Updated September 28, 2026 · NomadCue Editorial Team
Ninja WiFi vs WorldSIM
Ninja WiFi
Higher score in this comparison
WorldSIM
What sets them apart
| Compare | Ninja WiFiReviewVisitVisit | WorldSIMReviewVisitVisit |
|---|---|---|
| Data allowance | Unlimited plans sold with per-day caps 1GB-10GB (speed limited to 128kbps beyond the daily cap); Infinite plan no data limit; use over 15GB/day may suspend service | 3.6GB |
| Devices connected | 2 | 10Higher |
| Pickup and delivery | Airport counter pickup (Narita T1/T2, Haneda T2/T3, Kansai T1/T2, Naha, Fukuoka) or courier delivery to hotel/accommodation; return at counter, by courier or airport return box | Worldwide delivery, free over GBP 100 |
| Daily price | ¥440 | Not confirmed |
| Deposit | Not confirmed | £0 |
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Key differences
- Ninja WiFi scores higher overall: 9.0 vs 8.8.
- Devices connected is higher at WorldSIM: 10 vs 2.
- Support channels: only Ninja WiFi offers Phone.
- Support channels: only WorldSIM offers Chat, Email.
Our verdict on each
Ninja WiFi
Ninja WiFi suits Japan trips where you would rather carry a device than install an app, and where daily price is the main thing you weigh. Daily price runs at ¥440, plans start from ¥770, and unlimited data is on the list.
WorldSIM
WorldSIM is a UK MVNO eSIM built for travellers crossing several countries, where a global plan reaches 195 countries on established mobile networks. Plans start at £25, and 5G with instant activation make it a practical pick for multi-country trips rather than a bargain option.
Score breakdown
| Area | Ninja WiFi | WorldSIM |
|---|---|---|
| Cost | 9.7HigherDaily price sits at ¥440 from ¥770, ranking 11 of 59 brands on daily price. | 8.4Entry pricing of £25 and £1.18 a GB sits above the medians €5 and €1.50. |
| Offer | 8.2Unlimited data is listed, but 2 devices at once and support limited to phone and help centre keep the offer narrow. | 9.1HigherCoverage of 195 countries, 5G, instant activation and top-ups. |
| Trust | Not confirmed | 8.8 |
Where they rank in our lists
| Ranking | Ninja WiFi | WorldSIM |
|---|---|---|
| Travel SIMs and eSIMs | 71 of 926 | 32 of 926 |
| Travel eSIMs | 72 of 918 | 32 of 918 |
| Pocket WiFi rental | 9 of 193 | 5 of 193 |
If neither fits
TravlFi has devices connected at 10 to 128, against 2 for Ninja WiFi and 10 for WorldSIM.
TravlFi reviewWhere these facts come from
Ninja WiFi
- ninjawifi.com: 7 facts, checked September 26, 2026
WorldSIM
- worldsim.com: 8 facts, checked September 26, 2026
Every fact side by side
| Fact | Ninja WiFi | WorldSIM |
|---|---|---|
| Legal entity | Vision Inc. | WorldSIM Limited |
| Headquarters | Japan | United Kingdom |
| Founded | Not confirmed | 2006 |
| Support channels | Phone, Help centre | Chat, Email, Help centre |
eSIMs
| Fact | Ninja WiFi | WorldSIM |
|---|---|---|
| Price from | ¥770 | £25 |
| Price per GB from | Not confirmed | £1.18 |
| Countries covered | Not confirmed | 195 |
| Unlimited data | YesHas it | No |
| Region | Not confirmed | Global |
| Features | Unlimited data | 5G, Instant activation |
| Audience | Not confirmed | Short trip, Long trip |
| Reference plan prices | Japan pocket WiFi unlimited $6.70 per day 7 days | Global eSIM Pro 10GB 30 days GBP 25; 20GB 90 days GBP 35; 41GB 180 days GBP 50; 85GB 365 days GBP 100; 10GB 30-day plan covers Europe, US, Japan, Thailand, Turkey and Mexico within 195+ countries |
| 5G | Not confirmed | Yes |
| Fair use policy | Excessive use may cause reduced speed | Fair and reasonable use only; WorldSIM may review charges or suspend or terminate the service if usage exceeds the terms of the agreement |
| Networks | Not confirmed | AT&T, Rogers, Bell, Telus, Iusacell, Etisalat |
| Top-ups | Not confirmed | Yes |
| Seller type | Not confirmed | Mvno |
| 10 GB in Europe | Not confirmed | £25 |
| 10 GB in the US | Not confirmed | £25 |
| 10 GB in Japan | Not confirmed | £25 |
Where each stands against the rest
| Fact | Ninja WiFi | WorldSIM | Median |
|---|---|---|---|
| Daily price | ¥440at the median | Not confirmed | ¥440 |
| Devices connected | 2lowest quarter | 10at the median | 10 |
Median across 62 listed travel providers.
