Runs on your machine/No account, no upload/Free, ad-supported
Most used
2D Game Dev
Lab
One pipeline, 8 tools. Plan the game, generate the world, pack the sprites, build the tileset, fit the collision shapes, make the sounds, then balance what the player earns.
Godot · Unity · Tiled · LDtk exports
Workflow
Build a 2D game
Plan Your Game
Game Design Doc Generator
- 2
Generate Your World
2D Procedural Level Generator
- 3
Create Production Assets
Sprite Sheet Generator
- 4
Build Smart Tiles
Bitmask Autotile Generator
- 5
Generate Collision
Auto Hitbox Generator
- 6
Create Retro Audio
Retro SFX Generator
- 7
Balance Gameplay
RPG Economy / XP Balancer
- 8
Design Rewards
Loot Table Simulator
Also featured
Jaconir NMR
Lab
One workflow. Four instruments. Remove impurities, predict shifts, understand splitting, then assign — you stay in control.
Impurity → Predict → Split → Assign
- 01
Clean
Impurity Solver
Identify solvent impurity peaks before you trust the spectrum.
- 02
Predict
Chemical Shift Predictor
Estimate expected ¹H environments from molecular context.
- 03
Split
Splitting Pattern Simulator
See why peaks split — n+1, Pascal intensities, J-coupling.
- 04
Assign
Peak Assignment Assistant
Assign peaks to atoms with shift, multiplicity, and structure.
Full library
Game development, developer utilities, creator tools, and the chemistry instruments outside the NMR workflow — same local-first philosophy.
Browse everythingGame Development
Sprites, levels, hitboxes, loot tables, and more.
Game Design Doc Generator
Turn a game idea into a structured, scoped design document.
2D Procedural Level Generator
Generate seeded 2D levels and export them as engine-ready tilemaps.
Sprite Sheet Generator
Pack animation frames into a padded atlas with a JSON data file.
Bitmask Autotile Generator
Build a full 47-tile terrain set from two source tiles.
Auto Hitbox Generator
Trace a sprite's alpha into a collision polygon automatically.
Retro SFX Generator
Synthesize 8-bit jumps, coins and explosions in the browser.
RPG Economy / XP Balancer
Model level curves, gold flow and stat progression.
Loot Table Simulator
Verify drop rates with Monte Carlo simulation before shipping.
Built for evidence,
not guesswork.
Deterministic browser tools — not cloud models that invent answers.
01
Privacy first
Most tools run client-side. Your data stays on your machine.
02
Instant access
No accounts, no paywalls, no trials. Open a tool and start working.
03
Research-ready
Transparent logic you can verify — not opaque AI output.
What this is, and what it is not
Worth reading before you rely on any of it.
Everything here is a calculation you could do yourself, done faster and shown in full. The impurity solver compares your peaks against published solvent shift tables and tells you which solvent it matched and by how much. The splitting simulator applies n+1 and Pascal intensities and draws the result. The autotile generator derives its 47 cases from an eight-bit neighbour mask, and will show you the mask behind any tile you click. When a tool cannot answer confidently, it says so instead of producing a number that looks like an answer.
The chemistry side started with NMR — impurity identification, shift prediction, splitting patterns, peak assignment — and grew to cover exact mass and adduct calculation, electron configurations, equation balancing and titration curves. The game development side is a pipeline rather than a pile of tools: sprite sheets, autotile sets, collision shapes, procedural levels, loot tables and economy balancing, each exporting into Godot, Unity, Tiled or LDtk. The developer and creator tools are the smaller things that come up constantly — extracting assets from a page, checking an env file, blurring a video background, packing a favicon.
What it is not: a replacement for MestReNova, TopSpin or a proper proteomics suite. These tools are built for the pass you make before you open the expensive software, and for coursework and learning where the expensive software is not available at all. They are also not an AI product. Nothing here calls a language model, which is why the results are reproducible and why every page can explain exactly how it arrived at what it shows you.
It is built and maintained by Dafin Edison J, solo, and paid for by advertising rather than by subscriptions or by selling anything you type into it. Corrections are welcome — if a tool gives you a wrong answer, that is worth an email.
Frequently asked questions
Everything you need to know about Jaconir.
What is Jaconir?
A set of free tools that run in your browser, grouped into four areas: an NMR and chemistry lab for analytical work, a 2D game development pipeline covering sprites through level layout, developer utilities, and creator tools for video and images. There is no account, no trial and no paid tier — you open a tool and use it.
Do the tools upload my files?
Almost never, and the exceptions are stated on the tool that has them. Image, video, sprite and spectrum work happens entirely in your browser: the file is read into the page and never transmitted. The one routine exception is the asset extractor, which needs a server to fetch the page you point it at, because a browser is not allowed to read a document from another site. That page says so directly.
Do I need to create an account?
No, and there is nothing to create one with — there is no login, no email capture and no trial. Tools that remember your recent work keep it in your own browser storage rather than on a server, which also means clearing your browser data clears it.
Do the tools use AI?
No. Every result comes from explicit rules you can check: the impurity solver matches shifts against published solvent tables, the splitting simulator applies n+1 and Pascal intensities, the autotile generator derives its 47 cases from an eight-bit neighbour mask. That is a deliberate choice for scientific work, where an answer you cannot audit is worse than no answer at all.
Can I use the output in my research or in a commercial project?
Yes. Anything you generate is yours, for academic, personal or commercial use, with no attribution required. For published scientific work, treat these as a first pass and confirm anything load-bearing against your primary software — that is ordinary practice for any prediction tool, ours included.
How is the site paid for, if everything is free?
Advertising, and nothing else. There is no paid tier, no data sold and no email list. The site uses Google Analytics to count visits and shows ads to cover hosting; the privacy policy sets out exactly what is collected and how to opt out. Nothing you put into a tool is part of that.
Who builds these?
Dafin Edison J, working solo. The tools come from problems worth solving twice — reading NMR spectra, building 2D game assets, extracting design assets from a page — and each one is documented on its own page with what it does, how it works, and where it stops being reliable.
Built for research — and builders.
Chemistry, game development, and the everyday work in between. No account, no paid tier, and nothing you put into a tool leaves your machine.