UFOクリッカー vs Pi Clicker
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
UFOクリッカー
Become an alien and abduct humans in this deep idle clicker game. Expand your galactic empire by upgrading your UFO and unlocking new dimensions. Enjoy endless progression and challenges.
- Abduct humans as an alien
- Upgrade UFO and unlock dimensions
- Reincarnation system for exponential growth
- Challenge modes for deeper gameplay
- Achievements and upgrades
- Incremental progression
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放置ゲーム・クリッカーゲーム好き必見!宇宙人になって地球人をアブダクション(誘拐)する本格やり込み放置ゲーム。暇つぶしから本格攻略まで、銀河規模の侵略があなたを待っている。 ◆ シンプルなのに奥が深い 円盤を強化し、次元を解放し、気づけば銀河帝国。放置しているだけでも侵略は続く。でも本当の楽しさはやり込んでから。 ◆ やり込み要素たっぷり - 8つの侵略次元を解放・強化 - 転生システムで指数関数的に成長 - チャレンジモードでさらに深みへ - 実績・アップグレードが山盛り - 謎のグリッチアイテムも…? ◆ こんな人におすすめ - 放置ゲーム・クリッカーゲームが好きな人 - 暇つぶしに使える無料ゲームを探している人 - 数字がどんどん大きくなる快感が好きな人 - 宇宙・SF・宇宙人・アブダクションが好きな人 - インクリメンタルゲーム、idle gameが好きな人
Pi Clicker
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A game about digging out what comes after 3.1415... Tap to earn compute (OPS), research algorithms to automate it, and spend your OPS to decode the digits of pi (π) one at a time. Decoded digits pile up on screen, and each one makes your computation a little faster. ■ Research real algorithms Gregory–Leibniz series (1671), Machin's formula (1706), Monte Carlo (1949), FFT multiplication (1971), Chudnovsky series (1988) and more — researching real algorithms speeds up your computation. Each one comes with a short explanation, its formula, and references. ■ Pi digit tape Read back the digits you decoded as a full-screen table. ■ Recomputation Hit a wall, commission a new machine, and start over from 3.14. You keep a permanent bonus based on your deepest verified digit, so each run goes faster and deeper than the last. ■ Milestones from history Archimedes's polygons, Shanks's hand computation, ENIAC's 2,037 digits — each depth you reach decodes another piece of history. ■ Idle-friendly Computation continues while the app is closed. ・CRT terminal pixel UI (font: DotGothic16) ・28 Game Center achievements, 3 leaderboards ・English / Japanese ・No ads, no in-app purchases, no data collection
Screenshots
Verdict
The clearest difference is in-app purchases: Pi Clicker at none against UFOクリッカー's 7. Pi Clicker also leads on ads (none vs shown). UFOクリッカー's advantage is update cadence (every 4 days vs fortnightly). On price, 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. UFOクリッカー sells 7 one-off in-app purchases. Pi Clicker asks for nothing beyond the download.
UFOクリッカー ships an update every 4 days, Pi Clicker fortnightly. The most recent releases landed on October 23, 2026 and October 17, 2026 respectively.
| Parameter | UFOクリッカー | Pi Clicker |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 76.9% of reviews | — |
| Update frequency | Every 4 days — better | Fortnightly |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 18.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 14 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Masamichi Nakada | Toru Kano |
In-app purchases
UFOクリッカー
- スターターパック$1.99
- エクスプローラーパック$3.99
- サポーターパック$4.99
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- コマンダーパック$9.99
- アドミラルパック$19.99
- フラグシップパック$59.99
- マザーシップパック$99.99
Pi Clicker
No in-app purchases









