#6399B2
Closest named color: Greyblue (#77A1B5). oklch(65.5% 0.068 228.9), rgb(99, 153, 178).
Aa
Black text reads best on this color (6.72:1).
About this color
#6399B2 is a medium-light, muted teal or cyan. In OKLCH its lightness is 65%, its chroma 0.068 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.034 away. Black text reads best on it, at 6.72:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.72:1 |
| White text | 3.12:1 |
Values
| HEX | #6399B2 |
| RGB | rgb(99, 153, 178) |
| HSL | hsl(199, 34%, 54%) |
| OKLCH | oklch(65.5% 0.068 228.9) |
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 #6399B2 | 3.12:1 | AA large text | Lc -63.5 | Content text, not long reading |
| Black text on #6399B2 | 6.72:1 | AA | Lc 45.9 | Large or bold text, headings |
| #6399B2 text on white | 3.12:1 | AA large text | Lc 58.1 | Large or bold text, headings |
| #6399B2 text on black | 6.72:1 | AA | Lc -43.6 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CDDCE3
oklch(88.5% 0.019 227.3)
-
Step 300
300
#ABC5D2
oklch(80.8% 0.034 229.4)
-
Step 400
400
#7EA8BB
oklch(70.8% 0.053 227.5)
-
Step 500
500 (this color)
#6399B2
oklch(65.5% 0.068 228.9)
-
Step 600
600
#407C96
oklch(55.7% 0.074 228.5)
-
Step 700
700
#326880
oklch(49.1% 0.069 229.4)
-
Step 800
800
#2A5568
oklch(42.7% 0.057 229)
-
Step 900
900
#274654
oklch(37.6% 0.044 228.8)
-
Step 950
950
#172931
oklch(26.9% 0.028 227.9)
#6399B2 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) | #8C97B3 | 0.050 |
| Deuteranopia (no green cones) | #818EB2 | 0.045 |
| Tritanopia (no blue cones) | #41A0A1 | 0.048 |
| Achromatopsia (no color) | #929292 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6399B2
#6399B2
oklch(65.5% 0.068 228.9)
- #B3856C
#B3856C
oklch(65.5% 0.067 49.7)
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 #6399B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.034
- Cadet Blue #5F9EA0 ΔE 0.035
- Silver Lake Blue #778DA9 ΔE 0.037
- Blue Grey #758DA3 ΔE 0.037
- Faded Blue #658CBB ΔE 0.043
- Cool Gray #8D99AE ΔE 0.051
- Bluey Grey #89A0B0 ΔE 0.052
- Bluegrey #85A3B2 ΔE 0.052
Use #6399B2 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.