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Tools165 free tools that run in your browser.PDF toolsMerge, split, compress and convert PDFs.Image toolsCompress, convert, resize and make ID photos.Audio & videoTrim, convert and record audio and video.Text toolsCount, clean, compare and convert text.Developer toolsJSON, encoding, network and security utilities.CSS & designGradients, shadows, colours and layout CSS.CalculatorsEveryday numbers, dates and conversions.

Games

GamesBoard and card games, ready in one click.Board gamesChess, Go, Xiangqi and 14 more. Play a friend online.Card gamesSolitaire, Hearts, Spades and 40+ classics.MahjongEight regional Mahjong variants with friend rooms and bots.Dou DizhuSix Dou Dizhu variants: classic, wild cards, four players and more.

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TarotA card reading as a prompt for reflection.Skill RankDiscover and compare AI agent skills.CiteProofCheck a bibliography against real records.HACKER_Hackathons, AI competitions and developer challenges.

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Tools

Tools165 free tools that run in your browser.PDF toolsMerge, split, compress and convert PDFs.Image toolsCompress, convert, resize and make ID photos.Audio & videoTrim, convert and record audio and video.Text toolsCount, clean, compare and convert text.Developer toolsJSON, encoding, network and security utilities.CSS & designGradients, shadows, colours and layout CSS.CalculatorsEveryday numbers, dates and conversions.

Games

GamesBoard and card games, ready in one click.Board gamesChess, Go, Xiangqi and 14 more. Play a friend online.Card gamesSolitaire, Hearts, Spades and 40+ classics.MahjongEight regional Mahjong variants with friend rooms and bots.Dou DizhuSix Dou Dizhu variants: classic, wild cards, four players and more.

Create & choose

CreatorsAnalyze a public account, review recent posts and plan the next one.VPS pickerDescribe your project. Get a VPS shortlist.

More

TarotA card reading as a prompt for reflection.Skill RankDiscover and compare AI agent skills.CiteProofCheck a bibliography against real records.HACKER_Hackathons, AI competitions and developer challenges.

Read & talk

BlogPractical guides with sources.CommunityReviews, recommendations and red flags.

pi-rsi · Full search tree

Inspect recorded scores, code ancestry and the evidence behind research knowledge.

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Search tree

Best score path Selected ancestry

Improved No change Worse Failed Running Planned Abandoned

Drag to pan · scroll to zoom · click a node to inspect. This is a snapshot, not a live view.

Score curve

Finished nodes only. Axis is a snapshot of recorded scores.

Research knowledge

Node ledger

Snapshot and interpretation

Archived data; the page does not poll the running experiment. Search-validation scores and Wiki statuses are not independent confirmation. Original experimental records remain in their source language.

Experiment metadata · Wiki metadata · Frozen protocol