#638EA1
Closest named color: Blue Grey (#758DA3). oklch(62.2% 0.055 227.3), rgb(99, 142, 161).
Aa
Black text reads best on this color (5.91:1).
About this color
#638EA1 is a medium-light, muted teal or cyan. In OKLCH its lightness is 62%, its chroma 0.055 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Grey (#758DA3), ΔE 0.022 away. Black text reads best on it, at 5.91:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (62%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Blue Grey (#758DA3) |
| Black text | 5.91:1 |
| White text | 3.55:1 |
Values
| HEX | #638EA1 |
| RGB | rgb(99, 142, 161) |
| HSL | hsl(198, 25%, 51%) |
| OKLCH | oklch(62.2% 0.055 227.3) |
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 #638EA1 | 3.55:1 | AA large text | Lc -68.5 | Content text, not long reading |
| Black text on #638EA1 | 5.91:1 | AA | Lc 41.0 | Non-text elements, placeholder text |
| #638EA1 text on white | 3.55:1 | AA large text | Lc 63.0 | Content text, not long reading |
| #638EA1 text on black | 5.91:1 | AA | Lc -38.6 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#CFDBE1
oklch(88.4% 0.015 229)
-
Step 300
300
#AFC5CE
oklch(81% 0.027 224.3)
-
Step 400
400
#85A7B6
oklch(70.8% 0.043 226.6)
-
Step 500
500 (this color)
#638EA1
oklch(62.2% 0.055 227.3)
-
Step 600
600
#4C7B8F
oklch(55.7% 0.06 227)
-
Step 700
700
#3D6779
oklch(49% 0.055 227.3)
-
Step 800
800
#325463
oklch(42.6% 0.047 227.9)
-
Step 900
900
#2D4651
oklch(37.9% 0.036 227.4)
-
Step 950
950
#1A292F
oklch(27% 0.023 224.8)
#638EA1 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) | #848CA2 | 0.042 |
| Deuteranopia (no green cones) | #7B85A1 | 0.037 |
| Tritanopia (no blue cones) | #4C9494 | 0.039 |
| Achromatopsia (no color) | #888888 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638EA1
#638EA1
oklch(62.2% 0.055 227.3)
- #A37D6A
#A37D6A
oklch(62.2% 0.055 47.8)
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 #638EA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Grey #758DA3 ΔE 0.022
- Light Slate Gray #778899 ΔE 0.028
- Silver Lake Blue #778DA9 ΔE 0.029
- Steel #738595 ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.036
- Steel Grey #6F828A ΔE 0.041
- Slate Gray #708090 ΔE 0.041
- Faded Blue #658CBB ΔE 0.043
Use #638EA1 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.