#21638C
Closest named color: Peacock Blue (#016795). oklch(47.8% 0.093 240.4), rgb(33, 99, 140).
Aa
White text reads best on this color (6.50:1).
About this color
#21638C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.093 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.018 away. White text reads best on it, at 6.50:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.22:1 |
| White text | 6.50:1 |
Values
| HEX | #21638C |
| RGB | rgb(33, 99, 140) |
| HSL | hsl(203, 62%, 34%) |
| OKLCH | oklch(47.8% 0.093 240.4) |
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 #21638C | 6.50:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #21638C | 3.22:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #21638C text on white | 6.50:1 | AA | Lc 81.9 | Fine for body text |
| #21638C text on black | 3.22:1 | AA large text | Lc -19.9 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CBDCE8
oklch(88.5% 0.025 238.4)
-
Step 300
300
#A7C5DB
oklch(80.8% 0.045 239.9)
-
Step 400
400
#77A7C9
oklch(70.7% 0.072 239.9)
-
Step 500
500
#5291BC
oklch(63.2% 0.092 240.2)
-
Step 600
600
#347AA8
oklch(55.6% 0.1 240.8)
-
Step 700
700 (this color)
#21638C
oklch(47.8% 0.093 240.4)
-
Step 800
800
#215475
oklch(42.7% 0.077 240.4)
-
Step 900
900
#21465E
oklch(37.8% 0.059 239.4)
-
Step 950
950
#142937
oklch(27% 0.038 239.4)
#21638C 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) | #50638E | 0.048 |
| Deuteranopia (no green cones) | #41598B | 0.038 |
| Tritanopia (no blue cones) | #006D71 | 0.063 |
| Achromatopsia (no color) | #5E5E5E | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21638C
#21638C
oklch(47.8% 0.093 240.4)
- #824F1F
#824F1F
oklch(47.7% 0.092 60.5)
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 #21638C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.018
- Denim #3B638C ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.026
- Denim Blue #3B5B92 ΔE 0.034
- Dusky Blue #475F94 ΔE 0.041
- Ocean Blue #03719C ΔE 0.043
- YInMn Blue #415A77 ΔE 0.044
- Dusk Blue #26538D ΔE 0.048
Use #21638C 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.