Blue (#2242C7). oklch(45.7% 0.159 260.8), rgb(28, 81, 174).
Aa
White text reads best on this color (7.40:1).
About this color
#1C51AE is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.159 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.053 away. White text reads best on it, at 7.40:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.83:1 |
| White text | 7.40:1 |
Values
| HEX | #1C51AE |
| RGB | rgb(28, 81, 174) |
| HSL | hsl(218, 72%, 40%) |
| OKLCH | oklch(45.7% 0.159 260.8) |
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 #1C51AE | 7.40:1 | AAA | Lc -90.0 | Preferred for body text |
| Black text on #1C51AE | 2.83:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #1C51AE text on white | 7.40:1 | AAA | Lc 85.2 | Fine for body text |
| #1C51AE text on black | 2.83:1 | Fails | Lc -16.9 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9FC2FD
oklch(81% 0.092 260.7)
-
Step 400
400
#699FFC
oklch(70.6% 0.148 260.7)
-
Step 500
500
#4084FA
oklch(63.2% 0.189 260.6)
-
Step 600
600
#1F69E9
oklch(55.5% 0.207 260.8)
-
Step 700
700
#1257CB
oklch(49.2% 0.192 260.8)
-
Step 800
800 (this color)
#1C51AE
oklch(45.7% 0.159 260.8)
-
Step 900
900
#173D82
oklch(37.6% 0.124 261.1)
-
Step 950
950
#0E254C
oklch(27.1% 0.078 260.3)
#1C51AE 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) | #055CB1 | 0.029 |
| Deuteranopia (no green cones) | #004FAC | 0.015 |
| Tritanopia (no blue cones) | #006877 | 0.123 |
| Achromatopsia (no color) | #555555 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C51AE
#1C51AE
oklch(45.7% 0.159 260.8)
- #725100
#725100
oklch(45.8% 0.095 81.4)
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 #1C51AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.053
- Cobalt #1E488F ΔE 0.054
- Dusk Blue #26538D ΔE 0.055
- Sapphire #2138AB ΔE 0.060
- Denim Blue #3B5B92 ΔE 0.064
- Blueberry #464196 ΔE 0.065
- Light Navy #155084 ΔE 0.069
- Mid Blue #276AB3 ΔE 0.070
Use #1C51AE 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.