#537FE9
Closest named color: Soft Blue (#6488EA). oklch(61.8% 0.167 265), rgb(83, 127, 233).
Aa
Black text reads best on this color (5.58:1).
About this color
#537FE9 is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.167 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.032 away. Black text reads best on it, at 5.58:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 5.58:1 |
| White text | 3.76:1 |
Values
| HEX | #537FE9 |
| RGB | rgb(83, 127, 233) |
| HSL | hsl(222, 77%, 62%) |
| OKLCH | oklch(61.8% 0.167 265) |
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 #537FE9 | 3.76:1 | AA large text | Lc -70.4 | Content text, not long reading |
| Black text on #537FE9 | 5.58:1 | AA | Lc 39.2 | Non-text elements, placeholder text |
| #537FE9 text on white | 3.76:1 | AA large text | Lc 64.9 | Content text, not long reading |
| #537FE9 text on black | 5.58:1 | AA | Lc -36.8 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBD9F8
oklch(88.5% 0.045 266.2)
-
Step 300
300
#A7C0F6
oklch(80.8% 0.082 265.3)
-
Step 400
400
#789EF2
oklch(70.7% 0.131 264.8)
-
Step 500
500 (this color)
#537FE9
oklch(61.8% 0.167 265)
-
Step 600
600
#3D6ADC
oklch(55.6% 0.182 264.8)
-
Step 700
700
#3057BF
oklch(49% 0.169 265.1)
-
Step 800
800
#28489A
oklch(42.7% 0.139 265)
-
Step 900
900
#243D7B
oklch(37.6% 0.11 265)
-
Step 950
950
#152448
oklch(26.9% 0.07 265)
#537FE9 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) | #4B8BED | 0.030 |
| Deuteranopia (no green cones) | #2F7DE7 | 0.032 |
| Tritanopia (no blue cones) | #0097A9 | 0.138 |
| Achromatopsia (no color) | #848484 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537FE9
#537FE9
oklch(61.8% 0.167 265)
- #A87E00
#A87E00
oklch(61.7% 0.127 85)
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 #537FE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.032
- Cornflower #6A79F7 ΔE 0.037
- Dark Sky Blue #448EE4 ΔE 0.042
- Clear Blue #247AFD ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.056
- Royal Blue #4169E1 ΔE 0.062
- Cornflower Blue #6495ED ΔE 0.063
Use #537FE9 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.