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You are a few minutes away from analyzing any text for logical fallacies, cognitive biases, manipulation tactics, and more.
TellDear maps the full landscape of flawed reasoning: 535 aspects across 6 dimensions — logical fallacies, cognitive biases, manipulation tactics, statistical errors, argumentation schemes, and discourse mechanics.
You can paste any text and get an instant AI analysis. But TellDear is just as much a place to explore and get curious. Browse the taxonomy and stumble onto concepts you've never heard of. Quiz yourself with the Fallacy Trainer. Follow the Knowledge Graph and discover how manipulation, bias, and logic interlock. Use it as a reference, a training ground, or simply a source of inspiration — whatever draws you in.
6 dimensions · 535 aspects
Seventeen apps, each built for a specific analysis task. All require an API key.
Sign up at the Login page. You will receive a confirmation email — click the link to activate your account.
TellDear supports many AI providers — including Anthropic, OpenAI, Google, Mistral, DeepSeek, Groq, xAI, and OpenRouter. Add your own API key to keep costs under your control and usage private. The provider is auto-detected from your key.
sk-ant-, OpenAI with sk-, Gemini with AIzaSy.
Go to your Account page, paste the key into the API Key field, and save. TellDear encrypts it at rest — it is never shared or logged.
Each provider has a sensible default model. On your Account page you can switch to a different model — for example Haiku (faster, cheaper) or Opus (most capable) for Anthropic, or the equivalent tiers for OpenAI and Gemini.
These are the most common and accessible reasoning patterns — the ones you'll encounter every day. Learn these first.
Ableist language uses disability-related terms as metaphors for negative qualities, thereby reinf…
A rhetorical pattern that combines urgency ('We must act NOW!') with vagueness about what that ac…
Ad hominem attacks the person making an argument rather than the argument itself. It comes in sev…
The affect heuristic is a mental shortcut in which people make judgments and decisions based on t…
The anecdotal argument fallacy occurs when personal experiences, individual stories, or isolated …
Anecdotal Evidence uses individual stories, personal experiences, or isolated cases as proof for …
Appeal to (false) authority occurs when someone cites an authority figure to support a claim, but…
Appeal to emotion is a manipulation technique where an argument bypasses rational analysis by tar…
The appeal to fear uses threats, fear-mongering, or alarming scenarios to persuade, rather than p…
The appeal to flattery uses compliments, ego-stroking, or false praise to make someone more recep…
TellDear is free — no subscription, no ads.
API costs are billed directly by your provider, not through TellDear. Free-mode usage has no cost.
Typical cost per analysis: $0.01–0.05. A $5 monthly limit covers hundreds of analyses.
Set a spending limit at console.anthropic.com to stay in control.
Your API key is encrypted at rest and used only to relay your own API requests. It is never stored in plain text, logged, or shared.
Text you submit is sent to your chosen AI provider's API for processing. TellDear does not store analysis results or input text beyond the current session.