---
title: "Is This BS? — Daily Rebuttal Practice"
description: "Spot the weak claim, build your rebuttal, hold your ground, and replay it stronger. Daily argument practice and claim checking with Professor Dave Explains."
canonical: "https://www.builtbyfoundry.io/is-this-bs"
language: "en"
representation: "text/markdown"
---

![Is This BS app icon](https://www.builtbyfoundry.io/_next/image?url=%2Fimages%2Fapp-icons%2Fisthisbs-512x512.png&w=96&q=75)Is This BS?

[Download](https://www.builtbyfoundry.io/get/is-this-bs)

![Professor Dave](https://www.builtbyfoundry.io/_next/image?url=%2Fimages%2Favatar-professordave.jpeg&w=64&q=75)Built with Professor Dave Explains

# Say the right thing  
when it matters.

Spot the weak claim. Build the rebuttal. Hold your ground. Then replay it stronger with daily practice built with Professor Dave Explains.

[Download on theApp Store](https://www.builtbyfoundry.io/get/is-this-bs)

★★★★★Free every day · iPhone & iPad

TRUEMISLEADINGFALSE![Is This BS analyzing a claim, showing Dave's Take and a line-by-line claim dissection](https://www.builtbyfoundry.io/_next/image?url=%2Fimages%2Fscreenshot-isthisbs.png&w=750&q=75)

4.19M

YouTube subscribers

480M+

Total views

11M+

Views on his top debunk

1 / day

Free rebuttal rep

How it works

## One rep from frozen to ready.

One short loop trains the whole response: detect, rebut, defend, replay. Start with a daily scenario or a claim you just checked.

1

### Spot the weak move

Name the fallacy or evidence gap before you answer. The claim checker can turn something you found into a practice rep.

2

### Build the rebuttal

Write the response you wish you had in the moment. Your coach points to one win, one leak, and a stronger version.

3

### Hold your ground

Answer the pushback, then replay your line in your own words. Three reps unlock a weekly boss and a clear before-and-after.

The verdict

## Not just true or false.

Real claims are messier than that. Every analysis names exactly what's solid, what's slippery, and what's simply wrong.

TRUE

The claim holds up. The evidence is sound and the reasoning is honest, and you get the receipts to prove it.

MISLEADING

Technically true, deliberately framed to fool you. This is where most misinformation lives, and where the app shines.

FALSE

It falls apart under scrutiny. See exactly which parts are wrong and the real science that replaces them.

Learn the tricks

## Spot the fallacy every time.

Ad HominemStraw ManAppeal to AuthorityFalse DichotomyCherry PickingSlippery SlopeRed HerringCorrelation ≠ CausationAppeal to Nature

Premium unlocks the full fallacy library with plain-English examples, explanations, and real-world case studies pulled from the wild.

![Professor Dave Explains](https://www.builtbyfoundry.io/_next/image?url=%2Fimages%2Favatar-professordave.jpeg&w=640&q=75)

Built from Professor Dave's decade of teaching science and challenging pseudoscience: evidence first, name the weak move, and answer the argument that was actually made.

Professor Dave Explains

Science communicator & author · 4.19M subscribers

## Have the words next time.

One full rebuttal rep and one claim check stay free each day. Download Is This BS? and turn the next bad argument into practice.

[Download on theApp Store](https://www.builtbyfoundry.io/get/is-this-bs)

[Privacy](https://www.builtbyfoundry.io/is-this-bs/privacy.md)[Terms](https://www.builtbyfoundry.io/is-this-bs/terms.md)[Support](https://www.builtbyfoundry.io/is-this-bs/support.md)[YouTube](https://www.youtube.com/@ProfessorDaveExplains)[Contact](mailto:support@builtbyfoundry.io)

With Professor Dave Explains