#2F3B83
Closest named color: Cobalt (#1E488F). oklch(38.5% 0.121 272.3), rgb(47, 59, 131).
Aa
White text reads best on this color (10.12:1).
About this color
#2F3B83 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.121 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.040 away. White text reads best on it, at 10.12:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #2F3B83 |
| RGB | rgb(47, 59, 131) |
| HSL | hsl(231, 47%, 35%) |
| OKLCH | oklch(38.5% 0.121 272.3) |
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 #2F3B83 | 10.12:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #2F3B83 | 2.07:1 | Fails | Lc 10.7 | Not readable |
| #2F3B83 text on white | 10.12:1 | AAA | Lc 93.2 | Preferred for body text |
| #2F3B83 text on black | 2.07:1 | Fails | Lc -9.3 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ACBDFC
oklch(80.8% 0.091 272.6)
-
Step 400
400
#8299FB
oklch(70.8% 0.146 272.2)
-
Step 500
500
#657CF8
oklch(63.2% 0.186 272.1)
-
Step 600
600
#4F61E7
oklch(55.6% 0.202 272.2)
-
Step 700
700
#414FC9
oklch(49.2% 0.188 272.4)
-
Step 800
800
#3542A2
oklch(42.8% 0.155 272.3)
-
Step 900
900 (this color)
#2F3B83
oklch(38.5% 0.121 272.3)
-
Step 950
950
#1A224B
oklch(27% 0.076 272.1)
#2F3B83 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) | #0D4586 | 0.037 |
| Deuteranopia (no green cones) | #003E82 | 0.038 |
| Tritanopia (no blue cones) | #004C59 | 0.103 |
| Achromatopsia (no color) | #424242 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3B83
#2F3B83
oklch(38.5% 0.121 272.3)
- #524200
#524200
oklch(38.5% 0.079 93.2)
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 #2F3B83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.040
- Twilight Blue #0A437A ΔE 0.041
- Dark Slate Blue #483D8B ΔE 0.042
- Blueberry #464196 ΔE 0.050
- Light Navy #155084 ΔE 0.060
- Marine Blue #01386A ΔE 0.062
- Dusk Blue #26538D ΔE 0.067
- Sapphire #2138AB ΔE 0.068
Use #2F3B83 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.