#21597F
Closest named color: Light Navy Blue (#2E5A88). oklch(44.6% 0.085 242.1), rgb(33, 89, 127).
Aa
White text reads best on this color (7.49:1).
About this color
#21597F is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.085 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.020 away. White text reads best on it, at 7.49:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.80:1 |
| White text | 7.49:1 |
Values
| HEX | #21597F |
| RGB | rgb(33, 89, 127) |
| HSL | hsl(204, 59%, 31%) |
| OKLCH | oklch(44.6% 0.085 242.1) |
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 #21597F | 7.49:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #21597F | 2.80:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #21597F text on white | 7.49:1 | AAA | Lc 85.8 | Fine for body text |
| #21597F text on black | 2.80:1 | Fails | Lc -16.2 | 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 800.
-
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
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A5C5DF
oklch(80.9% 0.05 242.9)
-
Step 400
400
#73A7CE
oklch(70.7% 0.08 241.7)
-
Step 500
500
#4C90C2
oklch(63% 0.102 242.6)
-
Step 600
600
#2B7AAE
oklch(55.6% 0.11 241.9)
-
Step 700
700
#1D6696
oklch(49% 0.104 242.7)
-
Step 800
800 (this color)
#21597F
oklch(44.6% 0.085 242.1)
-
Step 900
900
#1D4562
oklch(37.6% 0.067 242.9)
-
Step 950
950
#122939
oklch(27% 0.042 241)
#21597F 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) | #485A81 | 0.042 |
| Deuteranopia (no green cones) | #3B517E | 0.032 |
| Tritanopia (no blue cones) | #006266 | 0.059 |
| Achromatopsia (no color) | #555555 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21597F
#21597F
oklch(44.6% 0.085 242.1)
- #75481B
#75481B
oklch(44.5% 0.085 62.1)
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 #21597F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.020
- Deep Sea Blue #015482 ΔE 0.025
- Dusk Blue #26538D ΔE 0.033
- Light Navy #155084 ΔE 0.033
- YInMn Blue #415A77 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.042
- Denim #3B638C ΔE 0.045
- Petrol #005F6A ΔE 0.047
Use #21597F 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.