#137DF3
Closest named color: Clear Blue (#247AFD). oklch(60.2% 0.198 256.1), rgb(19, 125, 243).
Aa
Black text reads best on this color (5.25:1).
About this color
#137DF3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.198 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.018 away. Black text reads best on it, at 5.25:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.25:1 |
| White text | 3.99:1 |
Values
| HEX | #137DF3 |
| RGB | rgb(19, 125, 243) |
| HSL | hsl(212, 90%, 51%) |
| OKLCH | oklch(60.2% 0.198 256.1) |
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 #137DF3 | 3.99:1 | AA large text | Lc -72.0 | Content text, not long reading |
| Black text on #137DF3 | 5.25:1 | AA | Lc 37.5 | Non-text elements, placeholder text |
| #137DF3 text on white | 3.99:1 | AA large text | Lc 66.5 | Content text, not long reading |
| #137DF3 text on black | 5.25:1 | AA | Lc -35.1 | 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 500.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFD
oklch(88.5% 0.054 257.1)
-
Step 300
300
#97C3FF
oklch(80.8% 0.098 256.3)
-
Step 400
400
#5BA2FF
oklch(70.8% 0.155 255.9)
-
Step 500
500 (this color)
#137DF3
oklch(60.2% 0.198 256.1)
-
Step 600
600
#006FDF
oklch(55.6% 0.191 256.1)
-
Step 700
700
#005DBD
oklch(49.1% 0.169 256.1)
-
Step 800
800
#004C9C
oklch(42.7% 0.146 256)
-
Step 900
900
#003F84
oklch(37.7% 0.129 256.1)
-
Step 950
950
#06264D
oklch(27.1% 0.081 255.8)
#137DF3 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) | #3389F7 | 0.037 |
| Deuteranopia (no green cones) | #0076F1 | 0.019 |
| Tritanopia (no blue cones) | #009AAC | 0.149 |
| Achromatopsia (no color) | #7F7F7F | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #137DF3
#137DF3
oklch(60.2% 0.198 256.1)
- #AB7400
#AB7400
oklch(60.1% 0.126 75.9)
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 #137DF3, closest first.
No curated palette has a color within ΔE 0.04 of #137DF3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.018
- Cerulean Blue #056EEE ΔE 0.039
- Dodger Blue #1E90FF ΔE 0.052
- Royal Blue #4169E1 ΔE 0.055
- Bright Blue #0165FC ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.063
- Neon Blue #4361EE ΔE 0.067
- Cornflower #6A79F7 ΔE 0.068
Use #137DF3 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.