#557F99
Closest named color: Stormy Blue (#507B9C). oklch(57.6% 0.061 236.5), rgb(85, 127, 153).
Aa
Black text reads best on this color (4.88:1).
About this color
#557F99 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.061 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.016 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.88:1 |
| White text | 4.30:1 |
Values
| HEX | #557F99 |
| RGB | rgb(85, 127, 153) |
| HSL | hsl(203, 29%, 47%) |
| OKLCH | oklch(57.6% 0.061 236.5) |
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 #557F99 | 4.30:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #557F99 | 4.88:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #557F99 text on white | 4.30:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #557F99 text on black | 4.88:1 | AA | Lc -32.0 | 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
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE2
oklch(88.5% 0.015 235.4)
-
Step 300
300
#B1C4D0
oklch(81% 0.027 235.4)
-
Step 400
400
#87A5B9
oklch(70.6% 0.044 237.4)
-
Step 500
500
#688FA8
oklch(63.1% 0.057 237)
-
Step 600
600 (this color)
#557F99
oklch(57.6% 0.061 236.5)
-
Step 700
700
#40667D
oklch(49.1% 0.057 236.2)
-
Step 800
800
#355366
oklch(42.7% 0.048 237.2)
-
Step 900
900
#2E4553
oklch(37.7% 0.037 235.8)
-
Step 950
950
#1B2830
oklch(26.9% 0.023 235.8)
#557F99 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) | #737E9A | 0.038 |
| Deuteranopia (no green cones) | #6A7799 | 0.033 |
| Tritanopia (no blue cones) | #398687 | 0.049 |
| Achromatopsia (no color) | #7A7A7A | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557F99
#557F99
oklch(57.6% 0.061 236.5)
- #967055
#967055
oklch(57.6% 0.062 56.5)
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 #557F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.016
- Grey Blue #647D8E ΔE 0.022
- Cerulean #457B9D ΔE 0.023
- Off Blue #5684AE ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.034
- Dull Blue #49759C ΔE 0.036
- Slate Gray #708090 ΔE 0.036
- Metallic Blue #4F738E ΔE 0.037
Use #557F99 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.