ActiveQuote will provide life insurance comparison services to customers of uSwitch.
The partnership will allow uSwitch customers to purchase directly online or speak to one of ActiveQuote's staff who can set up the policy for them.
uSwitch customers already receive health insurance comparisons from ActiveQuote.
ActiveQuote was named the fasted growing company in Cardiff in 2014. Its direct-to-consumer service has partnerships with other comparison websites including Gocompare and Confused.com.
Richard Theo, managing director of ActiveQuote, said: "We are proud and excited to be strengthening our relationship with uSwitch.
"Both our companies are focused on saving customers time and money without compromising customer service."
Rod Jones, commercial manager of insurance at uSwitch said: "Life insurance is one of the UK's most purchased insurance products and we are delighted to be working with ActiveQuote who, like us, are fully committed to helping customers find the best policy quickly and buy with confidence."