#2B3F99
Closest named color: Cobalt (#1E488F). oklch(40.9% 0.149 269.2), rgb(43, 63, 153).
Aa
White text reads best on this color (9.23:1).
About this color
#2B3F99 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.149 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.031 away. White text reads best on it, at 9.23:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #2B3F99 |
| RGB | rgb(43, 63, 153) |
| HSL | hsl(229, 56%, 38%) |
| OKLCH | oklch(40.9% 0.149 269.2) |
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 #2B3F99 | 9.23:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #2B3F99 | 2.27:1 | Fails | Lc 13.1 | Not readable |
| #2B3F99 text on white | 9.23:1 | AAA | Lc 90.8 | Preferred for body text |
| #2B3F99 text on black | 2.27:1 | Fails | Lc -11.5 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9FA
oklch(88.6% 0.048 268.4)
-
Step 300
300
#AABFFA
oklch(81% 0.087 269.2)
-
Step 400
400
#7E9BF7
oklch(70.7% 0.139 269.4)
-
Step 500
500
#5F7FF4
oklch(63.1% 0.178 269.3)
-
Step 600
600
#4865E2
oklch(55.6% 0.192 269.3)
-
Step 700
700
#3A53C5
oklch(49.2% 0.18 269.3)
-
Step 800
800 (this color)
#2B3F99
oklch(40.9% 0.149 269.2)
-
Step 900
900
#293B7E
oklch(37.7% 0.115 269)
-
Step 950
950
#18234A
oklch(27% 0.074 269.2)
#2B3F99 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) | #004D9C | 0.041 |
| Deuteranopia (no green cones) | #004297 | 0.029 |
| Tritanopia (no blue cones) | #005565 | 0.120 |
| Achromatopsia (no color) | #474747 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3F99
#2B3F99
oklch(40.9% 0.149 269.2)
- #5C4700
#5C4700
oklch(40.9% 0.084 89.3)
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 #2B3F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.031
- Sapphire #2138AB ΔE 0.036
- Blueberry #464196 ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.047
- Dusk Blue #26538D ΔE 0.060
- Twilight Blue #0A437A ΔE 0.061
- Light Navy #155084 ΔE 0.063
- Blue Blue #2242C7 ΔE 0.074
Use #2B3F99 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.