#659CBF
Closest named color: Greyblue (#77A1B5). oklch(66.8% 0.078 237.5), rgb(101, 156, 191).
Aa
Black text reads best on this color (7.06:1).
About this color
#659CBF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.078 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.031 away. Black text reads best on it, at 7.06:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.06:1 |
| White text | 2.97:1 |
Values
| HEX | #659CBF |
| RGB | rgb(101, 156, 191) |
| HSL | hsl(203, 41%, 57%) |
| OKLCH | oklch(66.8% 0.078 237.5) |
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 #659CBF | 2.97:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #659CBF | 7.06:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #659CBF text on white | 2.97:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #659CBF text on black | 7.06:1 | AAA | Lc -45.5 | 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 500.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CDDCE6
oklch(88.6% 0.021 236.8)
-
Step 300
300
#AAC5D7
oklch(80.9% 0.039 237.2)
-
Step 400
400
#7DA7C2
oklch(70.8% 0.06 236.9)
-
Step 500
500 (this color)
#659CBF
oklch(66.8% 0.078 237.5)
-
Step 600
600
#3E7A9F
oklch(55.5% 0.085 238)
-
Step 700
700
#2F6788
oklch(49.1% 0.079 237.3)
-
Step 800
800
#28546E
oklch(42.6% 0.065 236.9)
-
Step 900
900
#264659
oklch(37.8% 0.05 236.2)
-
Step 950
950
#172934
oklch(27.1% 0.031 236.4)
#659CBF 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) | #8C9BC1 | 0.047 |
| Deuteranopia (no green cones) | #8091BE | 0.041 |
| Tritanopia (no blue cones) | #3CA5A7 | 0.062 |
| Achromatopsia (no color) | #969696 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #659CBF
#659CBF
oklch(66.8% 0.078 237.5)
- #B98965
#B98965
oklch(66.8% 0.077 57.8)
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 #659CBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.031
- Faded Blue #658CBB ΔE 0.044
- Silver Lake Blue #778DA9 ΔE 0.047
- Bluegrey #85A3B2 ΔE 0.049
- Bluey Grey #89A0B0 ΔE 0.050
- Blue Grey #758DA3 ΔE 0.051
- Cadet Blue #5F9EA0 ΔE 0.051
- Cool Gray #8D99AE ΔE 0.051
Use #659CBF 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.