#2B457F
Closest named color: Cobalt (#1E488F). oklch(40.1% 0.103 264.1), rgb(43, 69, 127).
Aa
White text reads best on this color (9.29:1).
About this color
#2B457F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.103 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 9.29:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.29:1 |
Values
| HEX | #2B457F |
| RGB | rgb(43, 69, 127) |
| HSL | hsl(221, 49%, 33%) |
| OKLCH | oklch(40.1% 0.103 264.1) |
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 #2B457F | 9.29:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #2B457F | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #2B457F text on white | 9.29:1 | AAA | Lc 91.2 | Preferred for body text |
| #2B457F text on black | 2.26:1 | Fails | Lc -11.1 | Not readable |
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 900.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF6
oklch(88.6% 0.042 263)
-
Step 300
300
#A8C1F3
oklch(81% 0.076 264)
-
Step 400
400
#799FEE
oklch(70.8% 0.124 263.9)
-
Step 500
500
#5884E8
oklch(63% 0.158 264.4)
-
Step 600
600
#3E6CD6
oklch(55.7% 0.171 264)
-
Step 700
700
#3059BA
oklch(49.1% 0.16 264.1)
-
Step 800
800
#294996
oklch(42.6% 0.132 264.5)
-
Step 900
900 (this color)
#2B457F
oklch(40.1% 0.103 264.1)
-
Step 950
950
#162546
oklch(27.1% 0.065 264.1)
#2B457F 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) | #2A4B81 | 0.017 |
| Deuteranopia (no green cones) | #1C437E | 0.017 |
| Tritanopia (no blue cones) | #00525B | 0.087 |
| Achromatopsia (no color) | #474747 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B457F
#2B457F
oklch(40.1% 0.103 264.1)
- #5D4300
#5D4300
oklch(40.1% 0.082 83.4)
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 #2B457F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Twilight Blue #0A437A ΔE 0.030
- Light Navy #155084 ΔE 0.034
- Dusk Blue #26538D ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.050
- Blueberry #464196 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.062
Use #2B457F 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.