#507FB3
Closest named color: Steel Blue (#4682B4). oklch(58.5% 0.096 252), rgb(80, 127, 179).
Aa
Black text reads best on this color (5.02:1).
About this color
#507FB3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.096 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.012 away. Black text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.02:1 |
| White text | 4.17:1 |
Values
| HEX | #507FB3 |
| RGB | rgb(80, 127, 179) |
| HSL | hsl(212, 39%, 51%) |
| OKLCH | oklch(58.5% 0.096 252) |
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 #507FB3 | 4.17:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #507FB3 | 5.02:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #507FB3 text on white | 4.17:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #507FB3 text on black | 5.02:1 | AA | Lc -33.0 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CEDBE9
oklch(88.6% 0.024 250.1)
-
Step 300
300
#ADC3DC
oklch(80.9% 0.043 251.7)
-
Step 400
400
#82A4CB
oklch(70.8% 0.069 252.2)
-
Step 500
500
#618DBD
oklch(63.1% 0.087 251.4)
-
Step 600
600 (this color)
#507FB3
oklch(58.5% 0.096 252)
-
Step 700
700
#396392
oklch(49.1% 0.089 252.5)
-
Step 800
800
#2F5176
oklch(42.7% 0.074 251.8)
-
Step 900
900
#2A435F
oklch(37.6% 0.057 252.1)
-
Step 950
950
#192838
oklch(27.1% 0.036 250.8)
#507FB3 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) | #6A81B5 | 0.032 |
| Deuteranopia (no green cones) | #5D78B2 | 0.023 |
| Tritanopia (no blue cones) | #0C8B91 | 0.084 |
| Achromatopsia (no color) | #7C7C7C | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #507FB3
#507FB3
oklch(58.5% 0.096 252)
- #9F7236
#9F7236
oklch(58.6% 0.095 71.8)
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 #507FB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.012
- Cool Blue #4984B8 ΔE 0.015
- Off Blue #5684AE ΔE 0.020
- Dusty Blue #5A86AD ΔE 0.028
- Stormy Blue #507B9C ΔE 0.035
- Cerulean #457B9D ΔE 0.037
- Windows Blue #3778BF ΔE 0.039
- Dull Blue #49759C ΔE 0.043
Use #507FB3 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.