OnCallClerk
OnCallClerk is an AI receptionist platform that answers business calls 24/7, holds natural conversations, books appointments and captures leads. Setup runs through a no-code wizard in minutes, with a free plan and paid tiers from $29 monthly.
What is OnCallClerk?
OnCallClerk is an AI phone agent platform that answers a business's incoming calls in place of a human receptionist. When someone dials the number, the agent picks up instantly, holds a natural spoken conversation, answers questions about the business, captures the caller's details, books appointments and returns a full transcript with a one-line summary. The vendor aims it at service businesses that lose revenue to unanswered calls but cannot justify a full-time front desk.
Configuration runs through a guided wizard rather than a prompt editor. You pick your trade from a list of eighteen-plus industries — plumbing, HVAC, dentistry, law, property management, auto repair, veterinary and others — which pre-fills pricing, vocabulary, urgency rules and stock answers. You then choose a voice from more than thirty, set the greeting, opening hours, escalation policy and forwarding number, and claim a local or toll-free number, or forward the line you already publish. The vendor says the whole sequence takes under ten minutes and requires no code.
In operation the agent handles hundreds of simultaneous calls, so nobody hears hold music. It triages urgency using trade-specific rules, screens out spam and cold sales calls, transfers genuine callers to the right person with an optional briefing, and checks real calendar availability mid-conversation before confirming a slot. It works in English and Spanish and detects which one the caller is using.
There is a second product underneath the first. Every dashboard capability is exposed through a documented REST API, with a TypeScript SDK, signed webhooks on call.completed, lead.captured and booking.created, and a white-label mode letting agencies manage client numbers from one console. Native integrations cover Google Calendar, Calendly, HubSpot and Google Sheets, with webhook paths into ServiceTitan, Jobber and Housecall Pro, plus Zapier, Make and n8n.
The economic argument the site makes is blunt: a full-time receptionist costs roughly $3,500 a month for forty hours a week, against a free tier and paid plans from $29 a month for round-the-clock coverage. There is no mobile app — everything happens in the web dashboard or through the API.
What it does
- Answer every incoming call instantly, 24 hours a day, including nights, weekends and public holidays
- Book appointments by checking real calendar availability while the caller is still on the line
- Qualify inbound leads against configurable criteria and push the captured data into your CRM
- Transcribe every call in full and produce a one-line summary alongside it
- Screen out spam and cold sales calls, routing only genuine customers through to a human
- Transfer callers to the right person or department, with an optional briefing before the handoff
- Escalate urgent calls using industry-specific rules and send instant alerts
When to use OnCallClerk / When not to
A quick filter to help you decide if OnCallClerk is the right fit.
When to use OnCallClerk
- Owner-operators and small trade businesses — plumbing, HVAC, electrical, roofing, cleaning, pest control, locksmithing — whose revenue depends on picking up after hours
- Small practices with heavy inbound call volume and no dedicated front desk: dentists, veterinary clinics, law firms and accounting practices
- Property managers and real estate agents fielding emergency maintenance calls, viewing requests and applicant enquiries outside office hours
- Businesses needing weekend, overflow or out-of-hours cover without hiring a second person or paying a traditional answering service
- Agencies and developers who want to embed or resell voice agents, using the REST API, the TypeScript SDK and the white-label console
When not to use OnCallClerk
- Anyone who needs a mobile app: there is no iOS or Android client, and everything runs from the web dashboard or the API
- Businesses outside the United States that need a local number, since number provisioning is only documented for US area codes and toll-free lines
- Teams whose callers speak languages other than English or Spanish, the only two documented out of the box
- Procurement-driven buyers who require a signed DPA with a published subprocessor list, an audit report and a verifiable registered address
- Organisations wanting outbound calling or campaign dialling, since the product is presented purely as an inbound answering service
How to use OnCallClerk
A typical end-to-end flow, from setup to results.
