Playback – Interactive Programming and Print Debugging Reimagined
Ladies and gentlemen of a Lisp persuasion, Clojurians and Clojuristas, followers of the paren and everyone else covetously eyeing the greener grass, I made an open-source thing that I would like to share with you. My elevator pitch is that it'll make you forget all about regular print debugging in 10 minutes straight. The slightly longer pitch is this: #>(tag'n'trace any Clojure(-Script) form to `tap>` and Portal with automatic last-input function replay on eval, instant re-render and hassle-free insertion of traced data into the REPL) And before I end up pasting half the README here in bits…
In plain words
Playback is an open-source debugging tool for Clojure and ClojureScript that replaces traditional print debugging. It tags and traces code forms, sending them to tap> and Portal for visualization. The tool automatically replays functions on evaluation, instantly re-renders results, and integrates traced data directly into the REPL. It's designed for Clojure developers seeking more interactive and efficient debugging workflows.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Ladies and gentlemen of a Lisp persuasion, Clojurians and Clojuristas, followers of the paren and everyone else covetously eyeing the greener grass, I made an open-source thing that I would like to share with you. My elevator pitch is that it'll make you forget all about regular print debugging in 10 minutes straight. The slightly longer pitch is this: #>(tag'n'trace any Clojure(-Script) form to `tap>` and Portal with automatic last-input function replay on eval, instant re-render and hassle-free insertion of traced data into the REPL) And before I end up pasting half the README here in bits and pieces, just go and check out the damn thing, will ya. There's a screencast and everything. https://github.com/gnl/playback
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