#21455D
Closest named color: Dark Grey Blue (#29465B). oklch(37.5% 0.059 240), rgb(33, 69, 93).
Aa
White text reads best on this color (10.12:1).
About this color
#21455D is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.059 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.010 away. White text reads best on it, at 10.12:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #21455D |
| RGB | rgb(33, 69, 93) |
| HSL | hsl(204, 48%, 25%) |
| OKLCH | oklch(37.5% 0.059 240) |
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 #21455D | 10.12:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #21455D | 2.07:1 | Fails | Lc 10.6 | Not readable |
| #21455D text on white | 10.12:1 | AAA | Lc 93.4 | Preferred for body text |
| #21455D text on black | 2.07:1 | Fails | Lc -9.1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CBDCE8
oklch(88.5% 0.025 238.4)
-
Step 300
300
#A8C5DB
oklch(80.9% 0.044 240.9)
-
Step 400
400
#78A7C8
oklch(70.7% 0.07 239.6)
-
Step 500
500
#5391BA
oklch(63.2% 0.089 239.3)
-
Step 600
600
#357AA7
oklch(55.6% 0.098 240.5)
-
Step 700
700
#27678F
oklch(49.2% 0.091 239.9)
-
Step 800
800
#225474
oklch(42.7% 0.075 240)
-
Step 900
900 (this color)
#21455D
oklch(37.5% 0.059 240)
-
Step 950
950
#142937
oklch(27% 0.038 239.4)
#21455D 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) | #3A455E | 0.031 |
| Deuteranopia (no green cones) | #323F5D | 0.026 |
| Tritanopia (no blue cones) | #004B4D | 0.044 |
| Achromatopsia (no color) | #424242 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21455D
#21455D
oklch(37.5% 0.059 240)
- #58391F
#58391F
oklch(37.5% 0.059 59.5)
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 #21455D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.010
- Charcoal #264653 ΔE 0.019
- Dark Blue Grey #1F3B4D ΔE 0.038
- Dark Teal #014D4E ΔE 0.047
- Midnight Green #073B4C ΔE 0.048
- Dark Slate Gray #2F4F4F ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.052
- Charcoal Grey #3C4142 ΔE 0.053
Use #21455D 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.