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4.1/5.0
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Koltrix

AI-powered team inbox and transactional email API for SaaS teams.

Pricing

From$39.00/mo

Paid
Score

4.1/5

Certifications
1
Last technical review
2026-11-07
Available plansVisit website (opens in a new tab)

Technical Overview

Koltrix is an AI-first email platform for SaaS engineering teams. It combines a custom-domain shared inbox where AI sorts messages and drafts replies with a transactional email API and SMTP relay. Featuring a native MCP server for Claude and ChatGPT, it consolidates communication stacks into a single bill.

Analyst Evaluation: Pros and Limitations

Verified Advantages

  • Combines AI team inbox and transactional email infrastructure in one place.
  • Built-in Model Context Protocol (MCP) server for direct LLM integration.
  • Custom domain support with complete SPF, DKIM, and DMARC configuration.

Technical Considerations

  • Lacks a permanent free tier, offering only a 7-day trial.
  • Fully autonomous AI replies are in beta and require manual enablement.

Technical Capabilities & Features

4/7
Included:REST & GraphQL API
Not available:SSO / SAML Authentication
Not available:Self-Hosted Option
Included:Full Data Export
Included:Role-Based Access Control (RBAC)
Included:Custom Domains & SSL
Not available:Immutable Audit Logs
Scorecard
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Technical Scorecard: Koltrix

78/100
DX & Tech Documentation
Excellent
80/100
Pricing Fairness
Favorable
75/100
Security & Governance
Favorable
70/100
Data Portability & Sovereignty
Favorable
78/100
Performance & Reliability
Excellent
85/100

Time to Value & Fit by Segment: Koltrix

Estimated Time-to-Value< 1 hour (Immediate)

Near-instantaneous deployment with minimal technical friction.

Learning CurveModerate (Standard)

Requires consulting technical documentation and basic credentials setup.

Fit Index by Organization Size

Startup & Agile Teams1 to 50 members
9%
Mid-Market & Scaleup50 to 500 members
7%
Corporate Enterprise500+ members
4%
Pricing & TCO
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Pricing

$39.00/mo

Model: PAID.

Available plans:

  • Pro Mensual$39/mo
Get Koltrix (opens in a new tab)

Billing Risks & Hidden Clauses: Koltrix

Audited Billing Critical Points:
  • Prueba gratuita limitada a 7 días sin un plan permanente de nivel gratuito.
Total Cost of Ownership (TCO) Projection: Koltrix$39.00/mo
Deterministic cost estimation at 12 and 36 months based on team size, including SSO tax premiums and annual prepay discounts.
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Indie / Solo (1 active user)

Solo developer or independent technical founder.

Base Monthly Cost
$39/month
1 active user
12-Month Investment
$398/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$1,194total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 1 active user

Calculated infrastructure: VPS 1 vCPU / 2GB RAM (~$5) + 0.5h DevOps/mes ($20)

Annual VPS + DevOps Cost$300/year
Differential vs SaaS LicensingSavings of $98/year
Startup (10 active users)

Agile engineering team in validation and early traction stage.

Base Monthly Cost
$390/month
10 active users
12-Month Investment
$3,978/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$11,934total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 3 active users

Calculated infrastructure: VPS 2 vCPU / 8GB RAM (~$15) + 2h DevOps/mes ($80)

Annual VPS + DevOps Cost$1,140/year
Differential vs SaaS LicensingSavings of $2,838/year
Growth (25 active users)

Scaling company with team governance and granular access control requirements.

Base Monthly Cost
$975/month
25 active users
12-Month Investment
$9,945/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$29,835total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 9 active users

Calculated infrastructure: Cluster VPS 4 vCPU / 16GB RAM (~$45) + 6h DevOps/mes ($240)

Annual VPS + DevOps Cost$3,420/year
Differential vs SaaS LicensingSavings of $6,525/year
Scaleup (100 active users)

Established organization with enterprise security policies and mandatory SAML/SSO.

Base Monthly Cost
$3,900/month
100 active users
12-Month Investment
$39,780/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$119,340total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 24 active users

Calculated infrastructure: Infraestructura HA redundante + Backups (~$150) + 16h DevOps/mes ($640)

Annual VPS + DevOps Cost$9,480/year
Differential vs SaaS LicensingSavings of $30,300/year
Usage Surcharges & Bill Shock Simulator: KoltrixWhat usage costs as you scale
Detect overage penalties before they impact engineering budget.
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Prototype / MVP (10 GB)

Included base quota in plan: 20 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$39/mo
Fixed subscription or contracted tier
Overage Penalty
$0/month extra
Usage covered within plan quota
Estimated Monthly Invoice
$39/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Suitable for development; verify concurrent connection limits.

