#659CEF
Closest named color: Cornflower Blue (#6495ED). oklch(69.1% 0.136 258.4), rgb(101, 156, 239).
Aa
Black text reads best on this color (7.55:1).
About this color
#659CEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.136 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.019 away. Black text reads best on it, at 7.55:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.55:1 |
| White text | 2.77:1 |
Values
| HEX | #659CEF |
| RGB | rgb(101, 156, 239) |
| HSL | hsl(216, 81%, 67%) |
| OKLCH | oklch(69.1% 0.136 258.4) |
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 #659CEF | 2.77:1 | Fails | Lc -58.6 | Large or bold text, headings |
| Black text on #659CEF | 7.55:1 | AAA | Lc 50.6 | Large or bold text, headings |
| #659CEF text on white | 2.77:1 | Fails | Lc 53.4 | Large or bold text, headings |
| #659CEF text on black | 7.55:1 | AAA | Lc -48.4 | Large or bold text, headings |
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 400.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9FC3F8
oklch(81% 0.085 257.9)
-
Step 400
400 (this color)
#659CEF
oklch(69.1% 0.136 258.4)
-
Step 500
500
#4087F0
oklch(63.1% 0.173 258.3)
-
Step 600
600
#1C6EDF
oklch(55.7% 0.189 258.3)
-
Step 700
700
#0D5BC2
oklch(49.2% 0.176 258.4)
-
Step 800
800
#104B9D
oklch(42.8% 0.146 258.4)
-
Step 900
900
#163F7C
oklch(37.6% 0.113 258.6)
-
Step 950
950
#0E2649
oklch(27.1% 0.072 258)
#659CEF 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) | #7AA2F2 | 0.030 |
| Deuteranopia (no green cones) | #6895ED | 0.018 |
| Tritanopia (no blue cones) | #00AFBA | 0.119 |
| Achromatopsia (no color) | #9B9B9B | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #659CEF
#659CEF
oklch(69.1% 0.136 258.4)
- #C9901D
#C9901D
oklch(69.2% 0.136 78.7)
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 #659CEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.019
- Chefchaouen Blue #4895EF ΔE 0.035
- Soft Blue #6488EA ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.053
- Periwinkle Blue #8F99FB ΔE 0.054
- Perrywinkle #8F8CE7 ΔE 0.060
- Lavender Blue #8B88F8 ΔE 0.068
- Dodger Blue #1E90FF ΔE 0.068
Use #659CEF 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.