Buying a Japan eSIM on Klook costs more than it needs to. We put both sites' published prices side by side, plan for plan.
On 13 matching plans altesim.com came out cheaper than Klook, by 3% to 32%.
How we compared
Both columns are the prices each site published on 11 September 2026, listed in US dollars. We used each site's actual selling price, not a struck-through list price.
Every comparison uses altesim.com's full price, ignoring the 10% site-wide discount it runs one day in three — the strictest reading against ourselves.
A "matching plan" means the same number of days and the same data allowance, with per-day plans compared only against per-day plans.
A detailed comparison: How do altesim.com and Klook differ?
| Plan | altesim.com | Klook | You save |
|---|---|---|---|
| 5 days · 10GB total | US$6.82 | US$7.95 | 14% |
| 7 days · 10GB total | US$7.04 | US$8.08 | 13% |
| 10 days · 10GB total | US$7.15 | US$8.33 | 14% |
| 30 days · 10GB total | US$7.48 | US$10.13 | 26% |
| 5 days · 5GB total | US$3.71 | US$4.62 | 20% |
| 7 days · 5GB total | US$3.92 | US$4.74 | 17% |
| 10 days · 5GB total | US$4.03 | US$4.74 | 15% |
| 30 days · 5GB total | US$4.34 | US$6.41 | 32% |
| 7 days · 1GB per day | US$4.6 | US$4.74 | 3% |
| 10 days · 1GB per day | US$6.41 | US$6.79 | 6% |
| 30 days · 1GB per day | US$18.48 | US$20.38 | 9% |
| 10 days · 20GB total | US$12.79 | US$13.85 | 8% |
| 30 days · 20GB total | US$13.45 | US$16.92 | 21% |
When traveling in Japan, the choices for eSIMs are vast. We compared 13 Japanese eSIM plans from altesim.com and Klook and found that altesim.com's prices were lower than Klook's, with savings ranging from 3% to 32%. The widest gap was in the "30-day 5GB total" plan, where altesim.com charged US$4.34 while Klook charged US$6.41, a saving of 32%. For the "10GB total" plan, the 5-day option was 14% cheaper and the 30-day option was 26% cheaper. For example, the 5-day plan was US$6.82 on altesim.com and US$7.95 on Klook, while the 30-day plan was US$7.48 on altesim.com and US$10.13 on Klook. These figures show that the longer the duration, the greater the savings. If you're planning a trip to Japan, especially for an extended stay or with high data needs, altesim.com is a great choice. For instance, if you're going for 30 days, the "30-day 5GB total" plan is highly suitable as it's 32% cheaper than other platforms.
Six plans that beat Trip.com
| Plan | altesim.com | Klook | Trip.com | vs Klook | vs Trip.com |
|---|---|---|---|---|---|
| 30 days · 10GB total | US$7.48 | US$10.13 | US$8.17 | 26% | 8% |
| 5 days · 5GB total | US$3.71 | US$4.62 | US$4.51 | 20% | 18% |
| 7 days · 5GB total | US$3.92 | US$4.74 | US$4.8 | 17% | 18% |
| 10 days · 5GB total | US$4.03 | US$4.74 | US$5.07 | 15% | 21% |
| 30 days · 5GB total | US$4.34 | US$6.41 | US$5.78 | 32% | 25% |
| 30 days · 20GB total | US$13.45 | US$16.92 | US$14.77 | 21% | 9% |
These six plans are not only cheaper than Klook but also cheaper than Trip.com. The durations range from 5 days to 30 days and the capacities from 5GB to 20GB, not concentrated in any one type. The biggest saving was in the "30-day 5GB total" plan, with altesim.com at US$4.34 and Klook at US$6.41, a 32% difference.
Choosing between total and daily plans for Japan
When selecting an eSIM, total and daily plans are the two main options. Daily plans are characterized by a reduction in speed to 128kbps after the daily high-speed allowance is used up, but the connection doesn't drop, and the high speed resets the next day. For example, if you're traveling in Japan for 7 days and need 1GB of data daily, the "7-day 1GB daily" plan would be ideal as it ensures you always have enough high-speed internet.
In contrast, total plans don't require daily calculations; you can use more on days when you need more and save for days when you need less. For instance, if you're in Japan for 10 days but need a lot of data on some days, such as for tethering or streaming, the "10-day 20GB total" plan would be more suitable as it allows you to allocate data as needed.
It's important to note that if your trip is shorter or your data needs are more stable, a daily plan might be more appropriate; if your trip is longer or your data needs fluctuate more, a total plan would be a better choice.
The variety of options on altesim.com's Japan page
altesim.com's Japan page offers 218 plans, providing a wide range of choices. The durations range from 1 day to 365 days, so whether you're on a short trip or an extended stay, you can find a suitable plan. These plans are divided into total and daily options, allowing you to choose based on your needs.
In addition to plans that cover only Japan, altesim.com also offers multi-country plans that include Japan. If you're traveling to multiple countries, these multi-country plans can be very convenient.
It's worth noting that altesim.com has a total of 2,303 plans covering 84 destinations, offering a vast selection. No matter where you're traveling, altesim.com is likely to have a plan that meets your needs.
How much data do you actually need in Japan? Three itineraries to consider
The data needs for traveling in Japan vary depending on the itinerary. Here are three common itineraries with corresponding data needs:
1. Itinerary A: Accommodation with Wi-Fi, mainly using maps and communication
This type of itinerary is suitable for the "daily 1GB" plan, as generally, 1GB per day is sufficient. For example, if you're traveling in Japan for 7 days, the "7-day 1GB daily" plan would be ideal.
2. Itinerary B: Frequent use of navigation, uploading photos, and occasional video streaming
This type of itinerary is suitable for the "5GB total" plan, as generally, a week would require about 5GB to 10GB. For example, if you're traveling in Japan for 5 days, the "5-day 5GB total" plan would be ideal.
3. Itinerary C: Tethering for companions, frequent video streaming or live streaming
This type of itinerary is suitable for the "20GB total" plan, as generally, 10 days would require about 20GB. For example, if you're traveling in Japan for 10 days, the "10-day 20GB total" plan would be ideal.
It's important to note that the length of your trip will affect your data needs, so you should adjust your choice of plan according to your actual situation.
The benefits of using altesim.com
altesim.com offers several convenient services. It prices in US dollars but allows payment in local currency, making it suitable for tourists from different regions. altesim.com's Japan plans use the KDDI and SoftBank networks, support 5G, and allow tethering to share with friends, ensuring a stable network connection during your trip to Japan.
Three things to do before purchasing
Before buying an eSIM, there are three important things to do:
1. Check if your device supports eSIM
Recent iPhones, Samsung Galaxy S series, and Google Pixel phones support eSIM, but older models and some China-version devices may need special inquiry.
2. Look for a 10% discount day
altesim.com has a 10% discount across the site every 3 days, so if it's a discount day, you can save an additional 10%.
3. Reconfirm the current price on the destination page
Prices on all platforms can change at any time, so it's important to reconfirm the current price on the destination page.
In summary, altesim.com offers a wide range of choices and convenient services. Whether you have any specific needs for your trip to Japan, you're likely to find a suitable eSIM plan on altesim.com.
Prices are as published on 11 September 2026 and can change at any time; check the page on the day you buy.