Blumira
8.1/10
MSP Compared score
- Starting price
- Free tier available
- Reviews
- 4.6/5 (~120 G2 reviews)
- Free trial
- Free tier + 14 days
- Deployment
- Cloud
- Best for
- Lean IT teams wanting easy SIEM + detection with a free tier
Best SIEM Software · 2026
Blumira vs 
UnderDefense Blumira vs UnderDefense: on our data-weighted scoring, Blumira edges ahead (8.1 vs 8.1/10). Blumira starts at Free tier available and is best for lean IT teams wanting easy SIEM + detection with a free tier; UnderDefense starts at $11/endpoint/mo and is best for teams that want an agentic AI SOC on top of the SIEM or XDR they already run. Choose Blumira for the stronger overall track record; consider UnderDefense if its pricing model or fit matches your environment better. Side-by-side table below.
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UnderDefense
8.1/10
MSP Compared score
- Starting price
- $11/endpoint/mo
- Reviews
- 4.9/5 (~29 G2 reviews)
- Free trial
- 14 days
- Deployment
- Cloud + on-prem
- Best for
- Teams that want an agentic AI SOC on top of the SIEM or XDR they already run
Strengths at a glance
Six criteria, each scored 0–10 on the same scale from real review data, public pricing and feature coverage. See our methodology →
| Criterion | Blumira | UnderDefense |
|---|---|---|
| Editorial | 8.1 | 8.1 |
| User reviews | 9.2 | 9.8 |
| Adoption | 5.5 | 3.9 |
| Affordability | 9.5 | 4.1 |
| Feature breadth | 5.0 | 6.0 |
| Ease of trial | 10.0 | 6.0 |
Blumira vs UnderDefense: head-to-head
| Blumira | UnderDefense | |
|---|---|---|
| Starting price | Free tier available | $11/endpoint/mo |
| Pricing model | per user | per endpoint |
| Free trial / tier | Free tier + 14 days | 14 days |
| Best for | Lean IT teams wanting easy SIEM + detection with a free tier | Teams that want an agentic AI SOC on top of the SIEM or XDR they already run |
| Deployment | Cloud | Cloud + on-prem |
| G2 rating | 4.6/5 (120) | 4.9/5 (29) |
| Capterra rating | — | — |
| Our score | 8.1 | 8.1 |
Choose Blumira if…
You need lean it teams wanting easy siem + detection with a free tier.
✓ Pros
- Genuinely easy SIEM
- Free M365 tier
- Fast deployment
✕ Cons
- Lighter than enterprise SIEM
- Paid tiers quote-based
- Smaller integration set
Choose UnderDefense if…
You need teams that want an agentic ai soc on top of the siem or xdr they already run.
✓ Pros
- Published per-endpoint floor (rare in this category)
- Runs on the SIEM/XDR you already own
- 14-day trial
✕ Cons
- G2 volume still small vs Huntress or Arctic Wolf
- Higher tiers are contact-sales
- Annual contracts
In depth
Pricing
| Aspect | Blumira | UnderDefense |
|---|---|---|
| Model | Per-user | Per-endpoint |
| Free Tier | Yes (Microsoft 365 + 3 cloud connectors) | No |
| Trial | 14 days | 14 days |
| Starting Price | Quote-based (paid tiers) | $11/endpoint/month |
| Billing | Annual | Annual |
| Transparency | Limited—paid plans not published | Moderate—floor published, higher tiers contact-sales |
Verdict: Blumira wins on cost of entry with a perpetual free SIEM tier. UnderDefense is more transparent about its baseline ($11/endpoint) but requires negotiation above Standard tier, making total cost-of-ownership harder to forecast upfront.
Features & Deployment
Blumira
- Deployment: Cloud-only
- Core offerings: Cloud SIEM, automated detections + playbooks, 24/7 SecOps support, honeypots, easy setup
- Positioning: Standalone SIEM for lean teams
UnderDefense
- Deployment: Cloud + on-prem
- Core offerings: Agentic AI SOC overlay, vendor-agnostic SIEM/XDR connectors, 24/7 concierge analysts, co-managed SIEM, ChatOps (Slack/Teams), incident response retainer
- Positioning: Sits on top of your existing SIEM/XDR; replaces manual SOC triage
Verdict: Blumira is a complete SIEM replacement; UnderDefense is a managed SOC layer. Choose Blumira if you have no SIEM yet and want simplicity. Choose UnderDefense if you already own a SIEM/XDR and want AI-driven triage + managed response without rip-and-replace.
Ratings & Our Score
| Platform | G2 Score | Review Count |
|---|---|---|
| Blumira | 4.6★ | 120 |
| UnderDefense | 4.9★ | 29 |
Both score 8.1 in our assessment. UnderDefense edges G2 sentiment (likely due to smaller, more engaged cohort), but Blumira’s 120 reviews reflect broader adoption. UnderDefense’s review volume remains light—a caution flag for those weighing peer validation.
Verdict
Choose Blumira if you’re a small-to-midmarket team, want a turnkey SIEM with no vendor lock-in cost, and can live with lighter detection logic. The free tier and 14-day trial make it a near-zero friction entry point.
Choose UnderDefense if you already run a Splunk, Elastic, CrowdStrike, or similar platform and want AI-driven incident triage + managed response without replacing your stack. The published $11/endpoint floor and multi-layer deployment model suit larger orgs with existing infrastructure investments.
Frequently asked questions
- Blumira vs UnderDefense: which is better?
- Blumira vs UnderDefense: on our data-weighted scoring, Blumira edges ahead (8.1 vs 8.1/10). Blumira starts at Free tier available and is best for lean IT teams wanting easy SIEM + detection with a free tier; UnderDefense starts at $11/endpoint/mo and is best for teams that want an agentic AI SOC on top of the SIEM or XDR they already run.
- Is Blumira cheaper than UnderDefense?
- Blumira starts at Free tier available and UnderDefense starts at $11/endpoint/mo (see the pricing rows for models and limits).
Data as of September 17, 2026. Sources: blumira.com, underdefense.com. Figures are pulled from public vendor and security data and refreshed automatically.