Comparison
| Tool | Price from | Free plan | Category |
|---|---|---|---|
| TTetriz Harness | not listed | yes | Browser extensions |
 RegexAI | not listed | yes | Browser extensions |
 Pinokio | not listed | ? | Browser extensions |
 MaxAI | 12 USD/mo | yes | Browser extensions |
 HARPA AI | 55.4 PLN/mo | ? | Browser extensions |
 Gemini in Chrome | 97.99 PLN/mo | ? | Browser extensions |
 Sider | not listed | yes | Browser extensions |
 Warp | 20 USD/mo | yes | AI agents |
 LM Studio Bionic | 20 USD/mo | yes | Productivity & notes |
Each alternative in short
1. RegexAI
Builds regular expressions from plain-English descriptions and tests them live, for developers who write or debug regex.
Yes, there is a free plan. Free to use, no signup, according to the page.
2. Pinokio
One-click launcher and browser for running open-source AI and other apps locally on your own computer.
The vendor does not state this clearly on the homepage or pricing page.
3. MaxAI
Browser extension that gives an AI assistant sidebar for reading, writing, summarizing and translating content on any webpage.
Yes, there is a free plan. Unlimited Free chat with the fast free AI model, 3 Pro chats per day, limited file uploads, basic browser features.
4. HARPA AI
Chrome extension giving access to many AI models on any web page, for summarizing, writing, research and web automation.
The vendor does not state this clearly on the homepage or pricing page.
5. Gemini in Chrome
AI browsing assistant built into Google Chrome that answers questions about open tabs, summarizes pages and videos, and can act on web tasks.
The vendor does not state this clearly on the homepage or pricing page.
6. Sider
AI sidebar and browser agent that chats with multiple AI models, summarizes web pages, and automates browser tasks.
Yes, there is a free plan. The pricing page lists a free tier for translation (basic model) and the Chrome extension itself; the exact free credit allowance is not stated in the text.
7. Warp
Open platform for running fleets of coding agents across the software development lifecycle, plus an agentic terminal and CLI for developers and teams.
Yes, there is a free plan. Free plan includes core terminal features, Warp Agent CLI access, limited cloud agents access, and bring-your-own AI inference; additional agent usage is at pay-as-you-go rates. Page also mentions qualified teams getting up to $10k in free factory usage.
8. LM Studio Bionic
Local-first AI agent for documents, slides, PDFs, and code, running open models on your computer with optional cloud frontier models.
Yes, there is a free plan. Free plan includes Bionic Agent, local model support using llama.cpp and MLX, offline voice transcription, LM Link for up to 5 devices, and limited web search.
FAQ
What is the best alternative to Tetriz Harness?
The most popular option in the same category is RegexAI. See the comparison table above.