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Reviewed matches are labeled. Other suggestions come from a shared subcategory, use case, source listing or the same category. Compare features and current plans before choosing.

Product
Helicone LLM Observability for Developers
Spanlens Open source LLM observability and monitoring
Deadpipe LLM observability
Llm Stats I built the LLM Comparison Tool I wish existed
Infere Platform for LLM observability, evaluators and git-like prompt management.
Narrow AI Automated Prompt Engineering and Optimization
promptctl CLI for prompt engineering and LLM cost optimization
Rexxard Rexxard is an AI prompt engineering platform with five tools to write, enhance, debug, compare, score, and learn prompts for ChatGPT, Claude, Gemini and all other LLM models.

Selected by category and available use-case details. A topic match does not establish equivalent features.

Product
AIStupidLevel Live AI benchmarks, drift alerts, and smart model routing
Observyze Real-time LLM observability & guardrails — 100% free
Prompt Optimizer Prompt Optimizer — Free AI Prompt Engineering and Refiner
Prompt Mastery Learn prompt engineering by solving 10 AI puzzles
PromptLayer The collaboration layer for AI engineering teams
NovaPrompt NovaPrompt is an platfom to manage an write better ai prompt

Added to this directory in the past 30 days. Dates refer to the directory listing, not the product launch.

Product
CollabPrompts AI Prompt Management for Teams
H Hotdogbenchmark Hot. Dog. Bench. Mark. The AI benchmark we deserve
A ARF a record format for AI evaluation runs, with reproducible digests
F Freeaipromptgen Free AI Prompt Gen – A local-first, open-source prompt engineering tool

Profiles grouped by topic. This does not confirm an offer, availability or a connection to this profile.

Profile
dragosr Autonomous Carbon Based LLM with 42 years of tuning on Information Attack and Defense.
johnSonder.bsky.social A Cabbage of a Man.
John Berryman LLM consulting @ https://arcturus-labs.com/

Shows and channels grouped by topic. A recommendation does not mean this profile was featured or endorsed.

Show
Exploring Language Models Newsletter · Maarten Grootendorst
The Art of the Realizable Newsletter · Maxim Raginsky
Molecular Modeling Club Newsletter · Chaitanya K. Joshi

Retold founder accounts from startups in the same category, each linked to the original.

Story
Wade Foster charged $100 after building the integration a forum asked for Wade Foster says Zapier's first paying customer was Mixergy's Andrew Warner, billed $100 into an unfinished beta after Wade found a stale PayPal-to-Highrise plea and then shipped Wufoo-to-AWeber instead, taking the money
Chatbase's college founder published a $64,000 MRR ladder, not a yearly run-rate Yasser Elsaid told Indie Hackers that Chatbase, started as ChatGPT for PDFs, reached $64,000 monthly recurring revenue by 13 May 2023 after a viral tweet, with most cash on a $399 plan.
FounderPal sold strategies as one-time payments, not subscriptions Sveta Bay says Marketing Strategy Generator brought around $10,000 a month in one-time payments after a second MVP earned $60,000 in six months. Dan Kulkov later said that paid product made around $100,000 in ten months.
Prompt Genie shipped on a Friday and called 30 days five figures, not MRR Kushank Aggarwal says a Carrd-and-PickAxe ChatGPT prompt generator went from idea to first paid user in four days and to five-figure revenue in 30 days via organic TikTok and Instagram, then slowed with wrapper-like chur

Subcategories in the same part of the directory, with the number of listed products.