#21374E
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33% 0.05 250.6), rgb(33, 55, 78).
Aa
White text reads best on this color (12.20:1).
About this color
#21374E is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.050 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.014 away. White text reads best on it, at 12.20:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.72:1 |
| White text | 12.20:1 |
Values
| HEX | #21374E |
| RGB | rgb(33, 55, 78) |
| HSL | hsl(211, 41%, 22%) |
| OKLCH | oklch(33% 0.05 250.6) |
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 #21374E | 12.20:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #21374E | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #21374E text on white | 12.20:1 | AAA | Lc 97.8 | Preferred for body text |
| #21374E text on black | 1.72:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EBF1
oklch(93.7% 0.01 247.9)
-
Step 200
200
#CFDAE7
oklch(88.4% 0.022 252.5)
-
Step 300
300
#AFC3D8
oklch(80.9% 0.037 249.6)
-
Step 400
400
#85A4C5
oklch(70.7% 0.059 250.3)
-
Step 500
500
#668DB6
oklch(63.1% 0.076 250.3)
-
Step 600
600
#4D77A2
oklch(55.7% 0.082 250)
-
Step 700
700
#3E648B
oklch(49.2% 0.076 250.2)
-
Step 800
800
#335171
oklch(42.6% 0.064 251)
-
Step 900
900 (this color)
#21374E
oklch(33% 0.05 250.6)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#21374E 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) | #2E384F | 0.019 |
| Deuteranopia (no green cones) | #28334E | 0.015 |
| Tritanopia (no blue cones) | #083C3F | 0.043 |
| Achromatopsia (no color) | #353535 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21374E
#21374E
oklch(33% 0.05 250.6)
- #453117
#453117
oklch(33% 0.049 71.9)
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 #21374E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.014
- Prussian Blue #1D3557 ΔE 0.019
- Midnight Green #073B4C ΔE 0.025
- Gunmetal #293241 ΔE 0.025
- Space Cadet #2B2D42 ΔE 0.035
- Onyx #343A40 ΔE 0.040
- Charcoal #264653 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.052
Use #21374E 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.