Lex vs River AI
Which Productivity AI tool is better in 2026?
Lex
Collaborative documents with powerful AI editing tools to help you write something great today.
River AI
On-brand content, without the prompting, for teams.
Side-by-side
River AI is the more established option (raised $1.1B), but Lex is cheaper to start.
| Metric | Lex | River AI |
|---|---|---|
| Taglinei | Collaborative documents with powerful AI editing tools to help you write something great today. | On-brand content, without the prompting, for teams. |
| Foundedi | — | — |
| HQi | — | — |
| Employeesi | 1-10 | 1-10🏆 |
| Neuron scorei | 22🏆 | 0 |
| Total fundingi | Undisclosed | $1.1B🏆 |
| Latest roundi | — | series-a · Aug 2026 |
| Valuationi | — | — |
| Cheapest paid plani | From $14.99/mo🏆 | Starter · $29/mo |
| Free plani | ✗ | ✗ |
| Free triali | ✗ | ✓ |
| Top tier pricei | Pricing not disclosed | Growth · $99/mo |
| Pricing summaryi | Freemium · From $14.99/mo | 3 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Lex and River AI.
| Capability | Lex | River AI |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Lex
- Higher Neuron score (22 vs 0)
- Lower starting price ($14.99/mo)
🔵 Strengths of River AI
- Has raised more capital ($1.1B vs Undisclosed)
- Offers a free trial
Which should you choose?
Choose Lex if price matters most — it starts at Freemium · From $14.99/mo, which is friendlier for teams watching burn. Both AI Productivity tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose River AI if you want the most established option — it has raised $1.1B, 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
Lex vs River AI — which is better?
It depends on your priority. Lex is the leaner option; River AI has broader feature depth. See the side-by-side table above.
Is Lex cheaper than River AI?
Yes — Lex's cheapest paid plan is Freemium · From $14.99/mo, while River AI's is Starter · $29/mo.
Do Lex and River AI offer free plans?
Lex: Paid only. River AI: Free trial only.
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