#637BF6
Closest named color: Cornflower (#6A79F7). oklch(62.7% 0.185 271.8), rgb(99, 123, 246).
Aa
Black text reads best on this color (5.69:1).
About this color
#637BF6 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.185 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.009 away. Black text reads best on it, at 5.69:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.69:1 |
| White text | 3.68:1 |
Values
| HEX | #637BF6 |
| RGB | rgb(99, 123, 246) |
| HSL | hsl(230, 89%, 68%) |
| OKLCH | oklch(62.7% 0.185 271.8) |
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 #637BF6 | 3.68:1 | AA large text | Lc -69.6 | Content text, not long reading |
| Black text on #637BF6 | 5.69:1 | AA | Lc 39.9 | Non-text elements, placeholder text |
| #637BF6 text on white | 3.68:1 | AA large text | Lc 64.2 | Content text, not long reading |
| #637BF6 text on black | 5.69:1 | AA | Lc -37.5 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ACBEFC
oklch(81% 0.09 271.8)
-
Step 400
400
#8199FA
oklch(70.7% 0.144 271.8)
-
Step 500
500 (this color)
#637BF6
oklch(62.7% 0.185 271.8)
-
Step 600
600
#4E61E6
oklch(55.5% 0.201 272)
-
Step 700
700
#3F50C8
oklch(49.2% 0.186 271.6)
-
Step 800
800
#3442A2
oklch(42.7% 0.155 271.8)
-
Step 900
900
#2C3980
oklch(37.6% 0.12 271.6)
-
Step 950
950
#1A224B
oklch(27% 0.076 272.1)
#637BF6 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) | #378CFA | 0.052 |
| Deuteranopia (no green cones) | #127FF3 | 0.059 |
| Tritanopia (no blue cones) | #0097AD | 0.159 |
| Achromatopsia (no color) | #858585 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637BF6
#637BF6
oklch(62.7% 0.185 271.8)
- #A48500
#A48500
oklch(62.8% 0.128 92.3)
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 #637BF6, closest first.
No curated palette has a color within ΔE 0.04 of #637BF6.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.009
- Soft Blue #6488EA ΔE 0.040
- Medium Slate Blue #7B68EE ΔE 0.051
- Clear Blue #247AFD ΔE 0.055
- Periwinkle #8E82FE ΔE 0.064
- Dark Sky Blue #448EE4 ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.066
- Lavender Blue #8B88F8 ΔE 0.066
Use #637BF6 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.