Free tools
Answers you can get in ten seconds
No sign-in, no email, nothing leaves your browser. Every figure is read from the maker's own published page, and where nobody has published one, the tool says so instead of guessing.
No signup · nothing leaves your browser · web-verified & dated
Tools shown. 23 of 23 tools
For anyone with a device
- Checker
Is your phone still getting security updates?
Phone Security Update CheckerPick your model for the end date and the months remaining. Every figure is read from the maker's own support page, and there is no invented date where a maker has promised nothing.
Your phone modelAn end date, and the months left - Checker
When does your laptop stop getting updates?
Computer Security Update CheckerWindows is answered by your version rather than your machine, Chromebooks have a published date per model, and Apple publishes none at all, so the tool asks which system you use before it answers.
Which system you runAn end date, and the months left - Diagnosis
Why is your computer so slow?
Why Is My Computer So Slow?Describe what the slowness looks like and the causes rank themselves against it, each with a way to confirm it yourself. It also names the causes your answers rule out, and the popular fixes that do nothing.
Symptoms you can seeRanked causes, cheapest fix first - Checker
Is your router still supported?
Router Security Update CheckerUK law makes everyone selling one publish a support period, but almost nobody publishes it in a form you can look a model up in. The tool holds the two makers that do, Asus and TP-Link, plus the boxes the big UK broadband providers supply, and it says plainly when nobody has published an answer rather than letting an empty result read as an all-clear.
Your router modelAn end date, or who never published one - Ranking
Which phones get updates for longest?
Phones With the Longest Security SupportEvery phone whose maker publishes a security-update end date, ranked by the months actually left. Samsung and Apple publish no per-model date, so they are named rather than quietly omitted, because an absence inside a ranking reads as a low score.
Nothing to enterEvery phone ranked by months left - Calculator
Is that repair quote worth paying?
Repair or Replace Your PhoneThe figure the repair shop will not give you is how many months of security support the phone has left. A repair buys only those, a new phone buys a whole window. Both money figures are yours and stay in your browser.
The quote, and a new priceCost per month, both ways
Cost calculators
- Calculator
AI Agent Cost Calculator
What does running an AI agent actually cost? Models the context that compounds every step, the reason multi-step agents cost far more than single calls, across GPT, Claude & Gemini.
Steps, model, contextWhat a month of agent runs costs - Calculator
Prompt Caching Savings Calculator
How much does prompt caching cut your LLM input bill? Set your reused-prompt size and cache-read discount to see monthly cost with vs without caching, provider-agnostic.
Prompt size, reuse rateWhat caching saves per month - Calculator
AI Subscription vs API
Is ChatGPT Plus / Claude Pro worth it, or is the API cheaper for you? Enter your usage to see the monthly cost both ways and the exact break-even.
Your monthly usageWhether the plan or the API wins - Calculator
AI API Cost Calculator
Estimate your monthly API spend across the current GPT, Claude, and Gemini tiers from your own usage, ranked cheapest-first.
Tokens per monthMonthly spend, cheapest model first - Calculator
Build vs Buy: Local-AI Payback
Enter your monthly API spend → see when an RTX 5090, 4090, or Mac Studio pays for itself vs paying per-API.
Your monthly API spendThe month the hardware pays for itself
Side-by-side comparisons
- Table
AI Model Comparison
Context windows, prices, modality, and open-weights status for every major model, filterable, side by side.
Nothing to enterEvery major model, side by side - Table
AI Subscription Comparison
ChatGPT vs Claude vs Gemini vs Perplexity vs Grok: every consumer plan by price, models, and limits.
Nothing to enterEvery consumer plan, side by side - Table
AI Image Generation Cost
Midjourney, DALL·E, Imagen, Ideogram, Leonardo, Firefly + free self-host, by subscription, per-image, and rights.
Nothing to enterEvery image generator, by price - Table
AI Coding Assistant Comparison
Cursor, Copilot, Claude Code, Cline, Zed + more, by price, billing model, and features.
Nothing to enterEvery coding assistant, by price
Hardware & model pickers
- Calculator
How Much Unified Memory Do You Need?
16 GB or 24 GB? Unified memory is shared with the OS, so a 16 GB Mac never gives a model 16 GB. See the honest minimum and which machines fit.
Your Mac's memoryWhat a model actually gets - Checker
Local-LLM GPU Checker
Pick your GPU (or enter VRAM) and see exactly which open LLMs you can run locally, and at which quantization.
Your GPU, or its VRAMWhich models run, at which quantization - Picker
Which AI Model Should I Use?
Answer a few questions about your use case and budget, get a top pick plus two alternatives with the reasoning.
A few questionsOne pick, plus two alternatives - Recommender
What GPU Do I Need?
Pick the model you want to run → the minimum GPU (or Mac) that runs it locally, plus every card that fits.
The model you want to runThe cheapest card that runs it - Calculator
Fine-Tuning VRAM Calculator
How much GPU memory to fine-tune a model? Full vs LoRA vs QLoRA side by side, with the minimum GPU each needs.
Model size, and methodThe GPU memory you need
Tokens & context
- Counter
Token Counter
Paste any text → exact GPT / Claude / Gemini token count, words, characters, per-model context-window fit, and the cost to send it. Runs in your browser.
Any text you pasteExact token counts, per model - Converter
Tokens ↔ Words Converter
How many words is 1M tokens? Convert tokens to words, words to tokens, or either to characters, and see how much fits in an 8K–1M context window. The quick estimate; for an exact count of specific text, use the Token Counter.
A word or token countThe conversion, and what fits - Calculator
Context Window Calculator
Will your document fit? Words, pages, or tokens → which models can hold it in one context window, and the cost.
Your document's lengthWhich models can hold it
Go deeper
The guides behind the numbers. Read the concept, then run the tool.
- GuideHow long will my phone get security updates?
- GuideThe best laptops for running local AI models in 2026
- GuideWhat thermal throttling is, and why thin devices slow down
- GuideWhat happens when your phone stops getting security updates
- GuideHow long does Apple support iPhones?
- GuideProject Zero's 0-click chain reaches the Pixel 10 kernel