The short answer
OnCallClerk is the cheapest flat-rate AI receptionist at $29/month, and the only option on this list guaranteed to stay under $100 at any call volume - because a flat plan has no per-call, per-minute, or per-caller metering to push you over budget in a busy month.
If you want an AI receptionist for under $100 per month in 2026, seven options are genuinely worth your time. Here they are, with OnCallClerk first and the rest in rough price order:
| Service | Starting price | Billing model | Fits under $100? | Best for |
|---|---|---|---|---|
| OnCallClerk | $29/mo | Flat monthly | Yes, at any volume | SMBs wanting a fully customizable AI agent on a predictable flat fee |
| Dialpad AI | $15/user/mo | Per user (bundled phone system) | Yes, for small teams | Teams that also want a full business phone system |
| Dialzara | $29/mo | Per minute | Yes, Starter and Growth | Short-call businesses OK with per-minute billing |
| Goodcall | $59/mo | Per unique caller | Yes, Starter and Growth tiers | Local businesses with simple, high-frequency calls |
| My AI Front Desk | $64.99/mo | Flat subscription (tiered) | Yes, base tier ($64.99) | Appointment-heavy businesses wanting flat scheduling |
| Smith.ai (AI) | $97/mo | Per call | Yes, at the entry tier only | Firms wanting AI plus live-human escalation |
| Retell AI | ~$0.07-$0.31/min | Pay-as-you-go | Yes, at low call volume | Developers building a bespoke voice agent |
Pricing verified September 2026 from each vendor's public pricing page. AI answering pricing moves fast - re-check the linked vendor sites before you buy.
For most small businesses, the winner under $100 is a flat-rate AI receptionist: it stays the same price whether you take 20 calls or 2,000, so a busy month never turns into a surprise bill. That is the whole reason the $29 flat OnCallClerk plan tops this list - it is the one price guaranteed to hold under $100 no matter how busy you get. But the right pick depends on your call volume and whether you need a human in the loop, so this guide walks through all seven.
Why the budget question matters
Small businesses miss roughly 62% of incoming calls, and every unanswered call is a customer who moves to the next result on Google. Harvard Business Review found that leads contacted within five minutes are 21x more likely to convert than those contacted after 30 minutes, and BrightLocal research shows 60% of consumers still prefer to call a local business directly. The phone is your highest-intent lead channel, and it is the one most owners cannot answer during the workday.
The obvious fix - hiring a receptionist - is expensive. Front-desk staff cost around $35,000 to $55,000 a year before benefits, and traditional answering services run $250 to $1,200 a month. For an owner-operator, neither is realistic. That is exactly the gap a sub-$100 AI receptionist fills: 24/7 coverage for less than the cost of a single missed job.
*Source: Each provider's published starting price as of August 2026. Retell AI excluded - usage-based per-minute billing that does not map to a flat monthly baseline.*
What "under $100 per month" actually means
The sticker price is only half the story. A $59 headline plan can cost more than a $29 one once your volume climbs, because the three services bill in completely different ways. Read the budget through the billing model, not the starting number:
| Billing model | How the price behaves | Under-$100 risk | Example |
|---|---|---|---|
| Flat monthly | Same price at any call volume | None - the ceiling is the sticker price | OnCallClerk ($29) |
| Per user | Scales with team size, not calls | Adds up once you pass ~6 users | Dialpad AI ($15/user) |
| Per unique caller | Scales with distinct callers per month | Tier jumps at 100 / 250 / 500 callers | Goodcall ($59 to $99) |
| Per call | Scales with total calls | Overage fees blow past $100 fast at volume | Smith.ai AI ($97 for 50 calls) |
| Per minute | Scales with talk time | Cheap at low volume, unpredictable at scale | Retell AI, Dialzara |
| Flat subscription (tiered) | Fixed within a tier, jumps at the next | Base tier fits; upper tier can exceed $100 | My AI Front Desk ($64.99 to $124.99) |
The practical takeaway: if you want a price that is guaranteed to stay under $100 no matter what, only a flat-rate plan gives you that. Metered plans can start under $100 and quietly climb past it in a busy month.
