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Faker.js UI
IBANforge
Generates fictitious test data with real validation: Spanish DNI/NIE/CIF, IBAN (ES/DE/FR/PT), test credit cards (Luhn), phone numbers. Seed-based, runs in your browser, free.

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Website, pricing, platforms and company facts side by side.
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| Website | datamockseed.firstflip.es | reactionic.github.io |
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| Company | Startup from Spain · 1 - 9 employees · 2026 | — |
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In their own words, as submitted to SaaSHub.


DataMockSeed is a free, no-signup web tool for generating fake data with correct checksums and control digits: Spanish DNI, NIE, CIF, IBAN (ES/DE/FR/PT with real bank/BIC codes), sandbox credit cards (Luhn algorithm, safe test BIN ranges), phone numbers, and full identities. Unlike asking an LLM,...
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What each product offers, as listed by its team.


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As answered by people managing DataMockSeed.firstflip.es and React-Ionic.
DataMockSeed.firstflip.es's answer
General fakers like Faker.js don't implement Spanish document formats at all, and asking an LLM for a "fake DNI" reliably produces a wrong check digit and a different answer every time. DataMockSeed is free, requires no signup, is reproducible via seed for CI, and ships a validator so you can double-check any value — generated by it or pasted from elsewhere — without sending it to a server.
DataMockSeed.firstflip.es's answer
It generates Spanish identity and banking documents — DNI, NIE, CIF, NSS, IBAN, CCC — with the real control-digit/checksum algorithm behind each one, not just random-looking numbers. Generation is seed-based (same seed + schema = same dataset, always) and runs entirely in the browser, and the same codebase that generates a value also validates it, so the two never drift apart.
DataMockSeed.firstflip.es's answer
QA engineers and manual testers who need realistic Spanish test data, and backend/full-stack developers seeding databases or writing automated tests (via the public REST API) for apps that validate DNI, IBAN or card numbers. Also freelancers and agencies building demos, and anyone learning how these checksum algorithms actually work.
DataMockSeed.firstflip.es's answer
It started from a recurring problem in QA and development work in Spain: test data either used real personal data (a compliance risk), or came from generic tools that don't produce a valid DNI/NIE/CIF/IBAN, breaking any form or API that validates them. DataMockSeed was built to close that gap — deterministic, spec-correct, browser-only generation — and is growing in public, phase by phase (generators first, then an API and docs, now SEO landings per data type).
DataMockSeed.firstflip.es's answer
Next.js (App Router) and TypeScript on Vercel, Tailwind CSS v4 for the UI, a custom seeded PRNG (no Math.random() in any generator, for reproducibility), Vitest for unit tests and Playwright for end-to-end tests, and GitHub Actions for CI/CD.
DataMockSeed.firstflip.es's answer
There isn't a customer list to share — it's a free tool with no sign-up or accounts (yet), so nobody logs in and no usage is tied to a company or name. It's used anonymously by QA teams and developers, either through the web app or the public API in their own test suites.
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