#0051B1
Closest named color: Blue Blue (#2242C7). oklch(45.5% 0.167 257.9), rgb(0, 81, 177).
Aa
White text reads best on this color (7.46:1).
About this color
#0051B1 is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.167 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.050 away. White text reads best on it, at 7.46:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.81:1 |
| White text | 7.46:1 |
Values
| HEX | #0051B1 |
| RGB | rgb(0, 81, 177) |
| HSL | hsl(213, 100%, 35%) |
| OKLCH | oklch(45.5% 0.167 257.9) |
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 #0051B1 | 7.46:1 | AAA | Lc -90.0 | Preferred for body text |
| Black text on #0051B1 | 2.81:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #0051B1 text on white | 7.46:1 | AAA | Lc 85.1 | Fine for body text |
| #0051B1 text on black | 2.81:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFE
oklch(88.5% 0.055 257.7)
-
Step 300
300
#9AC3FF
oklch(81% 0.096 257.8)
-
Step 400
400
#60A1FF
oklch(70.8% 0.154 257.7)
-
Step 500
500
#2C85FF
oklch(63.1% 0.2 257.8)
-
Step 600
600
#006CE7
oklch(55.5% 0.204 257.8)
-
Step 700
700
#005BC4
oklch(49.2% 0.18 257.7)
-
Step 800
800 (this color)
#0051B1
oklch(45.5% 0.167 257.9)
-
Step 900
900
#073E85
oklch(37.7% 0.131 257.9)
-
Step 950
950
#08254E
oklch(27% 0.083 258)
#0051B1 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) | #005DB4 | 0.032 |
| Deuteranopia (no green cones) | #004EAF | 0.008 |
| Tritanopia (no blue cones) | #006979 | 0.126 |
| Achromatopsia (no color) | #555555 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0051B1
#0051B1
oklch(45.5% 0.167 257.9)
- #734F00
#734F00
oklch(45.5% 0.095 78.4)
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 #0051B1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.050
- Cobalt #1E488F ΔE 0.058
- Sapphire #2138AB ΔE 0.059
- Dusk Blue #26538D ΔE 0.061
- Denim Blue #3B5B92 ΔE 0.073
- Light Navy #155084 ΔE 0.073
- Mid Blue #276AB3 ΔE 0.075
- Blueberry #464196 ΔE 0.075
Use #0051B1 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.