
Natural Cycles MCP
Your Natural Cycles data in ChatGPT and Claude, only when you allow it.
Natural Cycles has no official MCP server.
Memory.fit is a hosted MCP server for athletes. It has no direct Natural Cycles connection: link Natural Cycles to Apple Health, connect Apple Health in the Memory.fit app, add one address to your AI, and it reads period days and flow, cycle start dates, spotting.
This needs the Memory.fit iPhone app, which is coming: join the waitlist. On Android, Memory.fit reads Health Connect today.
The address to add to your AI
https://api.memory.fit/mcp?src=mcp-natural-cyclesMCP address: https://api.memory.fit/mcp
Natural Cycles and your AI, in short
- Official Natural Cycles MCP
- None
- Memory.fit
- Hosted MCP server, nothing to install
- Your AI reads
- Period days and flow, Cycle start dates, Spotting
- Workouts to Natural Cycles
- No
- Works in
- ChatGPT, Claude, Grok Bot, Gemini and any MCP app
- Price
- $9 a month or $69 a year, with 7 days free
Checked November 10, 2026.
What your AI reads
What your AI can read from Natural Cycles
Once Natural Cycles is connected in the Memory.fit app, every AI you add reads the same history, under its own permissions.
- Period days and flow
- Cycle start dates
- Spotting
- Ovulation test results, when logged
The tools that read it:get_cycleget_dayget_trendsget_sleep
Setup
Set up Natural Cycles in your AI
1. In the Memory.fit app
- 01In Natural Cycles, open Settings, Integrations, turn on Apple Health and choose to export what you want to share.
- 02In the Memory.fit app, open Settings → Health data, connect Apple Health and allow cycle tracking.
- 03Under Settings → AI agents, turn on Cycle data for each AI that may see it. It is off until you do.
- 04Your AI can then read your cycle day, phase and average length.
The Memory.fit iPhone app is not on the App Store yet. Join the waitlist and we'll tell you the day it is.
2. In your AI
Pick your AI. Each one connects to your Memory.fit account, with a sign in or a key.
ChatGPTOn a computer · about two minutes
- 01On chatgpt.com, open Plugins and tap +, then Add custom MCP server
- 02Name it Memory.fit and paste the address
- 03Choose OAuth, confirm the warning, then Create as a plugin and sign in
- 04In a new chat, type @ and pick Memory.fit
The address: https://api.memory.fit/mcp?src=mcp-natural-cycles
Coming soon: one tap from ChatGPT's plugin directory.
ClaudeAny plan · about a minute
- 01Install in Claude
- 02Tap Add, then sign in to Memory.fit
- 03In a chat, turn on Memory.fit under + › Connectors
Claude adds new connectors on the web or desktop. On a phone, use a computer once, and after that it works in the Claude app too.
Grok BotComes with X Premium, Super or Ultra, or a legacy Cursor plan
- 01In the Memory.fit app, open Settings → AI agents → Grok Bot and copy your Memory.fit link.
- 02Open Grok Bot on your computer or phone and message any of your Bots.
- 03Send “Add a custom MCP server called Memory.fit at” and paste your Memory.fit link.
- 04Check the name and link it shows you, then approve it.
- 05Tap Authorize and sign in with your Memory.fit account. Memory.fit works from your next message.
The address: https://api.memory.fit/mcp?src=mcp-natural-cycles
MuseUS only · 18+
- 01In the Memory.fit app, open Settings → AI agents → Muse and create your key.
- 02In a Muse chat, say: “Add a custom connector called Memory.fit. Its address is the link I’ll paste, and it needs a key.”
- 03Paste your Memory.fit address when Muse asks.
- 04Paste your key into Muse’s secure credentials prompt, never into the chat.
The address: https://api.memory.fit/mcp?src=mcp-natural-cycles
Muse connects with a key from the Memory.fit app. Paste it into Muse's settings, never into a chat.
DotsChatGPT Pro, Business Premium or Enterprise
- 01In the Memory.fit app, open Settings → AI agents → Dots and copy your Memory.fit link.
- 02On chatgpt.com in your browser, open Plugins and tap +.
- 03Choose Add custom server, name it Memory.fit and paste your Memory.fit link.
- 04Pick sign-in, then sign in with your Memory.fit account and choose what it may do.
- 05In your dot's app settings, allow Memory.fit. Then message your dot.
The address: https://api.memory.fit/mcp?src=mcp-natural-cycles
GeminiPersonal Google account · 18+
- 01On gemini.google.com: Customize › Connectors
- 02Tap + Custom
- 03Paste the address, tap Next, then Connect, and sign in to Memory.fit
- 04In a chat, type @ and pick it under Connectors
The address: https://api.memory.fit/mcp?src=mcp-natural-cycles
No + Custom button? Work accounts don't have it: use a personal Google account. Gemini asks you to allow each change it makes.
GrokSign in · about a minute
- 01Copy the address
- 02In Grok: Settings › Connectors › Custom Connector › Connect
- 03Name it Memory.fit, paste it, tap Add Connector, then sign in to Memory.fit
The address: https://api.memory.fit/mcp?src=mcp-natural-cycles
Perplexity ComputerPro · about two minutes
- 01Copy the address
- 02On perplexity.ai: Settings › Connectors › + Custom connector › Remote
- 03Name it Memory.fit, paste the address and choose API key
- 04Paste your key from the Memory.fit app, then save
The address: https://api.memory.fit/mcp?src=mcp-natural-cycles
Perplexity Computer connects with a key from the Memory.fit app. Paste it into Perplexity Computer's settings, never into a chat.
