The Ledger

Every statement that passed quotation and attribution checks. Mix any filter with any other: certainty 1/5, debate potential 5/5, or both at once.

clear all ✕

why aren't all 82 resolved? a statement only gets an assessment when the public record can support or contradict it. opinions and what-ifs never can, and 0 checkable ones are still open, waiting for their date. predictions held up or didn't; assertions are supported or contradicted. on every card: ▮▮▮▮▮ certainty · ▮▮▮▮▮ debate potential. speakers are clickable

Assertion Contradicted
Paul Graham: Viaweb was likely the first web application
“Ok, so, what we made was something that is now called a web app. I believe, at the time it was the first one, and, ah, that's why the company was called ViaWeb, because it worked via the web.”
Paul Graham Sep 1, 2018 ▶ 2:13 A Conversation with Paul Graham - Moderated by Geoff Ralston · Y Combinator
Assertion Contradicted
New Story and ICON built the first 3D printer for remote regions
“Our printer that we've designed is a printer that's ready to work in some of the most remote areas in the world, some of the You know, most difficult to work places in the world which is the first of its kind.”
Alexandria Lafci Apr 4, 2018 ▶ 42:37 3D Home Printing for the Developing World – Alexandria Lafci and Brett Hagler of New Story Charity · Y Combinator
Prediction Didn’t hold up
Bromberg: Startup liquidity timelines will revert to moving faster again
“Certainly in the last few years we've seen, ah, the speed to liquidity go down, ah, we think that's gonna revert back and we're gonna see that, that come faster again.”
Andy Bromberg Mar 9, 2018 ▶ 7:30 Andy Bromberg - Startup Investor School Day 4 · Y Combinator
Assertion Contradicted
Bromberg: ICOs raise $10M to $200M via SAFTs
“Token fundraising ICOs, mostly raised on what are called SAFTS, Simple Agreements for Future Tokens... Mostly raised from hedge funds, venture funds, institutions, and again, angels putting money into these ICOs. But they're raising 10 to two hundred million d…”
Andy Bromberg Mar 9, 2018 ▶ 29:22 Andy Bromberg - Startup Investor School Day 4 · Y Combinator
Assertion Contradicted
Slavin: Academic Tenure Arose Under McCarthyism to Protect Free Thought
“Tenure, which there's, there are very good reasons for tenure, and it arose under McCarthyism to protect free thought essentially, which is great.”
Kevin Slavin Dec 6, 2017 ▶ 1:48 There's an Art to Getting Brilliant People to Surprise Themselves - Kevin Slavin of The Shed · Y Combinator
Assertion Contradicted
Iorns: Diet research shows strong responses only in small subgroups
“All of the research that's been done on diet and dietary interventions, if you actually look at the clinical data, it suggests that There's a subgroup of people that respond to that dietary intervention very well, but the vast majority don't really at all, and…”
Elizabeth Iorns Sep 13, 2017 ▶ 38:28 Elizabeth Iorns on Biotech Companies in YC · Y Combinator
Assertion Contradicted
Zaremba: Robots cannot grasp arbitrary objects without custom hand-coded programming
“So it turns out that when it comes to arbitrary objects current robots are unable to just grasp an arbitrary object. For any object, it's possible to hand-code a single solution, so, say, as long as, let's say, in factory, if you have same object like I don't …”
Wojciech Zaremba May 17, 2017 ▶ 3:12 An AI Primer with Wojciech Zaremba · Y Combinator
Assertion Contradicted
Bartram: 80% of software engineers lack side projects to show
“The reason it's the right decision is that most engineers don't have side projects. Most engineers have been, have, you know, been working at a company, and it's all proprietary code, and there's very little they can show. That's, you know, eight out of 10 eng…”
Ammon Bartram May 17, 2017 ▶ 24:23 Hiring Engineers with Ammon Bartram · Y Combinator
Assertion Contradicted
Zuckerberg: Entire Facebook management team left within a year of rejecting Yahoo offer
“The whole management team was gone within within about a year after that.”
Mark Zuckerberg Aug 16, 2016 ▶ 8:18 Mark Zuckerberg : How to Build the Future · Y Combinator
Assertion Contradicted
PostHog had the most upvoted Hacker News dev tool launch of 2020
“I pull up the post hoc slide every now and then, and I believe according to the slide, and I think it's true, it was the most upvoted dev tool hacker news post of the year.”
