#507FBC
Closest named color: Cool Blue (#4984B8). oklch(59% 0.107 255.5), rgb(80, 127, 188).
Aa
Black text reads best on this color (5.10:1).
About this color
#507FBC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.107 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.018 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #507FBC |
| RGB | rgb(80, 127, 188) |
| HSL | hsl(214, 45%, 53%) |
| OKLCH | oklch(59% 0.107 255.5) |
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 #507FBC | 4.11:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #507FBC | 5.10:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #507FBC text on white | 4.11:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #507FBC 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
#CEDAEB
oklch(88.4% 0.027 257)
-
Step 300
300
#ACC3E0
oklch(80.9% 0.048 254.3)
-
Step 400
400
#80A3D1
oklch(70.7% 0.078 255.5)
-
Step 500
500
#608CC4
oklch(63.2% 0.098 254.9)
-
Step 600
600 (this color)
#507FBC
oklch(59% 0.107 255.5)
-
Step 700
700
#386298
oklch(49.2% 0.099 255.4)
-
Step 800
800
#2E507B
oklch(42.7% 0.082 255.1)
-
Step 900
900
#2A4363
oklch(37.8% 0.063 255.1)
-
Step 950
950
#19273A
oklch(27% 0.041 256.3)
#507FBC 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) | #6683BF | 0.029 |
| Deuteranopia (no green cones) | #5878BB | 0.020 |
| Tritanopia (no blue cones) | #008D95 | 0.094 |
| Achromatopsia (no color) | #7D7D7D | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #507FBC
#507FBC
oklch(59% 0.107 255.5)
- #A27327
#A27327
oklch(59% 0.108 75.3)
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 #507FBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.018
- Steel Blue #4682B4 ΔE 0.019
- Off Blue #5684AE ΔE 0.030
- Windows Blue #3778BF ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.036
- Water Blue #0E87CC ΔE 0.044
- Faded Blue #658CBB ΔE 0.047
- Stormy Blue #507B9C ΔE 0.049
Use #507FBC 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.