#6399A4
Closest named color: Cadet Blue (#5F9EA0). oklch(64.9% 0.059 211.9), rgb(99, 153, 164).
Aa
Black text reads best on this color (6.62:1).
About this color
#6399A4 is a medium-light, muted teal or cyan. In OKLCH its lightness is 65%, its chroma 0.059 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.018 away. Black text reads best on it, at 6.62:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.62:1 |
| White text | 3.17:1 |
Values
| HEX | #6399A4 |
| RGB | rgb(99, 153, 164) |
| HSL | hsl(190, 26%, 52%) |
| OKLCH | oklch(64.9% 0.059 211.9) |
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 #6399A4 | 3.17:1 | AA large text | Lc -64.2 | Content text, not long reading |
| Black text on #6399A4 | 6.62:1 | AA | Lc 45.3 | Large or bold text, headings |
| #6399A4 text on white | 3.17:1 | AA large text | Lc 58.8 | Large or bold text, headings |
| #6399A4 text on black | 6.62:1 | AA | Lc -43.0 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CEDCDF
oklch(88.5% 0.016 212)
-
Step 300
300
#ACC6CB
oklch(80.9% 0.029 210.5)
-
Step 400
400
#7FA9B1
oklch(70.7% 0.047 210.6)
-
Step 500
500 (this color)
#6399A4
oklch(64.9% 0.059 211.9)
-
Step 600
600
#427E89
oklch(55.7% 0.064 210.8)
-
Step 700
700
#336A74
oklch(49.1% 0.06 210.9)
-
Step 800
800
#2B565F
oklch(42.6% 0.05 212.9)
-
Step 900
900
#28474D
oklch(37.6% 0.038 211.3)
-
Step 950
950
#182A2D
oklch(27.1% 0.024 209.1)
#6399A4 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) | #9095A5 | 0.056 |
| Deuteranopia (no green cones) | #858DA4 | 0.051 |
| Tritanopia (no blue cones) | #499E9C | 0.032 |
| Achromatopsia (no color) | #919191 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6399A4
#6399A4
oklch(64.9% 0.059 211.9)
- #B08279
#B08279
oklch(64.9% 0.059 31.2)
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 #6399A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.018
- Blue Grey #758DA3 ΔE 0.038
- Dull Teal #5F9E8F ΔE 0.040
- Greyblue #77A1B5 ΔE 0.040
- Silver Lake Blue #778DA9 ΔE 0.043
- Grey Teal #5E9B8A ΔE 0.043
- Sea #3C9992 ΔE 0.047
- Light Slate Gray #778899 ΔE 0.049
Use #6399A4 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.