Brad Flora Dec 10, 2025 ▶ 12:25 From Pivot Hell To $1.4 Billion Unicorn · Y Combinator
Assertion Contradicted
Pollak: Global stablecoin supply is near $200 billion
“There's almost two hundred billion dollars of stablecoins in the market”
Jesse Pollak Sep 23, 2025 ▶ 13:56 Why Now Is The Best Time To Build In Crypto · Y Combinator
Assertion Contradicted
Englander: YC W24 was the first batch almost entirely composed of AI
“That really was, that was like the first batch where it was like through and through, just, you know, AI companies pretty much”
Chas Englander Jul 31, 2025 ▶ 41:41 The Finance Startup Bringing Agentic AI to Wall Street · Y Combinator
Assertion Contradicted
Vercel replaces click UI instructions with cURL commands for AI agents
“Bursell, for example, is replacing every occurrence of click with the equivalent curl command that your LLM agent could take on your behalf.”
Andrej Karpathy Jun 19, 2025 ▶ 36:09 Andrej Karpathy: Software Is Changing (Again) · Y Combinator
Assertion Contradicted
Palicha: Zepto Raised India's Only Unicorn Round in 2023
“Because it was like the only unicorn round in India for that year.”
Aadit Palicha Apr 18, 2025 ▶ 17:51 How Zepto Became India’s Fastest Growing Startup · Y Combinator
Assertion Contradicted
Dessaigne: PostHog's sales leader is also the company's CTO
“Did you know the team, the CTO, is also their sales leader? Not a business leader. Their sales leader is also the CTO.”
Nicolas Dessaigne Nov 26, 2024 ▶ 22:43 How To Start A Dev Tools Company | Startup School · Y Combinator
Assertion Contradicted
Koomen: Optimizely started as manual A/B testing consulting before building software
“We actually had this example at Optimizely where we were building software to help companies run A-B tests. But at the earliest stages, we got companies to pay us just to go in and manually build A-B tests. For them. Right. And so we're making money. The first…”
Pete Koomen May 30, 2024 ▶ 23:38 Startup Experts Discuss Doing Things That Don't Scale · Y Combinator
Assertion Contradicted
Saez-Gil: Carbon market capital flow is growing 50% year-over-year
“The flow of capital going to carbon markets is growing. 50% year over year since the Paris Agreement.”
Diego Saez-Gil Jan 28, 2020 ▶ 17:07 Diego Saez Gil - How Pachama Uses Tech to Solve Climate Change · Y Combinator
Assertion Contradicted
Hu: Niantic's employee headcount grew at least 5x year-over-year
“I mean, we, when we joined the company, I mean, from last year to this year, it's like at least five X. It's crazy.”
Diana Hu Aug 28, 2019 ▶ 23:19 Diana Hu on Augmented Reality and Building a Startup in a New Market · Y Combinator
Assertion Contradicted
Alströmer: Airbnb founders posed as hired photographers to hide small team size
“They claimed to be hired photographers for Airbnb, Airbnb and breakfast. So when they met with all the hosts, they said, we want to come by your home and take photos. They didn't say that they were the founders because that made the company sound much smaller.”
Gustaf Alströmer Aug 15, 2019 ▶ 5:45 Gustaf Alströmer - Growth for Startups · Y Combinator
Assertion Contradicted
Halligan: HubSpot Maintained $250/Month Pricing for First Six Years
“HubSpot was 250 dollars a month for The first like six years of HubSpot, we didn't change it at all.”
Brian Halligan May 8, 2019 ▶ 8:48 HubSpot CEO and Cofounder Brian Halligan with Wufoo Cofounder Kevin Hale · Y Combinator
Assertion Contradicted
Allred: Lambda School's student body is less than 50% white
“So we're, I think as a school, we're less than half white, which is not the traditional makeup of a code school by any stretch of the imagination.”
Austen Allred Apr 3, 2019 ▶ 36:37 A CS Education That's Free Until You Get a Job - Austen Allred of Lambda School · Y Combinator
Assertion Contradicted
Sophisticated bots use natural language technology to reply in comment threads
“Some of the more sophisticated bots might actually interact with real people so they blend, like, chatbot bot technology and, you know, we all have been to those customer service pages where the thing pops up at the bottom and says, hi, can I help you today? T…”
Samantha Bradshaw Jan 23, 2019 ▶ 1:54 Tracking Political Manipulation Through Social Media - Samantha Bradshaw · Y Combinator
Assertion Contradicted
Iorns: Amgen's Migraine Drug Outperformed Market Predictions by 10x
“Actually, Amgen's migraine drug has outperformed its predictions in the market by 10 times”
Elizabeth Iorns Oct 3, 2018 ▶ 40:37 A Conversation with Elizabeth Iorns - Advice for Biotech Founders · Y Combinator
Assertion Contradicted
Schwartz: Ranking on Baidu requires local Chinese web hosting
“In order to rank on Baidu, you actually need Chinese hosting.”
