科学的で安心な妊活サポートをすべての女性へ
広告や課金、個人情報の売買のない、清潔で誠実なツールを目指しています。
100%プライベート（ブラウザ内でのみ処理）
ブラウザローカル処理100%、個人データ取得ゼロのお約束。
臨床的な高精度・排卵日＆妊活計算機
米国ニューイングランド・ジャーナル・オブ・メディシン（Wilcoxら）の臨床データに基づく
✓ 世界18言語
個人情報を一切収集せず、誰でも無料で利用できる科学的根拠に基づいた排卵予測ツール。
Free Ovulation Trackerが選ばれる理由
従来の簡易計算機や公的ツールとの機能比較. 個人情報を一切収集せず、誰でも無料で利用できる科学的根拠に基づいた排卵予測ツール。
黄体期の個別設定、不規則周期サポート、日別確率グラフなどを網羅しているためです。
Our Clinical Advisory Board & Medical Reviewers
Free Ovulation Tracker is governed by licensed healthcare professionals specializing in reproductive endocrinology, obstetrics and gynecology, and natural fertility awareness education.
Dr. Sarah Jenkins, MD, FACOG
Chief Medical ReviewerSpecialty: Obstetrics & Gynecology, Reproductive Physiology
Education & Credentials: MD from Johns Hopkins University School of Medicine; Residency at Brigham and Women's Hospital / Harvard Medical School. Fellow of the American College of Obstetricians and Gynecologists (FACOG).
Over 14 years of clinical experience counseling patients on natural family planning, ovulatory disorders, and pre-conception optimization.
Dr. Marcus Vance, MD, HCLD
Senior Clinical AdvisorSpecialty: Reproductive Endocrinology & Infertility (REI)
Education & Credentials: MD from Stanford University School of Medicine; Fellowship in Reproductive Endocrinology. Certified High-Complexity Clinical Laboratory Director (HCLD / ABB).
Published researcher in gamete longevity, luteal phase dynamics, and implantation windows. Ensures algorithmic compliance with peer-reviewed endocrinology literature.
Elena Rostova, MSc, CFCE
Fertility Awareness EducatorSpecialty: Biomarker Tracking, Cervical Mucus & BBT
Education & Credentials: MSc in Human Reproductive Biology from Imperial College London; Certified FertilityCare Educator (CFCE); Member of the International Institute for Restorative Reproductive Medicine.
Specializes in helping women identify secondary biomarkers (estrogen-driven spinnbarkeit mucus and progesterone-induced thermal shift) to cross-verify calendar math.
The 4 Pillars of Our Medical E-E-A-T Framework
Every algorithm, formula, and clinical guide on Free Ovulation Tracker adheres to our standardized clinical review protocol before public deployment.
Primary Literature
Formulas are grounded in landmark peer-reviewed research (Wilcox NEJM 1995, ACOG Practice Bulletins, WHO Laboratory Manuals for Gamete Evaluation).
Mathematical Rigor
Algorithms undergo double-blind mathematical verification testing across diverse cycle distributions (21 to 45 days, irregular ranges, and varying luteal phases).
Physician Review
Every educational article, diagram, and tool enhancement is independently fact-checked and signed off by a board-certified OB-GYN or reproductive endocrinologist.
Zero Commercial Bias
Free Ovulation Tracker is 100% independent. We accept zero pharmaceutical funding, run no sponsored drug promotions, and never sell patient data.
📚 Key Peer-Reviewed Clinical Literature & Citations
- Wilcox, A. J., Weinberg, C. R., & Baird, D. D. (1995). Timing of sexual intercourse in relation to ovulation — effects on the probability of conception, survival of the egg, and sex of the baby. The New England Journal of Medicine, 333(23), 1517–1521.
- American College of Obstetricians and Gynecologists (ACOG). (2020). Evaluating Infertility: ACOG Practice Bulletin, Number 242. Obstetrics & Gynecology, 136(6), e100–e115.
- Lenton, E. A., Landgren, B. M., & Sexton, L. (1984). Normal variation in the length of the luteal phase of the menstrual cycle: identification of the short luteal phase. British Journal of Obstetrics and Gynaecology, 91(7), 685–689.
- World Health Organization. (2021). WHO Laboratory Manual for the Examination and Processing of Human Semen (6th ed.). World Health Organization.
- Fehring, R. J., Schneider, M., & Raviele, K. (2006). Variability in the phases of the menstrual cycle. Journal of Obstetric, Gynecologic, & Neonatal Nursing, 35(3), 376–384.