#1F66C7
Closest named color: Mid Blue (#276AB3). oklch(52.3% 0.166 257.8), rgb(31, 102, 199).
Aa
White text reads best on this color (5.55:1).
About this color
#1F66C7 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.166 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.035 away. White text reads best on it, at 5.55:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.78:1 |
| White text | 5.55:1 |
Values
| HEX | #1F66C7 |
| RGB | rgb(31, 102, 199) |
| HSL | hsl(215, 73%, 45%) |
| OKLCH | oklch(52.3% 0.166 257.8) |
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 #1F66C7 | 5.55:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #1F66C7 | 3.78:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #1F66C7 text on white | 5.55:1 | AA | Lc 77.2 | Fine for body text |
| #1F66C7 text on black | 3.78:1 | AA large text | Lc -24.6 | 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
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#A0C3F5
oklch(80.9% 0.081 257.3)
-
Step 400
400
#6CA2F0
oklch(70.8% 0.129 257.6)
-
Step 500
500
#4388EB
oklch(63.1% 0.165 257.8)
-
Step 600
600
#216FD9
oklch(55.6% 0.179 257.8)
-
Step 700
700 (this color)
#1F66C7
oklch(52.3% 0.166 257.8)
-
Step 800
800
#144C98
oklch(42.7% 0.137 257.8)
-
Step 900
900
#184079
oklch(37.7% 0.107 257.9)
-
Step 950
950
#0F2647
oklch(27% 0.068 257.7)
#1F66C7 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) | #2C70CB | 0.030 |
| Deuteranopia (no green cones) | #0061C5 | 0.019 |
| Tritanopia (no blue cones) | #007E8D | 0.127 |
| Achromatopsia (no color) | #686868 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F66C7
#1F66C7
oklch(52.3% 0.166 257.8)
- #8C6000
#8C6000
oklch(52.3% 0.109 77.5)
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 #1F66C7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.035
- Royal Blue #4169E1 ΔE 0.051
- French Blue #436BAD ΔE 0.053
- Windows Blue #3778BF ΔE 0.058
- Warm Blue #4B57DB ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.061
- Azul #1D5DEC ΔE 0.062
- Neon Blue #4361EE ΔE 0.069
Use #1F66C7 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.