#1D66AF
Closest named color: Mid Blue (#276AB3). oklch(50.6% 0.135 252.5), rgb(29, 102, 175).
Aa
White text reads best on this color (5.87:1).
About this color
#1D66AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.135 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.015 away. White text reads best on it, at 5.87:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.57:1 |
| White text | 5.87:1 |
Values
| HEX | #1D66AF |
| RGB | rgb(29, 102, 175) |
| HSL | hsl(210, 72%, 40%) |
| OKLCH | oklch(50.6% 0.135 252.5) |
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 #1D66AF | 5.87:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #1D66AF | 3.57:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #1D66AF text on white | 5.87:1 | AA | Lc 79.0 | Fine for body text |
| #1D66AF text on black | 3.57:1 | AA large text | Lc -22.8 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A3C4EA
oklch(80.9% 0.065 252.2)
-
Step 400
400
#70A4E0
oklch(70.6% 0.104 252.8)
-
Step 500
500
#478CD8
oklch(63% 0.135 252.7)
-
Step 600
600
#2675C5
oklch(55.7% 0.145 252.4)
-
Step 700
700 (this color)
#1D66AF
oklch(50.6% 0.135 252.5)
-
Step 800
800
#17508A
oklch(42.7% 0.112 252.6)
-
Step 900
900
#1A436E
oklch(37.7% 0.087 252.1)
-
Step 950
950
#112741
oklch(26.9% 0.056 253.9)
#1D66AF 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) | #426BB2 | 0.035 |
| Deuteranopia (no green cones) | #285EAE | 0.022 |
| Tritanopia (no blue cones) | #007782 | 0.099 |
| Achromatopsia (no color) | #646464 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D66AF
#1D66AF
oklch(50.6% 0.135 252.5)
- #8A5900
#8A5900
oklch(50.6% 0.108 72.4)
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 #1D66AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.015
- French Blue #436BAD ΔE 0.036
- Peacock Blue #016795 ΔE 0.045
- Ocean Blue #03719C ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.050
- Muted Blue #3B719F ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.052
- Dusky Blue #475F94 ΔE 0.053
Use #1D66AF 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.