#639799
Closest named color: Cadet Blue (#5F9EA0). oklch(64.1% 0.055 198.9), rgb(99, 151, 153).
Aa
Black text reads best on this color (6.41:1).
About this color
#639799 is a medium-light, muted teal or cyan. In OKLCH its lightness is 64%, its chroma 0.055 and its hue 199°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.020 away. Black text reads best on it, at 6.41:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.41:1 |
| White text | 3.27:1 |
Values
| HEX | #639799 |
| RGB | rgb(99, 151, 153) |
| HSL | hsl(182, 21%, 49%) |
| OKLCH | oklch(64.1% 0.055 198.9) |
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 #639799 | 3.27:1 | AA large text | Lc -65.4 | Content text, not long reading |
| Black text on #639799 | 6.41:1 | AA | Lc 44.1 | Non-text elements, placeholder text |
| #639799 text on white | 3.27:1 | AA large text | Lc 60.0 | Large or bold text, headings |
| #639799 text on black | 6.41:1 | AA | Lc -41.7 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4EBEC
oklch(93.5% 0.008 207.1)
-
Step 200
200
#CEDCDD
oklch(88.4% 0.015 202)
-
Step 300
300
#ADC6C7
oklch(80.8% 0.027 199.6)
-
Step 400
400
#81A9AB
oklch(70.6% 0.043 200)
-
Step 500
500 (this color)
#639799
oklch(64.1% 0.055 198.9)
-
Step 600
600
#457E81
oklch(55.5% 0.06 200)
-
Step 700
700
#366B6D
oklch(49.2% 0.057 198.7)
-
Step 800
800
#2E5759
oklch(42.8% 0.046 199.7)
-
Step 900
900
#294849
oklch(37.8% 0.037 198.4)
-
Step 950
950
#192A2B
oklch(27.1% 0.023 200.6)
#639799 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) | #909299 | 0.057 |
| Deuteranopia (no green cones) | #868B99 | 0.053 |
| Tritanopia (no blue cones) | #4E9A97 | 0.022 |
| Achromatopsia (no color) | #8E8E8E | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #639799
#639799
oklch(64.1% 0.055 198.9)
- #AC7F7F
#AC7F7F
oklch(64.1% 0.056 18.7)
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 #639799, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.020
- Dull Teal #5F9E8F ΔE 0.030
- Grey Teal #5E9B8A ΔE 0.030
- Sea #3C9992 ΔE 0.038
- Blue Grey #758DA3 ΔE 0.042
- Dusty Teal #4C9085 ΔE 0.043
- Light Slate Gray #778899 ΔE 0.047
- Silver Lake Blue #778DA9 ΔE 0.049
Use #639799 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.