Zullo vs instantreply.ai: An Honest Head-to-Head for Trade Shops

Two companies will text your missed calls back with AI: Zullo and instantreply.ai. One is $39–79 a month, flat, and you set it up yourself in minutes. The other starts around $160 a month for SMS, is built and maintained for you, and answers across voice, SMS, email, and WhatsApp. They're both good products for different shops. Here's the honest head-to-head.

Disclosure: Zullo wrote this page. instantreply.ai's numbers below come from their published pricing page, checked October 2026 — verify current pricing on their site before buying. Where they genuinely beat us, we say so.

What each one actually is

Zullo is self-serve software for one job: never losing a missed call. You set your carrier's forward-on-no-answer once. Every missed call gets an instant text (after the caller presses 1 to opt in), two or three qualifying questions — what they need, how urgent, where — and you get the lead summary by text and email. Free trial, month-to-month, no porting.

instantreply.ai is a done-for-you AI service. Their team builds AI agents that live inside your business across four channels — voice, SMS, email, WhatsApp — qualify leads, and book them onto your calendar. Onboarding is a discovery call, then they handle the build, the CRM and calendar integration, the A2P registration, and ongoing maintenance. You don't configure software; you approve what they built.

Price, side by side

Zullo: $39/month (Solo) or $79/month (Pro). Flat. The thousandth text costs the same as the first.

instantreply.ai: AI SMS is $99 for the first month, then $99/month plus about $0.061 per reply — at 1,000 replies a month that's roughly $160/month total. AI Voice is $199 first month, then $297/month with 100 minutes included. Both channels together run about $396/month. Both companies are month-to-month; instantreply.ai additionally locks your rate for as long as you stay.

Illustrative math, labeled as such: a shop exchanging roughly a thousand texts a month pays $79 flat on Zullo Pro versus about $160 on instantreply.ai's SMS plan — before voice. The gap is the price of done-for-you: you're paying people to build and maintain the system, not just software.

Getting started

Zullo: set call forwarding, pick your plan, done — most shops are live the same day, and there's a free trial to prove it works on your real calls. instantreply.ai: book a discovery call, they build everything over about five days, you approve test calls before anything goes live. No free trial, but they run a live demo where their AI calls you back. If you want zero setup work, their model wins; if you want to be running today, ours does.

Where instantreply.ai genuinely wins

• Four channels, not one: voice AI that answers on the first ring, plus SMS, email, and WhatsApp. Zullo is SMS text-back — if you want an AI voice receptionist, that's them.
• Done-for-you: they write the scripts, connect the CRM and calendar, handle A2P registration, and maintain it monthly. With Zullo you do a five-minute setup yourself.
• The 60-second guarantee: every lead gets a reply in under 60 seconds or the month is free. That's a real SLA; we don't offer one.
• Higher lead volumes: their own guidance says the service fits businesses getting 20+ leads a month. Bigger shops get more of their money's worth.

Where Zullo genuinely wins

• Price: roughly half the cost for SMS at typical volumes, flat — no per-reply meter that grows with your busiest months.
• Simplicity: one job, done well. No discovery calls, no five-day build, no channels you didn't ask for.
• Control: it's your system to tweak, not a service you wait on. Change a question yourself in minutes.
• Free trial: try it on your real missed calls before paying. They don't offer one.

Which should you pick?

If your problem is exactly one thing — missed calls going to voicemail — and you want it fixed this week at a flat price, that's Zullo. If your problem is bigger — leads leaking across calls, forms, email, and chat, with the volume to justify $400+/month for someone to run it all — that's instantreply.ai. There's no shame in either answer; they're different tools for different shops.