Eli Schwartz Sep 27, 2018 ▶ 37:37 SEO Advice from SurveyMonkey Director of SEO and Growth, Eli Schwartz · Y Combinator
Assertion Contradicted
Petersen: Air Freight Is on Average 5x More Expensive Than Ocean Freight
“Air freight on average, about five times more expensive than ocean freight.”
Ryan Petersen Aug 30, 2018 ▶ 37:17 Ryan Petersen on Building Flexport, a Modern Freight Forwarder · Y Combinator
Assertion Contradicted
Petersen: The largest global freight forwarder has only 2% market share
“Now, the largest in the world only has two percent market share.”
Ryan Petersen Aug 30, 2018 ▶ 45:08 Ryan Petersen on Building Flexport, a Modern Freight Forwarder · Y Combinator
Assertion Contradicted
Bromberg: Startup seed rounds crested $1M for the first time around 2010
“In 2010 after the recession more angels, more seed funds investing smaller and smaller amounts. At the same time, we saw seed rounds crest a million dollars for the first time”
Andy Bromberg Mar 9, 2018 ▶ 20:27 Andy Bromberg - Startup Investor School Day 4 · Y Combinator
Assertion Contradicted
Bernstam: Modern seed rounds exceed Dropbox and Airbnb's Series A rounds
“The seed rounds today, Are bigger than, like, the Series A that Dropbox and Airbnb did with Sequoia, which I think was roughly a mil each.”
Tikhon Bernstam Sep 8, 2017 ▶ 6:16 The Challenges a Repeat Founder Faces - Tikhon Bernstam · Y Combinator
Assertion Contradicted
Atherton: Forerunner Ventures led Zyper's $4M seed pre-Demo Day
“Forerunner Ventures led our seed pre-demo day, and that was exciting. So we raised four million then”
Amber Atherton Dec 18, 2019 ▶ 4:24 Amber Atherton of Zyper and Iba Masood of TARA on Raising a Series A as a Female Founder · Y Combinator
Assertion Contradicted
Allred: His growth hacking book Kickstarter generated $120,000 in sales
“And I emailed everybody who had subscribed to my blog and said, alright, we're launching this Kickstarter, and I'm gonna finish up this book, and the Kickstarter did something like a 120,000 dollars in sales.”
Austen Allred Apr 3, 2019 ▶ 22:03 A CS Education That's Free Until You Get a Job - Austen Allred of Lambda School · Y Combinator
Assertion Contradicted
Cheung: Y Combinator has backed hundreds of biotech companies by 2018
“She's also a part-time partner at YC, which means in her free time, she helps all our biotech companies at which, at this point it's like hundreds, I don't know what the exact number is, but hundreds of biotech companies.”
Adora Cheung Oct 3, 2018 ▶ 0:54 A Conversation with Elizabeth Iorns - Advice for Biotech Founders · Y Combinator
Assertion Contradicted
Wessel: WayUp raised $9 million before hiring its first VP
“At that time, we'd only raised nine million dollars, which is still, I know, it sounds like a lot, but that's not enough to ensure that you are going to be You know, around for years and years to come.”
Liz Wessel May 31, 2018 ▶ 31:37 Advice for Students and Recent Graduates on Finding Jobs – Liz Wessel of WayUp · Y Combinator
Assertion Contradicted
Cannon: Spike Jonze rejected technical advisors on 'Her' to avoid reality constraints
“And Spike Jones explicitly said, we don't want a technical advisor because I don't want to be bounded by reality. I just want to go for it.”
Craig Cannon Nov 29, 2017 ▶ 8:07 Microbes, Robots, and Ambition - Robin Sloan on His Novel Sourdough · Y Combinator
Assertion Contradicted
Emily Weiss: Beauty is YouTube's second-largest category after tech unboxing
“Really, YouTube, you know, it's like the number one or two category after, like, tech unboxing, or unboxing of other things, which I didn't know.”
Emily Weiss Jul 26, 2017 ▶ 8:01 Emily Weiss on the Insights That Grew Glossier - With Amy Buechler at the Female Founders Conference · Y Combinator
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