48-hour guide

10 mini-SaaS you can build in just 48 hours

Pick one, build it on day 1, launch it on day 2. Every project uses the same stack so you do not lose hours choosing tools:

Next.js on Vercel, Supabase (database and login), Resend (email), Stripe (payments) and the Claude API when it needs AI.

  1. 01

    Competitor price alert

    Paste a product URL and get an email when its price changes.

    Who pays
    Small online shops.
    Stack
    Supabase (daily cron) + Firecrawl + Resend.
    Day 1
    A urls table and a cron job that reads the price and stores it.
    Day 2
    The email when it changes, and Stripe to go from 3 free URLs to 50 paid.
    First users
    Shopify and e-commerce founder communities, where people ask how to watch competitors.
    Demand: 69/1004 conversations found
    People talking about this right now
    • «Best way to see competitors' Google ads across 100s of keywords/searches?» · 2 days ago
    • «Selling on Amazon is now race to the bottom?» · 11 days ago · 50 comments
    +2 more in the report
    Start getting customers for this idea →
  2. 02

    One-click PDF invoices

    Fill in client and amount and get the invoice with its sequential number.

    Who pays
    Freelancers.
    Stack
    Next.js + Supabase + react-pdf + Resend.
    Day 1
    The form, the numbering and the PDF.
    Day 2
    Send the invoice by email from the app, and a paid plan for unlimited invoices.
    First users
    Freelancer groups and forums, where invoicing comes up every month.
    Demand: 59/1001 conversation found
    Start getting customers for this idea →
  3. 03

    Bookings for one business

    A calendar with free slots, booking in two clicks and a reminder the day before.

    Who pays
    Hairdressers, physios and personal trainers.
    Stack
    Next.js + Supabase + Resend + Stripe (a deposit so people show up).
    Day 1
    Opening hours, slots and the booking.
    Day 2
    The email reminder and the deposit.
    First users
    Local businesses near you: show it working on their own calendar.
    Demand: 79/1004 conversations found
    People talking about this right now
    • «If you take a deposit when clients book, what changed?» · 3 days ago · 3 comments
    • «Fractional / independent folks with 4+ clients: how do you keep track of what you promised each one?» · 6 days ago · 61 comments
    +2 more in the report
    Start getting customers for this idea →
  4. 04

    Status page

    Checks your site every 5 minutes and publishes a public page with "all good" or "down".

    Demand: 39/1000 conversations found

    Few conversations yet: it can be a gap or low demand. The report tells you which.

    Start getting customers for this idea →
  5. 05

    Waitlist with referrals

    People join and move up the list when they invite friends with their link.

    Demand: 74/1005 conversations found
    People talking about this right now
    • «My Reddit posts got 3,000+ upvotes. My only paying customer came from a Telegram channel.» · 5 days ago
    • «Launch marketing strateg, affiliate?» · 6 days ago · 17 comments
    +3 more in the report
    Start getting customers for this idea →
  6. 06

    Meeting summaries

    Upload the audio and get the summary and the task list by email.

    Demand: 74/1003 conversations found
    Start getting customers for this idea →
  7. 07

    Public changelog

    Write what is new and it goes out as a page and as an email to your users.

    Demand: 39/1000 conversations found

    Few conversations yet: it can be a gap or low demand. The report tells you which.

    Start getting customers for this idea →
  8. 08

    NPS surveys by email

    Send an email with scores from 0 to 10; one click and it is saved.

    Demand: 59/1001 conversation found
    People talking about this right now
    • «Customer Sat Surveys» · 17 days ago · 19 comments
    Start getting customers for this idea →
  9. 09

    Testimonial wall

    A link where your customers leave a testimonial and a widget to show them on your site.

    Demand: 39/1000 conversations found

    Few conversations yet: it can be a gap or low demand. The report tells you which.

    Start getting customers for this idea →
  10. 10

    Customer finder in forums

    Get an alert when someone in a forum asks for what you sell.

    Demand: 75/1006 conversations found
    People talking about this right now
    • «How do solo technical founders get better at sales?» · 4 days ago · 59 comments
    • «How would you find B2B clients for custom business software?» · 3 days ago · 2 comments
    +4 more in the report
    Start getting customers for this idea →

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