The TSP issued a warning earlier today about third-party apps, particularly ones that request TSP account information. While a TSP app could eventually be developed perhaps as early as this year, TSP has yet to launch one.
The TSP warning reads:
Warning: Third-Party Mobile Applications — There are a number of mobile applications that reference the Thrift Savings Plan and may prompt you for your TSP account credentials. These applications are NOT sponsored by the TSP. The TSP cannot endorse any information or advice provided by third-party applications. More important, providing your TSP account credentials to third-party applications may jeopardize the security of your account.
For more information on keeping your account safe, see the Security Center on the TSP website or contact the ThriftLine at 1-TSP-YOU-FRST (1-877-968-3778).