#21516D
Closest named color: Deep Sea Blue (#015482). oklch(41.5% 0.07 237.4), rgb(33, 81, 109).
Aa
White text reads best on this color (8.52:1).
About this color
#21516D is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.070 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.036 away. White text reads best on it, at 8.52:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.46:1 |
| White text | 8.52:1 |
Values
| HEX | #21516D |
| RGB | rgb(33, 81, 109) |
| HSL | hsl(202, 54%, 28%) |
| OKLCH | oklch(41.5% 0.07 237.4) |
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 #21516D | 8.52:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #21516D | 2.46:1 | Fails | Lc 14.9 | Not readable |
| #21516D text on white | 8.52:1 | AAA | Lc 89.1 | Fine for body text |
| #21516D text on black | 2.46:1 | Fails | Lc -13.1 | 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 800.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE7
oklch(88.6% 0.023 237.7)
-
Step 300
300
#A9C5D8
oklch(80.9% 0.041 237.7)
-
Step 400
400
#7AA7C5
oklch(70.7% 0.065 238.1)
-
Step 500
500
#5691B6
oklch(63.1% 0.083 237.6)
-
Step 600
600
#387BA2
oklch(55.7% 0.091 237.1)
-
Step 700
700
#2A678B
oklch(49.1% 0.085 238)
-
Step 800
800 (this color)
#21516D
oklch(41.5% 0.07 237.4)
-
Step 900
900
#23465B
oklch(37.8% 0.054 236.9)
-
Step 950
950
#152935
oklch(27% 0.034 236.3)
#21516D 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) | #44516E | 0.040 |
| Deuteranopia (no green cones) | #39496D | 0.033 |
| Tritanopia (no blue cones) | #00585B | 0.047 |
| Achromatopsia (no color) | #4C4C4C | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21516D
#21516D
oklch(41.5% 0.07 237.4)
- #684123
#684123
oklch(41.4% 0.07 56.8)
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 #21516D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.040
- Light Navy #155084 ΔE 0.040
- Deep Teal #00555A ΔE 0.043
- Petrol #005F6A ΔE 0.047
- Charcoal #264653 ΔE 0.049
- YInMn Blue #415A77 ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.050
Use #21516D 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.