#638E91
Closest named color: Dusty Teal (#4C9085). oklch(61.7% 0.047 201.5), rgb(99, 142, 145).
Aa
Black text reads best on this color (5.80:1).
About this color
#638E91 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 62%, its chroma 0.047 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Teal (#4C9085), ΔE 0.033 away. Black text reads best on it, at 5.80:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (62%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dusty Teal (#4C9085) |
| Black text | 5.80:1 |
| White text | 3.61:1 |
Values
| HEX | #638E91 |
| RGB | rgb(99, 142, 145) |
| HSL | hsl(184, 19%, 48%) |
| OKLCH | oklch(61.7% 0.047 201.5) |
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 #638E91 | 3.61:1 | AA large text | Lc -69.2 | Content text, not long reading |
| Black text on #638E91 | 5.80:1 | AA | Lc 40.4 | Non-text elements, placeholder text |
| #638E91 text on white | 3.61:1 | AA large text | Lc 63.7 | Content text, not long reading |
| #638E91 text on black | 5.80:1 | AA | Lc -38.0 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D0DCDD
oklch(88.6% 0.013 202.9)
-
Step 300
300
#B0C5C7
oklch(80.8% 0.023 203.7)
-
Step 400
400
#86A8AA
oklch(70.7% 0.037 200.8)
-
Step 500
500 (this color)
#638E91
oklch(61.7% 0.047 201.5)
-
Step 600
600
#4E7D80
oklch(55.7% 0.051 200.9)
-
Step 700
700
#3E696C
oklch(49.1% 0.048 201.4)
-
Step 800
800
#345658
oklch(42.8% 0.04 200.5)
-
Step 900
900
#2E4748
oklch(37.8% 0.031 199.1)
-
Step 950
950
#1B292A
oklch(26.9% 0.019 201.6)
#638E91 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) | #888A91 | 0.048 |
| Deuteranopia (no green cones) | #808491 | 0.045 |
| Tritanopia (no blue cones) | #52918F | 0.020 |
| Achromatopsia (no color) | #878787 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638E91
#638E91
oklch(61.7% 0.047 201.5)
- #A07A79
#A07A79
oklch(61.6% 0.048 20.3)
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 #638E91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Teal #4C9085 ΔE 0.033
- Steel #738595 ΔE 0.034
- Steel Grey #6F828A ΔE 0.034
- Light Slate Gray #778899 ΔE 0.035
- Blue Grey #758DA3 ΔE 0.038
- Slate Gray #708090 ΔE 0.042
- Grey Teal #5E9B8A ΔE 0.043
- Sea #3C9992 ΔE 0.044
Use #638E91 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.