Battery Memo vs Oitayo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Battery Memo
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"Wait - does this remote take AA or AAA?" Battery Memo ends the guessing you do with the cover already off. Save each battery-powered thing in your home - remotes, thermometers, clocks, toys, flashlights - together with the battery it takes and a photo of it. Built for one job: opening the app and knowing, right now, before you buy, hunt, or swap. What it does - Save a device with its battery type and how many it takes (a photo is enough - the name is optional) - Open any battery to see every device in your home that uses it - Count your spares by type, and change the count with the + / - buttons right in the list - Empty types are flagged as out of stock, in color - Photograph the drawer or shelf where each battery lives, so you remember where you put it - Choose from AA, AAA, C, D, N, 9V, CR2032, CR2025, CR2016, LR44, SR44, CR123A and CR2 - or type in any battery that is not on the list - Switch between English and Japanese any time in Settings Use it when - You are heading to the store and want to know what is already in the drawer - You want the battery type before you unscrew the back of a remote or thermometer - You bought spares months ago and cannot remember where you stored them - You want the rest of the household to find the right battery without asking you Nothing to learn Saving a device is two taps: pick a photo, pick a battery. No typing required. Changing a count is one tap in the list. Long-press any card to edit or delete it. No nagging There are no replacement-date logs and no reminder notifications. This app is for the moment you want to check something, not for managing a schedule. Your data Everything you save stays on your iPhone. There is no account to create, no sign-in, no ads, and no analytics. Nothing is sent to an outside server. Photos are re-compressed when saved, so capture dates and GPS locations (Exif) are not kept. There is no cloud sync, which also means your entries do not transfer to a new phone. Pricing The app is free to download and free to use. Battery stock entries are unlimited. You can save up to 5 devices for free. Only if you want a 6th device and beyond, a single one-time purchase removes the limit. There is no monthly or yearly subscription. Reaching the limit never hides or deletes the devices you already saved - it only stops new ones. If you bought the earlier paid version, the limit is removed for you at no extra charge. Requirements iPhone only (iOS 17.0 or later)
Oitayo
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しまった場所だけを、写真で覚えておく。 「片付けたことは覚えている。でも、どこにしまったか思い出せない」 Oitayoは、そのためだけのアプリです。 ■ 使い方は3ステップ 1. しまった場所を撮る 2. 何をしまったか、名前を入れる 3. 保存する たったこれだけ。 あとから「印鑑」「通帳」と入れて検索すれば、そのときの写真がそのまま出てきます。 ■ こんなものに ・通帳、印鑑、パスポート、保険証券 ・季節の飾り、扇風機、ヒーター ・防災用品、予備の電池、電球 ・家電の取扱説明書、保証書 ・普段は使わない工具、来客用の食器 年に数回しか触らないものほど、しまった場所を忘れます。 ■ 記録は端末の中だけ 写真も、物の名前も、しまった場所も、すべてお使いのiPhoneの中にだけ保存されます。開発者を含め、誰かのサーバーへ送られることはありません。アカウント登録も不要です。広告も表示しません。 ■ 料金 無料で5件まで記録できます。それ以上は有料プランでご利用いただけます。買い切りプランなら、一度のお支払いで以降ずっとお使いいただけます。 ご利用にあたっては、以下の利用規約(Apple標準EULA)が適用されます。 https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Oitayo at every 2 days against Battery Memo's every 10 days. On price, ads, in-app purchases and device support 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
Both are free to download. Battery Memo sells 1 one-off in-app purchase and Oitayo sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
Battery Memo ships an update every 10 days, Oitayo every 2 days. The most recent releases landed on October 11, 2026 and October 14, 2026 respectively.
| Parameter | Battery Memo | Oitayo |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 10 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | YUYA SATO | 合同会社JProduct |
In-app purchases
Battery Memo
- Unlimited Devices$2.99
Oitayo
- 月額プラン$1.991 Month
- 買い切り$6.99









