#1273B3
Closest named color: Nice Blue (#107AB0). oklch(53.7% 0.129 245.1), rgb(18, 115, 179).
Aa
White text reads best on this color (5.08:1).
About this color
#1273B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.129 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.022 away. White text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.12:1 |
| White text | 5.08:1 |
Values
| HEX | #1273B3 |
| RGB | rgb(18, 115, 179) |
| HSL | hsl(204, 82%, 39%) |
| OKLCH | oklch(53.7% 0.129 245.1) |
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 #1273B3 | 5.08:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #1273B3 | 4.12:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #1273B3 text on white | 5.08:1 | AA | Lc 74.6 | Content text, not long reading |
| #1273B3 text on black | 4.12:1 | AA large text | Lc -27.1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A2C5E4
oklch(80.8% 0.058 245.3)
-
Step 400
400
#6EA7D7
oklch(70.8% 0.093 245)
-
Step 500
500
#4390CC
oklch(63.1% 0.118 244.9)
-
Step 600
600 (this color)
#1273B3
oklch(53.7% 0.129 245.1)
-
Step 700
700
#0A65A0
oklch(49% 0.121 245.5)
-
Step 800
800
#105381
oklch(42.7% 0.099 244.9)
-
Step 900
900
#174568
oklch(37.7% 0.078 245.2)
-
Step 950
950
#0F293D
oklch(27.1% 0.049 244.3)
#1273B3 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) | #5476B6 | 0.052 |
| Deuteranopia (no green cones) | #3D68B2 | 0.037 |
| Tritanopia (no blue cones) | #00838A | 0.091 |
| Achromatopsia (no color) | #6E6E6E | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1273B3
#1273B3
oklch(53.7% 0.129 245.1)
- #9C5C00
#9C5C00
oklch(53.6% 0.12 64.9)
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 #1273B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.022
- Mid Blue #276AB3 ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.029
- Windows Blue #3778BF ΔE 0.033
- French Blue #436BAD ΔE 0.035
- Muted Blue #3B719F ΔE 0.037
- Ocean Blue #03719C ΔE 0.037
- Sea Blue #047495 ΔE 0.050
Use #1273B3 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.