#0251AA
Closest named color: Cobalt (#1E488F). oklch(45% 0.158 257), rgb(2, 81, 170).
Aa
White text reads best on this color (7.60:1).
About this color
#0251AA is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.158 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.048 away. White text reads best on it, at 7.60:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.76:1 |
| White text | 7.60:1 |
Values
| HEX | #0251AA |
| RGB | rgb(2, 81, 170) |
| HSL | hsl(212, 98%, 34%) |
| OKLCH | oklch(45% 0.158 257) |
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 #0251AA | 7.60:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #0251AA | 2.76:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #0251AA text on white | 7.60:1 | AAA | Lc 85.7 | Fine for body text |
| #0251AA text on black | 2.76:1 | Fails | Lc -16.4 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C4DBFB
oklch(88.5% 0.051 256.7)
-
Step 300
300
#9AC3FC
oklch(80.9% 0.092 256.7)
-
Step 400
400
#61A1FB
oklch(70.6% 0.148 257.2)
-
Step 500
500
#3087F8
oklch(63.2% 0.188 256.8)
-
Step 600
600
#006EE3
oklch(55.7% 0.197 256.9)
-
Step 700
700
#005CC0
oklch(49.1% 0.174 256.9)
-
Step 800
800 (this color)
#0251AA
oklch(45% 0.158 257)
-
Step 900
900
#0A3F81
oklch(37.7% 0.123 257)
-
Step 950
950
#09264B
oklch(27.1% 0.077 256.3)
#0251AA 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) | #0E5BAD | 0.029 |
| Deuteranopia (no green cones) | #004DA8 | 0.011 |
| Tritanopia (no blue cones) | #006775 | 0.119 |
| Achromatopsia (no color) | #545454 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0251AA
#0251AA
oklch(45% 0.158 257)
- #724D00
#724D00
oklch(45% 0.094 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 #0251AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.048
- Dusk Blue #26538D ΔE 0.051
- Blue Blue #2242C7 ΔE 0.059
- Sapphire #2138AB ΔE 0.059
- Light Navy #155084 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.066
- Deep Sea Blue #015482 ΔE 0.068
- Light Navy Blue #2E5A88 ΔE 0.070
Use #0251AA 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.