*Source: Relative predictability score based on how tightly each model caps monthly spend for a typical SMB call pattern.*
Compare live plans on the AI receptionist pricing page before committing, and model your own numbers with the savings calculator.
1. OnCallClerk - $29/month, flat
Billing: Flat monthly, no per-call or per-minute charges. | Under-$100 verdict: Cheapest option here and guaranteed to stay under $100 at any volume.
OnCallClerk is a no-code platform for building and deploying an AI voice agent. You pick a voice, describe how the agent should behave, add your business details, and go live in minutes. Because the plan is flat-rate, a hailstorm week or a post-campaign surge costs the same as a quiet one - the single biggest advantage when you are working to a budget.
What you get for under $100
- Flat $29/month with no usage metering on standard plans
- Custom voice and prompts - full control over personality, greeting, and what the agent collects
- Business hours with different behavior in and out of hours
- Escalation policies - transfer to a human on caller request, complex queries, or emergencies
- FAQ library the agent references during calls
- Phone number included (local or toll-free, 40+ countries)
- Developer API and TypeScript SDK for programmatic control
| OnCallClerk | Detail |
|---|---|
| Starting price | $29/month, flat |
| Overage fees | None on standard plans |
| Custom voice | Yes (9 voices) |
| Appointment booking | Yes |
| Human escalation | Yes, configurable |
| Setup time | Under 10 minutes |
Best for
Owner-operated and small service businesses (plumbing, dental, legal, property management) that want the phone answered 24/7 without watching a meter. If budget certainty matters, this is the safest pick under $100. Start free or read how it works.
2. Dialpad AI - from $15/user/month
Billing: Per user, bundled with a full business phone system. | Under-$100 verdict: Cheapest headline number, but it is a phone system with AI features, not a standalone receptionist.
Dialpad is a cloud communications platform - calling, video, messaging - with AI layered into the core product. Its AI Recept feature can route and answer calls, and every call gets real-time transcription and an automated summary.
| Dialpad AI | Detail |
|---|---|
| Starting price | $15/user/month; AI Pro from $25/user/month |
| Under $100 | Yes, for teams up to ~6 users on the base tier |
| Standalone receptionist | No - augments human agents |
| Transcription and summaries | Yes |
| Best fit | Teams replacing their phone system anyway |
Best for
Teams that need a full phone system and want AI transcription, summaries, and routing included rather than a dedicated receptionist. The per-user model means cost scales with headcount, so a solo operator pays little but a growing team can cross $100 quickly.
3. Dialzara - from $29/month
Billing: Per minute, with a bundle of minutes per tier. | Under-$100 verdict: Starter ($29) and Growth ($99) both fit; Pro ($199) does not.
Dialzara is a pure-AI answering service priced per minute, with a set of included minutes at each tier. The Starter plan is genuinely cheap, but there is a catch worth knowing before you sign up: call transfers - a basic receptionist function - are gated behind the $99/month Growth plan, so the $29 Starter cannot hand a caller to a live person.
| Dialzara | Detail |
|---|---|
| Starter | $29/month (includes 60 minutes) |
| Growth | $99/month (more minutes + call transfers) |
| Pro | $199/month (over budget) |
| Call transfers | Growth ($99) and up only |
| Under $100 | Starter and Growth |
Best for
Businesses with short, transactional calls that are comfortable with per-minute billing and do not need live transfers on the cheapest tier. Because it bills by talk time, a few long calls can burn through your minute bundle faster than a flat plan - so if your call lengths vary, the flat OnCallClerk plan stays more predictable.
4. Goodcall - from $59/month
Billing: Per unique caller. | Under-$100 verdict: Starter ($59) and Growth ($99) both fit; Scale ($199) does not.
