#2B4599
Closest named color: Cobalt (#1E488F). oklch(42.1% 0.141 267.1), rgb(43, 69, 153).
Aa
White text reads best on this color (8.69:1).
About this color
#2B4599 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.141 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.022 away. White text reads best on it, at 8.69:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.41:1 |
| White text | 8.69:1 |
Values
| HEX | #2B4599 |
| RGB | rgb(43, 69, 153) |
| HSL | hsl(226, 56%, 38%) |
| OKLCH | oklch(42.1% 0.141 267.1) |
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 #2B4599 | 8.69:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #2B4599 | 2.41:1 | Fails | Lc 14.5 | Not readable |
| #2B4599 text on white | 8.69:1 | AAA | Lc 89.4 | Fine for body text |
| #2B4599 text on black | 2.41:1 | Fails | Lc -12.8 | 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 800.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F8
oklch(88.5% 0.045 267.4)
-
Step 300
300
#A9C0F7
oklch(81% 0.082 266.9)
-
Step 400
400
#7C9DF3
oklch(70.8% 0.132 267.1)
-
Step 500
500
#5C82EE
oklch(63.2% 0.167 267)
-
Step 600
600
#4468DD
oklch(55.6% 0.183 267.3)
-
Step 700
700
#3656C0
oklch(49.2% 0.17 267.1)
-
Step 800
800 (this color)
#2B4599
oklch(42.1% 0.141 267.1)
-
Step 900
900
#273C7B
oklch(37.6% 0.11 267.1)
-
Step 950
950
#172448
oklch(27% 0.069 266.8)
#2B4599 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) | #03509C | 0.034 |
| Deuteranopia (no green cones) | #004697 | 0.028 |
| Tritanopia (no blue cones) | #005968 | 0.113 |
| Achromatopsia (no color) | #4B4B4B | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4599
#2B4599
oklch(42.1% 0.141 267.1)
- #614900
#614900
oklch(41.9% 0.086 87)
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 #2B4599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.022
- Blueberry #464196 ΔE 0.036
- Sapphire #2138AB ΔE 0.046
- Dusk Blue #26538D ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.047
- Light Navy #155084 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.064
Use #2B4599 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.