#618DDB
Closest named color: Dark Sky Blue (#448EE4). oklch(64.6% 0.127 261.2), rgb(97, 141, 219).
Aa
Black text reads best on this color (6.34:1).
About this color
#618DDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.127 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.029 away. Black text reads best on it, at 6.34:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.34:1 |
| White text | 3.31:1 |
Values
| HEX | #618DDB |
| RGB | rgb(97, 141, 219) |
| HSL | hsl(218, 63%, 62%) |
| OKLCH | oklch(64.6% 0.127 261.2) |
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 #618DDB | 3.31:1 | AA large text | Lc -65.8 | Content text, not long reading |
| Black text on #618DDB | 6.34:1 | AA | Lc 43.7 | Non-text elements, placeholder text |
| #618DDB text on white | 3.31:1 | AA large text | Lc 60.3 | Content text, not long reading |
| #618DDB text on black | 6.34:1 | AA | Lc -41.4 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#AAC2EA
oklch(81% 0.063 260.6)
-
Step 400
400
#7DA1DF
oklch(70.7% 0.1 261)
-
Step 500
500 (this color)
#618DDB
oklch(64.6% 0.127 261.2)
-
Step 600
600
#4371C3
oklch(55.7% 0.137 261.1)
-
Step 700
700
#355EA9
oklch(49.2% 0.129 261.4)
-
Step 800
800
#2C4D89
oklch(42.7% 0.107 261.3)
-
Step 900
900
#28416D
oklch(37.8% 0.082 261)
-
Step 950
950
#172640
oklch(27% 0.053 260.8)
#618DDB 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) | #6D93DE | 0.023 |
| Deuteranopia (no green cones) | #5E88D9 | 0.014 |
| Tritanopia (no blue cones) | #0A9EAA | 0.113 |
| Achromatopsia (no color) | #8D8D8D | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #618DDB
#618DDB
oklch(64.6% 0.127 261.2)
- #B58518
#B58518
oklch(64.7% 0.127 81.5)
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 #618DDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.029
- Soft Blue #6488EA ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.037
- Faded Blue #658CBB ΔE 0.048
- Perrywinkle #8F8CE7 ΔE 0.062
- Cool Blue #4984B8 ΔE 0.063
- Water Blue #0E87CC ΔE 0.066
Use #618DDB 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.