Goodcall is an AI phone agent built for local businesses, with a guided setup and a free tier for very small operations. It shines on straightforward, high-frequency calls - hours, directions, basic service questions.
| Goodcall | Detail |
|---|---|
| Starter | $59/month (100 unique callers) |
| Growth | $99/month (250 unique callers) |
| Scale | $199/month (over budget) |
| Free tier | Yes, limited |
| Custom voice | Limited |
Best for
Local brick-and-mortar businesses with simple call needs and a predictable base of recurring callers. If your call complexity is low, Goodcall's per-caller model is fair value under $100. If you need deep customization, see the Goodcall alternative comparison.
5. My AI Front Desk - from $64.99/month
Billing: Flat monthly subscription, tiered. | Under-$100 verdict: The $64.99 base plan fits comfortably; the $124.99 Pro plan does not.
My AI Front Desk is an AI receptionist built around scheduling, which makes it a natural fit for appointment-heavy businesses like salons, clinics, and service shops. The base plan covers call answering and basic scheduling; advanced integrations sit on the $124.99 Pro tier, which pushes past our budget. Annual billing shaves roughly 20% off if you commit for the year.
| My AI Front Desk | Detail |
|---|---|
| Base plan | $64.99/month (answering + basic scheduling) |
| Pro plan | $124.99/month (advanced integrations, over budget) |
| Annual discount | ~20% off with yearly billing |
| Under $100 | Base tier only |
| Best fit | Appointment-driven businesses |
Best for
Appointment-led businesses that want scheduling front and center and can stay on the base tier. If you need the advanced integrations, though, the Pro plan crosses $100 - at which point a flat plan like OnCallClerk keeps every feature under budget.
6. Smith.ai (AI plan) - from $97/month
Billing: Per call. | Under-$100 verdict: Only the entry AI tier fits, and only at low call counts - overage pushes you past $100 fast.
Smith.ai takes a hybrid approach: AI handles routine calls and hands off to a live human receptionist when the conversation needs one. That human backup is the reason firms pay a premium.
| Smith.ai (AI) | Detail |
|---|---|
| AI plan | $97/month (50 calls) |
| Overage | Per-call fees beyond the allowance |
| Live-human escalation | Built in |
| Under $100 | Only at or below 50 calls/month |
| Best fit | Legal, medical, sensitive intake |
Best for
Law firms, medical practices, and professional services that need a human in the loop and stay near the 50-call entry allowance. Above that, per-call fees make it the least budget-safe option on this list.
7. Retell AI - roughly $0.07-$0.31/minute
Billing: Pay-per-minute plus telephony. | Under-$100 verdict: Comfortably under $100 at low volume; unpredictable as call minutes grow.
Retell AI is a developer-first platform for building custom voice agents. You assemble the agent - model, voice, prompts, call flow - and point an inbound number at it.
| Retell AI | Detail |
|---|---|
| Pricing | ~$0.07-$0.31/min + Twilio telephony |
| Monthly cost at ~200 min | Roughly $14-$62 |
| Fixed monthly plan | No |
| Setup | Developer time required |
| Best fit | Technical teams wanting full control |
Best for
Developers and technical teams who want to ship a bespoke agent and have engineering time to invest. At low volume it is one of the cheapest ways to run a voice agent; it is not a drop-in receptionist for a non-technical owner.
All seven compared side by side
| Feature | OnCallClerk | Dialpad AI | Dialzara | Goodcall | My AI Front Desk | Smith.ai (AI) | Retell AI |
|---|---|---|---|---|---|---|---|
| Starting price | $29/mo flat | $15/user/mo | $29/mo | $59/mo | $64.99/mo | $97/mo | ~$0.07-$0.31/min |
| Price stays under $100 | Always | Small teams | Starter/Growth | Starter/Growth | Base tier | Entry tier only | Low volume only |
| Standalone AI receptionist | Yes | No | Yes | Yes | Yes | Yes (hybrid) | Yes (DIY) |
| Custom voice and prompts | Yes | No | Limited | Limited | Limited | Limited | Yes |
| Phone number included | Yes | Yes | Yes | Yes | Yes | No | Via Twilio |
| Appointment booking | Yes | Yes | Yes | Yes | Yes (focus) | Yes | Via integrations |
| Human escalation | Yes | Yes | $99 tier+ | Yes | Yes | Built in | Yes |
| No-code setup | Yes | Yes | Yes | Yes | Yes | Yes | Developer-focused |
| Best for | Budget certainty | Bundled phone system | Short per-min calls | Simple local calls | Scheduling | Human backup | Custom builds |
Notice that AnswerConnect and most live human answering services are absent - they start around $325/month and cannot fit a sub-$100 budget. If you want the full field including premium and hybrid options, see the broader best AI phone answering services guide.
