PromptLayer

✓ verified, sync 2026-08-20

14 checks on record, most recent 2026-10-31 (responded).

PricingFreemium

Rating2.0 on Toolify

Category Prompt EngineeringLarge Language Models (LLMs)AI MonitorAI Developer ToolsAI AgentAI Testing +4

First indexed2026-08-20

Observation record.

What was checked ourselves, with dates. Not vendor copy, not a rating.

Address confidence: low. The URL on file may not be PromptLayer's own domain (for example a marketplace or parked host). The dates below describe checks against that URL; the link between that URL and PromptLayer itself is not confirmed.

Most recent check 2026-10-31

Result: responded.

Checked on 14 distinct dates, since 2026-09-02. Checked roughly every 4.5 nights on this listing's own record.

2026-10-312026-10-272026-10-262026-10-242026-10-212026-10-202026-10-142026-10-082026-10-022026-09-262026-09-252026-09-20 +2

What this means: the 3-miss rule marks a listing discontinued only after three consecutive failed checks; a bot-wall response never counts toward that streak. the methodology

Price events.

auto-diffed on every sync: the changelog other directories don't keep

The price was checked on 2026-09-25 and no change was observed since.

No approved price events on record

No approved price change is on record.

Features

As listed by the vendor, unedited.

Prompt management
Prompt evaluations
LLM observability
Team collaboration
Version control for prompts
A/B testing of prompts
Prompt Registry
Historical backtests

What it does.

The vendor's own description, unedited, not our claim.

PromptLayer is a platform designed to track and manage GPT prompt engineering. It acts as middleware between your code and OpenAI's Python library, recording all OpenAI API requests. This allows users to search and explore request history in the PromptLayer dashboard. It provides tools for prompt management, evaluation, LLM observability, team collaboration, and improving prompt quality.

registry ID ndock:tool:promptlayer

More prompt engineering tools.

Learn Prompting Learn Prompting is a free, open-source course on communicating with artificial intelligence. It is the largest and most comprehensive course in prompt engineering available on the internet, with over 60 content modules, translated into 9 languages, and a thriving community. It offers AI courses, live courses, and certification exams to help learners master AI and prompt engineering.