Base Production (50 GB)

Included base quota in plan: 20 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$39/mo
Fixed subscription or contracted tier
Overage Penalty
+$5/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$44/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Implement table compression policies and temporal partitioning.

Active Growth (250 GB)

Included base quota in plan: 20 GB.
Moderate Risk / Monitor Quota
Base Monthly Rate
$39/mo
Fixed subscription or contracted tier
Overage Penalty
+$41/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$80/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Offload cold backups to standard object storage (S3).

Large Scale (1.000 GB (1 TB))

Included base quota in plan: 20 GB.
Critical Risk / Severe Bill Shock
Base Monthly Rate
$39/mo
Fixed subscription or contracted tier
Overage Penalty
+$176/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$215/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Migrate to dedicated instance or self-hosted cluster to curtail I/O fees.

Procurement Strategy & Discounts: KoltrixB2B Negotiation Playbook
Corporate executive level with highest authority to approve budgetary exceptions.
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Fair Market Price & B2B Procurement Benchmark

Non-renewal notice: 30 days before expirationMedian achieved discount: -12%
Public List Price
$39 /mo
100% baseline
Audited Market Average
$34 /mo
~88% of list price
Optimized Target Price
$31 /mo
Max achievable discount (Q4 / multi-year): -20%

Verified Tactical Savings Levers

  • Annual Upfront PrepayUp to -15%

    Consolidated discount for upfront annual billing versus monthly rate.

Security & Data Exit
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Compliance & Security Standards: Koltrix

SOC 2 Type IINot reported
ISO 27001Not reported
GDPR / RGPDAudited
HIPAANot reported
PCI-DSSNot reported
Jurisdiction & Legal Sovereignty
🇺🇸United States [US]Subject to US CLOUD ActGDPR DPA Available
SSO Availability (SAML Enterprise)
No SSO Documented
Data Residency
USEUAWS
AI Privacy Policy
Opt-out available
Data Liberation & Migration Runbook: KoltrixJSON · EML · CSV
Actionable escape runbook and credential export guarantees to mitigate vendor lock-in.
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Supported Structured Export Formats
JSONEMLCSV
Password Hash Portability
Subject to Support Ticket (Manual Process)

Credential hash export requires commercial mediation or formal support ticket approval.

CLI Command / Rescue Endpoint
GET /api/v1/export
Exit Protocol & Migration Notes

Exportación de datos de correo mediante protocolos estándares IMAP y llamadas a API.

Deployment & Infrastructure Requirements: KoltrixDocker
Hardware specs and Docker directives to run on local servers, dedicated VPS, or Kubernetes without telemetry leak to the cloud.
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Minimum Memory1 GB RAM (Recommended)
Compute CPU1 vCPU
Runtime / LanguageTypeScript / Go / Rust
Code LicenseOpen Source
Docker CLI Directive
docker run -d --name koltrix -p 8080:8080 koltrix:latest
Companion Services & Dependencies:
PostgreSQL 15+Redis 7+
Community & Repository
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Technical Reputation of Koltrix

73/100 Technical Trust

Frequent Praises in Production

  • Combines AI team inbox and transactional email infrastructure in one place.
  • Built-in Model Context Protocol (MCP) server for direct LLM integration.
  • Custom domain support with complete SPF, DKIM, and DMARC configuration.

Reported Production Frictions

  • Lacks a permanent free tier, offering only a 7-day trial.
  • Fully autonomous AI replies are in beta and require manual enablement.
Commercial Treatment & Vendor Lock-in:Self-Service in Dashboard

Cancellation flow is autonomous via billing portal or subscription settings.

Frequently Asked Technical Questions (Koltrix)

How long does custom domain setup take?

Setting up your domain with SPF, DKIM, and DMARC records typically takes around ten minutes using the onboarding assistant.

Can AI agents send emails automatically?

By default, human approval is required before sending any agent-drafted reply. Fully autonomous replies are an opt-in beta feature.

Is a transactional email API included?

Yes, the platform includes a developer email API and SMTP relay alongside the shared inbox to handle product-generated notifications.

Head-to-Head Comparisons

Direct Alternatives

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