Grimly.
The prompt engineering workbench for developers who ship AI features.
From $14.99
The problem
Prompt engineering is trial and error by default. Developers write prompts inline, forget what they tested, can't compare outputs between versions, and have no structured way to manage prompt changes across a codebase.
How it works
Grimly. is a dedicated workbench for writing, testing, versioning, and comparing prompts. It treats prompts as first-class artifacts, not strings buried in application code.
Screenshots coming soon.
Who it's for
Backend and full-stack developers building AI-powered features who ship more than one prompt and need to iterate without losing track of what worked.
What you get
Prompts are versioned, testable, and comparable. You know why a prompt works, not just that it does.
$14.99 · one-time
- Revenue Forecast
- ASO Optimizer
- Pricing Strategist
- Competitor Research
- Pitch Deck Architect
- All future À La Carte tools included
Or buy individual tools
Final sale. No refunds. Grimly. Full Bundle is not eligible for partial refunds. See Refund Policy for details. View Refund Policy.
Pricing
Grimly. is a one-time purchase. The Full Bundle is $14.99 and includes all five tools. Each tool is also available separately at $5.99. A free version is available on GitHub with basic functionality.
Common questions
- What is the difference between the Full Bundle and À La Carte?
- The Full Bundle includes all five tools and all future À La Carte additions at one price. À La Carte lets you buy only the specific tool you need. If you use more than three tools, the Bundle is cheaper.
- Is there a free version?
- Yes. A free version with basic prompt editing is available on GitHub. The paid tools add versioning, test harness, variable injection, and response diffing.
- Is this a subscription?
- No. Grimly. is a one-time purchase. You pay once and own it. Updates within the current major version are included.