EIDOSTACK FEATURES

All the tools you need to work with AI models in one Playground

Chat with AI models from different providers, compare responses, experiment with prompts, and manage context — all in one workspace.

Get Started for FreeView Pricing

No installation required. Connect your API key and get started.

More than a regular AI chat

EidoStack combines a familiar AI chat interface with tools for exploring model capabilities in greater depth.

Choose models from different providers, send requests, compare results, and experiment with settings.

View token usage, the cost of every request, and context window consumption as you work.

One Playground for chatting, experimenting, and analyzing AI models.

01 / MODEL COMPARISON

Compare AI models in one interface

Different AI models can respond to the same request in different ways. With EidoStack, you don't need to open multiple tabs, switch between provider platforms, or manually copy prompts. Send one request to several supported models and compare their responses side by side.

One prompt. Multiple models. Clear comparisons.

Explore how different models handle the same task, follow instructions, and generate responses. Alongside the results, view the token usage and estimated cost of each request.

  • Compare responses side by side. Send the same prompt to selected models and explore the results in one interface.
  • Explore model behavior. Discover differences in response quality, style, detail, and instruction following.
  • Analyze costs. Compare token usage and the estimated cost of each response.
  • Work across providers. Use supported OpenAI, Anthropic, and Google models with your own API keys.
Learn More About Model Comparison

02 / PROMPTS & CONTEXT

Experiment with prompts and manage context

How you phrase a request and what information you provide to a model affects its responses. EidoStack lets you configure system prompts, change context strategies, and explore AI model behavior under different conditions. Experiment with instructions, control conversation history, and analyze context window usage.

Customize model behavior for your tasks

Set your own system instructions, choose how conversation history is passed to the model, and track how many tokens are used to build the context.

  • System prompts. Define the model's role, response style, output format, and behavior rules.
  • Context strategies. Choose prompt-only or system-prompt-only requests, full history, recent messages, or semantic retrieval through RAG.
  • Context window visualization. Track how much of the available context is occupied by system instructions and conversation history.
  • Experiment with settings. Test how changes to prompts and context affect responses from different models.

Control not only what you ask, but also what information the AI receives.

03 / TOKENS & COST

Track tokens and the cost of every AI request

Different AI models have different usage costs. Even identical requests can consume different numbers of tokens. EidoStack displays usage metrics alongside model responses, helping you better understand the cost of every experiment. View statistics for individual requests, chats, models, and providers.

Full visibility into AI costs

Instead of constantly checking separate provider dashboards, analyze token usage and estimated request costs in one place.

  • Input tokens. See how many tokens are sent to the model with your prompt, system instructions, and context.
  • Output tokens. View the number of tokens the model used to generate a response.
  • Request costs. Estimate the cost of each AI model request.
  • Cost comparison. Discover how the cost of completing the same task varies across models.
  • Usage statistics. Analyze token usage and costs by model, provider, and time period.
  • Cost history. Track how your AI model usage changes over time.

Experiment with different models without losing control of costs.

04 / WORKSPACE

All your AI chats and experiments in one place

Working with AI rarely ends with a single request. You try different prompts, switch between models, continue conversations, and return to previous results. EidoStack saves your chat history and helps you organize experiments in a convenient workspace.

Work with AI without losing context or results

Create separate chats for different tasks, group them into folders, and return to previous conversations whenever you need to.

  • Chat history. Save requests, model responses, and their associated usage metrics.
  • Folders. Organize conversations by project, task, provider, or area of work.
  • Automatic titles. Find conversations faster with automatically generated chat titles.
  • Continue conversations. Return to existing chats and keep interacting with AI.
  • Experiment history. Review past prompts, results, and request costs.

Your Playground is a complete workspace for working with AI, not a collection of temporary chats.

05 / SECURITY

Your API keys. Your data. Your control.

