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fieldtwin
Jobber and QuickBooks APIs on your laptop, for safe testing
Twins of the Jobber and QuickBooks Online APIs that run locally, with a fake trades business in both. Make the APIs fail on demand, skip time, and see exactly what your code or AI agent changed, then undo it. Free and open source.
Hi Product Hunt, I'm Nick. I build integrations and AI agents for small service businesses, and testing them has always meant choosing between a client's live books, an empty vendor sandbox, or mocks that only return what you expected.
fieldtwin is what I wanted instead. It runs the Jobber and QuickBooks Online APIs on your laptop, backed by a believable fake business that lives in both systems at once. Your code changes one URL and works against it as it would against the real thing.
Then you can make it hard: throttle QuickBooks, lose the answer to a write, send a webhook twice, jump the clock past every token's expiry. Afterwards, get the exact list of what your code or agent changed, and rewind it.
It's modeled from the vendors' public docs, and FIDELITY.md says how closely, behavior by behavior. It's free, Apache 2.0, and not affiliated with Jobber or Intuit.
I'd love to know which system you'd want twinned next.
About fieldtwin on Product Hunt
“Jobber and QuickBooks APIs on your laptop, for safe testing”
fieldtwin was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #195 on the daily leaderboard. Twins of the Jobber and QuickBooks Online APIs that run locally, with a fake trades business in both. Make the APIs fail on demand, skip time, and see exactly what your code or AI agent changed, then undo it. Free and open source.
On the analytics side, fieldtwin 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 fieldtwin performed against the three products that launched closest to it on the same day.
Who hunted fieldtwin?
fieldtwin was hunted by Nick George AI. 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 fieldtwin including community comment highlights and product details, visit the product overview.
Nick George AI