Prompt Assay
6.7#10 in prompt management softwareFrom $49 a monthFree planWebAPI
VisitPrompt Assay vs Vellum
What both publish
| Fact | Prompt Assay | Vellum |
|---|---|---|
| Product | Prompt Assay is a workbench for authoring, refining, versioning, testing, and shipping LLM prompts and Agent Skills. | Vellum describes itself as a personal AI assistant that can read files, manage calendars, send email, run code, and control a computer. |
Prompt Assay plans
- Solo$49 a month
- Team$99 a month
- Free—
- EnterprisePriced on request
Vellum plans
- BaseFree
- FreeFree
- Mighty$30 a month
- Mighty$30 a month
- Custom$50 a month
- Super$100 a month
Pick Prompt Assay if…
Prompt Assay suits prompt engineers and teams sharing prompt libraries, as well as researchers comparing models and developers retrieving prompts through an API or SDK. It is useful for users who want to manage prompts and Agent Skills through versioning, testing, and evaluation.
Pick Vellum if…
Vellum suits individuals seeking an assistant for files, calendars, email, code, and computer tasks. It is characterized as a personal assistant rather than a team or shared company tool.