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PrxmptStudix
Available for Windows only!
The Professional
Prompt Engineering Studio
Craft, test, and optimize LLM interactions with precision and scale. Go beyond basic chat interfaces and treat prompts like code.
Native Integration with Industry Leaders
Core Capabilities
Everything you need to ensure your AI integrations are reliable, cost-effective, and high-performing.
Version Control for AI
Centralized repository for tags, history diffing, and variable injection using {{variable_name}} syntax.
Scientific Experimentation
Combinatorial testing with Selector and Rater evaluation across local and cloud AI models.
Check DocumentationData Management
Manage thousands of test cases, reusable profiles, and deep business contexts for bulk processing.
Check DocumentationInside the Workspace
A glimpse into the professional prompt engineering experience.
Dataset Engine
Evaluation Suite
Practical AI
Engineering Tasks.
See exactly how PrxmptStudix's core tools—Experiments, Library, Selector, and Rater—solve everyday production bottlenecks.
A/B Testing Hooks
Test 5 variations of an ad hook across GPT-4o and Claude simultaneously to find the highest converting copy before you hit publish.
Cost Benchmarking
Run a data-extraction prompt across 10 different models to find the cheapest API that mathematically still returns 100% valid JSON.
Automated Regressions
Updating your core system prompt? Automatically run it against 500 edge-case inputs to ensure your new logic didn't break existing behavior.
Mass Variable Injection
Inject a CSV of 1,000 CRM contacts directly into a single "cold email" prompt template to generate personalized outreach at massive scale.
Autonomous Scoring
Deploy dedicated AI Rater agents to mathematically score prompt outputs 1-5 based on your strict brand guidelines and logical accuracy.
Forced-Choice Eval
Set up a Selector experiment to present the AI with multiple options (e.g., 5 headline variations) and force it to choose the one that best fits a specific Persona.
Personal Organization
Build a structured, easily accessible local library of your best-performing system prompts. Tag and categorize them for instant retrieval.
Test-Proven Templates
Stop losing your winning configurations. Save the exact prompts that achieved top C-L-Q scores during experiments directly to your personal library.
Advanced Evaluation Methods
PrxmptStudix goes beyond "vibes" by offering multiple scientific ways to measure success.
Forced-Choice
Selector Experiments
The gold standard for preference testing. Uses systematic multi-pass algorithms to generate ordered permutations and detects position bias.
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Position Bias Detection
Rotates option order ([A,B] vs [B,A]) to find if a model favors first or last items.
Leaderboard Tracking
Automatically identifies which items from your source are consistently chosen.
Qualitative Assessment
Rater Experiments
Use high-capability models to act as a "Judge" for your outputs. Define numeric ranges or qualitative labels.
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Custom Grading Scales
Define numeric ranges or map specific scoring guidelines to your rater.
Performance Reports
Visualize score distributions, histograms, and average ratings to benchmark quality.
Objective Validation
Programmatic Rules
Define code-based, deterministic criteria that determine a "Pass" or "Fail" status with absolute certainty.
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Exact Match Constraints
Verify specific strings or tokens are present.
Regex Validation
Validate complex patterns like email formats or markdown structures.
JSON Schema Compliance
Ensure outputs conform to strict programmatic data structures.
Length & Lexical Overlap
Control verbosity and ensure presence of specific keywords.
Adopt a Data-Driven Workflow
1
Define Variables
Create Datasets and Profiles to represent the breadth of your real production use cases. Don't just hardcode data.
2
Experiment & Evaluate
Use the Lab to find the "Sweet Spot". Combine models with Raters or Selectors to simulate human judgment, then verify with programmatic rules.
3
Run Locally or on Cloud
Run entirely local for maximum privacy, or connect directly to major cloud AI providers via API integration.
Development Philosophy
PrxmptStudix is built on a foundation of user empowerment, privacy, and long-term utility.
