#638DA4
Closest named color: Blue Grey (#758DA3). oklch(62.1% 0.058 232.9), rgb(99, 141, 164).
Aa
Black text reads best on this color (5.87:1).
About this color
#638DA4 is a medium-light, muted blue. In OKLCH its lightness is 62%, its chroma 0.058 and its hue 233°. 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 5.87:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Blue Grey (#758DA3) |
| Black text | 5.87:1 |
| White text | 3.57:1 |
Values
| HEX | #638DA4 |
| RGB | rgb(99, 141, 164) |
| HSL | hsl(201, 26%, 52%) |
| OKLCH | oklch(62.1% 0.058 232.9) |
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 #638DA4 | 3.57:1 | AA large text | Lc -68.8 | Content text, not long reading |
| Black text on #638DA4 | 5.87:1 | AA | Lc 40.8 | Non-text elements, placeholder text |
| #638DA4 text on white | 3.57:1 | AA large text | Lc 63.3 | Content text, not long reading |
| #638DA4 text on black | 5.87:1 | AA | Lc -38.4 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#CFDBE2
oklch(88.4% 0.016 233)
-
Step 300
300
#AFC4D0
oklch(80.8% 0.029 232.8)
-
Step 400
400
#85A6B9
oklch(70.7% 0.046 233.5)
-
Step 500
500 (this color)
#638DA4
oklch(62.1% 0.058 232.9)
-
Step 600
600
#4C7A92
oklch(55.6% 0.063 232.2)
-
Step 700
700
#3D677D
oklch(49.2% 0.059 232.6)
-
Step 800
800
#335465
oklch(42.8% 0.048 231.9)
-
Step 900
900
#2D4552
oklch(37.6% 0.037 232.7)
-
Step 950
950
#1B2930
oklch(27.1% 0.023 230.3)
#638DA4 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) | #828CA5 | 0.039 |
| Deuteranopia (no green cones) | #7984A4 | 0.036 |
| Tritanopia (no blue cones) | #4B9394 | 0.043 |
| Achromatopsia (no color) | #878787 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638DA4
#638DA4
oklch(62.1% 0.058 232.9)
- #A37D66
#A37D66
oklch(62.1% 0.058 52.5)
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 #638DA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Grey #758DA3 ΔE 0.022
- Silver Lake Blue #778DA9 ΔE 0.026
- Light Slate Gray #778899 ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.030
- Steel #738595 ΔE 0.030
- Faded Blue #658CBB ΔE 0.037
- Off Blue #5684AE ΔE 0.038
- Slate Gray #708090 ΔE 0.041
Use #638DA4 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.