CertSheet VS Diffee

CertSheet's answer

Your spreadsheet never leaves your device. CertSheet reads the CSV or Excel file and builds every PDF inside your browser, so recipient lists aren't uploaded to anyone's server. You still get what most people need from a certificate tool: one PDF per person named after them, a unique ID and QR code on every certificate, and, on paid plans, hosted verification pages that say whether a certificate is valid or revoked. There's no account to create; paid plans are unlocked with a licence key.

CertSheet's answer

Choose CertSheet if you want certificates done in minutes without signing up, learning a big platform or uploading your attendee list. It's simpler and cheaper than full credentialing platforms: free for up to 20 per batch, US$12 a month for up to 1,000, or a one-time US$19 Event Pass for a single event, with no subscription. Compared with Word mail merge or Canva, it gives you one PDF per person, correctly formatted dates and QR codes without manual work. If you need learner accounts, digital badges or LMS integrations, a full credentialing platform will suit you better.

CertSheet's answer

Small organisations and individuals who issue certificates for their own courses and events: independent trainers and training companies, teachers and schools, workshop, conference and webinar organisers, churches and community groups, and HR or L&D teams handling internal training. Typically they have a spreadsheet of names after an event and need a batch of professional-looking PDFs the same day.

CertSheet's answer

CertSheet started from a familiar chore: a course ends, there's a spreadsheet of names, and someone spends an afternoon in Word mail merge, then splits and renames the PDFs one by one. It's built and run by Stephen Lue-Yen in Kingston, Jamaica, as a focused tool that does that one job well: spreadsheet in, one certificate per person out, with QR verification for issuers who need it. It launched in October 2026.

CertSheet's answer

• TypeScript and React (Vite) for the web app
• pdf-lib and Web Workers to generate PDFs in the browser
• Cloudflare Workers and Cloudflare D1 for verification pages and licence checks
• Polar for payments and licence keys
• Resend for licence key emails
• Playwright for end-to-end tests