#21729C
Closest named color: Ocean Blue (#03719C). oklch(52.4% 0.1 236.4), rgb(33, 114, 156).
Aa
White text reads best on this color (5.31:1).
About this color
#21729C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.100 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.011 away. White text reads best on it, at 5.31:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.95:1 |
| White text | 5.31:1 |
Values
| HEX | #21729C |
| RGB | rgb(33, 114, 156) |
| HSL | hsl(200, 65%, 37%) |
| OKLCH | oklch(52.4% 0.1 236.4) |
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 #21729C | 5.31:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #21729C | 3.95:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #21729C text on white | 5.31:1 | AA | Lc 76.1 | Fine for body text |
| #21729C text on black | 3.95:1 | AA large text | Lc -25.7 | 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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A6C6DA
oklch(81% 0.045 235.5)
-
Step 400
400
#74A8C8
oklch(70.7% 0.072 236.2)
-
Step 500
500
#4D92BA
oklch(63.1% 0.092 236.2)
-
Step 600
600 (this color)
#21729C
oklch(52.4% 0.1 236.4)
-
Step 700
700
#1E688E
oklch(49.1% 0.093 236)
-
Step 800
800
#1C5573
oklch(42.7% 0.076 235.8)
-
Step 900
900
#1E465D
oklch(37.6% 0.06 236.6)
-
Step 950
950
#132937
oklch(27% 0.038 238.3)
#21729C 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) | #5E729E | 0.059 |
| Deuteranopia (no green cones) | #4D669B | 0.048 |
| Tritanopia (no blue cones) | #007D80 | 0.065 |
| Achromatopsia (no color) | #6B6B6B | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21729C
#21729C
oklch(52.4% 0.1 236.4)
- #95592A
#95592A
oklch(52.3% 0.1 56.2)
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 #21729C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.011
- Sea Blue #047495 ΔE 0.017
- Muted Blue #3B719F ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.034
- Dull Blue #49759C ΔE 0.035
- Ocean #017B92 ΔE 0.036
- Peacock Blue #016795 ΔE 0.037
Use #21729C 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.