BACKDOOR会員アプリ vs PairIndex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BACKDOOR会員アプリ
This is an exclusive members-only application for Amusement Casino BACKDOOR. Access special features and information as a valued member.
- Exclusive member access
- Information for Amusement Casino BACKDOOR
- Members-only features
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This is a members-only app for Amusement Casino BACKDOOR.
PairIndex
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Just how rare is your ideal partner? PairIndex is a simulator that puts dating preferences into numbers. It won't give you a "dating score" or rank anyone. It shows how rare a set of conditions really is. Enter what you're looking for, such as age, height, income, savings, education, body type, looks and lifestyle, and PairIndex estimates how many people actually match. • What share of people meet my conditions? • About 1 in how many? • Which condition narrows it down the most? • How many more candidates if I lowered the income bar a little? • How rare am I, compared with people my age? [How rare is your ideal?] See the estimated share of people who match, also shown as "about 1 in N", with a fun comparison like "as rare as winning the Powerball jackpot." [What's narrowing it down] Find out which conditions cut the candidates the most. [What if you relaxed a little?] See how many more people you'd find if you loosened one condition. "$100k+ → $75k+?" "6'0" and up → 5'10" and up?" Move a slider and the result updates instantly. [How rare are you?] Enter your own profile to see what share of people your age and sex match you or better. It's not a score of your worth, just how uncommon that combination is. [The condition gap] Compare how rare you are with how rare your ideal is. [Compatibility of views] Answer a few questions about marriage, kids and lifestyle to see how many people's views wouldn't clash with yours. This is shown separately from rarity. [Share] Share a stylish result card to X or Instagram, or save it to Photos. You choose whether your conditions appear. [Based on public statistics] Estimates use official statistics such as the U.S. Census Bureau, CDC and the Federal Reserve. Correlated conditions (like income and education) are modeled together, so results aren't simply multiplied. Japan, South Korea and Taiwan data are also available. There are no official statistics on looks, so the "top X%" you choose is used as is. [Privacy] Everything you enter stays on your device. No account needed. All results are estimates. PairIndex doesn't judge real relationships or anyone's worth. Being rare isn't the same as being attractive. Use it as a prompt to rethink what really matters to you.
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Verdict
The clearest difference is ads: BACKDOOR会員アプリ at none against PairIndex's shown. PairIndex's advantage is update cadence (every 4 days vs monthly). On price, in-app purchases, device support and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.
BACKDOOR会員アプリ ships an update monthly, PairIndex every 4 days. The most recent releases landed on October 11, 2026 and September 28, 2026 respectively.
| Parameter | BACKDOOR会員アプリ | PairIndex |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Monthly | Every 4 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 41 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | ROUNDERS, K.K. | Hiroomi Kubo |
In-app purchases
BACKDOOR会員アプリ
No in-app purchases
PairIndex
No in-app purchases









