#1F7CBB
Closest named color: Nice Blue (#107AB0). oklch(56.5% 0.128 244.3), rgb(31, 124, 187).
Aa
Black text reads best on this color (4.65:1).
About this color
#1F7CBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.128 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.019 away. Black text reads best on it, at 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.65:1 |
| White text | 4.50:1 |
Values
| HEX | #1F7CBB |
| RGB | rgb(31, 124, 187) |
| HSL | hsl(204, 72%, 43%) |
| OKLCH | oklch(56.5% 0.128 244.3) |
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 #1F7CBB | 4.50:1 | AA | Lc -76.3 | Fine for body text |
| Black text on #1F7CBB | 4.65:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #1F7CBB text on white | 4.50:1 | AA | Lc 70.9 | Content text, not long reading |
| #1F7CBB text on black | 4.65:1 | AA | Lc -30.8 | Non-text elements, placeholder text |
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
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A2C5E4
oklch(80.8% 0.058 245.3)
-
Step 400
400
#6DA7D6
oklch(70.7% 0.092 244.1)
-
Step 500
500
#4290CB
oklch(63.1% 0.117 244.2)
-
Step 600
600 (this color)
#1F7CBB
oklch(56.5% 0.128 244.3)
-
Step 700
700
#08669F
oklch(49.2% 0.119 244.3)
-
Step 800
800
#0F5380
oklch(42.6% 0.098 244.2)
-
Step 900
900
#174567
oklch(37.7% 0.076 244.4)
-
Step 950
950
#0F293C
oklch(27.1% 0.048 243)
#1F7CBB 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) | #5E7EBE | 0.055 |
| Deuteranopia (no green cones) | #4870BA | 0.041 |
| Tritanopia (no blue cones) | #008B93 | 0.087 |
| Achromatopsia (no color) | #777777 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F7CBB
#1F7CBB
oklch(56.5% 0.128 244.3)
- #A86300
#A86300
oklch(56.5% 0.127 64.6)
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 #1F7CBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.019
- Windows Blue #3778BF ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.036
- Water Blue #0E87CC ΔE 0.036
- Steel Blue #4682B4 ΔE 0.036
- Cool Blue #4984B8 ΔE 0.041
- Blue NCS #118AB2 ΔE 0.046
- Muted Blue #3B719F ΔE 0.048
Use #1F7CBB 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.