#1B7AE3
Closest named color: Cerulean Blue (#056EEE). oklch(58.5% 0.18 255.2), rgb(27, 122, 227).
Aa
Black text reads best on this color (4.93:1).
About this color
#1B7AE3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.180 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.038 away. Black text reads best on it, at 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #1B7AE3 |
| RGB | rgb(27, 122, 227) |
| HSL | hsl(212, 79%, 50%) |
| OKLCH | oklch(58.5% 0.18 255.2) |
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 #1B7AE3 | 4.25:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #1B7AE3 | 4.93:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #1B7AE3 text on white | 4.25:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #1B7AE3 text on black | 4.93:1 | AA | Lc -32.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9EC4F5
oklch(81% 0.081 255)
-
Step 400
400
#67A3F0
oklch(70.7% 0.13 255.3)
-
Step 500
500
#3989EB
oklch(63% 0.167 255.4)
-
Step 600
600 (this color)
#1B7AE3
oklch(58.5% 0.18 255.2)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800
#044D98
oklch(42.7% 0.138 255.2)
-
Step 900
900
#114179
oklch(37.7% 0.108 255.2)
-
Step 950
950
#0C2747
oklch(27.1% 0.068 254.6)
#1B7AE3 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) | #3F84E7 | 0.038 |
| Deuteranopia (no green cones) | #0073E1 | 0.021 |
| Tritanopia (no blue cones) | #0093A3 | 0.135 |
| Achromatopsia (no color) | #7B7B7B | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B7AE3
#1B7AE3
oklch(58.5% 0.18 255.2)
- #A66F00
#A66F00
oklch(58.5% 0.124 74.7)
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 #1B7AE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.038
- Clear Blue #247AFD ΔE 0.040
- Royal Blue #4169E1 ΔE 0.045
- Water Blue #0E87CC ΔE 0.054
- Windows Blue #3778BF ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.063
- Neon Blue #4361EE ΔE 0.065
- Bright Blue #0165FC ΔE 0.067
Use #1B7AE3 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.