#00359B
Closest named color: Sapphire (#2138AB). oklch(37.7% 0.173 261.9), rgb(0, 53, 155).
Aa
White text reads best on this color (10.59:1).
About this color
#00359B is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.173 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.037 away. White text reads best on it, at 10.59:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.98:1 |
| White text | 10.59:1 |
Values
| HEX | #00359B |
| RGB | rgb(0, 53, 155) |
| HSL | hsl(219, 100%, 30%) |
| OKLCH | oklch(37.7% 0.173 261.9) |
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 #00359B | 10.59:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #00359B | 1.98:1 | Fails | Lc 10.4 | Not readable |
| #00359B text on white | 10.59:1 | AAA | Lc 93.5 | Preferred for body text |
| #00359B text on black | 1.98:1 | Fails | Lc -9.0 | 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 900.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400
#6A9EFF
oklch(70.6% 0.153 261.9)
-
Step 500
500
#4182FF
oklch(63.1% 0.198 261.8)
-
Step 600
600
#0C61FF
oklch(55.5% 0.246 262)
-
Step 700
700
#004FDD
oklch(49% 0.226 261.9)
-
Step 800
800
#0040B8
oklch(42.7% 0.197 262)
-
Step 900
900 (this color)
#00359B
oklch(37.7% 0.173 261.9)
-
Step 950
950
#04215B
oklch(27.1% 0.11 261.7)
#00359B 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) | #00469E | 0.043 |
| Deuteranopia (no green cones) | #003899 | 0.008 |
| Tritanopia (no blue cones) | #005163 | 0.132 |
| Achromatopsia (no color) | #3F3F3F | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00359B
#00359B
oklch(37.7% 0.173 261.9)
- #563D00
#563D00
oklch(37.8% 0.078 82.4)
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 #00359B, closest first.
No curated palette has a color within ΔE 0.04 of #00359B.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.037
- Royal #0C1793 ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Cobalt Blue #030AA7 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.069
- Ultramarine #2000B1 ΔE 0.069
- Indigo Blue #3A18B1 ΔE 0.073
- Blueberry #464196 ΔE 0.083
Use #00359B 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.