#1F51B4
Closest named color: Blue Blue (#2242C7). oklch(46.3% 0.167 262), rgb(31, 81, 180).
Aa
White text reads best on this color (7.25:1).
About this color
#1F51B4 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.167 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.046 away. White text reads best on it, at 7.25:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.89:1 |
| White text | 7.25:1 |
Values
| HEX | #1F51B4 |
| RGB | rgb(31, 81, 180) |
| HSL | hsl(220, 71%, 41%) |
| OKLCH | oklch(46.3% 0.167 262) |
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 #1F51B4 | 7.25:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #1F51B4 | 2.89:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #1F51B4 text on white | 7.25:1 | AAA | Lc 84.6 | Fine for body text |
| #1F51B4 text on black | 2.89:1 | Fails | Lc -17.4 | 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
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A4C1F5
oklch(80.8% 0.081 261.9)
-
Step 400
400
#749FF1
oklch(70.6% 0.13 262.5)
-
Step 500
500
#5085EC
oklch(63.1% 0.165 262.2)
-
Step 600
600
#346CDA
oklch(55.6% 0.179 262.1)
-
Step 700
700 (this color)
#1F51B4
oklch(46.3% 0.167 262)
-
Step 800
800
#214A99
oklch(42.7% 0.138 261.8)
-
Step 900
900
#203F7A
oklch(37.8% 0.107 261.8)
-
Step 950
950
#132547
oklch(26.9% 0.068 261.9)
#1F51B4 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) | #005EB7 | 0.033 |
| Deuteranopia (no green cones) | #0050B2 | 0.015 |
| Tritanopia (no blue cones) | #006A7A | 0.130 |
| Achromatopsia (no color) | #575757 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F51B4
#1F51B4
oklch(46.3% 0.167 262)
- #735300
#735300
oklch(46.4% 0.095 82.7)
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 #1F51B4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.046
- Sapphire #2138AB ΔE 0.061
- Cobalt #1E488F ΔE 0.063
- Dusk Blue #26538D ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.068
- Blueberry #464196 ΔE 0.069
- Mid Blue #276AB3 ΔE 0.070
- Denim Blue #3B5B92 ΔE 0.070
Use #1F51B4 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.