#21749F
Closest named color: Ocean Blue (#03719C). oklch(53.1% 0.102 236.5), rgb(33, 116, 159).
Aa
White text reads best on this color (5.16:1).
About this color
#21749F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.102 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.015 away. White text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 4.06:1 |
| White text | 5.16:1 |
Values
| HEX | #21749F |
| RGB | rgb(33, 116, 159) |
| HSL | hsl(200, 66%, 38%) |
| OKLCH | oklch(53.1% 0.102 236.5) |
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 #21749F | 5.16:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #21749F | 4.06:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #21749F text on white | 5.16:1 | AA | Lc 75.2 | Fine for body text |
| #21749F text on black | 4.06:1 | AA large text | Lc -26.5 | 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
#A5C6DB
oklch(80.9% 0.046 236.1)
-
Step 400
400
#73A8C9
oklch(70.7% 0.074 236.6)
-
Step 500
500
#4C92BB
oklch(63.1% 0.094 236.6)
-
Step 600
600 (this color)
#21749F
oklch(53.1% 0.102 236.5)
-
Step 700
700
#1C688F
oklch(49.1% 0.094 236.4)
-
Step 800
800
#1A5574
oklch(42.7% 0.078 236.1)
-
Step 900
900
#1D465E
oklch(37.6% 0.061 237.2)
-
Step 950
950
#122937
oklch(26.9% 0.039 237.4)
#21749F 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) | #5F74A1 | 0.059 |
| Deuteranopia (no green cones) | #4E689E | 0.048 |
| Tritanopia (no blue cones) | #007F83 | 0.064 |
| Achromatopsia (no color) | #6D6D6D | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21749F
#21749F
oklch(53.1% 0.102 236.5)
- #985B2A
#985B2A
oklch(53.1% 0.102 56.7)
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 #21749F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.015
- Muted Blue #3B719F ΔE 0.019
- Sea Blue #047495 ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.026
- Nice Blue #107AB0 ΔE 0.028
- Dull Blue #49759C ΔE 0.033
- Ocean #017B92 ΔE 0.035
- Cerulean #457B9D ΔE 0.038
Use #21749F 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.