Alter vs Semgrep
Which for Cyber Defense AI tool is better in 2026?
Alter
Secure access control and authorization platform for agent workflows
Semgrep
Autonomous code security and static analysis for developers
Side-by-side
Semgrep is the more established option (raised $204M); pricing is comparable on both sides.
| Metric | Alter | Semgrep |
|---|---|---|
| Taglinei | Secure access control and authorization platform for agent workflows | Autonomous code security and static analysis for developers |
| Foundedi | 2025 | 2017🏆 |
| HQi | New York, US | San Francisco, United States |
| Employeesi | 1-10🏆 | — |
| Neuron scorei | 50 | 75🏆 |
| Total fundingi | $500K | $204M🏆 |
| Latest roundi | Seed · Jan 2025 | Series D · Feb 2025 |
| Valuationi | — | — |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✗ | ✓ |
| Free triali | ✗ | ✓ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Pricing not listed | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Alter and Semgrep.
| Capability | Alter | Semgrep |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✓ |
| OAuth 2.0 | ✗ | ✓ |
| SDK languages | — | 1 (Python) |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Alter
- Newer company (2025)
🔵 Strengths of Semgrep
- Has raised more capital ($204M vs $500K)
- Higher Neuron score (75 vs 50)
- Offers a free plan
- Offers a free trial
Which should you choose?
Choose Semgrep if price matters most — it starts at Free, which is friendlier for teams watching burn. Both AI for Cyber Defense tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Semgrep if you want the most established option — it has raised $204M, 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
Alter vs Semgrep — which is better?
It depends on your priority. Alter is the leaner option; Semgrep has broader feature depth. See the side-by-side table above.
Is Alter cheaper than Semgrep?
No — Semgrep's cheapest paid plan is Free, while Alter's is Pricing not listed.
Do Alter and Semgrep offer free plans?
Alter: Paid only. Semgrep: Yes, has a free plan.
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