What you actually pay per call
Starting prices hide the real question: what does each option cost per call at your volume? Metered plans look cheap at the headline, but the per-call math shifts fast as volume climbs. The tables below estimate effective cost per call at three monthly volumes (assuming roughly 3-minute average calls for per-minute plans). Flat-rate pricing is the only model where the cost per call keeps falling the more calls you take.
At 50 calls per month
| Service | Monthly cost | Effective cost per call |
|---|---|---|
| OnCallClerk | $29 flat | $0.58 |
| Goodcall | $59 | $1.18 |
| My AI Front Desk | $64.99 | $1.30 |
| Smith.ai (AI) | $97 | $1.94 |
| Dialzara | ~$99 (Growth) | ~$1.98 |
At 250 calls per month
| Service | Monthly cost | Effective cost per call |
|---|---|---|
| OnCallClerk | $29 flat | $0.12 |
| My AI Front Desk | $64.99+ | $0.26+ |
| Goodcall (Growth) | $99 | $0.40 |
| Dialzara | $199+ (Pro) | $0.80+ |
| Smith.ai (AI) | ~$485+ | ~$1.94+ |
At 1,000 calls per month
| Service | Monthly cost | Effective cost per call |
|---|---|---|
| OnCallClerk | $29 flat | $0.03 |
| Goodcall | $199+ | $0.20+ |
| Dialzara | Custom / high | $0.80+ |
| Smith.ai (AI) | ~$1,900+ | ~$1.94+ |
The pattern is the point: OnCallClerk's flat $29 is the only plan whose cost per call keeps dropping as you grow - from about $0.58 at 50 calls to roughly 3 cents at 1,000 - while every metered plan holds flat or climbs. At low volume a metered plan can be competitive; past roughly 100 calls a month, flat-rate wins decisively and never risks a surprise overage. These are estimates - your real cost depends on call length and mix, so model your own numbers with the savings calculator.
Which sub-$100 option should you pick?
Choose by call volume
| Calls per month | Best fit under $100 |
|---|---|
| Under 100 | OnCallClerk ($29 flat) - metered models waste money at this volume |
| 100 - 250 | OnCallClerk or Goodcall Growth ($99) |
| 250 - 1,000 | OnCallClerk - flat rate wins as metered plans climb |
| 1,000+ | OnCallClerk - the only option here still guaranteed under $100 |
Choose by what you value most
| Priority | Best fit under $100 |
|---|---|
| Guaranteed predictable cost | OnCallClerk ($29 flat) |
| Custom voice and personality | OnCallClerk or Retell AI |
| Live-human fallback | Smith.ai (AI plan) |
| Full phone system included | Dialpad AI |
| Pay only for what you use | Retell AI (per-minute) |
| Appointment-first scheduling | My AI Front Desk or OnCallClerk |
| Simplest setup for a local shop | Goodcall or OnCallClerk |
Does a sub-$100 receptionist pay for itself?
Almost always, and quickly. The math is not about the monthly fee - it is about the jobs you stop losing to voicemail. If your average job is worth even $200 and your AI receptionist captures one extra lead a month that would otherwise have hung up, a $29 to $99 plan has already paid for itself several times over.
| Scenario | Monthly cost | Extra jobs captured to break even |
|---|---|---|
| $200 average job | $29 (OnCallClerk) | Less than 1 |
| $200 average job | $99 (Goodcall Growth) | 1 |
| $2,000 average job | $97 (Smith.ai AI) | Less than 1 |
Speed is why the capture rate is so high. Because an AI answers on the first ring, every caller lands inside the five-minute window where conversion is highest:
*Source: Relative conversion lift based on Harvard Business Review speed-to-lead findings.*
Run the numbers on your own missed-call volume with the AI receptionist savings calculator, or read the full breakdown in the real cost savings of AI receptionists.
