Skip to content
Back to the index

Undertow

App StoreMedical & telehealth🇺🇸

No liveness check has reached it yet; it is registered on the App Store and has been in the index since 9 Oct 2026. How this is checked

Undertow is an on-device menstrual cycle tracker that records periods, symptoms, cycle phases, and recurring difficult days. It supports adjustable cycle lengths, rolling averages for irregular cycles, calendar and cycle-ring views, tags, and optional reminders without accounts, servers, analytics, or advertising.

Inferred · not functionally tested

PaidiOS
Visit App Store

Overview

6 features

Purpose: Tracking menstrual cycles, symptoms, and recurring patterns without sending sensitive health data to servers.

Inferred · not functionally tested

Audience: people who menstruate and want private cycle tracking

Inferred · not functionally tested

Functions: scheduling

Inferred · not functionally tested

Interfaces: API: unknown · MCP: unknown · CLI: unknown · Self-hosting: unknown

Recorded constraints: pricing: paid · license: Proprietary · platforms: MOBILE · deployment: ios

Constraint provenance is unknown; confirm requirements with the publisher.

Record sources: apps.apple.com. These links do not verify the individual claims.

In the Medical & telehealth space, Undertow takes a focused approach. Inferred · not functionally tested: It focuses on tracking menstrual cycles, symptoms, and recurring patterns without sending sensitive health data to servers. Inferred · not functionally tested: Undertow is a consumer product aimed at people who menstruate and want private cycle tracking. Basis unknown · not verified: Pricing is paid, from $7. Basis unknown · not verified: It runs on iOS.

It is developed by Charlotte Franenberg (United States), and it first shipped in 2026. Inferred · not functionally tested: Key capabilities include cycle day tracking, period logging, and symptom tags.

Summary written by a language model from the project’s public pages.

Tasks: Inferred · not functionally tested

  • Cycle day tracking
  • Period logging
  • Symptom tags
  • Cycle calendar
  • Cycle ring view
  • Irregular cycle averages

Topics: Inferred · not functionally tested

Tags
menstrual-healthperiod-trackingsymptom-loggingprivacy-first

JSON profile · Text profile · Access guide

Built with & integrations

Runs on
iOS

Trust & compliance

Public signals
HTTPSStore listing found

Indexing history

1

What PulseGate has recorded for this listing

  1. Indexed9 Oct · 04:05 UTC
    Undertow: Cycle Tracker seen via Apple App Store — New Apps (RSS)
    Source: Apple App Store — New Apps (RSS) · Open

Frequently asked questions about Undertow

What does Undertow do?
Inferred · not functionally tested: Undertow focuses on tracking menstrual cycles, symptoms, and recurring patterns without sending sensitive health data to servers. It is catalogued under Medical & telehealth on PulseGate.
Who is Undertow for?
Inferred · not functionally tested: Undertow is a consumer product built for people who menstruate and want private cycle tracking.
How much does Undertow cost?
Basis unknown · not verified: Paid plans start at $7.
What platforms does Undertow run on?
Basis unknown · not verified: Undertow runs on iOS.
Is Undertow still active?
Unverified. Undertow has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to Undertow?
Similar projects tracked by PulseGate include SafeCycle, Simple., and Cycle Tracker & Period.SafeCycleSimple.Cycle Tracker & Period
Who develops Undertow?
Undertow is developed by Charlotte Franenberg, based in the United States.
How long has Undertow been around?
Undertow first shipped in 2026.

Similar projects

Closest matches by what these projects do