- Create an account on the sign-up page; no payment card is requested
- Pick your industry in the wizard — accounting, auto repair, dentist, electrician, HVAC, law firm, plumbing, roofing, salon and others — which pre-fills pricing and stock answers
- Choose a voice from more than thirty and preview it in one click
- Write the greeting and tell the agent about your services, hours and how you want it to sound
- Set opening hours, escalation policy and the number calls should be forwarded to
- Claim a local number by filtering on area code, take a toll-free line, or forward the number you already publish
- Switch the agent on — there is no deployment step and no approval queue; it starts answering immediately
- Connect Google Calendar or Calendly so the agent can check availability and book during the call
- Drop a webhook URL, point a Google Sheet at the agent, or connect HubSpot so captured leads land where your team works
- Developers only: generate an API key in the dashboard settings and call the REST API with a Bearer token, or install the TypeScript SDK
Pros & Cons
Pros
- Aggressive entry price for the category: a permanent free plan with an agent and a number, then $29 a month with calendar booking and call transfers already included
- Genuinely fast to start — no code, no onboarding call, no payment card, and a guided wizard instead of prompt writing
- A live phone demo you can call without signing up, on a published toll-free number
- Unusually complete developer surface for this price point: documented REST API with request and response examples, TypeScript SDK, signed webhooks and a Markdown export aimed at AI agents
- Native integrations that write during the call rather than Zapier-glued afterwards, with additional webhook paths into ServiceTitan, Jobber and Housecall Pro
- Published DPA, TLS 1.3 in transit, AES-256 at rest and a configurable ninety-day default retention
- Transparent commercial terms: no setup fee, no contract, cancellation at any time and billing tied to calls actually answered
Cons
- No postal address and no company registration number anywhere on the site; the only legal name published, OnCallClerk Ltd, appears solely in the DPA
- The terms of service are governed by California law with AAA arbitration while the DPA is governed by the law of England and Wales — two incompatible jurisdictions for one service
- The terms of service display a 1-800-REAGENT phone number that has nothing to do with the product, a template artefact left uncleaned
- The DPA points to a subprocessor list at /subprocessors that returns a 404, so no list is actually published
- SOC 2 is claimed in a single sentence on the about page, with no trust page, no report and no named auditor
- Paid plan tiers are rendered client-side: only the $29 entry point and the $99–$299 range are readable, so the tier names and what each includes cannot be verified
- No mobile app, no documented training opt-out, no minimum age in the terms, and number provisioning documented only for the United States
Pricing & Plans
A permanent free plan is available and includes one AI agent together with a phone number, with no payment card required. The cheapest paid tier is $29 per month and already includes calendar booking and call transfers. Higher tiers are quoted between $99 and $299 per month. Annual billing is advertised as two months free, a saving of 20% against monthly. Every plan carries a fourteen-day free trial, with no setup fee and no contract, and billing is tied to calls actually answered.
- one AI agent with a phone number
- kept for as long as you want
- no payment card required
- calendar booking
- call transfers and 24/7 coverage included from this level
- Higher tiers — $99 to $299 per month
- per the vendor's own comparison table
- Annual billing — two months free
- roughly 20% off
- available on any paid tier
- Agency white-label — price not published
- arranged through the vendor's contact route
- the paid tier names are rendered client-side and are not readable in the static page
- so only the price points above can be confirmed
Data, GDPR & hosting
A consolidated view of how OnCallClerk handles your data.
GDPR overview
OnCallClerk claims GDPR compliance explicitly and backs part of that claim with documents. A data processing agreement is published at /dpa, binding on sign-up, and states that it covers Article 28. Roles are defined: the vendor is processor, the customer controller. The privacy policy lists data subject rights — access, rectification, erasure, restriction, portability and objection — with a thirty-day response, sets out CCPA rights separately, promises breach notification without undue delay, one audit per year and assistance with impact assessments. Transfers outside the UK and EEA use standard contractual clauses. Two gaps remain: no Article 27 EU representative is named anywhere, and no data protection officer is designated. The subprocessor list the DPA points to at /subprocessors returns a 404, so the transparency obligation that document creates is not actually met.
Who owns the data?
Under the terms of service you keep ownership of everything you supply — call scripts, greetings and business information — and grant OnCallClerk only the licence it needs to run the service. For call data the roles are stated explicitly: OnCallClerk acts as a data processor under the GDPR while your business is the data controller, so processing happens only on your documented instructions. You choose the lawful basis and you are responsible for notifying callers. The privacy policy says the vendor never sells, rents or trades customer or end-user personal data, phone numbers and SMS content included. No registered address is published anywhere to identify the counterparty you are contracting with.
Reuse rights
As the controller you can retrieve and reuse your own call data freely. Recordings, transcripts, caller details and summaries are pushed into your calendar, spreadsheet, CRM or backend through native integrations and signed webhooks, and the vendor states it never becomes the source of truth. OnCallClerk itself processes that material to deliver the service — routing calls, generating agent replies, producing transcripts and summaries — plus support, reliability logging and legal compliance. On model training the wording is narrow rather than absolute: the privacy policy says any use for model evaluation or improvement is performed only with anonymised and aggregated data. No training opt-out control is documented anywhere on the site. Subprocessors are limited to unnamed cloud infrastructure and payment providers, and transfers outside the UK and EEA rely on standard contractual clauses.
