Images or rows
Open a folder of images or a CSV of data and classify each item in sequence.
Local-first dataset triage
Ask questions. Classify fast. Move on.
DeckCheck is a tiny source-available desktop app for turning folders of images and CSV rows into clean classified datasets, one keyboard shortcut at a time.
birds-2026.deckcheck
Question 1 of 1
Sharp enough for the field guide?
Try it: press 1
Folder or CSV
← → to move
Auto-resume
This preview is live: number keys answer, arrow keys change the photo.
Built for one job
Rapid human judgement, captured cleanly.
Your questions
Define the multiple-choice questions you actually need, one or many per item.
Keyboard-first flow
Answer with 1–9, move with arrows, export with ⌘E. Mistakes are one keypress back.
Resumes where you left off
Everything lives in one .deckcheck file. Stop mid-run, reopen later, carry on.
No platform ceremony
Not an annotation suite. Not an AI pipeline.
DeckCheck is for the small, sharp classification jobs that should not require servers, accounts, Docker, bounding boxes, collaboration layers, or enterprise workflow. Open data, answer structured questions, export the result as CSV.
Free, source available
Download DeckCheck
Releases ship with SHA-256 checksums. Or build it yourself: instructions on GitHub.