Comparison

Grace Care vs Deep Sky Diary

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Grace Care

This app offers doctor-supervised femtech support for women's health. It provides accurate predictions for ovulation and menstruation, even for irregular cycles, and offers personalized advice based on user data. It also includes features for ovarian age assessment and access to expert consultations and clinic partnerships.

Highlights
  • Doctor-supervised femtech support
  • Accurate ovulation and period prediction
  • Personalized expert advice
  • Ovarian age and egg count prediction
  • Q&A with supervising doctor
  • Fertility and health information articles
  • Partnerships with fertility clinics
Features
Read full description

◇すべての女性に寄り添う、医師監修のフェムケアサポートアプリ◇ 妊娠しやすい時期、妊娠しづらい時期がひとめでわかり、これまで予測が難しかった生理不順にも対応。 一人一人の周期と妊娠希望に合わせて、入力データを元に専門医のアドバイスがもらえます。 生理、妊活、婦人科系の病気…人には相談しづらい女性のカラダの悩みをGrace Careが解決します! ◇こんな方へオススメです◇ ・生理不順で次回の生理日が分からず予定が立てられない ・妊活を始めたいけれど何からやれば良いの? ・不妊治療を続けているけれど、なかなか授かれず悩んでいる ・生理、排卵、卵管、子宮など、婦人科系の悩みがある ・冷え症やPMS、基礎体温のばらつきなど、自分の体質に不安がある ・専門家のアドバイスがほしい ◇あなたをサポートする5つの特徴◇ --------業界初!アプリで卵巣年齢(AMH値)診断-------- 日々の生理・排卵・基礎体温記録をもとに、あなたの卵巣年齢&卵子保有数を予測します。卵子の数は、妊活や女性の身体において、とても重要なキーワードです。あなたの今の卵子&卵巣の状態をチェックして、将来に向けて自分に合った計画を立ててみましょう。 ※生理周期が安定している場合、実測値に近い数字の予想が可能ですが、より正確な値を把握するために、提携クリニックでの採血による検査をお勧めします。 --------より正確な排卵・生理予測-------- 杉山産婦人科理事長の杉山力一先生の、25年にわたる不妊治療の研究実績をもとに生まれた独自ロジックで、生理&排卵日を予測します。 これまで、生理不順で先々の予定が立てられずに悩んでいた方や、排卵日がわからず妊活のタイミングがつかめなかった方、それぞれの希望にフィットした予測を実現しました。 --------先生にお悩み相談-------- 監修医である杉山先生へのQ&Aを公開中 生理のコト、妊活のコト、体調のコト… あなたの抱えているお悩みのヒントも発見できるかも! --------医師監修コラム・妊活情報-------- 妊活・生理から美容や健康の情報まで、あなたの生活にきっと役立つ情報が満載です。 --------全国の厳選生殖医療クリニックと提携-------- 生殖医療の分野で確かな実績を誇る全国の提携クリニックにおいて、婦人科や生殖医療の診療を受けることができます。アプリ内から各クリニックの予約画面にダイレクトに遷移でき、病院選びのお悩みを解決します。 ◇利用規約・プライバシーポリシー◇ https://www.eggslab.jp/#sec13 ◇お問い合わせ◇ 皆さまからの貴重なご意見・ご感想としてレビューを拝見しておりますが、すべてのレビューにお答えすることができない場合がございます。 恐れ入りますが、ご不明な点や不具合などがございましたら、下記アドレスまでお問い合わせいただきますようお願いいたします。 support@gracebank.jp

About

Deep Sky Diary

Record your thoughts and memories for your future self or send messages into the void. This app allows you to create regular diary entries, schedule future readings, or send messages that are permanently deleted.

Highlights
  • Regular diary entries
  • Scheduled future readings
  • Ephemeral black hole messages
  • Optional black hole receipt
Features
Read full description

Sometimes, you probably want to talk to your "future self", and sometimes, you probably want to just talk to nowhere. Deep Sky Diary is here for you. - Keep regular diaries - Write diaries for future you: set a date and read the diary after that day. - Write a diary and send it to the black hole (nowhere) * *: The message will be discarded and not saved on your local device. If you choose to save a receipt, a story with the title "Blackhole Receipt" will be saved.

Screenshots

Grace Care4 screens
Deep Sky Diary4 screens

Verdict

The call

The clearest difference is rating: Deep Sky Diary at 5.0 against Grace Care's 4.5. Deep Sky Diary also leads on ads (none vs shown) and update cadence (every 3 days vs every 3 months). Grace Care's advantage is ratings volume (70 vs 2). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Deep Sky Diary holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Grace Care has 70 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Grace Care ships an update every 3 months, Deep Sky Diary every 3 days. The most recent releases landed on October 17, 2026 and October 11, 2026 respectively.

Scorecard5 real differences · 5 level
Grace Care versus Deep Sky Diary: the parameters behind the verdict, then further details
ParameterGrace CareDeep Sky Diary
PriceFreeFree
Rating4.5 (70 ratings)5.0 (2 ratings) — better
Positive reviews22.0% of reviews—
Number of ratings70 — better2
Update frequencyEvery 3 monthsEvery 3 days — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.414.1 — better
Further details — not scored
Size33 MB8 MB
Age rating12+4+
DeveloperEggs Co., Ltd.Shunzhe Ma

Customer experience

Grace Care

All ratings70 ratings
Positive82.9%
Neutral12.9%
Negative4.3%
Written reviews50 reviews
Positive22.0%
Neutral16.0%
Negative62.0%

Deep Sky Diary

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Grace Care

No in-app purchases

None

Deep Sky Diary

No in-app purchases

Questions

Is Grace Care free?
Grace Care is free to download, with no in-app purchases.
Is Deep Sky Diary free?
Deep Sky Diary is free to download, with no in-app purchases.
Which has better reviews, Grace Care or Deep Sky Diary?
Deep Sky Diary is rated higher. Grace Care averages 4.5 out of 5 from 70 ratings, while Deep Sky Diary averages 5.0 from 2 ratings.
Do Grace Care or Deep Sky Diary have ads?
Grace Care shows ads; Deep Sky Diary does not.
Which is updated more often, Grace Care or Deep Sky Diary?
Grace Care ships an update every 3 months, and Deep Sky Diary every 3 days. Most recently, Grace Care was updated on October 17, 2026 and Deep Sky Diary on October 11, 2026.

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