#21639E
Closest named color: Peacock Blue (#016795). oklch(48.9% 0.115 249.5), rgb(33, 99, 158).
Aa
White text reads best on this color (6.28:1).
About this color
#21639E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.115 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.024 away. White text reads best on it, at 6.28:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.34:1 |
| White text | 6.28:1 |
Values
| HEX | #21639E |
| RGB | rgb(33, 99, 158) |
| HSL | hsl(208, 65%, 37%) |
| OKLCH | oklch(48.9% 0.115 249.5) |
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 #21639E | 6.28:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #21639E | 3.34:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #21639E text on white | 6.28:1 | AA | Lc 80.9 | Fine for body text |
| #21639E text on black | 3.34:1 | AA large text | Lc -20.9 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADBED
oklch(88.4% 0.031 249.7)
-
Step 300
300
#A6C4E4
oklch(80.9% 0.056 250.2)
-
Step 400
400
#75A5D6
oklch(70.7% 0.089 249.7)
-
Step 500
500
#4F8ECB
oklch(63.1% 0.113 249.4)
-
Step 600
600
#3077B8
oklch(55.6% 0.123 249.4)
-
Step 700
700 (this color)
#21639E
oklch(48.9% 0.115 249.5)
-
Step 800
800
#1E5281
oklch(42.8% 0.095 249.2)
-
Step 900
900
#1F4467
oklch(37.7% 0.074 249.2)
-
Step 950
950
#13283C
oklch(27% 0.046 248.8)
#21639E 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) | #4766A0 | 0.038 |
| Deuteranopia (no green cones) | #355B9D | 0.025 |
| Tritanopia (no blue cones) | #007179 | 0.084 |
| Achromatopsia (no color) | #606060 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21639E
#21639E
oklch(48.9% 0.115 249.5)
- #865300
#865300
oklch(48.9% 0.106 69.3)
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 #21639E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.024
- Denim Blue #3B5B92 ΔE 0.031
- Denim #3B638C ΔE 0.035
- Dusky Blue #475F94 ΔE 0.037
- Mid Blue #276AB3 ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.039
- Ocean Blue #03719C ΔE 0.042
- French Blue #436BAD ΔE 0.046
Use #21639E 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.