#1F759D
Closest named color: Ocean Blue (#03719C). oklch(53.2% 0.1 234), rgb(31, 117, 157).
Aa
White text reads best on this color (5.13:1).
About this color
#1F759D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.100 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.016 away. White text reads best on it, at 5.13:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 4.08:1 |
| White text | 5.13:1 |
Values
| HEX | #1F759D |
| RGB | rgb(31, 117, 157) |
| HSL | hsl(199, 67%, 37%) |
| OKLCH | oklch(53.2% 0.1 234) |
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 #1F759D | 5.13:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #1F759D | 4.08:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #1F759D text on white | 5.13:1 | AA | Lc 75.0 | Fine for body text |
| #1F759D text on black | 4.08:1 | AA large text | Lc -26.7 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A5C6DA
oklch(80.9% 0.045 234.7)
-
Step 400
400
#73A9C7
oklch(70.8% 0.072 233.5)
-
Step 500
500
#4B93B9
oklch(63.2% 0.092 233.9)
-
Step 600
600 (this color)
#1F759D
oklch(53.2% 0.1 234)
-
Step 700
700
#1A698D
oklch(49.2% 0.092 233.6)
-
Step 800
800
#195572
oklch(42.6% 0.077 234)
-
Step 900
900
#1C475C
oklch(37.8% 0.059 232.6)
-
Step 950
950
#122936
oklch(26.9% 0.038 235.3)
#1F759D 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) | #61749F | 0.062 |
| Deuteranopia (no green cones) | #51689C | 0.053 |
| Tritanopia (no blue cones) | #008083 | 0.062 |
| Achromatopsia (no color) | #6E6E6E | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F759D
#1F759D
oklch(53.2% 0.1 234)
- #985B2F
#985B2F
oklch(53.2% 0.099 54.4)
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 #1F759D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.016
- Sea Blue #047495 ΔE 0.017
- Muted Blue #3B719F ΔE 0.022
- Flat Blue #3C73A8 ΔE 0.029
- Ocean #017B92 ΔE 0.030
- Nice Blue #107AB0 ΔE 0.030
- Dull Blue #49759C ΔE 0.033
- Cerulean #457B9D ΔE 0.036
Use #1F759D 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.