#638BF2
Closest named color: Soft Blue (#6488EA). oklch(65.6% 0.16 266.1), rgb(99, 139, 242).
Aa
Black text reads best on this color (6.50:1).
About this color
#638BF2 is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.160 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.013 away. Black text reads best on it, at 6.50:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.50:1 |
| White text | 3.22:1 |
Values
| HEX | #638BF2 |
| RGB | rgb(99, 139, 242) |
| HSL | hsl(223, 85%, 67%) |
| OKLCH | oklch(65.6% 0.16 266.1) |
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 #638BF2 | 3.22:1 | AA large text | Lc -64.7 | Content text, not long reading |
| Black text on #638BF2 | 6.50:1 | AA | Lc 44.8 | Non-text elements, placeholder text |
| #638BF2 text on white | 3.22:1 | AA large text | Lc 59.3 | Large or bold text, headings |
| #638BF2 text on black | 6.50:1 | AA | Lc -42.4 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#A9C0F4
oklch(80.9% 0.078 266.1)
-
Step 400
400
#7C9EEF
oklch(70.8% 0.125 266)
-
Step 500
500 (this color)
#638BF2
oklch(65.6% 0.16 266.1)
-
Step 600
600
#436AD8
oklch(55.6% 0.174 266.1)
-
Step 700
700
#3558BB
oklch(49.2% 0.161 266)
-
Step 800
800
#2C4897
oklch(42.6% 0.134 266.1)
-
Step 900
900
#273D78
oklch(37.6% 0.104 266.1)
-
Step 950
950
#172446
oklch(26.9% 0.066 266.3)
#638BF2 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) | #5D96F6 | 0.028 |
| Deuteranopia (no green cones) | #4889F0 | 0.028 |
| Tritanopia (no blue cones) | #00A2B3 | 0.139 |
| Achromatopsia (no color) | #8F8F8F | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638BF2
#638BF2
oklch(65.6% 0.16 266.1)
- #B58A00
#B58A00
oklch(65.7% 0.134 86.4)
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 #638BF2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.013
- Cornflower Blue #6495ED ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.038
- Cornflower #6A79F7 ΔE 0.046
- Dodger Blue #1E90FF ΔE 0.050
- Lavender Blue #8B88F8 ΔE 0.051
- Perrywinkle #8F8CE7 ΔE 0.058
Use #638BF2 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.