You need a lead-gen form. You type the same brief into Typeform, Tally, and Fillout’s AI generators. You get three different forms — and the one worth using isn’t the one you’d expect. I ran this Typeform AI vs Tally vs Fillout test with two briefs — one for lead gen, one for a 5-question survey — and the results changed which tool I’d pay for.
The Test: Same Brief, Three AI Generators
Each tool got the same plain-English prompt. No hand-holding, no prompt engineering tricks.
Brief 1 (lead gen): Collect name, email, company size, budget range, and timeline for a SaaS demo request.
Brief 2 (survey): A 5-question NPS-style post-onboarding feedback form.
I evaluated each AI’s output on three things: question phrasing and flow, completion rate drivers (conversational UI vs. traditional layout), and whether the generated form actually qualifies leads — or just collects fields. Every ai form builder comparison in 2026 tests features. This Typeform AI vs Tally vs Fillout test focuses on what matters: the output.
So which tool actually won?
Lead-Gen Results: Typeform Polishes, Tally Ships, Fillout Qualifies
Typeform AI generated a conversational, one-question-at-a-time flow. Standout Typeform AI features include polished microcopy, a progress indicator, and a conditional logic branch for budget range — select “under $5k” and it skips the timeline question. Smart. But it missed company-size qualification entirely, which weakens lead scoring downstream. (Once you’ve got qualified leads flowing in, I’ve calculated which AI CRM pays for itself — the CRM choice determines whether that qualification data actually gets used.)
Tally AI shipped a clean traditional form in under 30 seconds. All five fields present, no conditional logic, no microcopy, no personality. For a quick internal form, that’s fine — for converting a paid ad click into a sales-qualified lead, it’s leaving money on the table. The free tier handles this perfectly, though.
Fillout AI surprised me. It generated dropdown qualifiers and piped answers into follow-up questions — select “Enterprise” for company size and it asks about team count. Best lead qualification structure of the three, but the design polish lags behind Typeform noticeably. It thinks like a sales ops person, not a designer.
The honest take: Typeform’s AI produces the most conversion-ready output. Fillout’s AI thinks harder about data quality. Tally’s AI is the fastest path from nothing to a working form.
Can Tally’s AI generate forms as good as Typeform? For speed and basic field collection, absolutely — Tally ships a working form in under 30 seconds. But for conversion-optimized lead-gen forms with conditional logic and polished microcopy, Typeform’s AI output is clearly ahead.
But lead gen is only half the picture. Surveys are a completely different use case — and the winner flips.
Survey Results and the Completion Rate Reality Check
Which form builder has the highest completion rate? Typeform’s conversational format claims 40–60% completion versus 25–35% for traditional layouts — but those numbers come from Typeform’s own blog, not independent testing. Real-world lead-gen conversions average 5–15%, and the bigger driver is fewer fields and stronger copy, not the form builder you choose.
For the NPS survey, most ai survey builder tools default to a conversational flow — but Tally’s traditional layout actually works better. Respondents don’t want a conversational UI for quick feedback — they want to scan five questions and submit. Typeform’s one-at-a-time format feels overwrought for a 5-question form. It adds friction, not engagement.
Fillout lands in the middle: clean layout, decent AI question phrasing, nothing standout.
Typeform claims 40–60% completion rates versus 25–35% for traditional forms. That’s from their own blog, not independent testing. Real-world benchmarks for lead-gen forms hover 5–15% depending on traffic source — conversational UI helps for longer forms, but the gap isn’t as dramatic as marketed.
The real driver of completion rates isn’t the form builder’s brand. It’s fewer fields and better copy. A 3-field Tally form will outperform a 10-field Typeform every time — same principle behind why the best AI presentation tool depends more on what you put in than which brand you pick.
So if the best tool depends on the use case and completion rates are overhyped, how do you decide which one to pay for?
The Cost-Per-Lead Math Nobody Else Is Doing
Typeform: $59/mo (Plus) for 1,000 responses. If 8% convert to leads, that’s 80 leads at $0.74 each.
Tally: Free for unlimited forms and responses. Even at $29/mo (Pro) for custom domains, cost per lead approaches zero at volume.
Fillout: $19/mo (Starter) for 1,000 submissions. If you’re piping into Notion or Airtable, you skip Zapier ($20+/mo saved) — native integrations are Fillout’s real value prop.
The real question: does Typeform’s better completion rate justify 3x the cost? Only if you’re running high-stakes conversion where a 10% lift in completions materially changes revenue. For a SaaS demo request form on a landing page getting 500 visitors/month — I built the same page in three AI website builders using the same comparative methodology — the math works. For an internal feedback survey, you’re overpaying by definition.
Now you know the output quality, the completion reality, and the cost. Here’s which one to actually use.
Which One Wins (It Depends, But Not in a Cop-Out Way)
Use Typeform if you’re building lead-gen forms for high-value conversions — SaaS demos, premium product inquiries, event registrations — and $59/mo is noise in your budget. The AI generates the most conversion-ready output, and the conversational UI genuinely helps when you’re asking 5+ qualifying questions. It’s the best ai form builder when the job is converting expensive traffic.
Use Tally if you need forms shipped fast, you’re budget-conscious, or you’re running surveys. The AI is basic, but the free tier is unbeatable. For surveys specifically, the traditional layout is actually better than conversational — respondents finish faster. If you’re building automations around form data, Tally’s webhook support handles most workflows.
Use Fillout if you live in Notion or Airtable and need forms that pipe qualified data directly into your workspace without Zapier glue. The AI’s lead qualification logic is the best of the three — it thinks about data structure, not just pretty fields. For teams already in the no-code ecosystem, Fillout’s integration depth is the differentiator.
Three tools, same brief, three different strengths. The surprising part isn’t that one tool is best — it’s that each one is best at something the other two genuinely can’t match.
That’s one less tool decision to overthink.