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Promptiff
Compare AI output against every prompt you gave it
Promptiff helps you review AI-written documents against the original instructions. Select one or more prompt turns and an output, inspect sentence-level matches, and find possible omissions or additions. Switch between semantic, word, Git-style, and character views. The open-source CLI, canvas, and Agent Skill run locally; remote embeddings are optional and require an explicit choice.
Hey Product Hunt, I’m Branton, the maker of Promptiff. I kept finding that a polished AI draft could quietly drop a requirement from an earlier prompt or add something no one asked for. Promptiff puts the prompts and chosen output side by side so you can inspect those changes sentence by sentence. The default comparison stays local; semantic matching can use a local model, and remote inference is opt-in. It's open source, with a CLI and Skill for Agent workflows. I'd love feedback on how you review AI-generated documents and which comparison view helps you most. Similarity scores are clues, not a verdict.
About Promptiff on Product Hunt
“Compare AI output against every prompt you gave it”
Promptiff was submitted on Product Hunt and earned 2 upvotes and 2 comments, placing #129 on the daily leaderboard. Promptiff helps you review AI-written documents against the original instructions. Select one or more prompt turns and an output, inspect sentence-level matches, and find possible omissions or additions. Switch between semantic, word, Git-style, and character views. The open-source CLI, canvas, and Agent Skill run locally; remote embeddings are optional and require an explicit choice.
On the analytics side, Promptiff competes within Open Source, Developer Tools, Artificial Intelligence and GitHub — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how Promptiff performed against the three products that launched closest to it on the same day.
Who hunted Promptiff?
Promptiff was hunted by Branton Liu. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Promptiff including community comment highlights and product details, visit the product overview.
Branton Liu