#010FCC
Named color: True Blue. oklch(38.9% 0.26 264.3), rgb(1, 15, 204).
Aa
White text reads best on this color (10.81:1).
About this color
#010FCC is a dark, vivid blue. In OKLCH its lightness is 39%, its chroma 0.260 and its hue 264°. Its hue sits on the cool side of the wheel. It is the named color True Blue. White text reads best on it, at 10.81:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | vivid (0.260) |
| Temperature | cool |
| Nearest name | True Blue |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #010FCC |
| RGB | rgb(1, 15, 204) |
| HSL | hsl(236, 99%, 40%) |
| OKLCH | oklch(38.9% 0.26 264.3) |
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 #010FCC | 10.81:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #010FCC | 1.94:1 | Fails | Lc 11.6 | Not readable |
| #010FCC text on white | 10.81:1 | AAA | Lc 92.3 | Preferred for body text |
| #010FCC text on black | 1.94:1 | Fails | Lc -10.1 | Not readable |
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 900.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600
#255FFF
oklch(55.6% 0.244 264.3)
-
Step 700
700
#0438FF
oklch(49.1% 0.287 264.3)
-
Step 800
800
#0300EC
oklch(42.7% 0.295 264.3)
-
Step 900
900 (this color)
#010FCC
oklch(38.9% 0.26 264.3)
-
Step 950
950
#001075
oklch(27.1% 0.165 264.2)
#010FCC 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) | #0047D1 | 0.085 |
| Deuteranopia (no green cones) | #0032C9 | 0.042 |
| Tritanopia (no blue cones) | #005678 | 0.192 |
| Achromatopsia (no color) | #3D3D3D | 0.261 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #010FCC
#010FCC
oklch(38.9% 0.26 264.3)
- #594000
#594000
oklch(38.9% 0.08 83.4)
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 #010FCC, closest first.
No curated palette has a color within ΔE 0.04 of #010FCC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Blue #0000CD ΔE 0.008
- Ultramarine Blue #1805DB ΔE 0.028
- Pure Blue #0203E2 ΔE 0.035
- Ultramarine #2000B1 ΔE 0.053
- Cobalt Blue #030AA7 ΔE 0.065
- Strong Blue #0C06F7 ΔE 0.071
- Primary Blue #0804F9 ΔE 0.073
- Rich Blue #021BF9 ΔE 0.078
Use #010FCC 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.