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Discover▾

Not sure where to start? This week’s hottest software, models and stacks in three minutes.

AI Apps▾

AI software people use: from assistants like ChatGPT to tools for coding, video and workflows, picked by purpose.

For Agents▾

Software for AI: tools that let your agent (Claude Code, Codex, Cursor…) browse, read docs, run code and remember.

Models▾

Choose models, estimate cost, self-host: prices, rankings, benchmarks, free tiers and compute.

Solutions▾

A goal or an error message? Ready-made stacks, steps and fixes by scenario.

Learn▾

A systematic course from zero to the frontier, with an algorithm library, must-read papers and tutorials.

Frontier▾

Daily AI news, weekly highlights, the latest papers and how AI is changing every discipline.

// Solve

Solve a real problem with AI

Start from who you are and what you need: 24 scenarios for 7 audiences, each with steps, costs, alternatives, ready-made stacks and fixes for common problems.

Find yours by audience ↓ All 45 problems →
scenarios
24
answered problems
45
software stacks
44
audiences
7

prices from official pages, with check datesevery answer links to official docs

01By audience

Pick the group closest to you; the most relevant scenarios come first.

Writing, translation, knowledge bases, private local AI

  1. 01✍️ Everyday work: writing, translation and slidesAll major assistants have free tiers with lower limits and fewer models
  2. 02🧠 Personal knowledge base: AI that answers from my filesNotebookLM is free to use; Obsidian is free; the local route is all open source
  3. 03🖥️ Run models on your own machineAll software is free
  4. 04🎁 Find free AI resources and creditsFree APIs usually have rate and daily limits
  5. 05🧭 Use AI compliantly in mainland ChinaMajor domestic assistants are basically free
  6. 06🧱 Build apps and sites without codingLovable, v0, Bolt and Replit all have free credits for prototypes
  7. 07🎙️ Creators: voice-over, podcasts and AI musicWhisper, CosyVoice, GPT-SoVITS and others are free; Suno has free credits (commercial rights on free plans per its terms)
  8. 08🗓️ Meeting notes and team workflow automationMost notetakers have free minutes; faster-whisper is free locally
  9. 09🔁 Switch models: your own key, Chinese or local modelsFree APIs exist; see the Free API page
  10. 10🎓 Learn AI (roadmaps, tutorials)Our courses and curated tutorials are free
  11. 11💸 Control AI costs and usage limitsccusage, LiteLLM and Portkey open source are free

02By scenario

Each scenario page has: steps · cost tiers · alternatives · when not to use · stacks · problems · related model pages.

