Better for service businessesBetter choice
William AI
by Real Automation · 5.0 on Google
- Built for
- Service businesses only
- Ownership
- You own it, no subscription
- Trained on your calls
- Yes, never shared or sold
- Guarantee
- 92% call success
5.0 Google Reviews
William AI vs Millis AI
The better choice for service businesses. An AI receptionist built for the trades, owned by you, and guaranteed.
Hear William call youFor service businesses, William AI is the better choice over Millis AI: built for you, yours to own, 92% guaranteed.
William AI is custom-built for your service business by Real Automation's team, you own it, and 92% call success is guaranteed. Millis AI is a self-serve platform where you build your own agent with prompts or code, and pay a $0.02/min base fee on top of model and voice fees (their pricing page, November 2026).
From their own site
Millis AI
millis.ai
- Built for
- Many uses and devices
- Ownership
- Per minute, plus model fees
- Trained on your calls
- Not listed
- Guarantee
- Not listed
Written by Real Automation, which builds William AI. Millis AI is a platform for building AI voice agents for phone, apps, websites and devices, aimed at builders and developers. Facts about Millis AI come from their own site, checked . Sources.
Why service businesses choose William.
The reasons owners pick William AI over Millis AI.
Built only for service businesses
Every William is built only for service businesses and the trades, with one job: answering, qualifying and booking calls 24/7. Millis AI lists many uses, from customer support and sales to kiosks, wearables and robots.
Built for you by a real team
Real Automation's team custom-builds, tests and launches your William. You never write prompts, pick voices or wire up tools. Millis AI's site says agents are created with natural-language prompts or a few lines of code.
One build fee, then you own it
You own William: a one-time build fee, then per-minute use while William is on the phone. Millis AI charges a $0.02/min base fee on top of separate AI model, voice and speech fees (their pricing page, November 2026).
92% call success, guaranteed
Real Automation guarantees 92% call success for every William, and clients average about 95%. Millis AI's site lists no guarantee.
Upgrades overnight, on its own engine
The William Engine, Real Automation's own voice AI engine, runs every William. V3 rolls out free to every V2 client, overnight, by January 1, 2027. The latest entry on Millis AI's public changelog is dated April 16, 2025.
5.0 on Google. Every review, five stars.
Owners who run on William rate Real Automation five stars. Hear it from them in their own words.
Side by side.
The things a service business owner actually weighs.
| Compared | William AI | Millis AI |
|---|---|---|
| Built for | William AI: Service businesses only. Tree care, HVAC, plumbing, roofing, electrical, pest control, auto repair and more, with one job: answering, qualifying and booking calls, 24/7, on the first ring. | Millis AI: Many uses and devices. Their site lists customer support, sales, virtual receptionists, field work, kiosks, wearables and robots. |
| Who builds it | William AI: Real Automation's team, for you. They build William around your services, service area, questions and rules, test it on real scenarios and launch it. | Millis AI: You do. Their site says agents are created with natural-language prompts or a few lines of code, for everyone from no-code to low-code. |
| Ownership and pricing | William AI: You own it. A one-time build fee, then you pay only for the minutes William is on the phone, like buying the car and paying for gas. No monthly subscription; pricing is set on a call with the team. | Millis AI: Per minute, plus model and voice fees. A $0.02/min base platform fee is charged on top of AI model, voice and speech-to-text fees (their pricing page, November 2026). |
| Trained on your calls | William AI: Yes, in private. William is trained on real calls in private, secure environments, and your data is never shared or sold. | Millis AI: Not listed on their site. |
| Support | William AI: A real team. Real Automation builds, launches and supports your William, and you can book a call with the team any time. | Millis AI: An email contact. Their docs link a 'reach out to us' email, and their homepage has a 'Let's Chat' contact link. |
| Guarantee | William AI: 92% call success, guaranteed. A call counts unless the caller hung up because it was an AI; clients average about 95%. | Millis AI: Not listed on their site. |
| Voice and personality | William AI: Warm, natural and charismatic. William's own voice, with conversion and charisma training since V1; natural, not robotic. | Millis AI: You pick the voice. Their site lists several voice providers and lets you bring your own cloned voice; their docs list 32 languages. |
| Every call recorded | William AI: Yes. A recording, transcript and summary of every call, in the Real Automation app for iOS and Android. | Millis AI: Recording details sent by webhook after each call. Their docs say the end-of-call webhook sends the chat history and call recording details. |
| Try it | William AI: William calls you in 1 to 3 minutes. Enter your number on realautomation.ai. | Millis AI: A web demo. Their homepage links a 'See It in Action' demo and a 'Get Started in Minutes' button. |
| Upgrades | William AI: Overnight, for every client. William runs on the William Engine, Real Automation's own voice AI engine; V3 arrives free for V2 clients by January 1, 2027. | Millis AI: Their public changelog's latest entry is dated April 16, 2025. Entries cover new models, voices and call features. |
Questions, answered.