Cursor
- 01In the Memory.fit app, open Settings → AI agents → Cursor and create your key.
- 02Add the block to ~/.cursor/mcp.json (or .cursor/mcp.json in a project).
- 03Check Cursor Settings → Tools & MCP shows Memory.fit as connected.
{
"mcpServers": {
"memory-fit": {
"url": "https://api.memory.fit/mcp?src=mcp-natural-cycles",
"headers": { "Authorization": "Bearer mem_pat_your_key" }
}
}
}Cursor connects with a key from the Memory.fit app. Paste it into Cursor's settings, never into a chat.
Claude CodeOn a computer · Claude Code · about a minute
- 01In your terminal, run the command
- 02Start Claude Code and run /mcp
- 03Pick memory-fit and sign in to Memory.fit
claude mcp add --transport http memory-fit "https://api.memory.fit/mcp?src=mcp-natural-cycles"CodexOn a computer · Codex CLI · about a minute
- 01In your terminal, run the command
- 02Then run: codex mcp login memory-fit
- 03Sign in to Memory.fit in the browser that opens
codex mcp add memory-fit --url "https://api.memory.fit/mcp?src=mcp-natural-cycles"Try it
Try these prompts
“What cycle day am I on, and is the phase measured or estimated?”
Uses:get_cycle
“Look at my last few cycles and tell me how long they were and how much they varied.”
Uses:get_cycleget_trends
“How has my sleep looked across the days of my cycle this month?”
Uses:get_sleepget_cycle
“Put my hard sessions this week next to my cycle day and tell me what you see.”
Uses:get_dayget_cycle
“Plan next week's training around my usual routine, and mention my cycle day only if I asked for it.”
Uses:get_cycleplan_session
Your options
Every way to get Natural Cycles into an AI
Natural Cycles runs no MCP server. Community servers run on your own computer, hosted services run it for you, and so does Memory.fit.
| Option | Where it runs | What you need |
|---|---|---|
| Community serverdavidmosiah/wellness-cycle-coachOn your own computer | On your own computer | A list of period start dates that you or your AI pass in, run by a server on your own computer. It is not connected to Natural Cycles. |
| Hosted MCP serverMemory.fit MCPHosted, in ChatGPT, Claude, Grok Bot, Gemini and any MCP app | Hosted, in ChatGPT, Claude, Grok Bot, Gemini and any MCP app | The Memory.fit app on iPhone with Apple Health connected and Natural Cycles syncing with it, plus Cycle data turned on for each AI that may see it. $9 a month or $69 a year, with 7 days free. |
When another option is better
- You use Natural Cycles to prevent or plan a pregnancy: keep using its own app for that. Memory.fit and your AI are not a contraceptive or a medical device and do not replace it.
Limits, said plainly
- Your AI sees nothing about your cycle until you turn on Cycle data for that AI. It is off for every AI by default, and you can turn it off again at any time.
- Natural Cycles' help describes syncing with Apple Health on iOS only, not Android.
- Natural Cycles exports temperature to Apple Health only for thermometer users, and what Memory.fit reads is what Natural Cycles writes there.
- Memory.fit is not a contraceptive and not a medical device. It shows plain facts such as cycle day and average length, with no diagnosis, no fertility or contraception advice and no medical advice.
- Memory.fit reads what Natural Cycles shares and sends nothing to it.
Sources, checked November 10, 2026
- github.com/davidmosiah/wellness-cycle-coach: Independent MIT server that takes period start dates and returns a cycle phase estimate; stateless, local, no outbound calls; says it is not medical advice or a fertility or contraception tool and is not affiliated with any cycle app
- help.naturalcycles.com/hc/en-us/articles/4405598610577-How-to-sync-with-Apple-Health: Natural Cycles help: you can import or export period and flow, spotting, cervical mucus, ovulation tests and sex with Apple Health, and thermometer users can export temperature; turned on under Settings, Integrations; syncs each time you open the app; iOS only, not Android
- apps.apple.com/us/app/natural-cycles/id765535549: Natural Cycles' App Store listing: connects with Apple Health to read and write health data; cleared by the FDA as birth control in the US, authorized in Canada and the UK, fertility monitoring only elsewhere
Questions
Natural Cycles MCP, in short.
No. Natural Cycles does not run an MCP server. Community servers exist, and you run them yourself.
Once the Memory.fit iPhone app is out: connect Natural Cycles there, add Memory.fit to ChatGPT as a connector, and ChatGPT reads it. Join the waitlist and we'll tell you the day it is.
No. Memory.fit is hosted: you add one address to your AI and sign in with your Memory.fit account. Nothing to install, no password of another service to paste.
Each AI gets only the permissions you allow, every change shows in the app with who made it, and you can disconnect an AI or a source at any time.
No. Memory.fit is not a contraceptive or a medical device. Natural Cycles is its own regulated app where it is cleared; Memory.fit only reads what it shares with Apple Health, and only if you allow it.
Related
More MCP pages
- What Memory.fit reads from Natural Cycles
- Memory.fit and AthleteData, side by side
- Every device's MCP page
Natural Cycles is a trademark of NaturalCycles Nordic AB. Memory.fit is not made by or affiliated with NaturalCycles Nordic AB.
Your next chapter starts with everything you've learned.
On Android now. iPhone is coming: join the waitlist and we'll email you the day Memory.fit is on the App Store.
No spam. One email when it's ready.