# Travel Data Planner — Data, eSIM & roaming planner

> Data, eSIM & roaming planner (iPhone/iPad app by syoutarou ookura.)

- Source: https://appshunter.io/ios/app/travel-data-planner/id6798292861 (this page in markdown: same URL + `.md`)
- Developer: [syoutarou ookura](https://appshunter.io/developer/1614144503)
- Category: Travel, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 19 MB
- Languages: American English
- Released: 2026-08-23
- Data updated: 2026-10-15

## What is Travel Data Planner?

How much mobile data does your trip actually need? Travel Data Planner turns the way you use your phone into a number you can shop with — and then helps you get online abroad without overpaying.

DATA CALCULATOR
Pick a traveller profile or set your own hours per day for maps, social, browsing, music, video calls, streaming and laptop tethering. Set your trip length and get a GB estimate with a 30% safety buffer built in, plus the plan size to look for.

BEFORE YOU FLY
A seven-item checklist for the things that go wrong at the airport: carrier unlock, eSIM support, installing the eSIM on Wi-Fi, offline maps, roaming switched off, app data limits, and keeping calls on Wi-Fi.

GET CONNECTED
An honest side-by-side of travel eSIM, carrier day-passes, local SIM cards and pocket Wi-Fi — what each is good at and what it costs you.

TRAVEL ASSISTANT (optional, bring your own API key)
Ask follow-up questions about your specific trip. The assistant sees the estimate and checklist you just built, so its advice matches your plan. You supply your own API key for Anthropic, OpenAI, Google Gemini or any OpenAI-compatible endpoint; messages go straight from your phone to that provider. There is no subscription and no account.

ENCRYPTED BACKUP
Export everything to a passphrase-locked file using Argon2id and XChaCha20-Poly1305. The key is derived on your device and never leaves it — which also means a lost passphrase cannot be recovered by anyone, including us.

BUILT TO STAY OUT OF THE WAY
No account, no tracking, no ads. Everything except the optional assistant works fully offline. Light and dark themes, and English or Japanese.

Data estimates are broad averages, not guarantees — actual use varies by app, quality settings and network. That is exactly why the calculator adds a buffer.

## Is Travel Data Planner safe?

Not enough ratings yet to assess Travel Data Planner.

## Is Travel Data Planner legit?

Travel Data Planner appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Travel Data Planner is 70 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.1.2 — 2026-09-29

App Storeにアプリの使い方がわかるプレビュー動画を追加しました。

### 1.1.1 — 2026-09-21

広告計測の設定(SKAdNetwork)の追加と、デベロッパーサイト情報の更新を行いました。

### 1.1.0 — 2026-08-18

No release notes.

## Apps similar to Travel Data Planner

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [eSIM Agent](https://appshunter.io/ios/app/esim-agent/id6772821986) | — | Free | Travel |
| [USA E-SIM](https://appshunter.io/ios/app/usa-e-sim/id6475980863) | 1.0 (1) | Free | Travel |
| [Marino eSIM](https://appshunter.io/ios/app/marino-esim/id6759389931) | — | Free | Travel |

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All apps by syoutarou ookura: https://appshunter.io/developer/1614144503

## Related topics

[travel data planner](https://appshunter.io/ios/topics/travel-data-planner)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-15.*