#537FB9
Closest named color: Cool Blue (#4984B8). oklch(59% 0.102 255.8), rgb(83, 127, 185).
Aa
Black text reads best on this color (5.10:1).
About this color
#537FB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.102 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.017 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #537FB9 |
| RGB | rgb(83, 127, 185) |
| HSL | hsl(214, 42%, 53%) |
| OKLCH | oklch(59% 0.102 255.8) |
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 #537FB9 | 4.11:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #537FB9 | 5.10:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #537FB9 text on white | 4.11:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #537FB9 text on black | 5.10:1 | AA | Lc -33.5 | 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 600.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEA
oklch(88.4% 0.026 255.6)
-
Step 300
300
#AEC3DF
oklch(81% 0.046 255.7)
-
Step 400
400
#82A3CE
oklch(70.7% 0.073 255.2)
-
Step 500
500
#638CC2
oklch(63.2% 0.094 255.6)
-
Step 600
600 (this color)
#537FB9
oklch(59% 0.102 255.8)
-
Step 700
700
#3A6296
oklch(49.1% 0.095 255.6)
-
Step 800
800
#315079
oklch(42.7% 0.078 255.9)
-
Step 900
900
#2B4362
oklch(37.8% 0.061 255.3)
-
Step 950
950
#1A2739
oklch(27% 0.038 256.7)
#537FB9 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) | #6882BB | 0.027 |
| Deuteranopia (no green cones) | #5B79B8 | 0.018 |
| Tritanopia (no blue cones) | #118C94 | 0.090 |
| Achromatopsia (no color) | #7D7D7D | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537FB9
#537FB9
oklch(59% 0.102 255.8)
- #A0742E
#A0742E
oklch(59% 0.102 75.8)
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 #537FB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.017
- Steel Blue #4682B4 ΔE 0.018
- Off Blue #5684AE ΔE 0.025
- Dusty Blue #5A86AD ΔE 0.032
- Windows Blue #3778BF ΔE 0.037
- Faded Blue #658CBB ΔE 0.044
- Stormy Blue #507B9C ΔE 0.045
- Cerulean #457B9D ΔE 0.047
Use #537FB9 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.