#39B8F4
Closest named color: Deep Sky Blue (#00BFFF). oklch(74% 0.138 234.1), rgb(57, 184, 244).
Aa
Black text reads best on this color (9.33:1).
About this color
#39B8F4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.138 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.023 away. Black text reads best on it, at 9.33:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.33:1 |
| White text | 2.24:1 |
Values
| HEX | #39B8F4 |
| RGB | rgb(57, 184, 244) |
| HSL | hsl(199, 89%, 59%) |
| OKLCH | oklch(74% 0.138 234.1) |
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 #39B8F4 | 2.24:1 | Fails | Lc -48.7 | Large or bold text, headings |
| Black text on #39B8F4 | 9.33:1 | AAA | Lc 60.0 | Content text, not long reading |
| #39B8F4 text on white | 2.24:1 | Fails | Lc 43.9 | Non-text elements, placeholder text |
| #39B8F4 text on black | 9.33:1 | AAA | Lc -58.2 | Large or bold text, headings |
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 400.
-
Step 50
50
#EEF7FC
oklch(97.1% 0.012 231.7)
-
Step 100
100
#DBEDF8
oklch(93.6% 0.024 234.4)
-
Step 200
200
#BBDFF4
oklch(88.4% 0.048 233.7)
-
Step 300
300
#88CAF0
oklch(80.8% 0.086 234.6)
-
Step 400
400 (this color)
#39B8F4
oklch(74% 0.138 234.1)
-
Step 500
500
#0095CD
oklch(63.1% 0.132 234.2)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004865
oklch(37.8% 0.079 233.7)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#39B8F4 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) | #9AB7F7 | 0.085 |
| Deuteranopia (no green cones) | #81A5F3 | 0.071 |
| Tritanopia (no blue cones) | #00C8CC | 0.086 |
| Achromatopsia (no color) | #ADADAD | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #39B8F4
#39B8F4
oklch(74% 0.138 234.1)
- #ED9150
#ED9150
oklch(74% 0.137 54)
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 #39B8F4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.023
- Vivid Sky Blue #4CC9F0 ΔE 0.052
- Bright Sky Blue #02CCFE ΔE 0.052
- Carolina Blue #8AB8FE ΔE 0.069
- Lightblue #7BC8F6 ΔE 0.070
- Turquoise Blue #06B1C4 ΔE 0.075
- Sky #82CAFC ΔE 0.080
- Light Sky Blue #87CEFA ΔE 0.091
Use #39B8F4 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.