#21497D
Closest named color: Light Navy (#155084). oklch(40.5% 0.099 256), rgb(33, 73, 125).
Aa
White text reads best on this color (9.07:1).
About this color
#21497D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.099 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.022 away. White text reads best on it, at 9.07:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.31:1 |
| White text | 9.07:1 |
Values
| HEX | #21497D |
| RGB | rgb(33, 73, 125) |
| HSL | hsl(214, 58%, 31%) |
| OKLCH | oklch(40.5% 0.099 256) |
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 #21497D | 9.07:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #21497D | 2.31:1 | Fails | Lc 13.4 | Not readable |
| #21497D text on white | 9.07:1 | AAA | Lc 90.6 | Preferred for body text |
| #21497D text on black | 2.31:1 | Fails | Lc -11.7 | Not readable |
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 800.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CCDBEF
oklch(88.6% 0.032 255.6)
-
Step 300
300
#A9C3E6
oklch(81% 0.057 255.9)
-
Step 400
400
#7AA3DA
oklch(70.7% 0.093 256)
-
Step 500
500
#588BD0
oklch(63.1% 0.118 256.3)
-
Step 600
600
#3C74BD
oklch(55.7% 0.128 256)
-
Step 700
700
#2E61A3
oklch(49.2% 0.119 256)
-
Step 800
800 (this color)
#21497D
oklch(40.5% 0.099 256)
-
Step 900
900
#24426A
oklch(37.6% 0.078 256.2)
-
Step 950
950
#16273E
oklch(27% 0.049 256.3)
#21497D 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) | #314D7F | 0.022 |
| Deuteranopia (no green cones) | #22457C | 0.012 |
| Tritanopia (no blue cones) | #00555D | 0.076 |
| Achromatopsia (no color) | #484848 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21497D
#21497D
oklch(40.5% 0.099 256)
- #634100
#634100
oklch(40.4% 0.085 75.4)
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 #21497D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.022
- Twilight Blue #0A437A ΔE 0.026
- Cobalt #1E488F ΔE 0.031
- Deep Sea Blue #015482 ΔE 0.033
- Dusk Blue #26538D ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.064
Use #21497D 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.