#42689D
Closest named color: French Blue (#436BAD). oklch(51.3% 0.095 256.9), rgb(66, 104, 157).
Aa
White text reads best on this color (5.67:1).
About this color
#42689D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.095 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.026 away. White text reads best on it, at 5.67:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.69:1 |
| White text | 5.67:1 |
Values
| HEX | #42689D |
| RGB | rgb(66, 104, 157) |
| HSL | hsl(215, 41%, 44%) |
| OKLCH | oklch(51.3% 0.095 256.9) |
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 #42689D | 5.67:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #42689D | 3.69:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #42689D text on white | 5.67:1 | AA | Lc 78.2 | Fine for body text |
| #42689D text on black | 3.69:1 | AA large text | Lc -23.5 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CFDAEA
oklch(88.5% 0.025 257.6)
-
Step 300
300
#AEC2DF
oklch(80.8% 0.047 257.6)
-
Step 400
400
#83A3CF
oklch(70.8% 0.074 256.4)
-
Step 500
500
#648BC2
oklch(63.1% 0.094 257)
-
Step 600
600
#4B74AE
oklch(55.5% 0.102 257.2)
-
Step 700
700 (this color)
#42689D
oklch(51.3% 0.095 256.9)
-
Step 800
800
#32507A
oklch(42.8% 0.079 257)
-
Step 900
900
#2C4262
oklch(37.6% 0.062 257.7)
-
Step 950
950
#1A2739
oklch(27% 0.038 256.7)
#42689D 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) | #526C9F | 0.024 |
| Deuteranopia (no green cones) | #47639C | 0.014 |
| Tritanopia (no blue cones) | #00747B | 0.084 |
| Achromatopsia (no color) | #676767 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42689D
#42689D
oklch(51.3% 0.095 256.9)
- #855F1C
#855F1C
oklch(51.3% 0.095 77.3)
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 #42689D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.026
- Muted Blue #3B719F ΔE 0.026
- Dusky Blue #475F94 ΔE 0.026
- Denim #3B638C ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.032
- Mid Blue #276AB3 ΔE 0.039
- Dull Blue #49759C ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.041
Use #42689D 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.