#21689B
Closest named color: Peacock Blue (#016795). oklch(49.9% 0.107 244.5), rgb(33, 104, 155).
Aa
White text reads best on this color (5.96:1).
About this color
#21689B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.107 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.017 away. White text reads best on it, at 5.96:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.51:1 |
| White text | 5.96:1 |
Values
| HEX | #21689B |
| RGB | rgb(33, 104, 155) |
| HSL | hsl(205, 65%, 37%) |
| OKLCH | oklch(49.9% 0.107 244.5) |
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 #21689B | 5.96:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #21689B | 3.51:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #21689B text on white | 5.96:1 | AA | Lc 79.5 | Fine for body text |
| #21689B text on black | 3.51:1 | AA large text | Lc -22.3 | 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
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A5C5E0
oklch(80.9% 0.052 243.9)
-
Step 400
400
#74A6D1
oklch(70.6% 0.083 245.3)
-
Step 500
500
#4D90C5
oklch(63.2% 0.105 244.5)
-
Step 600
600
#2C79B1
oklch(55.6% 0.114 244.3)
-
Step 700
700 (this color)
#21689B
oklch(49.9% 0.107 244.5)
-
Step 800
800
#1C537C
oklch(42.7% 0.089 244.9)
-
Step 900
900
#1D4563
oklch(37.7% 0.068 243.8)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#21689B 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) | #506A9D | 0.046 |
| Deuteranopia (no green cones) | #3F5E9A | 0.035 |
| Tritanopia (no blue cones) | #00747A | 0.074 |
| Achromatopsia (no color) | #636363 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21689B
#21689B
oklch(49.9% 0.107 244.5)
- #8C540F
#8C540F
oklch(49.9% 0.106 64.4)
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 #21689B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.017
- Ocean Blue #03719C ΔE 0.027
- Denim #3B638C ΔE 0.030
- Muted Blue #3B719F ΔE 0.036
- Mid Blue #276AB3 ΔE 0.039
- Dusky Blue #475F94 ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.040
- Sea Blue #047495 ΔE 0.040
Use #21689B 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.