#399FBD
Closest named color: Cadet Blue (#5F9EA0). oklch(65.7% 0.102 221.2), rgb(57, 159, 189).
Aa
Black text reads best on this color (6.86:1).
About this color
#399FBD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.102 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.049 away. Black text reads best on it, at 6.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.86:1 |
| White text | 3.05:1 |
Values
| HEX | #399FBD |
| RGB | rgb(57, 159, 189) |
| HSL | hsl(194, 54%, 48%) |
| OKLCH | oklch(65.7% 0.102 221.2) |
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 #399FBD | 3.05:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #399FBD | 6.86:1 | AA | Lc 46.9 | Large or bold text, headings |
| #399FBD text on white | 3.05:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #399FBD text on black | 6.86:1 | AA | Lc -44.6 | 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
#F1F7F9
oklch(97.2% 0.007 219.6)
-
Step 100
100
#E0ECF1
oklch(93.6% 0.015 224.5)
-
Step 200
200
#C6DEE6
oklch(88.5% 0.028 219.8)
-
Step 300
300
#9EC9D8
oklch(81% 0.05 221.2)
-
Step 400
400
#65ACC4
oklch(70.7% 0.079 221.8)
-
Step 500
500 (this color)
#399FBD
oklch(65.7% 0.102 221.2)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C85
oklch(49.2% 0.09 221.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#07495A
oklch(37.6% 0.066 221.1)
-
Step 950
950
#092B35
oklch(27% 0.042 221.3)
#399FBD 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) | #8D9BBF | 0.083 |
| Deuteranopia (no green cones) | #7B8EBD | 0.074 |
| Tritanopia (no blue cones) | #00A9A9 | 0.051 |
| Achromatopsia (no color) | #939393 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399FBD
#399FBD
oklch(65.7% 0.102 221.2)
- #C67B5F
#C67B5F
oklch(65.6% 0.102 41.2)
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 #399FBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.049
- Turquoise Blue #06B1C4 ΔE 0.050
- Greyblue #77A1B5 ΔE 0.057
- Faded Blue #658CBB ΔE 0.061
- Sea #3C9992 ΔE 0.063
- Blue NCS #118AB2 ΔE 0.066
- Teal Green #0A9396 ΔE 0.068
- Silver Lake Blue #778DA9 ΔE 0.069
Use #399FBD 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.