Stop fighting AI.
Start thinking clearly.
Prompt Doctor diagnoses the thinking flaws behind weak prompts, rewrites them at a higher level, and coaches you to reason like a strategist — not a search-engine user.
Free forever for basic analysis. No card required.
A second brain for your prompts
Diagnose flaws
Find the missing context, vague verbs and untested assumptions in any prompt.
Rewrite at a higher level
Get a tightened, structured prompt with clear roles, constraints and success criteria.
Learn the thinking
Each analysis ends with a short lesson — so next time you write the better prompt yourself.
How it works
Tap a step to jump to it.
Diagnosis
We scan your prompt for missing context, vague verbs, untested assumptions and structural gaps.
Why it failed
A clear breakdown of the thinking errors behind the prompt — so the fix isn't just cosmetic.
Rewrite
A tightened, structured rewrite with explicit roles, constraints and success criteria.
Coaching
A short lesson on the reasoning move you missed — so next time you write the better prompt yourself.
Simple, transparent pricing
Start free. Upgrade when thinking better starts paying off.
Free
Get started
£0
- 10 basic diagnoses / day
- 10 prompt generations / day
- Low tier model — GPT-5-nano / Gemini Flash-Lite
- Save prompts & notes
Pro
For power users
£15£10.50/mo for 3 months
Then £15/month. Launch offer — 30% off auto-applied.
- Everything in Free
- 30 basic diagnoses / day
- 30 prompt generations / day with richer examples
- Mid tier — GPT-5-mini / Gemini 2.5 Flash
- Pro Academy — 4 modules, 10 lessons
- Notes system with tags
- Shareable analysis links
- Cancel anytime — no lock-in
Premium
For serious creators & consultants
£25£17.50/mo for 3 months
Then £25/month. Launch offer — 30% off auto-applied.
- Everything in Pro
- Unlimited daily diagnoses & prompt generations
- Expert-grade Generate — multi-shot examples, CoT, evaluation rubrics
- High tier — GPT-5 / Gemini 2.5 Pro priority routing
- Deep diagnosis — multi-pass with critique loop
- Custom AI personas & saved brand voices
- Voice transcription in 50+ languages
- Image → prompt extraction (OCR + vision)
- Premium Academy — 6 extra modules, 16 lessons
- Marketplace: 50% lower selling fees
- Priority email support (24h SLA)
Learn to prompt like a pro
10 modules · 28 lessons. Self-paced, opinionated, built from what actually works in production. Browse the full curriculum below — sign in with Pro to start learning.
1 · Foundations of Prompting
Build the mental model behind every great prompt.
- 8 minHow LLMs actually read your promptTokens, attention and why word order matters more than you think.
- 6 minSpecificity beats clevernessWhy concrete nouns, numbers and examples outperform 'be creative'.
2 · Core Techniques
The patterns pros reach for again and again.
- 10 minFew-shot promptingTeach the model your style with 2–5 worked examples.
- 9 minChain-of-thought & step-by-stepForce the model to think before it speaks.
- 7 minRole and persona promptingGive the model a job title and a point of view.
3 · Advanced Workflows
Multi-step prompting, evals and production-grade patterns.
- 12 minPrompt chainingBreak one impossible prompt into three easy ones.
- 8 minSelf-critique and rewritingMake the model grade and improve its own output.
- 11 minEvaluating your promptsStop guessing. Build a tiny eval set and measure.
4 · Shipping to Production
Reliability, cost and safety for prompts that real users hit.
- 9 minGuardrails and refusalsStop the model going off-script under adversarial input.
- 7 minCost and latency tuningSmaller models, shorter prompts, cached preambles.
5 · Premium · Production AI Systems
Architect multi-agent, multi-model pipelines that ship.
- 18 minMulti-agent orchestrationPlanner, executor, critic — three agents that beat one.
- 14 minCost-aware model routingRoute each request to the cheapest model that can do the job.
- 16 minRAG that actually worksWhy most RAG demos break in production and how to fix them.
- 12 minStructured output at scaleJSON schema, tool calls, surviving the model's bad days.
6 · Premium · Prompting as a Business
Turn your prompting skill into a deliverable, product, or contract.
- 15 minPackaging prompts as productsFrom a clever prompt to something a stranger will pay for.
- 20 minSelling AI workflows to clientsScope, quote and deliver a prompt-engineering engagement.
- 13 minBuilding evaluation suites for clientsThe artefact that makes you irreplaceable.
7 · Premium · Persona Engineering
Design custom AI personas that sound unmistakably like a brand or a person.
- 14 minCapturing a voice fingerprintReduce a voice to 12 measurable style traits.
- 11 minStacking personas for nuanceCombine role × mood × constraint to escape generic output.
- 9 minSafe impersonation & legal linesWhere 'in the style of' ends and trademark trouble begins.
8 · Premium · Multimodal & Voice Pipelines
Prompts that read images, watch screens and talk back.
- 13 minImage → prompt extractionTurn a screenshot, sketch or photo into a structured prompt.
- 12 minVoice-first prompt flowsPrompts designed for spoken input — no markdown, no lists.
9 · Premium · Safety, Privacy & Compliance
Ship prompts that survive lawyers, auditors and adversarial users.
- 11 minPII redaction at the prompt boundaryStrip personal data before it ever reaches the model.
- 14 minAdversarial prompt testingRed-team your own prompts before users do.
- 10 minAudit trails & explainabilityProve what the model said, why, and from what source.
10 · Premium · Automation & Integrations
Wire prompts into the tools that actually run your business.
- 12 minWebhook-triggered promptsTurn any event into a prompt run.
- 10 minScheduled batch promptingRun thousands of prompts overnight — cheaply and reliably.
- 15 minTool use & function callingLet the model call your APIs — safely.