#0577BA
Closest named color: Nice Blue (#107AB0). oklch(54.9% 0.135 244.5), rgb(5, 119, 186).
Aa
White text reads best on this color (4.82:1).
About this color
#0577BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.135 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.020 away. White text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.35:1 |
| White text | 4.82:1 |
Values
| HEX | #0577BA |
| RGB | rgb(5, 119, 186) |
| HSL | hsl(202, 95%, 37%) |
| OKLCH | oklch(54.9% 0.135 244.5) |
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 #0577BA | 4.82:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #0577BA | 4.35:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #0577BA text on white | 4.82:1 | AA | Lc 72.8 | Content text, not long reading |
| #0577BA text on black | 4.35:1 | AA large text | Lc -28.9 | Dividers and decoration only |
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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF5
oklch(93.5% 0.018 245.4)
-
Step 200
200
#C7DCEE
oklch(88.4% 0.034 244)
-
Step 300
300
#A0C6E6
oklch(81% 0.061 244)
-
Step 400
400
#6AA7D9
oklch(70.7% 0.097 244.5)
-
Step 500
500
#3C90CF
oklch(63.1% 0.125 244.5)
-
Step 600
600 (this color)
#0577BA
oklch(54.9% 0.135 244.5)
-
Step 700
700
#0066A1
oklch(49.2% 0.123 244.5)
-
Step 800
800
#045384
oklch(42.7% 0.105 244.8)
-
Step 900
900
#124569
oklch(37.6% 0.081 244.2)
-
Step 950
950
#0D293E
oklch(27.1% 0.052 244.2)
#0577BA 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) | #567ABD | 0.056 |
| Deuteranopia (no green cones) | #3D6BB9 | 0.040 |
| Tritanopia (no blue cones) | #00878F | 0.093 |
| Achromatopsia (no color) | #727272 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0577BA
#0577BA
oklch(54.9% 0.135 244.5)
- #A25F00
#A25F00
oklch(54.9% 0.124 64.4)
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 #0577BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.020
- Windows Blue #3778BF ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.036
- Mid Blue #276AB3 ΔE 0.036
- French Blue #436BAD ΔE 0.044
- Muted Blue #3B719F ΔE 0.046
- Ocean Blue #03719C ΔE 0.048
- Water Blue #0E87CC ΔE 0.050
Use #0577BA 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.