Comparison

Battery Memo vs Oitayo

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

Head to head
About

Battery Memo

Features
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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)

About

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

Battery Memo4 screens
Oitayo4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard1 real difference · 5 level
Battery Memo versus Oitayo: the parameters behind the verdict, then further details
ParameterBattery MemoOitayo
PriceFreeFree
Update frequencyEvery 10 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone
Requires iOS17.017.0
Further details — not scored
Size2 MB1 MB
Age rating4+4+
DeveloperYUYA SATO合同会社JProduct

In-app purchases

1 purchases

Battery Memo

One-time1
  • Unlimited Devices$2.99
2 purchases

Oitayo

Subscriptions1
  • 月額プラン$1.991 Month
One-time1
  • 買い切り$6.99

Questions

Is Battery Memo free?
Battery Memo is free to download, with in-app purchases available.
Is Oitayo free?
Oitayo is free to download, with in-app purchases available.
Do Battery Memo or Oitayo have ads?
Neither Battery Memo nor Oitayo shows ads.
Which is updated more often, Battery Memo or Oitayo?
Battery Memo ships an update every 10 days, and Oitayo every 2 days. Most recently, Battery Memo was updated on October 11, 2026 and Oitayo on October 14, 2026.

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