Connect your Yahoo, Sleeper or ESPN league in seconds and Flex tells you who to start, who to drop and which trades to make.
Flex Fantasy is your AI-powered fantasy football co-pilot. Connect your Sleeper, ESPN or Yahoo league and get instant analysis built for YOUR league, not generic rankings.
WHAT FLEX DOES
AI Team Rating: See exactly how your roster stacks up against the league-optimal team for the rest of the season, in one 0-100 score.
Start/Sit Calls: Clear start or sit calls on every borderline player, every week, with the projected point swing and the case for each move: matchup, efficiency and the latest news.
Ask Flex Who to Start: Torn between players? Pick 2 to 4 for a spot and Flex makes the call, with the research behind it.
Waiver Wire Intelligence: Know which available players actually upgrade your team, ranked by real impact, with what each pickup does to your lineup week by week.
Trade Co-Pilot: AI-analyzed trade ideas tuned to your roster's needs, with the reasoning behind every deal. Or build your own around the player you want to add, drop or trade.
Bye Week Planner: See which byes hurt your lineup, who covers them, and the pickups worth making.
Matchup Breakdown: Win probability, your biggest edges, and positional gaps for the week at a glance. Real scores replace projections as each game finishes.
BUILT FOR YOUR LEAGUE
Flex reads your actual roster, scoring settings, and league setup. Projections are rebuilt and scored for your league, so every recommendation is specific to your team and your matchups, never one-size-fits-all advice.
WORKS WITH YOUR PLATFORM
Sync in seconds with Sleeper, ESPN and Yahoo. No manual entry, no spreadsheets. This application uses fantasy data provided by Yahoo Fantasy.
FREE AND PRO
Flex is free to use with all your leagues from one connected platform, plus the full My Team page, including your team rating, projected record, playoff odds, position breakdown and AI start/sit calls. Flex Pro unlocks Ask Flex who to start, waiver intelligence, the trade co-pilot, the full Players board and every platform.
Get your season sorted. Download Flex Fantasy and start winning smarter.
SUBSCRIPTION DETAILS
Flex Pro is an auto-renewing annual subscription. The price is shown in the app before you buy. Payment is charged to your Apple ID account at confirmation of purchase. The subscription renews automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel your subscription in your Apple ID account settings after purchase.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://www.flexfantasy.ai/privacy
Thanks so much for your review. We're so pleased you're loving Flex!
Poor execution, False advertising
mr bigglesworth
As others have said, the app does not work with yahoo when its marketing suggests it does. In fact, it only works with espn and sleeper. The Developer’s response to other reviews regarding this is “it’ll be fixed very soon”. When is very soon? Share your roadmap with your subscribers, commit to a date, and UPDATE YOUR MARKETING to reflect reality so you aren’t misleading people. The app is poor in other ways too. Start/sit and waiver suggestions aren’t insightful. Recommendations are basically “Start player A over player B because they have a higher ceiling and are projected to score more fantasy points”. No in depth analysis of each player’s matchup or anything like that. Just “we think they’ll score more points”. Also, it doesn’t actually synch or live update. The first game of the season just happened last night and the app is still suggesting that I sit players who have already played. The players’ scores in Flex still show projections even though they have already played. Flex also won’t “push” start/sit decisions to your fantasy platform. If flex suggests you start player A and sit player B, you still have to go into your fantasy league platform, make the changes, and then go back into flex to tell it whether or not you did so.The AI that drives the analysis is weak, (probably just scraping data from other subscription platforms and presenting it as their own) and functionality is very limited. Clearly somebody just used AI agents to rapidly build an app and rush it to market before the season started with a teaser $.99 founder subscription. Its not even worth that and its not worth your time if you value your time at all.If the developer’s response to this review is similar to those that were published before mine, you’ll know that their AI customer service agent is as poorly trained as the ones used to build the app and run the marketing.
Developer Response
Hi, thanks for the detailed feedback. We appreciate you taking the time to lay it all out.Good news first: Yahoo is now fully supported. Not updating our members on the ongoing status was an oversight on our part and we're sorry for the frustration it caused before it was fixed. It's no longer an issue.On the analysis depth, there's more here than the first recommendation card shows. Tapping AI Analysis, then "Go Deeper," surfaces more of the reasoning behind each start/sit call. We're also working on adding DVOA-based analysis to strengthen this further, and this will be coming soon.The projections issue you flagged is fixed and scores now update to actual results once a game has been played, instead of continuing to show projections. If you're still seeing that on the latest version, let us know and we'll look into it.With regards to not automatically pushing start/sit decisions to your fantasy platform, that's accurate, and it's a deliberate choice rather than an oversight. We understand why that extra step is frustrating, and it's something we're considering for the future.We'd welcome any further specifics on where the suggestions feel like they're missing depth as that kind of detail really helps us prioritize. Feel free to reach out anytime here: https://scoreline.freshdesk.com/support/home
Completely ignores roster context; worthless trade and waiver advice
Thirddavey
This app is just a basic ranking list with an AI label slapped on it. It gives generic waiver and trade suggestions without looking at your actual team structure. For example, it told me to pick up a third quarterback off waivers simply because they were the highest-rated player available, ignoring the fact that my QB position was already fully set.The AI lacks real-time awareness, positional logic, and basic league context. Even at $0.99 it's not worth it, and if it cost any more, it would be a total waste of money. Stick to free tools like Sleeper or FantasyPros instead.
Developer Response
Hi Davey, thanks for taking the time to leave us a review. We'd really like to hear more about your experience and gain more feedback. Please contact flex.support@scoreline.ai and we can put you in touch with the Flex team. Thanks!
False Advertising
QuantumIdiot
App screenshots, Facebook ad, and website all state integration with Yahoo. However, this is not true as it is unavailable, in addition to a long list of unavailable options, when setting up the app. With the NFL season starting very soon this is disappointing to discover after already paying the founder fee.
Developer Response
Hi Nukerton. We're just finalising things with Yahoo and it will be available very soon. Apologies for the delay.
Flex 2.0 is here, rebuilt around what you told us.
Smarter projections: rankings now land where you'd expect, scored for your league.
AI analysis on every move: each start/sit, waiver and trade suggestion shows why, what it does to your lineup and the latest news.
Ask Flex who to start: pick 2 to 4 players and get the call with the research behind it.
Build your own moves around the player you want to add, drop or trade.
Bye week planner: see which byes hurt and who covers them.
Version 2.0.0
The developer, Fantasy Football Hub Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
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The following data may be collected and linked to your identity:
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Data Not Linked to You
The following data may be collected but it is not linked to your identity:
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Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Fantasy Football Hub Ltd
Size
66.2 MB
Category
Sports
Compatibility
Requires iOS 15.1 or later.
iPhone Requires iOS 15.1 or later.
iPod touch Requires iOS 15.1 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.