How much does Kastle cost?

No pricing page and no published rates; sold through a demo.

What are the best alternatives to Kastle?

Based on documented capability coverage across the Agentic Index 14 point taxonomy, the closest alternatives to Kastle among voice agents are Futwork, Liberate, Broccoli, Sameday. Each is graded on the same public evidence, and no vendor pays for placement.

Does Kastle support MCP and tool calling?

Partial under the Agentic Index verification standard. Kastle publishes some public evidence of tool calling and API or SDK extensibility, but narrower than full Model Context Protocol (MCP) support as defined by the Agentic Index taxonomy. Evidence basis: Beside chat, email, voice and SMS, custom surfaces connect through an API into Kastle's engine, but Kastle publishes no reference, endpoints, SDK or developer portal. Integrations connect the contact center, payment processor and loan manag. Graded from public evidence only against the Agentic Index 14 point capability taxonomy. No vendor pays for placement.

Does Kastle have SOC 2, SSO and role based access control?

Partial under the Agentic Index verification standard. Kastle publishes some public evidence of security and identity controls, but narrower than the full set of SOC 2, single sign on (SSO) and role based access control (RBAC). Evidence basis: Certification covers SOC 2 Type I and Type II, the company says it is GDPR ready, and a hosted trust center sits at trust.oneleet.com/kastle. Kastle names no SSO, roles or permissions for the lender's users. Kastle, kastle.ai, 2026-10-05. Graded from public evidence only against the Agentic Index 14 point capability taxonomy. No vendor pays for placement.

Does Kastle give you tracing and observability into agent runs?

Partial under the Agentic Index verification standard. Kastle publishes some public evidence of logging or observability, but narrower than full tracing and auditability across agent runs. Evidence basis: Real time monitoring with automated QA scorecards runs on every interaction, and Kastle says every AI response is fully explainable with reasoning built in. It names no view per call of the actions or transactions the agent carried out. QA. Graded from public evidence only against the Agentic Index 14 point capability taxonomy. No vendor pays for placement.

Back to vendors

Kastle

Q: Who is Kastle for?

mortgage servicers, independent mortgage banks, FDIC-insured banks, consumer lenders

Also known as: kastle.ai

Visit site

Voice agentindependentVerified 2026-09-28

Entry priceContact salesFull pricing detail

AI agents for loan operations across origination, fulfillment and servicing. A Loan Officer Assistant and Collections, Servicing, Compliance and Loss Mitigation agents work borrower calls, SMS, email and chat around the clock, complete approved transactions and escalate what exceeds their authority. Kastle is SOC 2 Type II certified and raised a $24M Series A led by Insight Partners.

Kastle sells AI agents for regulated lending work across origination, fulfillment and servicing. Five named agents cover the job. A Loan Officer Assistant issues pre approval letters, books appointments and transfers warm leads. A Collections Agent sends payment reminders and engages delinquent borrowers early. A Servicing Agent resolves borrower inquiries across voice, SMS, email and chat and completes approved transactions instead of queuing them.

A Compliance Agent and a Loss Mitigation Agent for modifications and alternatives complete the set. Kastle integrates with the lender's contact center, payment processor and loan management system, and an Agent Builder turns the lender's SOPs into agents in natural language that can be changed without code.

A compliance engine pre trained on FDCPA, TILA and UDAAP as well as RESPA and TCPA scores every interaction with automated QA scorecards, responses are explainable with in built reasoning, and simulation testing runs edge cases before production. Requests beyond an agent's authority, such as loan modifications, go to people. Kastle is SOC 2 Type II certified and publishes a trust center on Oneleet and a status page.

Kastle AI Inc. raised a $24M Series A led by Insight Partners, won LendingTree's 2024 Innovation Challenge and announced a servicing partnership with Carrington in July 2026. It reports 70 percent lower cost per call for customers, a vendor figure.

Vendor details

Canonical URL

https://www.kastle.ai

Funding status

$24M Series A led by Insight Partners (company site)

Company status

independent

Use cases & customers

Primary use cases

mortgage payment collection and escrow questionsearly-delinquency engagement and collections recoveryborrower verification and onboardingnew loan inquiry qualification24/7 branded borrower servicing

Target customers

mortgage servicersindependent mortgage banksFDIC-insured banksconsumer lenders

Deployment options

SaaS

Integrations

Integrates with the lender's contact center, payment processor and loan management system, none of them named. Agents work voice, SMS, email and chat, and custom surfaces connect through an API.

In practice

Borrowers reach out about their loans at all hours. The Servicing Agent answers across voice, SMS, email and chat around the clock and completes approved transactions instead of sending them to a queue.

Past due accounts are piling up. The Collections Agent sends payment reminders, reaches delinquent borrowers early and can offer to spread the past due amount across upcoming payments.

A borrower calls about a missed payment and asks for a loan modification. An agent built from your SOP in Agent Builder explains repayment plan options, collects the details and escalates the call to a person on your team.