Data retention & training
Hosting summary
OnCallClerk names no hosting country and no hosting region. The privacy policy refers only to unnamed cloud infrastructure providers for hosting and storage, and payment processors for billing. Both the privacy policy and the DPA frame the UK and EEA as the reference perimeter — personal data may be transferred and processed outside it where required, protected by standard contractual clauses or another lawful GDPR mechanism — but neither says where the servers actually sit. On security the site is more specific: personal data, including call recordings and transcripts, is encrypted in transit with TLS 1.3 and at rest with AES-256; access is restricted by role-based controls with authentication and logging of administrative access; regular audits, monitoring and penetration testing are claimed. A SOC 2 claim appears in one sentence on the about page, with no trust page, no report and no named auditor behind it. For the record, the domain resolves to a Google anycast address, but that is a network observation rather than a hosting commitment made by the vendor.
Things to keep in mind
Risks and trade-offs to weigh before adopting OnCallClerk.
- The publisher is barely identifiable: no postal address, no registration number, and the only legal name — OnCallClerk Ltd — appears in the DPA alone. If something goes wrong you have an email address and nothing else
- Two governing laws are declared for the same service: California with AAA arbitration and a class-action waiver in the terms, England and Wales in the DPA. Which one binds you is genuinely unclear
- The terms of service still display a 1-800-REAGENT phone number unrelated to the product, a sign the document was adapted from someone else's template rather than drafted for this service
- The DPA creates a subprocessor transparency obligation and then points at a page that does not exist, so you cannot see who else touches your callers' recordings
- Recording calls is legally your responsibility, not the vendor's: the terms explicitly put obtaining caller consent on you, and the rules differ by state and by country
- The privacy policy says model evaluation and improvement use only anonymised and aggregated data, but no opt-out control exists, so you cannot exclude your call data from that process by configuration
- Handing your entire front line to an agent that never escalates a nuance a human would catch is a real operational risk — the vendor itself notes AI replies may contain errors, and callers in distress do not always fit a template
Setup & Integrations
Technical difficulty
Very low on the standard path. A guided wizard covers industry, voice, greeting, opening hours, escalation and forwarding, then hands you a local or toll-free number. There is no prompt writing, no phone system to configure, no onboarding call and no payment card; the vendor claims under ten minutes. The only mildly technical steps are redirecting your existing line at your carrier and connecting a calendar. The developer path sits at a different level: API keys, Bearer-authenticated REST calls, signed webhook endpoints to receive, and a TypeScript SDK to wire into Node, Next.js or edge runtimes.
Deployment
Integrations
Supported languages
Behind OnCallClerk
Social
Resources
All the official URLs gathered for verification and reference.
Alternatives
Tools that compete with or complement OnCallClerk.
Frequently asked questions
Is there a free plan, or only a trial?
How long does it take to get an agent answering calls?
Can I keep the phone number my customers already have?
Which languages does the agent speak?
Is there an API, and is there a mobile app?
How long are call recordings and transcripts kept?
Are my calls used to train AI models?
Is a data processing agreement available, and which law governs the service?
Should you pick OnCallClerk?
OnCallClerk delivers a lot for the money. The free tier gives you a working agent and a phone number, the $29 paid tier already carries calendar booking and call transfers, and the developer surface — a documented REST API, a TypeScript SDK, signed webhooks and a white-label console — is unusually complete at that price. The live phone demo, callable without signing up, lets you judge the voice quality yourself in thirty seconds, which is worth more than any feature list. For an owner-operator in a trade, a small practice or a property manager losing after-hours calls, the proposition is easy to test and cheap to abandon.
The reservations are about the vendor, not the product. No postal address and no registration number appear anywhere; the only legal name published, OnCallClerk Ltd, surfaces in a single line of the data processing agreement. The terms of service invoke California law while that same DPA invokes the law of England and Wales, and the terms still carry a phone number belonging to some other product entirely. The subprocessor list the DPA promises returns a 404. SOC 2 is asserted in one sentence with nothing behind it. The domain was registered in July 2025 and the first archived product page dates from November 2025, so this is a very young company describing itself in confident numbers.
None of that makes the tool a bad buy at $29 a month with no contract. It does mean that anyone with procurement, compliance or a legal team should ask for the registered entity, the subprocessor list and the audit report before signing, and that the trial is the right way in rather than an annual commitment.
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