#577D97
Closest named color: Stormy Blue (#507B9C). oklch(57.2% 0.059 239), rgb(87, 125, 151).
Aa
Black text reads best on this color (4.78:1).
About this color
#577D97 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.059 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.014 away. Black text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.78:1 |
| White text | 4.38:1 |
Values
| HEX | #577D97 |
| RGB | rgb(87, 125, 151) |
| HSL | hsl(204, 27%, 47%) |
| OKLCH | oklch(57.2% 0.059 239) |
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 #577D97 | 4.38:1 | AA large text | Lc -75.8 | Fine for body text |
| Black text on #577D97 | 4.78:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #577D97 text on white | 4.38:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #577D97 text on black | 4.78:1 | AA | Lc -31.3 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE2
oklch(88.6% 0.015 238)
-
Step 300
300
#B2C3D0
oklch(80.8% 0.026 240.7)
-
Step 400
400
#89A5B8
oklch(70.7% 0.042 237.9)
-
Step 500
500
#6B8EA7
oklch(63% 0.054 239.8)
-
Step 600
600 (this color)
#577D97
oklch(57.2% 0.059 239)
-
Step 700
700
#43657D
oklch(49.1% 0.055 240.1)
-
Step 800
800
#375365
oklch(42.8% 0.045 237.4)
-
Step 900
900
#304452
oklch(37.6% 0.035 239.4)
-
Step 950
950
#1C2830
oklch(26.9% 0.022 237.9)
#577D97 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) | #727C98 | 0.035 |
| Deuteranopia (no green cones) | #697597 | 0.031 |
| Tritanopia (no blue cones) | #3E8485 | 0.048 |
| Achromatopsia (no color) | #787878 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577D97
#577D97
oklch(57.2% 0.059 239)
- #927055
#927055
oklch(57.2% 0.058 59.7)
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 #577D97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.014
- Grey Blue #647D8E ΔE 0.020
- Cerulean #457B9D ΔE 0.023
- Metallic Blue #4F738E ΔE 0.032
- Dull Blue #49759C ΔE 0.033
- Battleship Grey #6B7C85 ΔE 0.035
- Slate Gray #708090 ΔE 0.035
- Off Blue #5684AE ΔE 0.036
Use #577D97 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.