Promptfoo vs Timmy-TUI: Which is Better in 2026?
Choosing between Promptfoo and Timmy-TUI comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Promptfoo wins this matchup. Our overall AI Agents pick is UiPath. Our free AI Agents pick is Prefactor. Pick Timmy-TUI if you need developer tools.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Promptfoo
Build secure AI applications with AI security testing integrated into your development workflow.
Best for you if:
- • You need security features specifically
- • Integrates AI security testing into CI/CD and development workflows.
- • Automates context-aware attack generation and provides real-time threat intelligence.
Timmy-TUI
Securely record and replay AI agent runs with a local-first flight recorder
Best for you if:
- • You need something completely free
- • You need developer tools features specifically
- • Local-first AI terminal agent with cryptographic receipts for every action the agent takes
- • Streams conversations via OpenRouter with live model swapping and MCP tool-call support
| At a Glance |  Timmy-TUI | |
|---|---|---|
Starts at | FreeFree tier available | FreeFree tier available |
Best For | Security | Developer Tools |
Rating | 4.8/5 | - |
Free plan | Yes | Yes |
Choose Promptfoo or Timmy-TUI?
Choose Promptfoo if
Build secure AI applications with AI security testing integrated into your development workflow.
- LLM eval framework
- Open source
- Good for testing prompts
- Your work is security-shaped, not developer tools-shaped
Choose Timmy-TUI if
Securely record and replay AI agent runs with a local-first flight recorder
- Tamper-evident SHA-256 receipts give a verifiable audit trail of all agent actions, file edits, and tool calls
- Zero external telemetry: all receipts and logs stay on the local machine
- OpenRouter backend means any supported model (leading models, advanced models, etc.) is available without switching tools
- You want a fully free tool (Promptfoo requires payment)
- Your work is developer tools-shaped, not security-shaped
| Feature | Promptfoo | Timmy-TUI |
|---|---|---|
| Pricing Model | Freemium | Free |
| User Rating | ★4.8/5 51 reviews | No ratings yet |
| Categories | SecurityTesting & QA | Developer ToolsAI Agents |
In-Depth Analysis
Promptfoo
Build secure AI applications with AI security testing integrated into your development workflow.
The pricing for Promptfoo is very generous, especially with a robust free tier offering unlimited local evals and all features.
Watch out
No public overage pricing for Cloud
Strengths
- +LLM eval framework
- +Open source
- +Good for testing prompts
- +Active development
- +Good documentation
Weaknesses
- -Learning curve
- -CLI focused
- -Newer tool
- -Limited features
- -Still maturing
Key features
Timmy-TUI
Securely record and replay AI agent runs with a local-first flight recorder
Timmy-TUI offers a fair pricing structure, especially with its generous Free tier.
Watch out
CI/CD minutes and storage overages
Strengths
- +Tamper-evident SHA-256 receipts give a verifiable audit trail of all agent actions, file edits, and tool calls
- +Zero external telemetry: all receipts and logs stay on the local machine
- +OpenRouter backend means any supported model (leading models, advanced models, etc.) is available without switching tools
- +Multiple install paths (npx, global npm, source clone) lower the barrier to a first run
Weaknesses
- -Very early stage with minimal community adoption and limited production hardening
- -Browser companion requires a separate localhost WebSocket server, adding setup friction
- -Documentation is thin beyond the GitHub README, so advanced configuration relies on reading source code
Key features
Pricing: Promptfoo vs Timmy-TUI
| Plan | Promptfoo | Timmy-TUI |
|---|---|---|
| Tier 1 | Free Free | $0 USD per month Free |
| Tier 2 | $50 month Cloud | $4 USD per user/month Team |
| Tier 3 | custom Enterprise | Starting at $21 USD per user/month Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Promptfoo pricing and Timmy-TUI pricing.
Who Should Use What?
On a budget?
Timmy-TUI is free. Promptfoo is freemium.
Go with: Timmy-TUI
Want the highest-rated option?
Promptfoo is rated 4.8/5. Timmy-TUI has no ratings yet.
Go with: Promptfoo
Value user reviews?
Promptfoo: 51 reviews (4.8/5). Timmy-TUI: no ratings yet.
Go with: Promptfoo
3 Questions to Help You Decide
What's your budget?
Promptfoo is freemium. Timmy-TUI is free. Go with Timmy-TUI if free matters most.
What's your use case?
Promptfoo is a security tool. Timmy-TUI is in developer tools. Pick the category that matches your needs.
How important are ratings?
Promptfoo is rated 4.8/5; Timmy-TUI has no ratings yet.
Key Takeaways
Promptfoo
- Free tier available
- Our pick for this comparison
Timmy-TUI
- Completely free
- Better fit for developer tools
The Bottom Line
Promptfoo wins this matchup. Our overall AI Agents pick is UiPath. Our free AI Agents pick is Prefactor. That said, Timmy-TUI is free, hard to beat on price.
Frequently Asked Questions
Is Promptfoo or Timmy-TUI better?
Promptfoo is rated in our evaluation. Promptfoo is freemium and Timmy-TUI is free.
What are Promptfoo and Timmy-TUI used for?
Promptfoo: Build secure AI applications with AI security testing integrated into your development workflow.. Timmy-TUI: Securely record and replay AI agent runs with a local-first flight recorder.
What does Promptfoo cost vs Timmy-TUI?
Promptfoo is freemium (free tier + paid plans). Timmy-TUI is completely free. Visit their websites for detailed pricing.