#0457BB
Closest named color: Blue Blue (#2242C7). oklch(47.7% 0.173 257.9), rgb(4, 87, 187).
Aa
White text reads best on this color (6.80:1).
About this color
#0457BB is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.173 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.052 away. White text reads best on it, at 6.80:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.08:1 |
| White text | 6.80:1 |
Values
| HEX | #0457BB |
| RGB | rgb(4, 87, 187) |
| HSL | hsl(213, 96%, 37%) |
| OKLCH | oklch(47.7% 0.173 257.9) |
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 #0457BB | 6.80:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #0457BB | 3.08:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #0457BB text on white | 6.80:1 | AA | Lc 82.7 | Fine for body text |
| #0457BB text on black | 3.08:1 | AA large text | Lc -19.2 | 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 700.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#9FC3F7
oklch(81% 0.084 257.5)
-
Step 400
400
#6AA1F3
oklch(70.6% 0.134 258.2)
-
Step 500
500
#4087EE
oklch(63% 0.171 258)
-
Step 600
600
#1C6EDD
oklch(55.5% 0.186 258)
-
Step 700
700 (this color)
#0457BB
oklch(47.7% 0.173 257.9)
-
Step 800
800
#104B9B
oklch(42.6% 0.143 258.1)
-
Step 900
900
#16407B
oklch(37.7% 0.111 257.8)
-
Step 950
950
#0E2648
oklch(27% 0.07 257.6)
#0457BB 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) | #0063BF | 0.032 |
| Deuteranopia (no green cones) | #0054B9 | 0.009 |
| Tritanopia (no blue cones) | #007080 | 0.131 |
| Achromatopsia (no color) | #5B5B5B | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0457BB
#0457BB
oklch(47.7% 0.173 257.9)
- #7B5400
#7B5400
oklch(47.6% 0.099 77.7)
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 #0457BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.052
- Mid Blue #276AB3 ΔE 0.060
- Dusk Blue #26538D ΔE 0.074
- Warm Blue #4B57DB ΔE 0.076
- Denim Blue #3B5B92 ΔE 0.076
- Sapphire #2138AB ΔE 0.077
- Majorelle Blue #3F37C9 ΔE 0.078
- Cobalt #1E488F ΔE 0.078
Use #0457BB 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.