#637FF2
Closest named color: Cornflower (#6A79F7). oklch(63.2% 0.174 270.5), rgb(99, 127, 242).
Aa
Black text reads best on this color (5.84:1).
About this color
#637FF2 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.174 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.018 away. Black text reads best on it, at 5.84:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.84:1 |
| White text | 3.59:1 |
Values
| HEX | #637FF2 |
| RGB | rgb(99, 127, 242) |
| HSL | hsl(228, 85%, 67%) |
| OKLCH | oklch(63.2% 0.174 270.5) |
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 #637FF2 | 3.59:1 | AA large text | Lc -68.7 | Content text, not long reading |
| Black text on #637FF2 | 5.84:1 | AA | Lc 40.8 | Non-text elements, placeholder text |
| #637FF2 text on white | 3.59:1 | AA large text | Lc 63.2 | Content text, not long reading |
| #637FF2 text on black | 5.84:1 | AA | Lc -38.5 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ABBEF9
oklch(80.8% 0.086 270.6)
-
Step 400
400
#809BF5
oklch(70.7% 0.135 270)
-
Step 500
500 (this color)
#637FF2
oklch(63.2% 0.174 270.5)
-
Step 600
600
#4C65E0
oklch(55.7% 0.189 270.4)
-
Step 700
700
#3D53C3
oklch(49.2% 0.176 270.2)
-
Step 800
800
#32449D
oklch(42.6% 0.146 270.4)
-
Step 900
900
#2C3B7D
oklch(37.8% 0.113 270.5)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#637FF2 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) | #468EF6 | 0.043 |
| Deuteranopia (no green cones) | #2D81F0 | 0.047 |
| Tritanopia (no blue cones) | #0099AD | 0.152 |
| Achromatopsia (no color) | #878787 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637FF2
#637FF2
oklch(63.2% 0.174 270.5)
- #A88500
#A88500
oklch(63.2% 0.129 90)
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 #637FF2, closest first.
No curated palette has a color within ΔE 0.04 of #637FF2.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.018
- Soft Blue #6488EA ΔE 0.028
- Dark Sky Blue #448EE4 ΔE 0.053
- Clear Blue #247AFD ΔE 0.059
- Medium Slate Blue #7B68EE ΔE 0.059
- Cornflower Blue #6495ED ΔE 0.059
- Chefchaouen Blue #4895EF ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.060
Use #637FF2 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.