Comparison

My OpenCrab vs Receive No.1

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

My OpenCrab

Features
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OpenClaw automates your tasks. Moltbook connects AI agents. Now raise one yourself. My OpenCrab is an AI game where you raise an AI-designed crab character. Its personality and dialogue were crafted by AI — but which of 7 AI types it evolves into depends entirely on you. ■ Raise → Evolve → Graduate to the AI World Phase 1 "Bit" → Phase 2 "Core" → Phase 3 (7 unique AI character types) Logical, emotional, free-spirited — how you interact changes everything. ■ Features · TALK: enjoy AI-crafted dialogue as your crab grows · 3 mini-games to speed up growth · 7 evolution types — rare "Pyramid" for the truly dedicated · CRABBOOK: collect every crab that graduates · 6 languages (EN / JA / ZH / KO / ES / FR) In the age of AI agents — raise an AI character of your own. Which type will yours become?

About

Receive No.1

Features
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'Receive No.1' is back on iPhone, three decades later. A tennis game that ran on the PC-9801, written in N88-BASIC (a Japanese vintage 8-bit/16-bit computer's BASIC dialect from the late 80s/early 90s). One hundred lines of code, published in Microcomputer BASIC Magazine (ベーマガ) — a Japanese hobby coding magazine. Now ported to iPhone with the original logic intact. ■ Faithfully the original Physics: the original gravity model, unchanged. Arm collision detection: the same Sin/Cos lookup tables sampled at 22.5° steps. Score handling, ball-fall calculation — everything follows the original BASIC code. Because the math matches, the original behavior comes through: - Serves rise straight up from the court edge and fall back down - The angle and speed of the return are decided by the moment your arm swings through - Touch the ball three times and you lose the rally - Only the server scores points ■ The original feel, nostalgic again Sometimes the ball passes right through your arm. Sometimes you can't return the serve. That's how the math worked back then. Because the original is reproduced faithfully, those quirks come back — and now they feel nostalgic. The same 90s-era precision, running on a modern phone. ■ CPU opponent, finally possible Single-player CPU mode was hard to implement back on PC-9801. Now it's here. - Evolving CPU: a learning AI driven by 20 genes. We ship an "initial CPU" pre-trained for 1500 generations. Train your own and export it as JSON to share. - Watch mode: let CPU vs. CPU rallies play out. Some go on for many exchanges. ■ For you, if… - You once copied program listings out of Microcomputer BASIC Magazine - You played games on PC-9801, PC-8801, MSX, or X68000 - You've touched N88-BASIC - You're into 90s Japanese DIY game culture ■ Free. Ads only on AI parts. The app is fully free. Ads only appear during AI training and CPU vs. CPU watch mode. Modes where a human is playing (vs. CPU, two-player) have no ads at all. We collect no personal data. Everything stays on your device.

Screenshots

My OpenCrab4 screens
Receive No.13 screens

Verdict

The call

The clearest difference is ads: Receive No.1 at none against My OpenCrab's shown. 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference · 5 level
My OpenCrab versus Receive No.1: the parameters behind the verdict, then further details
ParameterMy OpenCrabReceive No.1
PriceFreeFree
Update frequency—Every 3 months
AdsYesNo — better
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.1
Further details — not scored
Size35 MB29 MB
Age rating12+4+
DeveloperDaichi WatanabeTatsuro Saito

In-app purchases

None

My OpenCrab

No in-app purchases

None

Receive No.1

No in-app purchases

Questions

Is My OpenCrab free?
My OpenCrab is free to download, with no in-app purchases.
Is Receive No.1 free?
Receive No.1 is free to download, with no in-app purchases.
Do My OpenCrab or Receive No.1 have ads?
My OpenCrab shows ads; Receive No.1 does not.

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