#2F3F79
Closest named color: Twilight Blue (#0A437A). oklch(38.6% 0.1 269.6), rgb(47, 63, 121).
Aa
White text reads best on this color (9.96:1).
About this color
#2F3F79 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.100 and its hue 270°. 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 9.96:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.96:1 |
Values
| HEX | #2F3F79 |
| RGB | rgb(47, 63, 121) |
| HSL | hsl(227, 44%, 33%) |
| OKLCH | oklch(38.6% 0.1 269.6) |
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 #2F3F79 | 9.96:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #2F3F79 | 2.10:1 | Fails | Lc 11.0 | Not readable |
| #2F3F79 text on white | 9.96:1 | AAA | Lc 92.9 | Preferred for body text |
| #2F3F79 text on black | 2.10:1 | Fails | Lc -9.5 | 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 900.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F6
oklch(88.6% 0.042 269)
-
Step 300
300
#ADBFF2
oklch(80.9% 0.075 269.5)
-
Step 400
400
#839CEC
oklch(70.7% 0.121 269.9)
-
Step 500
500
#6582E6
oklch(63.2% 0.154 269.5)
-
Step 600
600
#4E69D4
oklch(55.7% 0.167 269.6)
-
Step 700
700
#3F56B8
oklch(49% 0.157 269.8)
-
Step 800
800
#344795
oklch(42.7% 0.13 269.8)
-
Step 900
900 (this color)
#2F3F79
oklch(38.6% 0.1 269.6)
-
Step 950
950
#1A2445
oklch(27% 0.063 269.2)
#2F3F79 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) | #24467B | 0.022 |
| Deuteranopia (no green cones) | #193F78 | 0.024 |
| Tritanopia (no blue cones) | #004C56 | 0.088 |
| Achromatopsia (no color) | #434343 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3F79
#2F3F79
oklch(38.6% 0.1 269.6)
- #544100
#544100
oklch(38.5% 0.079 89.8)
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 #2F3F79, 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 0.043
- Dark Slate Blue #483D8B ΔE 0.049
- Light Navy #155084 ΔE 0.051
- Marine Blue #01386A ΔE 0.055
- Blueberry #464196 ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.061
- Dusk Blue #26538D ΔE 0.061
Use #2F3F79 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.