#1F74D3
Closest named color: Windows Blue (#3778BF). oklch(56.2% 0.166 254.9), rgb(31, 116, 211).
Aa
White text reads best on this color (4.66:1).
About this color
#1F74D3 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.166 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.037 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.49:1 |
| White text | 4.66:1 |
Values
| HEX | #1F74D3 |
| RGB | rgb(31, 116, 211) |
| HSL | hsl(212, 74%, 47%) |
| OKLCH | oklch(56.2% 0.166 254.9) |
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 #1F74D3 | 4.66:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #1F74D3 | 4.49:1 | AA large text | Lc 32.2 | Non-text elements, placeholder text |
| #1F74D3 text on white | 4.66:1 | AA | Lc 71.9 | Content text, not long reading |
| #1F74D3 text on black | 4.49:1 | AA large text | Lc -29.8 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C3F1
oklch(80.8% 0.076 255.4)
-
Step 400
400
#6CA3EA
oklch(70.7% 0.12 255.3)
-
Step 500
500
#418AE3
oklch(63% 0.153 255)
-
Step 600
600 (this color)
#1F74D3
oklch(56.2% 0.166 254.9)
-
Step 700
700
#0C5FB5
oklch(49.1% 0.154 254.9)
-
Step 800
800
#104E92
oklch(42.6% 0.127 254.8)
-
Step 900
900
#174275
oklch(37.8% 0.099 254.9)
-
Step 950
950
#0F2744
oklch(27% 0.062 254.6)
#1F74D3 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) | #417DD7 | 0.037 |
| Deuteranopia (no green cones) | #146DD1 | 0.020 |
| Tritanopia (no blue cones) | #008B99 | 0.125 |
| Achromatopsia (no color) | #747474 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F74D3
#1F74D3
oklch(56.2% 0.166 254.9)
- #9D6900
#9D6900
oklch(56.2% 0.119 74.9)
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 #1F74D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.037
- Royal Blue #4169E1 ΔE 0.042
- Cerulean Blue #056EEE ΔE 0.046
- Mid Blue #276AB3 ΔE 0.053
- Water Blue #0E87CC ΔE 0.055
- Nice Blue #107AB0 ΔE 0.061
- French Blue #436BAD ΔE 0.062
- Clear Blue #247AFD ΔE 0.065
Use #1F74D3 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.