#0399CF
Closest named color: Water Blue (#0E87CC). oklch(64.2% 0.132 232.7), rgb(3, 153, 207).
Aa
Black text reads best on this color (6.46:1).
About this color
#0399CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.132 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.051 away. Black text reads best on it, at 6.46:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 6.46:1 |
| White text | 3.25:1 |
Values
| HEX | #0399CF |
| RGB | rgb(3, 153, 207) |
| HSL | hsl(196, 97%, 41%) |
| OKLCH | oklch(64.2% 0.132 232.7) |
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 #0399CF | 3.25:1 | AA large text | Lc -64.6 | Content text, not long reading |
| Black text on #0399CF | 6.46:1 | AA | Lc 44.9 | Non-text elements, placeholder text |
| #0399CF text on white | 3.25:1 | AA large text | Lc 59.1 | Large or bold text, headings |
| #0399CF text on black | 6.46:1 | AA | Lc -42.6 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DEECF4
oklch(93.5% 0.018 232.5)
-
Step 200
200
#C3DEED
oklch(88.5% 0.035 232.1)
-
Step 300
300
#97C8E4
oklch(80.8% 0.065 233.7)
-
Step 400
400
#57ACD6
oklch(70.8% 0.103 232.2)
-
Step 500
500 (this color)
#0399CF
oklch(64.2% 0.132 232.7)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#012A3C
oklch(26.8% 0.054 232.9)
#0399CF 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) | #7E98D2 | 0.084 |
| Deuteranopia (no green cones) | #6687CE | 0.070 |
| Tritanopia (no blue cones) | #00A7AB | 0.078 |
| Achromatopsia (no color) | #8F8F8F | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0399CF
#0399CF
oklch(64.2% 0.132 232.7)
- #CA7337
#CA7337
oklch(64.2% 0.132 52.5)
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 #0399CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.051
- Blue NCS #118AB2 ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.061
- Cool Blue #4984B8 ΔE 0.062
- Faded Blue #658CBB ΔE 0.062
- Steel Blue #4682B4 ΔE 0.068
- Dusty Blue #5A86AD ΔE 0.071
Use #0399CF 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.