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Back in April (when it also acquired BodyMedia), Jawbone announced an invitation-only API program for its UP activity-tracking wristband. On Thursday, the company said it was opening up API access to developers worldwide.

“The open UP Developer Platform includes everything a developer will need including full documentation of the API, the ability to set up and manage connected apps, and access to support/troubleshooting from the developer community and Jawbone engineers,” the company said in a statement, adding that it plans to roll out additional features in the next few months.

At its initial launch, Jawbone only gave API access to 10 partners, including MapMyFitness, RunKeeper, Withings and IFTTT. It enabled a startup like RunKeeper, for example, to let users log a run in that app and then view the data in UP’s app or use a Withings scale and then monitor their weight through UP.

Competitors Fitbit (see disclosure) and the Nike(s nke) Fuelband also offer developers access to APIs (although it appears that Nike’s is available to select developers). Given strong competition from those wearable rivals, as well as activity-tracking mobile apps, Jawbone’s hope is that an open API will help it expand the UP ecosystem.

Earlier this month, Jawbone said that it had raised more than $100 million (through debt and equity financing) to keep up with demand for wearable technology.

Disclosure: Fitbit is backed by True Ventures, a venture capital firm that is an investor in the parent company of this blog, Giga Omni Media. Om Malik, founder of Giga Omni Media, is also a venture partner at True.