Local-First Design
Privacy by default. Your prompts, variables, results, and API keys are stored securely on your local machine. They never touch our servers.
You Own the Software
PrxmptStudix is a tool, not a service. One-time payment, no recurring subscriptions, and no remote kill-switches. It is yours to keep.
Full Portability
Standard local storage makes it easy to migrate. Exportable results. Swap between OpenAI, Anthropic, Gemini, or local models instantly.
Cost Transparency
Zero API markup. Direct service costs to providers. No artificial token caps enforced by our software. Uncapped power that scales with you.
Community Focused
Engineered for Everyone.
The studio isn't just a tool; it's a bridge. We've distilled years of prompt engineering expertise into a beautiful, zero-code interface that feels like magic.
0%
Learning Curve
10x
Productivity
100%
Data Privacy
∞
Possibilities
Simple, Transparent Pricing
You own the software. No recurring subscriptions. No API taxes.
Essential
Essential tools to build and organize your prompts.
$149
Save 35%
$97
lifetime
- Prompt Library: 6K+ built-in prompts, 45+ datasets, 130+ personas, 250+ business profiles
- Version Control & History Tracking
- Unlimited Variables & Templates
- Custom tag and category management
- Local Profile & Dataset Storage
THE COMPLETE WORKSPACE
The Ultimate Studio
Library, Lab Experiments, plus our suite of AI Workflows.
$249
Save 41%
$147
lifetime
- Everything in Professional
- Workflows: 10+ built-in, ready-to-run automation pipelines
- Automate repetitive evaluation tasks
- View all included workflows
Professional
Add scientific testing and experiment analytics.
$199
Save 36%
$127
lifetime
- Everything in Essential
- Lab: 20+ built-in testing & evaluation experiments
- Selector (Forced-Choice)
- Rater (Qualitative Evaluation)
- Programatic rules (Regex, Schema matches)
- Real-time Multi-Model cost comparisons
Usually replies in < 2 hours
The Studio is
Always Open.
No gatekeeping, no automated forms. Connect directly with the engineers behind PrxmptStudix for priority inquiries, partnerships, or enterprise pilots.
Human Responses
Direct Inquiry Channel
Priority Delivery
Initiate Handshake
Frequently Asked Questions
Everything you need to know about PrxmptStudix.
What is PrxmptStudix?
PrxmptStudix is a professional Desktop application designed specifically for Prompt Engineering. It allows you to treat prompts like modular code, enabling batch testing, multi-model evaluation, and highly organized persona management.
Is it really local-first?
Yes. 100%. All your datasets, project files, and prompt libraries are stored exclusively on your machine. We do not host your data, and we do not have a "cloud sync" as we believe prompt engineering requires absolute data sovereignty.
Do I need my own API keys?
Yes. PrxmptStudix is a professional client. You provide your own keys for OpenAI, Anthropic, Gemini, etc. This ensures you pay the direct provider costs with zero markup from us.
Is there a monthly subscription?
No. We offer perpetual licenses. Pay once, own it forever. It's software for developers, the way it used to be.
Does PrxmptStudix support local LLMs like Ollama?
Absolutely. You can connect to any OpenAI-compatible API, including Ollama, LM Studio, or your own self-hosted inference servers. This ensures your workflow remains truly private and cost-effective.
Can I run large-scale batch evaluations?
Yes. The Lab module is built for scale. You can run hundreds of test cases across multiple model variations simultaneously with high-concurrency controls and real-time visualization of performance metrics.
How does the variable injection system work?
PrxmptStudix uses a modular templating engine. You can define global variables, project-specific datasets, and dynamic placeholders that are injected into your prompts at runtime, allowing for complex persona and data-driven testing.
Is it possible to export project data for CI/CD?
Yes. You can export your libraries, evaluation results, and versioned prompts in JSON, CSV, or Markdown. This allow you to integrate prompt versioning directly into your existing development pipelines and Git repositories.