#2F3B89
Closest named color: Cobalt (#1E488F). oklch(38.9% 0.13 272.3), rgb(47, 59, 137).
Aa
White text reads best on this color (9.96:1).
About this color
#2F3B89 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.130 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.037 away. White text reads best on it, at 9.96:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.10:1 |
| White text | 9.96:1 |
Values
| HEX | #2F3B89 |
| RGB | rgb(47, 59, 137) |
| HSL | hsl(232, 49%, 36%) |
| OKLCH | oklch(38.9% 0.13 272.3) |
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 #2F3B89 | 9.96:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #2F3B89 | 2.10:1 | Fails | Lc 11.2 | Not readable |
| #2F3B89 text on white | 9.96:1 | AAA | Lc 92.8 | Preferred for body text |
| #2F3B89 text on black | 2.10:1 | Fails | Lc -9.7 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FE
oklch(88.5% 0.054 271.5)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8198FF
oklch(70.7% 0.153 272.5)
-
Step 500
500
#637AFF
oklch(63.2% 0.198 272.1)
-
Step 600
600
#4D5EEF
oklch(55.6% 0.216 272.1)
-
Step 700
700
#3F4CD0
oklch(49.1% 0.201 272.2)
-
Step 800
800
#343FA8
oklch(42.7% 0.167 272.5)
-
Step 900
900 (this color)
#2F3B89
oklch(38.9% 0.13 272.3)
-
Step 950
950
#1A214E
oklch(27% 0.083 273)
#2F3B89 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) | #00478C | 0.042 |
| Deuteranopia (no green cones) | #003F87 | 0.037 |
| Tritanopia (no blue cones) | #004E5C | 0.109 |
| Achromatopsia (no color) | #434343 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3B89
#2F3B89
oklch(38.9% 0.13 272.3)
- #544300
#544300
oklch(39% 0.08 92.4)
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 #2F3B89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.040
- Blueberry #464196 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.046
- Sapphire #2138AB ΔE 0.059
- Light Navy #155084 ΔE 0.062
- Dusk Blue #26538D ΔE 0.066
- Marine Blue #01386A ΔE 0.070
Use #2F3B89 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.