#1D59B5
Closest named color: Mid Blue (#276AB3). oklch(48% 0.158 259.3), rgb(29, 89, 181).
Aa
White text reads best on this color (6.66:1).
About this color
#1D59B5 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.158 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.049 away. White text reads best on it, at 6.66:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.14:1 |
| White text | 6.66:1 |
Values
| HEX | #1D59B5 |
| RGB | rgb(29, 89, 181) |
| HSL | hsl(216, 72%, 41%) |
| OKLCH | oklch(48% 0.158 259.3) |
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 #1D59B5 | 6.66:1 | AA | Lc -87.5 | Fine for body text |
| Black text on #1D59B5 | 3.14:1 | AA large text | Lc 21.6 | Dividers and decoration only |
| #1D59B5 text on white | 6.66:1 | AA | Lc 82.4 | Fine for body text |
| #1D59B5 text on black | 3.14:1 | AA large text | Lc -19.5 | 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 700.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A3C2F3
oklch(80.9% 0.077 259.4)
-
Step 400
400
#71A1ED
oklch(70.7% 0.124 259.3)
-
Step 500
500
#4B88E7
oklch(63.2% 0.157 259)
-
Step 600
600
#2E6FD5
oklch(55.6% 0.171 259.3)
-
Step 700
700 (this color)
#1D59B5
oklch(48% 0.158 259.3)
-
Step 800
800
#1D4C95
oklch(42.7% 0.131 259.2)
-
Step 900
900
#1D4077
oklch(37.7% 0.102 259.2)
-
Step 950
950
#122646
oklch(27.1% 0.065 259.4)
#1D59B5 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) | #1D63B8 | 0.027 |
| Deuteranopia (no green cones) | #0056B3 | 0.016 |
| Tritanopia (no blue cones) | #006F7E | 0.121 |
| Achromatopsia (no color) | #5C5C5C | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D59B5
#1D59B5
oklch(48% 0.158 259.3)
- #7B5600
#7B5600
oklch(48% 0.1 79.7)
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 #1D59B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.049
- Blue Blue #2242C7 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.062
- Dusk Blue #26538D ΔE 0.064
- French Blue #436BAD ΔE 0.067
- Dusky Blue #475F94 ΔE 0.070
- Peacock Blue #016795 ΔE 0.071
- Cobalt #1E488F ΔE 0.074
Use #1D59B5 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.