#1D66C0
Closest named color: Mid Blue (#276AB3). oklch(51.7% 0.158 256.3), rgb(29, 102, 192).
Aa
White text reads best on this color (5.65:1).
About this color
#1D66C0 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.158 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.026 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #1D66C0 |
| RGB | rgb(29, 102, 192) |
| HSL | hsl(213, 74%, 43%) |
| OKLCH | oklch(51.7% 0.158 256.3) |
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 #1D66C0 | 5.65:1 | AA | Lc -83.0 | Fine for body text |
| Black text on #1D66C0 | 3.71:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #1D66C0 text on white | 5.65:1 | AA | Lc 77.7 | Fine for body text |
| #1D66C0 text on black | 3.71:1 | AA large text | Lc -24.0 | 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 700.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#A1C3F2
oklch(80.9% 0.076 256.6)
-
Step 400
400
#6DA3EC
oklch(70.8% 0.122 256.3)
-
Step 500
500
#4489E5
oklch(63% 0.156 256.5)
-
Step 600
600
#2171D4
oklch(55.6% 0.17 256.4)
-
Step 700
700 (this color)
#1D66C0
oklch(51.7% 0.158 256.3)
-
Step 800
800
#144D94
oklch(42.6% 0.13 256.5)
-
Step 900
900
#184176
oklch(37.7% 0.101 256.3)
-
Step 950
950
#0F2645
oklch(26.9% 0.065 256.6)
#1D66C0 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) | #346FC3 | 0.032 |
| Deuteranopia (no green cones) | #0060BE | 0.021 |
| Tritanopia (no blue cones) | #007C89 | 0.121 |
| Achromatopsia (no color) | #676767 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D66C0
#1D66C0
oklch(51.7% 0.158 256.3)
- #8B5E00
#8B5E00
oklch(51.7% 0.108 76.3)
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 #1D66C0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.026
- French Blue #436BAD ΔE 0.046
- Windows Blue #3778BF ΔE 0.056
- Royal Blue #4169E1 ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.063
- Nice Blue #107AB0 ΔE 0.066
- Warm Blue #4B57DB ΔE 0.068
- Muted Blue #3B719F ΔE 0.070
Use #1D66C0 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.