The Best Free AI Tools You're Not Using

500+ Tools, All Free, No Signup Required

The Coherence Daddy free tools hub runs 500+ browser-based utilities — no account, no API key, no data leaving your device. Most people find one or two tools and never explore the rest. This post highlights the ten most useful ones that consistently get overlooked.

1. Token Counter

Before you send a massive prompt to GPT-4o or Claude, do you know how many tokens it is? The Token Counter estimates token counts for major LLMs including GPT-4, Claude 3, and Gemini. Paste your prompt, system message, or document and immediately see token count, estimated cost per call, and how it fits within different models' context windows.

This is essential for anyone building prompts that include large documents or long conversation histories. Finding out a prompt is over the context limit at runtime is a painful way to debug.

2. JWT Decoder

The JWT Decoder decodes JSON Web Tokens entirely in your browser — the token never leaves your machine. Paste any JWT and immediately see the header, payload, and expiration in a readable format. This is useful for debugging auth flows, verifying what claims your API is actually issuing, and quickly checking if a token is expired.

Unlike online JWT tools that may log your tokens server-side, this one is purely client-side. For anything involving real auth tokens, that distinction matters.

3. Prompt Diff

When you're iterating on a prompt, it's easy to lose track of what actually changed between versions. The Prompt Diff tool shows a side-by-side diff of two prompt versions with highlighted additions and deletions — like git diff, but for prompts.

This is particularly valuable for team settings where multiple people are working on the same prompt, or for keeping a record of what changes improved or degraded output quality in your evaluations.

4. Cron Builder

Cron expressions are notorious for being difficult to read and write correctly. The Cron Builder gives you a visual editor — set the schedule with dropdowns and checkboxes, and see the resulting cron expression plus the next ten scheduled run times displayed clearly.

It works the other way too: paste an existing cron expression and it parses it into human-readable English and shows you when it will next fire. No more "is 0 */6 * * * every 6 hours or every 6 minutes?" confusion.

5. Agent Comparison

If you're evaluating AI agent platforms, the Agent Comparison tool gives you a structured side-by-side view of the major players — LangGraph, AutoGen, CrewAI, OpenAI Assistants, and others. Filter by features, compare tool-use capabilities, memory support, and deployment models.

It's a faster starting point than reading six different documentation sites and trying to keep the comparisons in your head.

6. Readiness Assessment

The AI Readiness Assessment is a structured questionnaire that evaluates your organization's current state across six dimensions: data infrastructure, team capability, process automation maturity, governance, tooling, and executive support. It produces a scored report with specific recommendations.

This is useful for two situations: convincing leadership that AI investment is justified (the output is structured and shareable), and identifying where to focus your next quarter of preparation.

7. Hash Generator

The Hash Generator produces MD5, SHA-1, SHA-256, and SHA-512 hashes in your browser. Useful for verifying file integrity, generating checksums for content-addressed storage, or quickly creating a deterministic identifier for a piece of data.

The SHA-256 output is particularly useful for anyone working with blockchain systems where hash-based addressing is fundamental.

8. API Status Monitor

The API Status tool checks whether major AI and crypto APIs are currently reachable — OpenAI, Anthropic, CoinGecko, Etherscan, and others. When your application is behaving unexpectedly, the first question is usually "is it my code or is the upstream API down?" This gives you a quick answer without leaving your browser.

9. Stack Builder

The AI Stack Builder is an interactive tool for designing an AI agent technology stack. Select your requirements across dimensions — model provider, orchestration layer, memory backend, vector store, deployment target — and it produces a coherent architecture recommendation with rationale.

It's less useful for experienced ML engineers who already know what they want, but valuable for teams new to the space who need to understand how the pieces fit together before they start building.

10. Wallet Analyzer

The Wallet Analyzer validates address formats for Ethereum, Cosmos SDK chains, and Bitcoin, and analyzes wallet address patterns. For anyone working across multiple chains, keeping the address format conventions straight is error-prone. Paste an address and immediately see if it's valid for the chain you intend, plus any pattern analysis.

Everything Runs Locally

All 500+ tools run entirely in your browser. No accounts, no API keys, no server-side processing of your data. The tools that do make external API calls (Crypto Sentiment, Meme Coin Tracker, Trending Now) use cached data through our proxy to protect your IP address and reduce rate limiting. Everything else — the formatters, calculators, generators, decoders — processes data purely client-side.

Browse the full catalog at freetools.coherencedaddy.com.