#577EAF
Closest named color: Off Blue (#5684AE). oklch(58.5% 0.088 254.6), rgb(87, 126, 175).
Aa
Black text reads best on this color (5.00:1).
About this color
#577EAF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.088 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.018 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #577EAF |
| RGB | rgb(87, 126, 175) |
| HSL | hsl(213, 35%, 51%) |
| OKLCH | oklch(58.5% 0.088 254.6) |
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 #577EAF | 4.19:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #577EAF | 5.00:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #577EAF text on white | 4.19:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #577EAF text on black | 5.00:1 | AA | Lc -32.9 | 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 600.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D0DAE8
oklch(88.5% 0.022 256.7)
-
Step 300
300
#B0C2DA
oklch(80.8% 0.039 255.6)
-
Step 400
400
#86A3C8
oklch(70.7% 0.063 254.7)
-
Step 500
500
#688CBA
oklch(63.2% 0.081 254.9)
-
Step 600
600 (this color)
#577EAF
oklch(58.5% 0.088 254.6)
-
Step 700
700
#3F628E
oklch(49% 0.082 254.8)
-
Step 800
800
#355073
oklch(42.6% 0.067 255.3)
-
Step 900
900
#2E435D
oklch(37.7% 0.052 254.2)
-
Step 950
950
#1B2737
oklch(26.9% 0.034 255.8)
#577EAF 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) | #6B80B1 | 0.026 |
| Deuteranopia (no green cones) | #6078AE | 0.019 |
| Tritanopia (no blue cones) | #2E898F | 0.077 |
| Achromatopsia (no color) | #7C7C7C | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577EAF
#577EAF
oklch(58.5% 0.088 254.6)
- #9A743C
#9A743C
oklch(58.5% 0.088 75.2)
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 #577EAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.018
- Steel Blue #4682B4 ΔE 0.019
- Cool Blue #4984B8 ΔE 0.021
- Dusty Blue #5A86AD ΔE 0.025
- Stormy Blue #507B9C ΔE 0.031
- Cerulean #457B9D ΔE 0.036
- Dull Blue #49759C ΔE 0.041
- Faded Blue #658CBB ΔE 0.046
Use #577EAF 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.