Builder.io vs Spline
Which Design AI tool is better in 2026?
Builder.io
Visual AI platform: design-to-code, AI app building and an agentic CMS
Spline
Design and collaborate in 3D directly in your browser with real-time capabilities.
Side-by-side
Builder.io is the more established option (raised $62M), but Spline is cheaper to start.
| Metric | Builder.io | Spline |
|---|---|---|
| Taglinei | Visual AI platform: design-to-code, AI app building and an agentic CMS | Design and collaborate in 3D directly in your browser with real-time capabilities. |
| Foundedi | 2018🏆 | — |
| HQi | San Francisco, United States | — |
| Employeesi | — | — |
| Neuron scorei | 72🏆 | 18 |
| Total fundingi | $62M🏆 | Undisclosed |
| Latest roundi | Series B | — |
| Valuationi | — | — |
| Cheapest paid plani | Pricing not disclosed | Super · $7/mo🏆 |
| Free plani | ✓ | ✓ Starter |
| Free triali | ✓ | ✗ |
| Top tier pricei | Pricing not disclosed | Team · $15/mo |
| Pricing summaryi | Free | 3 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Builder.io and Spline.
| Capability | Builder.io | Spline |
|---|---|---|
| MCP support | ✓ | ✗ |
| Public API | ✓ | ✗ |
| Webhooks | ✓ | ✗ |
| OAuth 2.0 | ✓ | ✗ |
| SDK languages | 5 (JavaScript/TypeScript, React, Vue, Angular…) | — |
| Free plan | ✓ | ✓ |
| Free trial | ✓ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Builder.io
- Has raised more capital ($62M vs Undisclosed)
- Higher Neuron score (72 vs 18)
- Offers a free trial
- Newer company (2018)
🔵 Strengths of Spline
- Lower starting price ($7/mo)
Which should you choose?
Choose Spline if price matters most — it starts at Free · From $7/mo, which is friendlier for teams watching burn. Both AI Design tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Builder.io if you want the most established option — it has raised $62M, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
Builder.io vs Spline — which is better?
It depends on your priority. Builder.io has raised more capital and is the more established option; Spline is cheaper to start. See the side-by-side table above.
Is Builder.io cheaper than Spline?
No — Spline's cheapest paid plan is Super · $7/mo, while Builder.io's is Free.
Do Builder.io and Spline offer free plans?
Builder.io: Yes, has a free plan. Spline: Yes, has a free plan.
Explore more AI Design tools
Contextual paths to related AI startups, deals and rankings.