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Cycling

For cyclists — pace calculator (works for any cadence-based effort), heart rate training zones, interval timers for the threshold and VO2 max sessions. Macros + hydration matter more on the bike than most sports — calories tool covers the long-ride fueling math.

7 tools · 3 sections

Pace + intervals

3 tools

Pace per km/mi, sweet-spot intervals, VO2 max repeats.

Running Pace Calculator

Calculate running pace, finish time, or distance. Race time predictions and splits.

Precise stopwatch with lap tracking.

Countdown Timer

Set a countdown timer with custom duration.

Training zones

1 tools

Heart rate zones for endurance / tempo / threshold / VO2.

Heart Rate Zones

Calculate your training heart rate zones.

Long-ride fueling

3 tools

Calories / hour, electrolytes, post-ride macros.

Calorie Calculator

Calculate daily calorie needs based on your goals and activity.

Water Intake Calculator

Find out how much water you should drink daily.

Macro Calculator

Calculate your daily protein, carbs, and fat targets.

Looking for something specific? Browse all 240 tools.

Built browser-first. Run by one developer.

Every tool runs on your device. No tracking pixels, no sign-up to start. The numbers below are pulled live from the registry.

240

Free tools

Across 14 categories

7

Visual editors

PDF · image · video · audio

32

Curated kits

By profession + lifestyle

17

AI tools

Powered by Claude API

Files never uploadNo tracking pixelsNo sign-up neededWorks in any modern browser

The handful of AI tools (paraphrase, summarise, blog, captions, etc.) send your prompt text to Anthropic's Claude API to do the work. Files, images, PDFs and video never leave your device. Pick the tools that fit your privacy comfort.