Benchmark #1 · SlotKeeper · Tested Oct 14–15, 2026

Base44 builds a working booking app in under 10 minutes

Verdict

Base44 got to a first working version of SlotKeeper, a booking and waitlist app for a demo yoga studio (Maple Yoga Studio), in 8–9 minutes, with no fix prompts and no clarifying questions. It then passed all 10 checklist items on the live URL. It deployed free in 4 clicks and finished on the free tier. We found 4 minor bugs and no critical or major ones. Final score: 92.25/100: 81 of 85 non-design points plus 11.25/15 for design, the average of two independent reviewer scores.

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What we tested

Benchmark #1 is SlotKeeper. Customers book slots and join a waitlist, and an owner manages slots and bookings. We tested it Oct 14–15, 2026 on Base44's free plan. Base44 didn't show which AI model it used. Our method: one fixed prompt, at most 5 fix prompts, no hand-editing of code, a 90-minute cap, a 10-item checklist and a fixed rubric (methodology).

Live app: maple-slot-flow.base44.app

How it went

We submitted the prompt at about 17:16 EDT, and the first working version was done by about 17:25. It needed zero fix prompts and asked no clarifying questions.

Base44 tested its own work while it built. It hit a platform rate limit, so it rewrote the booking functions to make fewer database calls. It also patched Radix dialog buttons that couldn't be clicked. It flagged that it couldn't verify the /admin redirect or the owner sign-up flow. Both passed later in our testing.

The stack is a React frontend with shadcn/Radix components, Base44's built-in database (Slot and Booking tables), backend functions, and built-in auth. Owner sign-up sends a 6-digit email code that expires in 10 minutes, so a fake address won't work.

Publishing used the in-tool Publish button: 4 clicks, about 45 seconds, free, and it gave us a public base44.app URL.

Checklist (all pass)

1. 3 seeded slots
2. Booking reduces spots left
3. Form validation
4. Bookings persist after refresh
5. Waitlist with position #1
6. Duplicate email blocked
7. Owner sign-up with email code, and logged-out /admin redirects to login
8. Create, edit and delete a slot
9. Cancelling auto-promotes waitlist #1
10. Stats line correct at every step

What broke

All 4 bugs are minor:

1. The name error banner stays up after it's fixed. To reproduce, submit an empty form, fill in the name, enter a bad email, and submit again.
2. Invalid emails (e.g. "abc") are caught only by the browser's native popup. There's no in-app message.
3. The free-plan "Edit with Base44" badge covers content on mobile on the public page.
4. A promoted booking still shows "#1". After auto-promotion, the admin list shows "#1 · Test Three", a leftover waitlist prefix.

Also noted (not scored as bugs): the admin's cancel "X" button has no accessible name; the seeded 9:30 slot is 90 minutes long; customers can't cancel their own booking (not requested).

Caveats

• No visible credit usage. We can confirm the build stayed on the free tier but can't say how many credits it used.
• Data persistence across a redeploy wasn't tested.
• Security was probed only at the UI level. We didn't test unauthenticated reads against the backend API.
• The design score is subjective. Both reviewers credited a cohesive, calm visual system, strong type pairing, a real hero image, and clear status chips. Points came off for the badge overlap on mobile and the generic owner login.

How Base44 compares

Pros and cons

Who it's for

Non-developers and small business owners who want a working booking site with an owner admin, deployed quickly and free. Before you rely on it, check how it handles backend security and redeploys, since we didn't test either.

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Disclosure: affiliate link. If you sign up through it, BenchCoded may earn a commission at no cost to you. It doesn't affect our scores. Learn more.

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