#637AF4
Closest named color: Cornflower (#6A79F7). oklch(62.4% 0.183 272), rgb(99, 122, 244).
Aa
Black text reads best on this color (5.62:1).
About this color
#637AF4 is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.183 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.010 away. Black text reads best on it, at 5.62:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.62:1 |
| White text | 3.73:1 |
Values
| HEX | #637AF4 |
| RGB | rgb(99, 122, 244) |
| HSL | hsl(230, 87%, 67%) |
| OKLCH | oklch(62.4% 0.183 272) |
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 #637AF4 | 3.73:1 | AA large text | Lc -70.1 | Content text, not long reading |
| Black text on #637AF4 | 5.62:1 | AA | Lc 39.5 | Non-text elements, placeholder text |
| #637AF4 text on white | 3.73:1 | AA large text | Lc 64.6 | Content text, not long reading |
| #637AF4 text on black | 5.62:1 | AA | Lc -37.0 | 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
#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
#ACBEFB
oklch(81% 0.089 271.6)
-
Step 400
400
#8299F9
oklch(70.7% 0.143 272.1)
-
Step 500
500 (this color)
#637AF4
oklch(62.4% 0.183 272)
-
Step 600
600
#4F62E5
oklch(55.7% 0.198 272.1)
-
Step 700
700
#4050C7
oklch(49.1% 0.184 271.9)
-
Step 800
800
#3542A1
oklch(42.7% 0.153 272.3)
-
Step 900
900
#2D3980
oklch(37.7% 0.12 272.1)
-
Step 950
950
#1A224B
oklch(27% 0.076 272.1)
#637AF4 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) | #378BF8 | 0.052 |
| Deuteranopia (no green cones) | #147EF1 | 0.059 |
| Tritanopia (no blue cones) | #0096AC | 0.158 |
| Achromatopsia (no color) | #848484 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637AF4
#637AF4
oklch(62.4% 0.183 272)
- #A38400
#A38400
oklch(62.4% 0.128 92.2)
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 #637AF4, closest first.
No curated palette has a color within ΔE 0.04 of #637AF4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.010
- Soft Blue #6488EA ΔE 0.041
- Medium Slate Blue #7B68EE ΔE 0.049
- Clear Blue #247AFD ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.064
- Periwinkle #8E82FE ΔE 0.065
- Royal Blue #4169E1 ΔE 0.067
- Lavender Blue #8B88F8 ΔE 0.067
Use #637AF4 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.