#2A317F
Closest named color: Twilight Blue (#0A437A). oklch(35.8% 0.13 273.9), rgb(42, 49, 127).
Aa
White text reads best on this color (11.38:1).
About this color
#2A317F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.130 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.054 away. White text reads best on it, at 11.38:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.84:1 |
| White text | 11.38:1 |
Values
| HEX | #2A317F |
| RGB | rgb(42, 49, 127) |
| HSL | hsl(235, 50%, 33%) |
| OKLCH | oklch(35.8% 0.13 273.9) |
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 #2A317F | 11.38:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #2A317F | 1.84:1 | Fails | Lc 8.0 | Not readable |
| #2A317F text on white | 11.38:1 | AAA | Lc 95.9 | Preferred for body text |
| #2A317F text on black | 1.84:1 | Fails | Lc 0.0 | 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
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CDD7FE
oklch(88.4% 0.055 273.9)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8497FF
oklch(70.7% 0.153 274)
-
Step 500
500
#6778FF
oklch(63% 0.199 273.8)
-
Step 600
600
#525CEF
oklch(55.6% 0.217 273.9)
-
Step 700
700
#434AD0
oklch(49% 0.202 273.8)
-
Step 800
800
#373EA8
oklch(42.7% 0.167 274)
-
Step 900
900 (this color)
#2A317F
oklch(35.8% 0.13 273.9)
-
Step 950
950
#1B214E
oklch(27.1% 0.082 273.9)
#2A317F 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) | #003E82 | 0.043 |
| Deuteranopia (no green cones) | #00367D | 0.036 |
| Tritanopia (no blue cones) | #004453 | 0.107 |
| Achromatopsia (no color) | #3A3A3A | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A317F
#2A317F
oklch(35.8% 0.13 273.9)
- #493B00
#493B00
oklch(35.7% 0.073 93.9)
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 #2A317F, closest first.
No curated palette has a color within ΔE 0.04 of #2A317F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.054
- Marine Blue #01386A ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.063
- Cobalt #1E488F ΔE 0.064
- Marine #042E60 ΔE 0.069
- Midnight Blue #191970 ΔE 0.071
- Blueberry #464196 ΔE 0.073
- Royal #0C1793 ΔE 0.074
Use #2A317F 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.