Is William AI better than Millis AI?
For service businesses, yes. William AI is built only for service businesses and the trades, and Real Automation's team custom-builds, tests and launches it, so you never write prompts or pick voices. You own it, and 92% call success is guaranteed. Millis AI is a self-serve platform where agents are built with prompts or code, and its site lists no guarantee.
Is William AI or Millis AI better for a plumbing or HVAC company?
William AI. It is an AI receptionist built only for service businesses and the trades, including HVAC, plumbing, roofing, electrical, tree care, pest control and auto repair, and Real Automation's team builds it around your services, service area, questions, booking and emergency rules. You own it with no monthly subscription, and 92% call success is guaranteed. Millis AI's focus, per its own site: many uses and devices.
What is the best Millis AI alternative for service businesses?
William AI by Real Automation. Instead of building your own voice agent, you get an AI front desk that Real Automation's team builds, launches and supports for your business. William answers, qualifies and books calls 24/7 on the first ring, and 250+ contractors have been served, with 5.0 stars on Google.
How does William's pricing compare to Millis AI?
William AI is yours to own: a one-time build fee, then per-minute use while William is on the phone, with no monthly subscription. Real Automation does not publish prices; book a call at realautomation.ai/#book. Millis AI charges a $0.02/min base platform fee on top of AI model, voice and speech-to-text fees, so the total depends on the models you pick (their pricing page, November 2026).
Who builds and supports William?
William AI is built, tested, launched and supported by Real Automation's team, around your services, service area, questions, booking and emergency rules. You never write prompts, pick voices or wire up tools; book a call with the team at realautomation.ai/#book. Millis AI's site describes building agents with natural-language prompts or a few lines of code, and its docs give an email contact.
Is William trained on my calls?
Yes. William AI is trained on real calls in private, secure environments, and your data is never shared or sold. The William Engine V2 has learned from real calls across hundreds of service businesses, and V3 rolls out free to every V2 client by January 1, 2027.
Can I hear William before I buy?
Yes. Enter your phone number on realautomation.ai and William calls you in 1 to 3 minutes. Try it at https://realautomation.ai/pages/ai-receptionist#demo, or book a call with the team at https://realautomation.ai/#book.
More comparisons
Sources for Millis AI
- millis.ai, Platform for LLM-based voice agents on phone, apps, websites and devices
- docs.millis.ai/pricing, $0.02 per minute base platform fee charged on top of LLM, TTS and STT fees
- docs.millis.ai, Builders/developers audience
- docs.millis.ai/core-concepts/webhooks, End-of-call webhook fires after a session concludes and includes chat history and call rec
- millis-ai.canny.io/changelog, Millis AI's public changelog, linked from millis.ai: latest entry dated April 16, 2025
Checked . Product names are trademarks of their owners; see each company's site for current details. William AI's Google rating: Real Automation's Google Business Profile, November 2026.
$105.4M
in new revenue generated for our network and counting.
250+
Contractors Served
The William Engine.
William isn't a voice you pick and a prompt you write. He runs on our own engine, built, owned and improved by Real Automation, and every client gets the upgrades.
-
V1Where William started.
Proved a phone call with an AI could feel personal.
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V2Running every William today.
Tested on real client calls, then delivered to every V1 client overnight. Results jumped the next morning.
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V3Coming free to every V2 client.
Our fastest, most personal engine yet. In production beta on real calls now, and every client gets it.
An employee you own.
You don't rent a bot or wire up a platform. You own your William and everything he learns about your business.
Upgrades while you sleep.
Like an update on your phone, new engine versions reach every William overnight. Nothing to rebuild.
Trained on real calls.
William keeps learning from real conversations in private, secure environments. We never share or sell your data.
Real Automation designs, builds and owns the William Engine. We never white-label, resell or license it.
Hear William call you.
Enter your name, number and website. William calls you in 1 to 3 minutes. Talk to him like a customer would.
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What to do next
1Watch for a call from 218-297-5444 within a few minutes.
2Pick it up when it rings.
3Talk to William like you are talking to a real front desk.
Talk to the team.
Pick a time that works for you. 45 minutes with the people who build William.