Big Board Lab vs FanSpeak On The Clock

Two popular mock draft simulators with very different philosophies. Here's how they stack up for the 2026 draft.

Updated March 30, 2026

Feature	Big Board Lab	FanSpeak
Price	Free — all features	Free tier / Premium for multi-team
Prospects	458 with full scouting reports	Large database
CPU-to-CPU Trades	Yes — 32 AI GMs	No
User-to-CPU Trades	Yes	Yes — Jimmy Johnson chart
Multi-Team Drafting	Yes (free)	Yes (premium)
GM Personalities	32 AI GMs mirroring real GMs	Generic / Team Needs mode
Scheme Fit Scores	Every prospect × every team	No
Live Depth Charts	Yes — formation-style, update with each pick	No
Prospect Profiles	Spider charts, scouting reports, combine + college stats	Consensus ranks + measurables
Custom Big Board	Pair-by-pair Elo + trait sliders	Import or create custom boards
Pick Grading	Letter grades + trade surplus values	Letter grade (value + need)
Draft Sharing	Branded share card images	Shareable results
GM Chat	Ask any GM about their strategy	No
Mobile Support	Full desktop + mobile	Desktop + mobile

Where FanSpeak Wins

The trade calculator is well-executed. It uses the Jimmy Johnson trade value chart — the same system real NFL front offices reference — with clear fairness indicators showing whether a trade is balanced. In Team Needs mode, CPU teams require you to overpay, simulating real negotiation difficulty. This is a mature, proven system.

FanSpeak has a longer track record and a larger established user base. If you've been using On The Clock for years and know the interface, there's value in that familiarity.

FanSpeak's draft grading breaks down into two clear components: value (did you get good value relative to pick position?) and need (how well did you address roster priorities?). Each pick gets its own grade with slide delta and need priority information.

Where Big Board Lab Wins

Simulation realism is the biggest gap. FanSpeak's CPU teams draft competently but generically — there's no meaningful difference between how the Saints, Bengals, or Eagles approach the draft. Big Board Lab features 32 AI GMs, each designed to mirror how its real-world counterpart thinks about the draft. The Cowboys' GM values differently than the Ravens' GM, and you can feel it pick by pick. You can even open Pound the Table — BBL's GM Chat feature — and ask any of the 32 GMs directly about their draft strategy, roster priorities, or how they evaluate specific prospects.

CPU-to-CPU trades change the entire dynamic. In FanSpeak, only you can trade. The rest of the draft unfolds as a static sequence. In Big Board Lab, teams trade with each other throughout the draft, creating the unpredictability of real draft night. When an elite prospect slides, aggressive teams move up — you can't memorize the board the way you can in a trade-less simulation. And with user-to-CPU trades live as well, you can initiate your own moves to trade up or trade back.

Both simulators offer multi-team drafting, but Big Board Lab includes it for free. FanSpeak requires a premium subscription. In Big Board Lab, you can control any combination of teams in the same draft, with the remaining teams run by their respective AI GMs — so the picks you don't control still feel realistic.

The prospect evaluation tools go much deeper. Every one of Big Board Lab's 458 prospects has a full scouting report with strengths and weaknesses, spider charts showing position-specific trait grades, and scheme fit scores for all 32 teams. You can compare up to four prospects side by side with combo charts that show exactly where each player has an edge. The Combine Explorer lets you stack any player's athletic testing against 26 years of NFL Combine history at their position, and college stats are ranked against 10 years of FBS production data with dominator ratings and breakout year analysis. FanSpeak shows you consensus ranks and measurables — Big Board Lab shows you why a player fits or doesn't.

Scout Vision lets you toggle any team's scheme-fit lens onto the entire board, instantly re-sorting prospects by how well they fit a specific system. Scarcity maps show where positional depth runs thin in the class, so you can see when it's time to pull the trigger on a position before the talent dries up.

Live formation-style depth charts update with every pick in the draft, showing you exactly where a rookie projects on the roster. Instead of just seeing "Team X needs CB," you see who's at CB1 and CB2 and whether a drafted corner is an immediate starter or a developmental pick. Free agency impact tracking with contract details keeps the depth charts current through the offseason.

Team Insights pages for all 32 teams give you the full picture before you draft — roster strengths, scheme details, draft capital, and positional needs. The R1 Monte Carlo prediction simulator runs 500 iterations to show you the most likely first-round outcomes, so you can plan for different board scenarios.

Big Board Lab's trait slider system lets you evaluate prospects at a granular level — adjusting position-specific attributes like arm strength, burst, and coverage instincts to build your own grades. FanSpeak supports custom big boards but doesn't offer trait-based evaluation. And after your draft, you get letter grades with trade surplus values for every pick, plus a branded share card you can post anywhere. Community ADP from user drafts shows you how the crowd is drafting, and adjustable simulation speed lets you control the pace.

The Verdict

If you want a proven user-to-CPU trade system with the Jimmy Johnson chart and a familiar interface you've used for years, FanSpeak is a solid choice. If you want a simulation that feels more like real draft night — with 32 AI GMs that mirror real front offices, teams trading around you, free multi-team drafting, scheme fit scores shaping every pick, 458 fully scouted prospects with up to four-player comparisons, and every pick showing its impact on a live depth chart — Big Board Lab delivers all of that, and it's completely free on desktop and mobile.