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Karolis Masiulis
Flowstep
Graphics engineer @flowstep
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Top 5 Launch
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Maker History
Flowstep
Design & ship real UI
Flowstep 1.0
May 2026
Flowstep
Jun 2025
React spreadsheet import
An open source alternative to Flatfile.
Mar 2022
Ugnis
Visual programming language for web apps
May 2017
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Joined Product Hunt
February 18th, 2017
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Karolis Masiulis
•
9yr ago
Ugnis - Visual programming language for web apps
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Karolis Masiulis
•
4yr ago
React spreadsheet import - CSV/XLSX importer. An open source alternative to Flatfile.
A batteries-included component for importing XLS / XLSX / CSV documents: 📥 Uploader ⚙️ Parser 🧪 Automatic column mapping ✏ Validating and editing data with rules and hooks 🎨 Fully customisable styles and texts
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FlowstepDesign & ship real UI
Flowstep