35 tools · 2 stacks 💸 Control AI costs and usage limitsSee what Claude Code, Codex and API calls actually use, set budgets and rate limits for a team, and route requests to cheaper models when it makes sense. Developers · Small teams & business · Enterprise IT · Individuals 2 problems → 86 tools · 2 stacks 🛡️ Let agents run safelyGive agents an isolated place to run, limit which files and networks they can touch, be able to undo mistakes, and defend against prompt injection and leaked secrets. Developers · Enterprise IT 6 problems → 301 tools · 6 stacks 🔌 Connect tools to agents (MCP, CLI, auth)Pick the smallest set of MCP servers and CLIs that does the job, set up authentication, and fix connection failures or tool lists that flood the context window. Developers 3 problems → 143 tools · 3 stacks 📐 Share rules and skills across agentsReuse one AGENTS.md and one set of skills across Claude Code, Codex, Cursor and Gemini CLI instead of maintaining copies. Developers 3 problems → 117 tools · 2 stacks 🔁 Switch models: your own key, Chinese or local modelsPoint coding agents and apps at other vendors, Chinese models or local models, and understand protocol compatibility and differences in tool-calling quality. Developers · Individuals 2 problems → 82 tools · 5 stacks 🖥️ Run models on your own machineEstimate what your VRAM or RAM can run, pick an inference runtime, and configure context length and chat templates. Individuals · Developers · Researchers 5 problems → 82 tools · 2 stacks 🧭 Use AI compliantly in mainland ChinaCompliant ways to use AI in mainland China: filed domestic platforms, self-hosted open-weight models, and grey-market practices to avoid. Access from China has not been tested in this release. Individuals · Enterprise IT · Developers 1 problems → 144 tools · 5 stacks 📄 Build RAG and process documentsTurn PDFs and web pages into clean text, choose vector stores and rerankers, debug poor retrieval, and give agents long-term memory. Developers · Enterprise IT · Researchers 3 problems → 73 tools · 2 stacks 📈 Evaluate and monitor AI qualityBuild regression tests for prompts and agents, record traces, catch silent model degradation, and tell vendor-reported scores from independent ones. Developers · Enterprise IT 2 problems → 0 tools · 2 stacks 🎁 Find free AI resources and creditsFree APIs, open-weight models, limited-time offers and new-user credits, with conditions and verification dates; for student perks such as the GitHub Student Pack and free Copilot see the Students scenario. Individuals · Students · Developers 1 problems → 132 tools · 1 stacks 🧪 Choose tools and avoid pitfallsCheck whether a project is still maintained, whether its licence allows commercial use, whether it was renamed or acquired, where to migrate when it stops, and how to choose frameworks and platforms. Developers · Enterprise IT · Small teams & business 4 problems → 225 tools · 2 stacks 🎓 Learn AI (roadmaps, tutorials)Learning paths from complete beginner to developer and researcher, plus curated free external tutorials and the software you need along the way. Students · Individuals · Developers · Researchers 1 problems → 16 tools · 2 stacks ✍️ Everyday work: writing, translation and slidesPick one main AI assistant for email, reports, translation, summaries and slides; understand free vs ~$20 tiers and options available in China. Individuals · Small teams & business · Students 1 problems → 13 tools · 4 stacks 👩‍💻 Code with AI: choose tools, keep qualityChoose between Cursor, Claude Code, Codex, Copilot and others, set up rules files and tests, and keep AI-written code reviewable and reversible. Developers · Students 1 problems → 7 tools · 2 stacks 🧱 Build apps and sites without codingShip a real product with natural-language builders such as Lovable, v0, Bolt and Replit, and add sign-in, database permissions and security checks before launch. Individuals · Small teams & business · Creators 1 problems → 10 tools · 2 stacks 🧠 Personal knowledge base: AI that answers from my filesCollect notes, PDFs and web pages in one place and have AI answer only from them with citations, either in the cloud (NotebookLM etc.) or fully local. Individuals · Researchers · Students 1 problems → 13 tools · 5 stacks 🏢 Private LLMs and knowledge bases for the enterpriseDeploy chat, knowledge-base and agent platforms on your intranet or private cloud: choose models and inference engines, size hardware, set permissions and audit, and check compliance in China. Enterprise IT · Small teams & business 2 problems → 7 tools · 3 stacks 🎧 AI customer support and sales assistantsAnswer common questions with a knowledge-base bot and hand complex ones to humans; let AI draft follow-ups and tidy the CRM while people approve what goes out. Small teams & business · Enterprise IT 0 problems → 12 tools · 2 stacks 🗓️ Meeting notes and team workflow automationTranscribe meetings and turn action items into tasks automatically, use local transcription for sensitive meetings, and automate repetitive flows with n8n or Zapier. Small teams & business · Individuals · Enterprise IT 1 problems → 9 tools · 3 stacks 🔬 Research: find, read and review literatureUse AI to search and read papers, write literature reviews and translate PDFs, verify that every citation exists, and disclose AI use per journal policy before submitting. Researchers · Students 2 problems → 7 tools · 2 stacks 📊 Data analysis and reports with AILet AI read spreadsheets, write SQL and produce charts and reports, with read-only access, agreed metric definitions and every number traceable to a query. Small teams & business · Researchers · Enterprise IT 0 problems → 15 tools · 4 stacks 🎬 Creators: AI images and videoChoose image, video and editing tools and build a script-to-final-cut pipeline; check commercial rights and label AI-generated content where rules require it (e.g. mainland China). Creators · Small teams & business 2 problems → 13 tools · 4 stacks 🎙️ Creators: voice-over, podcasts and AI musicText-to-speech, voice cloning, podcast transcription and editing, and AI music, comparing cloud and local open-source options, plus voice consent and commercial terms. Creators · Individuals 0 problems → 12 tools · 3 stacks 📚 Students: study with AI (the right way)Use AI to explain, quiz you, organise notes and practise languages rather than write for you; know your school’s AI rules and the free perks available to students. Students 1 problems →

03Common problems

All 45 →

04Ready-made stacks

All 44 stacks →

Proven combinations of tools for common jobs.

Data updated: Solutions & stack guides(UTC+8)