#1978B5
Closest named color: Nice Blue (#107AB0). oklch(55.1% 0.126 243.6), rgb(25, 120, 181).
Aa
White text reads best on this color (4.77:1).
About this color
#1978B5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.126 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.011 away. White text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.39:1 |
| White text | 4.77:1 |
Values
| HEX | #1978B5 |
| RGB | rgb(25, 120, 181) |
| HSL | hsl(203, 76%, 40%) |
| OKLCH | oklch(55.1% 0.126 243.6) |
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 #1978B5 | 4.77:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #1978B5 | 4.39:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #1978B5 text on white | 4.77:1 | AA | Lc 72.7 | Content text, not long reading |
| #1978B5 text on black | 4.39:1 | AA large text | Lc -29.0 | 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
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A2C5E3
oklch(80.8% 0.057 244.4)
-
Step 400
400
#6EA7D5
oklch(70.7% 0.09 243.9)
-
Step 500
500
#4390CA
oklch(63% 0.116 244)
-
Step 600
600 (this color)
#1978B5
oklch(55.1% 0.126 243.6)
-
Step 700
700
#09669D
oklch(49.1% 0.116 243.5)
-
Step 800
800
#0F537F
oklch(42.6% 0.097 243.6)
-
Step 900
900
#174566
oklch(37.6% 0.075 243.7)
-
Step 950
950
#0F293C
oklch(27.1% 0.048 243)
#1978B5 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) | #5B7AB8 | 0.055 |
| Deuteranopia (no green cones) | #456CB4 | 0.041 |
| Tritanopia (no blue cones) | #00878E | 0.086 |
| Achromatopsia (no color) | #727272 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1978B5
#1978B5
oklch(55.1% 0.126 243.6)
- #A35F00
#A35F00
oklch(55.1% 0.125 63.9)
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 #1978B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.011
- Windows Blue #3778BF ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.028
- Muted Blue #3B719F ΔE 0.038
- Mid Blue #276AB3 ΔE 0.039
- French Blue #436BAD ΔE 0.042
- Ocean Blue #03719C ΔE 0.043
- Steel Blue #4682B4 ΔE 0.046
Use #1978B5 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.