Why voicemail is not the free alternative
The tempting way to spend $0 is to let unanswered calls roll to voicemail. The data says that is the most expensive option once you count lost deals. Most callers will not leave a voicemail when a competitor is one Google tap away, and replacing that lost revenue with more staffing is costly when receptionist wages average around $21/hour before overhead.
| Caller behavior after reaching voicemail | Share of business callers |
|---|---|
| Hang up and call a competitor | 50% |
| Hang up and search Google again | 22% |
| Leave a voicemail and wait | 18% |
| Try another channel (email, chat) | 10% |
The 50% who call a competitor are your highest-intent, ready-to-buy leads. That is why missing calls costs more than most owners realize, and why even the cheapest AI plan beats free voicemail. See how an AI receptionist answers those calls instead.
Getting started on a budget
You do not need a big budget or a technical background to go live. Most owners are answering calls the same day.
| Quick-start step | What you do | Time |
|---|---|---|
| Step 1 | Create an account and claim a phone number | 3 minutes |
| Step 2 | Add business facts, hours, and service rules | 8 minutes |
| Step 3 | Configure escalation and transfer paths | 5 minutes |
| Step 4 | Run 5 test calls and tune the prompt | 12 minutes |
| Step 5 | Go live and review the first week of transcripts | 7 days |
Start with the cheapest flat-rate plan, route your after-hours and overflow calls to it first, and expand once you trust the transcripts. Try OnCallClerk free or compare every plan on the pricing page.
Keep Reading
- Best AI Phone Answering Services (2026) - The full field, including premium and hybrid options above $100.
- The Real Cost Savings of AI Receptionists - Detailed financial breakdown with real numbers.
- How to Hire an AI Receptionist - A practical framework for evaluating platforms.
- Answering Service Cost for Contractors - What trades actually pay, and why flat-rate wins in busy season.
Explore our virtual receptionist and phone answering service pages, or see industry solutions like our plumbing answering service and roofing answering service.
Frequently Asked Questions
Q: What is the cheapest AI receptionist that still works 24/7?
OnCallClerk is the cheapest AI receptionist that runs 24/7, at $29/month flat with no per-minute or per-call fees. Because the price is flat, it stays the cheapest option even in your busiest month, when metered plans like Dialzara, Goodcall, and Smith.ai can quietly climb past $100.
Q: Is a $29 to $99 plan actually good enough for real customers?
For routine inbound calls - hours, pricing, booking, lead capture - yes. A well-configured budget platform like OnCallClerk handles natural interruptions, answers your configured questions accurately, and escalates to a human on the edge cases. Quality depends far more on how well you configure the agent than on the price tier.
Q: Will a cheap plan hit me with hidden overage fees?
It depends on the billing model. Per-call, per-minute, and per-caller plans - Smith.ai, Dialzara, and Goodcall respectively - can add overage once you pass their allowance, so a $59 or $97 plan can exceed $100 in a busy month. OnCallClerk's flat plan has no usage metering, so the $29 sticker price is the ceiling.
Q: Do sub-$100 plans include a phone number?
Most do. OnCallClerk, Goodcall, Dialpad, Dialzara, and My AI Front Desk include a number; Smith.ai does not bundle one on the AI plan; and Retell AI uses your own Twilio number. Check what is included before comparing headline prices, because a separate number adds cost.
Q: Should I replace my receptionist or just cover missed calls?
For most small businesses, start by covering after-hours, weekends, and overflow with a flat-rate agent like OnCallClerk. Keep any human staff focused on high-value conversations while the AI catches the routine and missed calls. That approach delivers the fastest ROI and the lowest risk on a tight budget.