#2A3757
Closest named color: Prussian Blue (#1D3557). oklch(34.1% 0.059 266.5), rgb(42, 55, 87).
Aa
White text reads best on this color (11.78:1).
About this color
#2A3757 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.059 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 11.78:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.78:1 |
| White text | 11.78:1 |
Values
| HEX | #2A3757 |
| RGB | rgb(42, 55, 87) |
| HSL | hsl(223, 35%, 25%) |
| OKLCH | oklch(34.1% 0.059 266.5) |
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 #2A3757 | 11.78:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #2A3757 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #2A3757 text on white | 11.78:1 | AAA | Lc 97.0 | Preferred for body text |
| #2A3757 text on black | 1.78:1 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B3C1DE
oklch(81% 0.044 264.9)
-
Step 400
400
#8CA0CE
oklch(70.7% 0.071 266.3)
-
Step 500
500
#7088C1
oklch(63.1% 0.091 266.3)
-
Step 600
600
#5971AD
oklch(55.6% 0.098 266.7)
-
Step 700
700
#495E95
oklch(49% 0.092 267.1)
-
Step 800
800
#3C4D79
oklch(42.7% 0.077 267.1)
-
Step 900
900 (this color)
#2A3757
oklch(34.1% 0.059 266.5)
-
Step 950
950
#1E2639
oklch(27% 0.037 266.4)
#2A3757 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) | #2B3A58 | 0.010 |
| Deuteranopia (no green cones) | #263656 | 0.007 |
| Tritanopia (no blue cones) | #183E43 | 0.053 |
| Achromatopsia (no color) | #383838 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3757
#2A3757
oklch(34.1% 0.059 266.5)
- #46360E
#46360E
oklch(34.2% 0.06 86.4)
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 #2A3757, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Dark Blue Grey #1F3B4D ΔE 0.028
- Gunmetal #293241 ΔE 0.039
- Midnight Green #073B4C ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.043
- Marine Blue #01386A ΔE 0.047
- Onyx #343A40 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.047
Use #2A3757 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.