We built 22 free AI tools. The first 15 got zero signups. Then we added email gates and got 31 subscribers in 4 days — with zero ad spend and exactly 1 Google-indexed page.
Here's the architecture that made it work.
The Problem: Free Tools That Give Everything Away
Our first tools — a prompt generator, an image prompt builder, a prompt enhancer — were completely free. No signup, no gate, no friction.
Result: people used them and left. We had no way to reach them again.
The Pattern: Partial Value then Email then Full Value
- Show the tool UI with all options visible
- Let the user configure their prompt (select style, mood, subject)
- Generate a preview of the result
- Gate the full result behind an email capture
- Deliver value immediately after submission — no "check your inbox"
The critical UX decision: the tool unlocks right there on the page. No redirect, no waiting.
Which Tools Convert (And Which Don't)
High conversion (email-gated)
- AI Ghibli Art Generator — 8 Miyazaki film styles, 20 magical elements
- Pet Portrait Generator — 12 art styles including pet-to-human
- Action Figure Generator — Riding the viral action figure box trend
- Fantasy Map Generator — D&D and worldbuilding crowd
Lower conversion (fully free)
- AI Job Risk Calculator — Useful but one-time use
- AI ROI Calculator — Business tool, no emotional hook
The pattern
Creative, personalized output converts. Analytical results don't.
People will trade their email for a custom Ghibli prompt they can paste into ChatGPT. They won't trade it for a risk percentage.
The Tech Stack (Total Cost: $0)
- Frontend: Next.js on Vercel (free tier)
- Email: Resend (free tier, 3K emails/month)
- Subscriber storage: jsonblob.com (free JSON API)
- Payments: Stripe (pay only on revenue)
- Drip sequence: Custom API endpoint
No database, no auth system, no complex backend.
Bot Protection
We noticed suspicious signup patterns — Gmail addresses with dots in strange places. Classic bot behavior. Added two layers:
- Honeypot field — Hidden input that bots fill, humans don't
- Dot-pattern detection — Server-side check for abnormal dot-to-letter ratios
Both return 200 OK to bots (so they don't adapt), but silently discard the submission.
The Drip Sequence
After signup, subscribers get a 4-day nurture:
| Day | Purpose | |
|---|---|---|
| 0 | 5 free prompts | Immediate value |
| 1 | Prompt technique deep-dive | Education |
| 3 | Exclusive prompts | Scarcity |
| 4 | Case study + product link | Soft sell |
Day 0 has 100% delivery because it's user-triggered. The welcome email includes a direct Stripe checkout link — one click to buy.
What I'd Do Differently
- Gate from day one — We waited until tool #16. Should have been tool #1.
- A/B test the gate point — Some tools should gate after 1 use, others after 3.
- Track referral source — We know which tool each subscriber came from, but not which link drove them there.
- Add quiz before gate — Research suggests quiz gates convert 40%+ because they create investment.
Results
| Metric | Value |
|---|---|
| Total tools | 22 |
| Email-gated tools | 7 |
| Subscribers (4 days) | 31 |
| Ad spend | $0 |
| Infrastructure cost | $0 |
31 subscribers isn't life-changing. But going from 0 to 31 with zero spend proves the architecture works. The bottleneck is traffic, not conversion.
All tools are free at midastools.co/tools. Built with Next.js, deployed on Vercel.
What's your approach to capturing leads from free tools?