#557FDB
Closest named color: Soft Blue (#6488EA). oklch(61% 0.147 264), rgb(85, 127, 219).
Aa
Black text reads best on this color (5.44:1).
About this color
#557FDB is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.147 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.037 away. Black text reads best on it, at 5.44:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 5.44:1 |
| White text | 3.85:1 |
Values
| HEX | #557FDB |
| RGB | rgb(85, 127, 219) |
| HSL | hsl(221, 65%, 60%) |
| OKLCH | oklch(61% 0.147 264) |
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 #557FDB | 3.85:1 | AA large text | Lc -71.3 | Content text, not long reading |
| Black text on #557FDB | 5.44:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #557FDB text on white | 3.85:1 | AA large text | Lc 65.8 | Content text, not long reading |
| #557FDB text on black | 5.44:1 | AA | Lc -35.9 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#A9C1F0
oklch(80.9% 0.072 263.7)
-
Step 400
400
#7C9FE9
oklch(70.7% 0.116 264.3)
-
Step 500
500 (this color)
#557FDB
oklch(61% 0.147 264)
-
Step 600
600
#426DD0
oklch(55.6% 0.16 264.2)
-
Step 700
700
#345AB4
oklch(49% 0.149 264.4)
-
Step 800
800
#2B4A92
oklch(42.6% 0.124 264.3)
-
Step 900
900
#273F74
oklch(37.7% 0.096 264)
-
Step 950
950
#172544
oklch(27% 0.061 264.4)
#557FDB 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) | #5688DF | 0.024 |
| Deuteranopia (no green cones) | #427CD9 | 0.022 |
| Tritanopia (no blue cones) | #0094A2 | 0.127 |
| Achromatopsia (no color) | #828282 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557FDB
#557FDB
oklch(61% 0.147 264)
- #A67B00
#A67B00
oklch(60.9% 0.125 83.9)
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 #557FDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.037
- Dark Sky Blue #448EE4 ΔE 0.040
- Cornflower #6A79F7 ΔE 0.053
- Water Blue #0E87CC ΔE 0.055
- Windows Blue #3778BF ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.060
- Cool Blue #4984B8 ΔE 0.060
- Cornflower Blue #6495ED ΔE 0.065
Use #557FDB 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.