Less-sheet
A minimal but fast CSV viewer
Details
- External ID
- 49565406
- Source
- HN
- Company
- —
- Product
- Less-sheet
- Website domain
- github.io
- Launched
- Sept. 4, 2026
- Cohort
- —
- Upvotes
- 5
- Upvotes percentile
- 0.12998405103668262
- Tags
- —
- Fetched at
- Sept. 10, 2026, 5:31 a.m.
- Updated at
- Sept. 10, 2026, 5:31 a.m.
Description
Built this tool for my self, as a quick way to open CSV files of, almost, any size. Supports also gzipped csvs and can load directly over http(s)
Enrichment
- Theme
- niche developer utilities and toolchains
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Hobby / open-source project
- Normalized one-liner
- csv viewer for developers
- Manually corrected
- False
Could you build this?
Partial A standard web or desktop CSV viewer is simple, but instantly loading multi-gigabyte or gzipped CSV files over HTTP without running out of memory requires custom high-performance streaming and virtualization.
What it would actually take: The architecture typically uses Rust (compiled to WebAssembly or native) or C/Go with memory-mapped files (mmap) or byte-range HTTP requests. The hard part is chunk-based indexing, fast SIMD-accelerated CSV parsing, decompression on the fly, and infinite-scroll virtual table rendering without freezing the main thread. Implementing this requires low-level systems programming and high-performance streaming parser expertise.
Discussion
2 comments analyzed.
Competitors mentioned: Visidata, macOS Preview, Excel
Concerns raised: Large file memory usage when entire file loaded in background, Limited to preview/viewing rather than data manipulation
Feature requests: More advanced data working capabilities beyond viewing, Additional column formatting options beyond hide/type/basic formatting
Competitors
Other products that read as similar to this one — 128 launches clear the similarity bar, closest 8 shown.
Attention rank: #116 of 129 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 271 days after the earliest competitor.
- CSV Viewer Online · ph · 2026-09-09 · 1 upvotes · similarity 0.54
- CSV Viewer & Editor Online: View & Edit · ph · 2026-09-20 · 1 upvotes · similarity 0.54
- I built an "ilovepdf" for CSV files (and I called it ILoveCSV) · hn · 2025-12-29 · 5 upvotes · similarity 0.52
- CSVTools · ph · 2026-09-30 · 2 upvotes · similarity 0.48
- SheetToCsv · ph · 2026-09-29 · 1 upvotes · similarity 0.47
- Plotiq · hn · 2026-03-15 · 7 upvotes · similarity 0.46
- CSV & JSON Developer Tools · ph · 2026-09-29 · 1 upvotes · similarity 0.46
- JSON Viewer · ph · 2026-09-10 · 2 upvotes · similarity 0.45
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.