#00339E
Closest named color: Sapphire (#2138AB). oklch(37.6% 0.18 262.4), rgb(0, 51, 158).
Aa
White text reads best on this color (10.67:1).
About this color
#00339E is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.180 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.036 away. White text reads best on it, at 10.67:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.96:1 |
| White text | 10.67:1 |
Values
| HEX | #00339E |
| RGB | rgb(0, 51, 158) |
| HSL | hsl(221, 100%, 31%) |
| OKLCH | oklch(37.6% 0.18 262.4) |
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 #00339E | 10.67:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #00339E | 1.96:1 | Fails | Lc 10.3 | Not readable |
| #00339E text on white | 10.67:1 | AAA | Lc 93.6 | Preferred for body text |
| #00339E text on black | 1.96:1 | Fails | Lc -8.9 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400
#6C9EFF
oklch(70.7% 0.152 262.5)
-
Step 500
500
#4381FF
oklch(63% 0.199 262.5)
-
Step 600
600
#1361FF
oklch(55.6% 0.245 262.4)
-
Step 700
700
#004DE2
oklch(49.1% 0.234 262.4)
-
Step 800
800
#003EBC
oklch(42.7% 0.205 262.4)
-
Step 900
900 (this color)
#00339E
oklch(37.6% 0.18 262.4)
-
Step 950
950
#04205D
oklch(27.1% 0.114 262.4)
#00339E 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) | #0045A1 | 0.045 |
| Deuteranopia (no green cones) | #00379C | 0.010 |
| Tritanopia (no blue cones) | #005164 | 0.137 |
| Achromatopsia (no color) | #3E3E3E | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00339E
#00339E
oklch(37.6% 0.18 262.4)
- #553C00
#553C00
oklch(37.4% 0.077 82.1)
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 #00339E, closest first.
No curated palette has a color within ΔE 0.04 of #00339E.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.036
- Royal #0C1793 ΔE 0.056
- Cobalt Blue #030AA7 ΔE 0.060
- Ultramarine #2000B1 ΔE 0.063
- Cobalt #1E488F ΔE 0.065
- Indigo Blue #3A18B1 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.075
- True Blue #010FCC ΔE 0.082
Use #00339E 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.