Native · macOS 11+ (Apple Silicon)
Heft opens multi-gigabyte CSV, TSV, and log files in an instant — memory-mapped, never uploaded, native-Rust fast. Search any size for free; filter and export with a license.
The free download runs locked until you activate a license. One-time purchase, perpetual license.
Why
Open files past Excel's ~1M-row limit. Memory-mapped, so multi-gigabyte CSVs and logs open instantly and scroll with zero lag.
Nothing is uploaded — unlike web tools. Your data never leaves your machine: no size caps, no quotas, no waiting.
Built in Rust, not a browser. Open, scroll, and search any file for free; a license unlocks column filters and CSV export.
Pricing
A perpetual license for Heft. Checkout is handled by Paddle, our Merchant of Record, so tax/VAT is included worldwide — and your license key is emailed instantly.