#2F407C
Closest named color: Twilight Blue (#0A437A). oklch(39% 0.104 269.3), rgb(47, 64, 124).
Aa
White text reads best on this color (9.78:1).
About this color
#2F407C is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.104 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 9.78:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.14:1 |
| White text | 9.78:1 |
Values
| HEX | #2F407C |
| RGB | rgb(47, 64, 124) |
| HSL | hsl(227, 45%, 34%) |
| OKLCH | oklch(39% 0.104 269.3) |
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 #2F407C | 9.78:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #2F407C | 2.14:1 | Fails | Lc 11.5 | Not readable |
| #2F407C text on white | 9.78:1 | AAA | Lc 92.5 | Preferred for body text |
| #2F407C text on black | 2.14:1 | Fails | Lc -9.9 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CDD9F7
oklch(88.6% 0.043 268.2)
-
Step 300
300
#ACBFF4
oklch(80.9% 0.078 269.3)
-
Step 400
400
#819CEE
oklch(70.6% 0.124 269.2)
-
Step 500
500
#6381E9
oklch(63.1% 0.16 269.3)
-
Step 600
600
#4C68D7
oklch(55.6% 0.173 269.4)
-
Step 700
700
#3D56BA
oklch(49.1% 0.16 269.2)
-
Step 800
800
#324797
oklch(42.7% 0.133 269)
-
Step 900
900 (this color)
#2F407C
oklch(39% 0.104 269.3)
-
Step 950
950
#1A2446
oklch(27.1% 0.065 269.4)
#2F407C 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) | #23477E | 0.022 |
| Deuteranopia (no green cones) | #17407B | 0.025 |
| Tritanopia (no blue cones) | #004E58 | 0.091 |
| Achromatopsia (no color) | #444444 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F407C
#2F407C
oklch(39% 0.104 269.3)
- #564200
#564200
oklch(39% 0.08 89.1)
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 #2F407C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Cobalt #1E488F ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.046
- Light Navy #155084 ΔE 0.048
- Blueberry #464196 ΔE 0.056
- Dusk Blue #26538D ΔE 0.057
- Marine Blue #01386A ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.061
Use #2F407C 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.