#3591C5
Closest named color: Cool Blue (#4984B8). oklch(62.6% 0.116 237.8), rgb(53, 145, 197).
Aa
Black text reads best on this color (6.00:1).
About this color
#3591C5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.116 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.037 away. Black text reads best on it, at 6.00:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 6.00:1 |
| White text | 3.49:1 |
Values
| HEX | #3591C5 |
| RGB | rgb(53, 145, 197) |
| HSL | hsl(202, 58%, 49%) |
| OKLCH | oklch(62.6% 0.116 237.8) |
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 #3591C5 | 3.49:1 | AA large text | Lc -67.7 | Content text, not long reading |
| Black text on #3591C5 | 6.00:1 | AA | Lc 41.9 | Non-text elements, placeholder text |
| #3591C5 text on white | 3.49:1 | AA large text | Lc 62.2 | Content text, not long reading |
| #3591C5 text on black | 6.00:1 | AA | Lc -39.5 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C7DDEC
oklch(88.6% 0.031 237.6)
-
Step 300
300
#9FC7E1
oklch(81% 0.056 236.9)
-
Step 400
400
#68A9D2
oklch(70.7% 0.09 237.6)
-
Step 500
500 (this color)
#3591C5
oklch(62.6% 0.116 237.8)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#0E4765
oklch(37.8% 0.076 237.6)
-
Step 950
950
#0B2A3B
oklch(27.1% 0.048 236.5)
#3591C5 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) | #7891C7 | 0.065 |
| Deuteranopia (no green cones) | #6583C4 | 0.053 |
| Tritanopia (no blue cones) | #009EA3 | 0.076 |
| Achromatopsia (no color) | #898989 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3591C5
#3591C5
oklch(62.6% 0.116 237.8)
- #BB743A
#BB743A
oklch(62.4% 0.116 57.5)
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 #3591C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.037
- Water Blue #0E87CC ΔE 0.039
- Blue NCS #118AB2 ΔE 0.039
- Faded Blue #658CBB ΔE 0.042
- Steel Blue #4682B4 ΔE 0.044
- Dusty Blue #5A86AD ΔE 0.047
- Off Blue #5684AE ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.052
Use #3591C5 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.