#2F409C
Closest named color: Cobalt (#1E488F). oklch(41.5% 0.15 270.5), rgb(47, 64, 156).
Aa
White text reads best on this color (8.99:1).
About this color
#2F409C is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.150 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.034 away. White text reads best on it, at 8.99:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #2F409C |
| RGB | rgb(47, 64, 156) |
| HSL | hsl(231, 54%, 40%) |
| OKLCH | oklch(41.5% 0.15 270.5) |
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 #2F409C | 8.99:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #2F409C | 2.33:1 | Fails | Lc 13.8 | Not readable |
| #2F409C text on white | 8.99:1 | AAA | Lc 90.2 | Preferred for body text |
| #2F409C text on black | 2.33:1 | Fails | Lc -12.1 | 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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ABBEFA
oklch(80.9% 0.088 270.8)
-
Step 400
400
#809AF8
oklch(70.7% 0.141 270.8)
-
Step 500
500
#627EF5
oklch(63.2% 0.18 270.5)
-
Step 600
600
#4B63E3
oklch(55.5% 0.195 270.7)
-
Step 700
700
#3D51C6
oklch(49.1% 0.183 270.7)
-
Step 800
800 (this color)
#2F409C
oklch(41.5% 0.15 270.5)
-
Step 900
900
#2B3A7F
oklch(37.7% 0.118 270.6)
-
Step 950
950
#19234A
oklch(27.1% 0.073 270.1)
#2F409C 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) | #004E9F | 0.042 |
| Deuteranopia (no green cones) | #00449A | 0.033 |
| Tritanopia (no blue cones) | #005767 | 0.124 |
| Achromatopsia (no color) | #494949 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F409C
#2F409C
oklch(41.5% 0.15 270.5)
- #5D4900
#5D4900
oklch(41.5% 0.085 90.7)
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 #2F409C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.034
- Blueberry #464196 ΔE 0.034
- Sapphire #2138AB ΔE 0.036
- Dark Slate Blue #483D8B ΔE 0.045
- Dusk Blue #26538D ΔE 0.059
- Light Navy #155084 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.067
- Blue Blue #2242C7 ΔE 0.070
Use #2F409C 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.