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16x Prompt

Free

Cross-platform app to add source code and formatting instructions into prompt for coding tasks. ($)

FreeFree tier
Starting Price
$48/mo
Type
Open Source
Visit Website GitHub (40 stars)

About 16x Prompt

16x Prompt is a desktop application that helps developers manage source code context and craft optimized prompts for complex coding tasks on existing codebases. It bridges the gap between AI coding assistants (like GitHub Copilot) and fully autonomous AI agents, offering a semi-automated workflow with human-in-the-loop. Key capabilities include code editing with visual diffs and automatic backups, prompt context management, custom instructions for different tech stacks, workspace organization for multiple repositories, API integrations with providers like OpenAI, Anthropic, Google Gemini, and DeepSeek, token limit tracking, and the ability to compare LLM responses side-by-side. The app works locally to ensure data privacy and can output the final prompt for copying into any LLM interface or sending directly via API. It offers a free version with limitations and a lifetime license for unlimited usage.

Key Features

Code editing with visual diffs and automatic backups
Prompt context management (drag and drop files)
Custom instructions for different tech stacks (Next.js, Python, SQL, etc.)
Workspace organization for multiple repositories and projects
API integrations with OpenAI, Anthropic, Google Gemini, DeepSeek, OpenRouter, Ollama, Azure OpenAI, and more
Token limit tracking to keep prompts within LLM limits
Compare LLM responses side-by-side when using API
Formatting instructions automatically added to prompts
Local data privacy – works without internet connection
Copy final prompt or send via API (bring your own key)

Pros & Cons

Pros
  • Free version available with core features (10 prompts/day limit)
  • Lifetime license at $48 one-time fee (no recurring subscription)
  • Works with any LLM – no vendor lock-in
  • Local data processing – no external data storage
  • Visual diffs and automatic backups for safe code edits
  • Supports many API providers including local models via Ollama
  • Allows side-by-side comparison of different models
  • Self-service license management
Cons
  • Free version limited to 10 prompts per day
  • No refunds on license purchases
  • No built-in API keys – users must bring their own
  • Individual license does not include invoice (only team license)
  • No VAT number for EU users (team invoices include UEN instead)
  • Requires manual context selection – not fully automated

Best For

Complex coding tasks across multiple files (5-8 story points)Refactoring existing codebasesCreating new pages or componentsWriting documentationManaging multiple repositories in a single workspaceComparing AI model outputs for code generationCoding with privacy-sensitive local dataComplementing GitHub Copilot and Cursor for harder problems

FAQ

Is 16x Prompt free?
Yes, 16x Prompt is free to download and use, but the free version is limited to 10 prompts per day. A lifetime license is available to remove this limitation.
Do you offer refunds?
No, 16x Prompt does not offer refunds due to costs associated with Stripe. The user is encouraged to try the free version before purchasing a license.
Does 16x Prompt come with an OpenAI API key?
No, 16x Prompt does not include any API keys. Users need to have their own OpenAI API key to use the OpenAI integration feature.
Can I get an invoice for my purchase?
Invoices are only available for the Life-time License (Team). The Life-time License (Individual) does not include an invoice.
How many devices can I use a license on?
Individual licenses can be activated on up to 3 devices. Team licenses can be activated on up to 10 devices. Self-service deactivation is supported since version 0.0.59.