EidoStack follows the Bring Your Own Key (BYOK) approach. You connect your own AI provider API keys and use them to interact directly with models. For regular use in the Playground, keys are encrypted in your browser and are not stored on EidoStack servers.

Secure API key storage in your browser

EidoStack uses the Web Crypto API to encrypt your keys locally. The vault is protected by a master password, and decrypted keys are only available while the vault is unlocked.

  • Local encryption. API keys are encrypted directly in your browser.
  • Master password. Access to the encrypted vault is protected by your password.
  • Direct provider requests. In regular Playground mode, requests are sent directly to API providers.
  • Your own accounts. You retain control of your API keys, usage limits, and request billing.
  • Backup and restore. Create an encrypted backup of your vault and restore it when needed.

Work with different AI models without giving EidoStack permanent control over your API keys.

Learn More About Security

Additional Security Benefits

01.

Client-Side Encryption

Your API keys are encrypted directly in your browser using the Web Crypto API.

02.

Bring Your Own API Keys

You interact with models through your own provider accounts and pay for API requests directly.

03.

Encrypted Backups

Transfer and restore your key vault without saving unencrypted credentials in regular files.

Common Questions

What is EidoStack?
EidoStack is a Multi-Model AI Playground for developers. It lets you chat with AI models from different providers, compare responses, experiment with prompts and settings, and track token usage and request costs. All the tools are available in one browser-based workspace using your own API keys.
How is EidoStack different from regular AI chats?
A regular AI chat provides an interface for interacting with a single model or a set of models within a particular platform. EidoStack brings models from different API providers into one Playground and provides additional tools: response comparison, system prompt configuration, context management, token statistics, and request cost analysis.
Which AI providers does EidoStack support?
EidoStack supports models from OpenAI, Anthropic, and Google AI. You can connect your own API keys and use available models from these providers in one interface. The list of supported models is updated as the platform and provider APIs evolve.
Can I just chat with AI models without using comparison mode?
Yes. EidoStack lets you use a regular chat interface to interact with your selected AI model. You can ask questions, send instructions, continue conversations, and save message history. Comparison mode is an additional feature you can use whenever you need it.
Can I compare models from different providers?
Yes. EidoStack lets you send the same prompt to multiple supported models and compare their results side by side. Free plan users can compare models from one connected provider. The Pro plan enables comparisons between models from different connected providers.
Can I configure system prompts?
Yes. You can set custom system instructions to control model behavior. For example, you can define the AI's role, communication style, response format, and additional rules. EidoStack also lets you experiment with different system prompts and explore how they work across models.
Which context strategies are available?
EidoStack supports several ways to build the context passed to a model. You can send only the current prompt, include a system prompt without conversation history, use the full conversation history or recent messages, or retrieve relevant snippets through semantic search. This lets you experiment with context usage and control the number of tokens sent.
Can I track the cost of using AI models?
Yes. EidoStack shows token usage and estimated API request costs. You can view statistics for individual responses and analyze usage by model, chat, provider, and time period. Actual charges are determined by the relevant API provider's pricing.
Where are my API keys stored?
In regular Playground mode, API keys are stored in encrypted form directly in your browser. EidoStack uses the Web Crypto API and a master password to protect the vault. Keys are not stored on EidoStack servers during regular interactions with AI models.
Do I need to pay AI providers separately?
Yes. EidoStack uses the Bring Your Own Key model. You connect your own API keys and pay OpenAI, Anthropic, Google, or another supported provider directly for model usage. The EidoStack subscription gives you access to Playground features and is billed separately from API requests.

ONE PLAYGROUND. MULTIPLE AI MODELS.

All your AI models. One Playground.

Chat with AI models from different providers, experiment with prompts, compare responses, and stay in control of costs.

Everything you need to work with AI in one convenient workspace.

Connect your own API key and start exploring what AI can do today.

Get Started for Free

No installation required. Works right in your browser.

EidoStack Features — Multi-Model AI Playground for Developers