#639990
Closest named color: Grey Teal (#5E9B8A). oklch(64.2% 0.059 182.8), rgb(99, 153, 144).
Aa
Black text reads best on this color (6.48:1).
About this color
#639990 is a medium-light, muted teal or cyan. In OKLCH its lightness is 64%, its chroma 0.059 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Teal (#5E9B8A), ΔE 0.014 away. Black text reads best on it, at 6.48:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Grey Teal (#5E9B8A) |
| Black text | 6.48:1 |
| White text | 3.23:1 |
Values
| HEX | #639990 |
| RGB | rgb(99, 153, 144) |
| HSL | hsl(170, 21%, 49%) |
| OKLCH | oklch(64.2% 0.059 182.8) |
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 #639990 | 3.23:1 | AA large text | Lc -65.0 | Content text, not long reading |
| Black text on #639990 | 6.48:1 | AA | Lc 44.5 | Non-text elements, placeholder text |
| #639990 text on white | 3.23:1 | AA large text | Lc 59.6 | Large or bold text, headings |
| #639990 text on black | 6.48:1 | AA | Lc -42.2 | 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
#E4ECEA
oklch(93.6% 0.009 179.6)
-
Step 200
200
#CEDDDA
oklch(88.5% 0.017 182.7)
-
Step 300
300
#ADC7C2
oklch(80.9% 0.029 182.7)
-
Step 400
400
#81AAA3
oklch(70.6% 0.046 183.4)
-
Step 500
500 (this color)
#639990
oklch(64.2% 0.059 182.8)
-
Step 600
600
#448077
oklch(55.7% 0.065 183.1)
-
Step 700
700
#366C64
oklch(49.2% 0.059 183.1)
-
Step 800
800
#2D5851
oklch(42.7% 0.05 182.1)
-
Step 900
900
#294843
oklch(37.6% 0.038 182.8)
-
Step 950
950
#192A27
oklch(26.9% 0.023 182.2)
#639990 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) | #949390 | 0.063 |
| Deuteranopia (no green cones) | #8B8C91 | 0.060 |
| Tritanopia (no blue cones) | #519B96 | 0.018 |
| Achromatopsia (no color) | #8F8F8F | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #639990
#639990
oklch(64.2% 0.059 182.8)
- #AC7E89
#AC7E89
oklch(64.2% 0.059 3.1)
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 #639990, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Teal #5E9B8A ΔE 0.014
- Dull Teal #5F9E8F ΔE 0.015
- Cadet Blue #5F9EA0 ΔE 0.023
- Sea #3C9992 ΔE 0.034
- Dusty Teal #4C9085 ΔE 0.039
- Persian Green #2A9D8F ΔE 0.044
- Green Grey #77926F ΔE 0.047
- Slate Green #658D6D ΔE 0.052
Use #639990 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.