#1F77DE
Closest named color: Cerulean Blue (#056EEE). oklch(57.6% 0.176 255.8), rgb(31, 119, 222).
Aa
Black text reads best on this color (4.75:1).
About this color
#1F77DE is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.176 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.036 away. Black text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.75:1 |
| White text | 4.41:1 |
Values
| HEX | #1F77DE |
| RGB | rgb(31, 119, 222) |
| HSL | hsl(212, 75%, 50%) |
| OKLCH | oklch(57.6% 0.176 255.8) |
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 #1F77DE | 4.41:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #1F77DE | 4.75:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #1F77DE text on white | 4.41:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #1F77DE text on black | 4.75:1 | AA | Lc -31.6 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9FC3F4
oklch(80.8% 0.08 256.2)
-
Step 400
400
#69A3EE
oklch(70.7% 0.126 255.4)
-
Step 500
500
#3E89E9
oklch(63% 0.163 256)
-
Step 600
600 (this color)
#1F77DE
oklch(57.6% 0.176 255.8)
-
Step 700
700
#045EBB
oklch(49.2% 0.164 255.8)
-
Step 800
800
#0B4D97
oklch(42.7% 0.136 255.8)
-
Step 900
900
#144178
oklch(37.7% 0.106 255.7)
-
Step 950
950
#0D2646
oklch(26.8% 0.067 255.9)
#1F77DE 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) | #3D81E2 | 0.036 |
| Deuteranopia (no green cones) | #0070DC | 0.022 |
| Tritanopia (no blue cones) | #0090A0 | 0.132 |
| Achromatopsia (no color) | #787878 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F77DE
#1F77DE
oklch(57.6% 0.176 255.8)
- #A26D00
#A26D00
oklch(57.6% 0.121 75.3)
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 #1F77DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.039
- Clear Blue #247AFD ΔE 0.047
- Windows Blue #3778BF ΔE 0.050
- Water Blue #0E87CC ΔE 0.055
- Neon Blue #4361EE ΔE 0.062
- Bright Blue #0165FC ΔE 0.067
- Azul #1D5DEC ΔE 0.069
Use #1F77DE 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.