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PromptShield vs MySpec

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

PromptShield compared with MySpec
DetailPromptShield logo PromptShieldMySpec logo MySpec
What it doesStop rewriting prompts. Get better AI answers. AI Senior Architect for Spec-Driven Development that generates 4-file spec bundles before you write code
StageNot given MVP
FoundedNot given Not given
Based inNot given SG
Pricing modelFreemium Freemium
PricingFree: 3 successful optimizations per day, full optimizer quality, no credit card required. Pro: $7.99/month for unlimited successful prompt optimizations. Free: 20 projects, 100 spec files, 20 public share links per month. Pro: 5× AI usage limit, 100 projects, unlimited specs. Team: 10× AI usage limit per seat (2 seats minimum), unlimited projects and specs.
Key features
  • One-click prompt optimization across 7 AI chats
  • Prompt Library and Optimization History
  • Guard feature for sensitive information detection
  • Local image text OCR checking
  • Coach and Personalization
  • Apply without sending functionality
  • 4-file spec bundle generation (constitution, requirements, solution, tasks)
  • Structured interview to clarify scope and edge cases
  • Live Mermaid diagram rendering
  • ZIP export of spec bundle
  • MCP Server integration for IDE agents
  • Greenfield and Brownfield workflow support
  • EARS+ acceptance criteria format
  • Versioned diffs for spec refinement
  • Team collaboration and shared projects
  • Plain-English edits in chat
What makes it different
  • Same high-quality optimizer in both free and paid versions
  • No credit card required for free plan
  • Local data storage for library, history, and personalization
  • Works within existing AI chat interfaces without leaving them
  • Transparent about data handling and privacy
  • Replaces vague prompts with immutable 4-file architectural contracts to prevent AI hallucinations
  • Senior Architect interview catches edge cases before coding begins
  • Supports both Greenfield and Brownfield project workflows
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last check22 no change since last check
Trust Flow (Majestic)911
Citation Flow (Majestic)1927
Referring domains (Majestic)9100

5 details filled in for both companies.

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