#1F77A0
Closest named color: Sea Blue (#047495). oklch(53.8% 0.102 234.1), rgb(31, 119, 160).
Aa
White text reads best on this color (4.99:1).
About this color
#1F77A0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.102 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.022 away. White text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 4.20:1 |
| White text | 4.99:1 |
Values
| HEX | #1F77A0 |
| RGB | rgb(31, 119, 160) |
| HSL | hsl(199, 68%, 37%) |
| OKLCH | oklch(53.8% 0.102 234.1) |
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 #1F77A0 | 4.99:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #1F77A0 | 4.20:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #1F77A0 text on white | 4.99:1 | AA | Lc 74.2 | Content text, not long reading |
| #1F77A0 text on black | 4.20:1 | AA large text | Lc -27.5 | 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
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A5C6DA
oklch(80.9% 0.045 234.7)
-
Step 400
400
#72A9C8
oklch(70.8% 0.073 233.9)
-
Step 500
500
#4993B9
oklch(63.2% 0.093 233.3)
-
Step 600
600 (this color)
#1F77A0
oklch(53.8% 0.102 234.1)
-
Step 700
700
#17698E
oklch(49.2% 0.094 233.8)
-
Step 800
800
#175573
oklch(42.6% 0.078 234.4)
-
Step 900
900
#1B475D
oklch(37.8% 0.061 233.4)
-
Step 950
950
#112936
oklch(26.8% 0.039 234.4)
#1F77A0 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) | #6376A2 | 0.063 |
| Deuteranopia (no green cones) | #526A9F | 0.053 |
| Tritanopia (no blue cones) | #008285 | 0.063 |
| Achromatopsia (no color) | #6F6F6F | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F77A0
#1F77A0
oklch(53.8% 0.102 234.1)
- #9B5C2F
#9B5C2F
oklch(53.7% 0.102 54.1)
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 #1F77A0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.022
- Ocean Blue #03719C ΔE 0.022
- Muted Blue #3B719F ΔE 0.023
- Nice Blue #107AB0 ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.027
- Ocean #017B92 ΔE 0.030
- Dull Blue #49759C ΔE 0.032
- Cerulean #457B9D ΔE 0.032
Use #1F77A0 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.