ParlayGrade | Parlay Building & Grading Tool

ParlayGrade was brought to me by the senior director of product at Bookies.com, a Grandstand and Gambling.com Group brand. The goal was to replace the site's existing picks feature: player and team suggestions written by pundits, with no statistical backing behind them.

The brief called for a data rich product that let bettors quickly understand trends from a player or team's recent performance, so they could build parlays from informed decisions rather than opinion. It also had to be mobile first from day one.

I audited comparable products in the space, including Covers, BettingPros and Rotowire, to see how existing tools handled prop data and grading. Most leaned on either raw stats tables or simple picks with no visible reasoning behind them.

To close that gap, I designed a letter grade system for each prop, backed by an on-demand tooltip explaining the logic behind the grade. The aim was for a bettor to trust and act on a grade in seconds, without needing to interpret the underlying statistics themselves.

The main browsing view paired a single prop in detailed view with the remaining props shown in a compact list. Experienced users could scan the compact cards alone and have enough to decide, while anyone wanting more depth could open a prop into full detail without leaving the list.

Selected picks populated a persistent bet slip, showing the parlay's combined grade and a link out to the best cumulative odds across sportsbooks.

Since bettors were expected to build and check parlays on the move, the bet slip pattern had to work as well on a phone as on desktop. On mobile it lived at the bottom of the screen like a collapsible nav bar, so users could expand it to review picks or exit to a sportsbook without losing their place in the prop list.

ParlayGrade shipped in full. The entire flow, from browsing graded props to building and grading a parlay to exiting through to a sportsbook, was live and in use by real bettors.

Its reach stayed limited by where it lived: the product sat behind a banner routing to a sub-URL rather than Bookies.com's main navigation, a placement shaped by the brand's affiliate business model rather than by product strategy. It was later discontinued following a change in brand leadership and a resulting shift in direction, unrelated to the product's design or performance.