Pros and cons
Ninja WiFi
Pros
- Daily price of ¥440 keeps a short Japan trip easy to budget.
- Unlimited data is on offer, listed as the unlimited data feature, and the capped plans slow down past the daily cap.
- Pickup at airport counters or courier delivery to your hotel, with a counter, courier or airport return box for the return.
Cons
- Support runs on phone and help centre only, with no chat or email listed for questions on the ground.
- Unlimited data comes with strings: past the daily cap the speed drops, and very heavy use in a day can suspend the service, with a fair use policy that says Excessive use may cause reduced speed.
- It is built for a single market, with JP as its home country, so it does not stretch beyond Japan.
WorldSIM
Pros
- Coverage of 195 countries on a single global eSIM
- 5G and instant activation, so a plan works soon after landing
- Top-ups let you add data mid-trip without buying a new eSIM
Cons
- Unlimited data is not offered, so every plan runs on a fixed allowance such as 3.6GB
- Support runs on chat, email and help centre only, with no phone line listed
- The fair use policy lets WorldSIM review charges or suspend or terminate the service if usage goes beyond the terms of the agreement
Who each suits
Ninja WiFi
Who it suits
- You land in Japan and want a device in your bag the same day, with airport counter pickup or courier delivery to your accommodation.
- You browse, stream and map all day and want unlimited data, with a daily cap you can live inside.
- You travel solo or as a pair, since the device handles 2 devices at once.
Who should look elsewhere
- WOM Chile, listed at CLP 3,990 a day, fits a Chile trip better than a Japan-only device.
- QCell, whose roaming data packages cover 50MB to 2GB per roaming data package, suits a traveller who wants data across markets rather than one home country.
WorldSIM
Who it suits
- Travellers crossing several countries on a single itinerary
- Long-stay travellers buying larger data blocks with longer validities
- People who want a UK-based MVNO with top-up flexibility
Who should look elsewhere
- Buyers after the lowest entry price, who may prefer eSIMGo.is from $0.99
- Travellers who want the widest country list, who may prefer Zwitchy at 200 countries
- Travellers who need data in a single country, where SimToIsrael from $25 is a closer match
Current offers
WorldSIM
Current offer
Bonus
Get your eSIM FREE and up to 25% bonus credit with selected airtime purchases: 25% bonus credit
Selected airtime purchases; eSIM cost free on the GBP 60 and GBP 125 airtime tiers
Source, checked September 26, 2026
Country by country
| Country | Ninja WiFi | WorldSIM |
|---|---|---|
| Japan | Yes | No |
Questions about each
Ninja WiFi
How much does Ninja WiFi cost per day?+
Plans run at ¥440 a day, with the entry point quoted at ¥770. Unlimited data sits inside the range rather than being sold as a separate data top-up, so the daily rate carries the whole cost. Pick the plan length that matches how long you are in the country.
Is the data allowance really unlimited?+
Unlimited data is listed as available, and it shows as the unlimited data feature. The catch sits in the allowance: the capped plans reduce speed once you pass the daily cap, and use beyond a very heavy daily total may suspend the service. So read unlimited as generous rather than endless.
WorldSIM
How much does a WorldSIM eSIM cost?+
Plans start at £25, and the cheapest data works out at £1.18 a GB. The Global eSIM Pro range steps up in both data and validity, so a larger block lowers the cost per GB over a longer trip.
How many countries does a WorldSIM eSIM cover?+
A plan reaches 195 countries, and the networks behind it include AT&T, Rogers and Bell. Regional and global plans draw on established carriers, so a single eSIM can carry you across a whole itinerary.