Grasshopper gives you a business number and an extensions menu. Calls still need a human to pick up. KaiCalls gives you a business number AND an AI secretary that picks up, books, and follows up — for $40 more a month.
Number, extensions, voicemail. Still needs you to answer.
Number, 150 minutes of AI answering, booking, texting, summaries.
Every missed call that would have gone to voicemail. Probably pays for itself in a week.
The honest version
If you already have someone answering the phone, Grasshopper's cheaper. If you don't, Grasshopper still won't answer the phone.
Where Grasshopper holds up
Cheaper if all you need is a business number and an extensions menu.
Lets you keep your existing answering routine — you and your team still pick up.
Good fit when you already have someone at a desk handling calls all day.
Where KaiCalls pulls ahead
The calls actually get answered when you can't pick up — not sent to voicemail.
Books appointments straight into your calendar without anyone touching a keyboard.
Sends confirmation texts and addresses to customers automatically.
Texts you a summary of every call. You skim it in three seconds.
Side by side
Skim this. The FAQ below covers the rest.
Which one fits you
The right one depends on whether you have someone to answer the phone today.
KaiCalls.
Grasshopper will route every missed call to voicemail. Kai answers, books the job, texts the customer back, and texts you the summary. The math here is brutal in favor of Kai.
Grasshopper can work.
If you already have someone picking up, you mostly need extensions, a menu, and a virtual number. That's exactly what Grasshopper does, for less money than Kai. Just be honest about how often your receptionist is actually at her desk.
KaiCalls.
KaiCalls includes the phone-system features Grasshopper sells. Adding Kai on top of an extensions menu costs you nothing extra — it just gives the menu a backstop.
KaiCalls.
You're paying for two products to do half a job each. One $69-$299 KaiCalls plan replaces both with one bill, one number, and one secretary.
The fair questions
Direct answers to the things that should worry you about any phone service.
What Kai actually does on every call: picks up, decides, follows up, briefs you.
Read itLocked to your business. Texts and outbound calls follow TCPA. You can delete anything.
Read itFive backup paths — transfer to you, text alert, voicemail with transcript, callback, or team handoff.
Read itFive tiers, $69 to $999. Every feature on every plan. Flat overage.
Read itFAQ
The questions owners ask before they switch.
Grasshopper is a virtual phone system — you get a business number, extensions, a menu (press 1 for sales), voicemail, and call forwarding. There's no AI; calls still need a person to answer. KaiCalls is a phone service with an AI receptionist built in. The number doesn't just ring — it picks up, books appointments, texts customers back, and tells you what happened.
Yes, for small businesses that don't have someone sitting at a desk to answer the phone. If you and your business partner answer your own calls and just want a professional setup with extensions, Grasshopper is fine. If you need the phone to be answered when you're working, KaiCalls is what you want.
Grasshopper starts at $29/month for one number, three extensions, and one user, no minutes included for AI (because there's no AI). KaiCalls starts at $69/month with one number, 150 minutes of AI-answered calls, plus all the booking, texting, and follow-up features.
No. Grasshopper routes calls to your cell or voicemail. If you don't pick up, it goes to voicemail. There's no AI to answer in your place — that's what KaiCalls adds.
When you already have someone (you, a partner, an office manager) answering the phone all day, and you just want a professional setup — extensions, voicemail menu, area-code choice. Grasshopper is good at being a phone system. KaiCalls is good at being a receptionist.
When the phone rings while you're on a job, in a chair, or with a customer. When you've lost work because you couldn't get to the phone. When you don't want to hire a receptionist but you do want the calls answered.
You don't need to. KaiCalls includes the phone-system piece — your business number, extensions if you want them, voicemail, transfers. Adding Grasshopper on top would be paying twice for the same plumbing.
Other comparisons
Same honest treatment for the other phone-system options.
Another free/cheap virtual number option to compare.
Both have AI on the phone. Here's the difference.
Compare against a premium human answering service.
Broader comparison against the whole answering category.
Bottom line
That's the whole choice. The $40/month gap pays for itself the first time a customer gets through who would have hit voicemail.
Grasshopper is a fine phone system if your team already answers the calls.
KaiCalls is the phone system AND the person who picks up. Same number, same bill, one secretary who never takes a sick day.