Sources & related URLs

Research sources

https://www.kastle.ai/ https://www.fintechfutures.com/press-releases/haven-partners-with-kastle-to-streamline-the-mortgage-servicing-experience-with-ai-powered-voice-agents https://www.chrismancommentary.com/post/ai-agents-reshaping-mortgage-lending-servicing https://www.videosdk.live/ai-apps/kastle

Agentic Index coverage score

7.0 / 14 capabilities · 50%

Integrations & Tool Calling	Full
Kastle integrates with the lender's contact center, payment processor and loan management system, and its agents complete approved transactions instead of routing them to a queue, generate pre approval letters, book appointments and take payments. None of those systems is named. Setup takes days rather than months. SourceKastle, kastle.airead 2026-10-05
Workflow Orchestration	Full
An Agent Builder lets the lender turn its SOPs into agents in natural language and update them without code or professional services, and agents map to the lender's existing workflows, which the lender configures. Kastle names no branching, retries or hand offs between the five agents. SourceKastle, kastle.airead 2026-10-05
Knowledge Grounding & RAG	Not documented
SOPs become agent instructions through the Agent Builder, and the compliance engine is pre trained on FDCPA, TILA and UDAAP as well as RESPA and TCPA. Kastle names no knowledge base or retrieval over the lender's documents, and does not say what the agent reads from the loan management integration. SourceKastle, kastle.ai homepageread 2026-09-28
Human Oversight & Guardrails	Partial
Agents complete only approved transactions and hand requests beyond their authority, such as loan modifications, and warm leads to people, with a compliance engine constraining what they say. Kastle names no step where staff approve an agent action before it goes through. In the Agent Builder example, an agent for missed payment calls explains repayment plan options, collects the details and escalates to a person when the borrower asks for a loan modification. SourceKastle, kastle.airead 2026-10-05
Security, Identity & Governance	Partial
Certification covers SOC 2 Type I and Type II, the company says it is GDPR ready, and a hosted trust center sits at trust.oneleet.com/kastle. Kastle names no SSO, roles or permissions for the lender's users. SourceKastle, kastle.ai; trust.oneleet.com/kastleread 2026-10-05
Observability & Auditability	Partial
Real time monitoring with automated QA scorecards runs on every interaction, and Kastle says every AI response is fully explainable with reasoning built in. It names no view per call of the actions or transactions the agent carried out. QA covers 100% of interactions, whether an agent or a person handled them. SourceKastle, kastle.airead 2026-10-05
Memory & State Persistence	Not documented
Borrower and loan records stay in the lender's own loan management system, and Kastle names no memory the agents keep of borrowers or past conversations. SourceKastle, kastle.ai homepageread 2026-09-28
Deployment & Data Residency	Not documented
The service is hosted by Kastle, and lenders set it up in days. No hosting region or region choice is published, and no dedicated or customer hosted option is offered. Sourcerishichoudhary.com/kastleprivacypolicyread 2026-09-28
Prebuilt Agents, Templates & Packs	Full
Five named agents with separate jobs make up the product line. The Loan Officer Assistant handles pre approvals, appointments and warm transfers, alongside a Collections Agent, a Servicing Agent, a Compliance Agent and a Loss Mitigation Agent, and each works on its own. The Collections Agent automates payment reminders and engages delinquent borrowers early, and the Servicing Agent resolves inquiries across voice, SMS, email and chat and completes approved transactions instead of routing them to a queue. SourceKastle, kastle.airead 2026-10-05
Triggers & Channel Coverage	Full
Agents answer borrower contacts around the clock across voice, SMS, email and chat, and the Collections Agent sends payment reminders and reaches out early to delinquent borrowers without staff starting it. Kastle runs in production at 10 of the top 25 US servicers. SourceKastle, kastle.airead 2026-10-05
Model Flexibility & Routing	Not documented
The agents run on a proprietary compliance engine and one centralized AI engine across channels. Kastle names no model provider and offers no model choice. That compliance engine is pre trained on FDCPA, TILA, UDAAP, RESPA and TCPA. SourceKastle, kastle.airead 2026-10-05
APIs, SDKs & MCP Extensibility	Partial
Beside chat, email, voice and SMS, custom surfaces connect through an API into Kastle's engine, but Kastle publishes no reference, endpoints, SDK or developer portal. Integrations connect the contact center, payment processor and loan management system. SourceKastle, kastle.airead 2026-10-05
Testing, Debugging & Optimization	Full
Simulation testing runs AI generated edge cases against agents before they reach production, and automated QA scorecards score every live interaction for compliance. Kastle reports 100% QA coverage and a 99.5% compliance score, and claims 70% lower cost per call, 40% lower handle time and CSAT above 90%. SourceKastle, kastle.airead 2026-10-05
Browser & Computer Use	Not documented
Systems are reached through integrations with the contact center, payment processor and loan management system. Kastle names no browser, desktop or computer control. Custom surfaces connect through an API. SourceKastle, kastle.airead 2026-10-05

The Agentic Index coverage score grades every vendor Full, Partial or Not documented against the same 14 buyer facing capabilities, from public evidence only. Each capability links to how all vendors in the index score on it. How this evidence is graded

Pricing

Contact sales

enterprise contract

What is public

The motion only (demo led sales, setup in days, a vendor claim of 70 percent lower cost per call); no rates or metering are published.

Variable cost rationale

No billing model published; the cost per call framing is a vendor outcome claim, not a documented billing basis.

Sales call required

Yes, required for paid access

Free / trial

Not published

Agentic Index verified 2026-09-28

Official pricing page

Related vendors

Alternatives to Kastle

The closest documented capability profiles to Kastle among voice agents tracked by Agentic Index, ordered by similarity on the same 14 point evidence the rankings use. No vendor pays for placement.

Futwork7.5 / 14Adds documented Knowledge Grounding & RAG and Model Flexibility & Routing
Liberate7.5 / 14Adds documented Knowledge Grounding & RAG
Broccoli6.0 / 14Adds documented Model Flexibility & Routing
Sameday8.0 / 14Adds documented Knowledge Grounding & RAG and Memory & State Persistence
AviaryAI6.5 / 14Adds documented Knowledge Grounding & RAG
Avoca6.5 / 14Adds documented Knowledge Grounding & RAG

Similarity is computed from each vendor's Agentic Index coverage score evidence, axis by axis, not from the totals. How this evidence is graded

Compare Kastle with other vendors →Compare all voice agents →See where Kastle ranks →

Data confidence: medium

Head to head

Kastle vs Salient