#1F77AC
Closest named color: Nice Blue (#107AB0). oklch(54.5% 0.115 241), rgb(31, 119, 172).
Aa
White text reads best on this color (4.89:1).
About this color
#1F77AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.115 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.010 away. White text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.29:1 |
| White text | 4.89:1 |
Values
| HEX | #1F77AC |
| RGB | rgb(31, 119, 172) |
| HSL | hsl(203, 69%, 40%) |
| OKLCH | oklch(54.5% 0.115 241) |
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 #1F77AC | 4.89:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #1F77AC | 4.29:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #1F77AC text on white | 4.89:1 | AA | Lc 73.5 | Content text, not long reading |
| #1F77AC text on black | 4.29:1 | AA large text | Lc -28.2 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C6DF
oklch(81% 0.051 240.1)
-
Step 400
400
#71A7CF
oklch(70.6% 0.082 241.4)
-
Step 500
500
#4791C3
oklch(63.1% 0.105 240.8)
-
Step 600
600 (this color)
#1F77AC
oklch(54.5% 0.115 241)
-
Step 700
700
#146797
oklch(49.1% 0.106 240.9)
-
Step 800
800
#15547A
oklch(42.6% 0.088 240.7)
-
Step 900
900
#1A4663
oklch(37.8% 0.069 241)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#1F77AC 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) | #5E78AE | 0.057 |
| Deuteranopia (no green cones) | #4B6BAB | 0.045 |
| Tritanopia (no blue cones) | #00848A | 0.076 |
| Achromatopsia (no color) | #717171 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F77AC
#1F77AC
oklch(54.5% 0.115 241)
- #9F5E1B
#9F5E1B
oklch(54.5% 0.115 61)
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 #1F77AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.010
- Flat Blue #3C73A8 ΔE 0.020
- Muted Blue #3B719F ΔE 0.027
- Ocean Blue #03719C ΔE 0.032
- Windows Blue #3778BF ΔE 0.035
- Dull Blue #49759C ΔE 0.037
- Sea Blue #047495 ΔE 0.039
- Cerulean #457B9D ΔE 0.040
Use #1F77AC 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.